var Gantt = (function () {
    'use strict';

    const YEAR = 'year';
    const MONTH = 'month';
    const DAY = 'day';
    const HOUR = 'hour';
    const MINUTE = 'minute';
    const SECOND = 'second';
    const MILLISECOND = 'millisecond';

    var date_utils = {
        parse(date, date_separator = '-', time_separator = /[.:]/) {
            if (date instanceof Date) {
                return date;
            }
            if (typeof date === 'string') {
                let date_parts, time_parts;
                const parts = date.split(' ');

                date_parts = parts[0]
                    .split(date_separator)
                    .map((val) => parseInt(val, 10));
                time_parts = parts[1] && parts[1].split(time_separator);

                // month is 0 indexed
                date_parts[1] = date_parts[1] - 1;

                let vals = date_parts;

                if (time_parts && time_parts.length) {
                    if (time_parts.length == 4) {
                        time_parts[3] = '0.' + time_parts[3];
                        time_parts[3] = parseFloat(time_parts[3]) * 1000;
                    }
                    vals = vals.concat(time_parts);
                }

                return new Date(...vals);
            }
        },

        to_string(date, with_time = false) {
            if (!(date instanceof Date)) {
                throw new TypeError('Invalid argument type');
            }
            const vals = this.get_date_values(date).map((val, i) => {
                if (i === 1) {
                    // add 1 for month
                    val = val + 1;
                }

                if (i === 6) {
                    return padStart(val + '', 3, '0');
                }

                return padStart(val + '', 2, '0');
            });
            const date_string = `${vals[0]}-${vals[1]}-${vals[2]}`;
            const time_string = `${vals[3]}:${vals[4]}:${vals[5]}.${vals[6]}`;

            return date_string + (with_time ? ' ' + time_string : '');
        },

        format(date, format_string = 'YYYY-MM-DD HH:mm:ss.SSS', lang = 'ko') {
            const dateTimeFormat = new Intl.DateTimeFormat(lang, {
                month: 'long'
            });
            const month_name = dateTimeFormat.format(date);
            const month_name_capitalized =
                month_name.charAt(0).toUpperCase() + month_name.slice(1);

            const values = this.get_date_values(date).map(d => padStart(d, 2, 0));
            const format_map = {
                YYYY: values[0],
                MM: padStart(+values[1] + 1, 2, 0),
                DD: values[2],
                HH: values[3],
                mm: values[4],
                ss: values[5],
                SSS: values[6],
                D: values[2],
                MMMM: month_name_capitalized,
                MMM: month_name_capitalized,
            };

            let str = format_string;
            const formatted_values = [];

            Object.keys(format_map)
                .sort((a, b) => b.length - a.length) // big string first
                .forEach((key) => {
                    if (str.includes(key)) {
                        str = str.replace(key, `$${formatted_values.length}`);
                        formatted_values.push(format_map[key]);
                    }
                });

            formatted_values.forEach((value, i) => {
                str = str.replace(`$${i}`, value);
            });

            return str;
        },

        diff(date_a, date_b, scale = DAY) {
            let milliseconds, seconds, hours, minutes, days, months, years;

            milliseconds = date_a - date_b;
            seconds = milliseconds / 1000;
            minutes = seconds / 60;
            hours = minutes / 60;
            days = hours / 24;
            months = days / 30;
            years = months / 12;

            if (!scale.endsWith('s')) {
                scale += 's';
            }

            return Math.floor(
                {
                    milliseconds,
                    seconds,
                    minutes,
                    hours,
                    days,
                    months,
                    years,
                }[scale]
            );
        },

        today() {
            const vals = this.get_date_values(new Date()).slice(0, 3);
            return new Date(...vals);
        },

        now() {
            return new Date();
        },

        add(date, qty, scale) {
            qty = parseInt(qty, 10);
            const vals = [
                date.getFullYear() + (scale === YEAR ? qty : 0),
                date.getMonth() + (scale === MONTH ? qty : 0),
                date.getDate() + (scale === DAY ? qty : 0),
                date.getHours() + (scale === HOUR ? qty : 0),
                date.getMinutes() + (scale === MINUTE ? qty : 0),
                date.getSeconds() + (scale === SECOND ? qty : 0),
                date.getMilliseconds() + (scale === MILLISECOND ? qty : 0),
            ];
            return new Date(...vals);
        },

        start_of(date, scale) {
            const scores = {
                [YEAR]: 6,
                [MONTH]: 5,
                [DAY]: 4,
                [HOUR]: 3,
                [MINUTE]: 2,
                [SECOND]: 1,
                [MILLISECOND]: 0,
            };

            function should_reset(_scale) {
                const max_score = scores[scale];
                return scores[_scale] <= max_score;
            }

            const vals = [
                date.getFullYear(),
                should_reset(YEAR) ? 0 : date.getMonth(),
                should_reset(MONTH) ? 1 : date.getDate(),
                should_reset(DAY) ? 0 : date.getHours(),
                should_reset(HOUR) ? 0 : date.getMinutes(),
                should_reset(MINUTE) ? 0 : date.getSeconds(),
                should_reset(SECOND) ? 0 : date.getMilliseconds(),
            ];

            return new Date(...vals);
        },

        clone(date) {
            return new Date(...this.get_date_values(date));
        },

        get_date_values(date) {
            return [
                date.getFullYear(),
                date.getMonth(),
                date.getDate(),
                date.getHours(),
                date.getMinutes(),
                date.getSeconds(),
                date.getMilliseconds(),
            ];
        },

        get_days_in_month(date) {
            const no_of_days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

            const month = date.getMonth();

            if (month !== 1) {
                return no_of_days[month];
            }

            // Feb
            const year = date.getFullYear();
            if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
                return 29;
            }
            return 28;
        },
    };

    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
    function padStart(str, targetLength, padString) {
        str = str + '';
        targetLength = targetLength >> 0;
        padString = String(typeof padString !== 'undefined' ? padString : ' ');
        if (str.length > targetLength) {
            return String(str);
        } else {
            targetLength = targetLength - str.length;
            if (targetLength > padString.length) {
                padString += padString.repeat(targetLength / padString.length);
            }
            return padString.slice(0, targetLength) + String(str);
        }
    }

    function $(expr, con) {
        return typeof expr === 'string'
            ? (con || document).querySelector(expr)
            : expr || null;
    }

    function createSVG(tag, attrs) {
        const elem = document.createElementNS('http://www.w3.org/2000/svg', tag);
        for (let attr in attrs) {
            if (attr === 'append_to') {
                const parent = attrs.append_to;
                parent.appendChild(elem);
            } else if (attr === 'innerHTML') {
                elem.innerHTML = attrs.innerHTML;
            } else {
                elem.setAttribute(attr, attrs[attr]);
            }
        }
        return elem;
    }

    function animateSVG(svgElement, attr, from, to) {
        const animatedSvgElement = getAnimationElement(svgElement, attr, from, to);

        if (animatedSvgElement === svgElement) {
            // triggered 2nd time programmatically
            // trigger artificial click event
            const event = document.createEvent('HTMLEvents');
            event.initEvent('click', true, true);
            event.eventName = 'click';
            animatedSvgElement.dispatchEvent(event);
        }
    }

    function getAnimationElement(
        svgElement,
        attr,
        from,
        to,
        dur = '0.4s',
        begin = '0.1s'
    ) {
        const animEl = svgElement.querySelector('animate');
        if (animEl) {
            $.attr(animEl, {
                attributeName: attr,
                from,
                to,
                dur,
                begin: 'click + ' + begin, // artificial click
            });
            return svgElement;
        }

        const animateElement = createSVG('animate', {
            attributeName: attr,
            from,
            to,
            dur,
            begin,
            calcMode: 'spline',
            values: from + ';' + to,
            keyTimes: '0; 1',
            keySplines: cubic_bezier('ease-out'),
        });
        svgElement.appendChild(animateElement);

        return svgElement;
    }

    function cubic_bezier(name) {
        return {
            ease: '.25 .1 .25 1',
            linear: '0 0 1 1',
            'ease-in': '.42 0 1 1',
            'ease-out': '0 0 .58 1',
            'ease-in-out': '.42 0 .58 1',
        }[name];
    }

    $.on = (element, event, selector, callback) => {
        if (!callback) {
            callback = selector;
            $.bind(element, event, callback);
        } else {
            $.delegate(element, event, selector, callback);
        }
    };

    $.off = (element, event, handler) => {
        element.removeEventListener(event, handler);
    };

    $.bind = (element, event, callback) => {
        event.split(/\s+/).forEach(function (event) {
            element.addEventListener(event, callback);
        });
    };

    $.delegate = (element, event, selector, callback) => {
        element.addEventListener(event, function (e) {
            const delegatedTarget = e.target.closest(selector);
            if (delegatedTarget) {
                e.delegatedTarget = delegatedTarget;
                callback.call(this, e, delegatedTarget);
            }
        });
    };

    $.closest = (selector, element) => {
        if (!element) return null;

        if (element.matches(selector)) {
            return element;
        }

        return $.closest(selector, element.parentNode);
    };

    $.attr = (element, attr, value) => {
        if (!value && typeof attr === 'string') {
            return element.getAttribute(attr);
        }

        if (typeof attr === 'object') {
            for (let key in attr) {
                $.attr(element, key, attr[key]);
            }
            return;
        }

        element.setAttribute(attr, value);
    };

    $.style = (element, attr, value) => {
        if (!value && typeof attr === 'string') {
            return element.getAttribute(attr);
        }

        if (typeof attr === 'object') {
            for (let key in attr) {
                $.style(element, key, attr[key]);
            }
            return;
        }

        element.style[attr] = value;
    };

    class Bar {
        constructor(gantt, task) {
            this.set_defaults(gantt, task);
            this.prepare();
            this.draw();
            this.bind();
        }

        set_defaults(gantt, task) {
            this.action_completed = false;
            this.gantt = gantt;
            this.task = task;
        }

        prepare() {
            this.prepare_values();
            this.prepare_helpers();
        }

        prepare_values() {
            this.invalid = this.task.invalid;
            this.height = this.gantt.options.bar_height;
            this.x = this.compute_x();
            this.y = this.compute_y();
            this.corner_radius = this.gantt.options.bar_corner_radius;
            this.duration =
                date_utils.diff(this.task._end, this.task._start, 'hour') /
                this.gantt.options.step;
            this.width = this.gantt.options.column_width * this.duration;
            this.progress_width =
                this.gantt.options.column_width *
                    this.duration *
                    (this.task.progress / 100) || 0;
            this.group = createSVG('g', {
                class: 'bar-wrapper ' + (this.task.custom_class || ''),
                'data-id': this.task.id,
            });
            this.bar_group = createSVG('g', {
                class: 'bar-group',
                append_to: this.group,
            });
            this.handle_group = createSVG('g', {
                class: 'handle-group',
                append_to: this.group,
            });
        }

        prepare_helpers() {
            SVGElement.prototype.getX = function () {
                return +this.getAttribute('x');
            };
            SVGElement.prototype.getY = function () {
                return +this.getAttribute('y');
            };
            SVGElement.prototype.getWidth = function () {
                return +this.getAttribute('width');
            };
            SVGElement.prototype.getHeight = function () {
                return +this.getAttribute('height');
            };
            SVGElement.prototype.getEndX = function () {
                return this.getX() + this.getWidth();
            };
        }

        draw() {
            this.draw_bar();
            this.draw_progress_bar();
            this.draw_label();
            this.draw_resize_handles();
        }

        draw_bar() {
            this.$bar = createSVG('rect', {
                x: this.x,
                y: this.y,
                width: this.width,
                height: this.height,
                rx: this.corner_radius,
                ry: this.corner_radius,
                class: 'bar',
                append_to: this.bar_group,
            });

            animateSVG(this.$bar, 'width', 0, this.width);

            if (this.invalid) {
                this.$bar.classList.add('bar-invalid');
            }
        }

        draw_progress_bar() {
            if (this.invalid) return;
            this.$bar_progress = createSVG('rect', {
                x: this.x,
                y: this.y,
                width: this.progress_width,
                height: this.height,
                rx: this.corner_radius,
                ry: this.corner_radius,
                class: 'bar-progress',
                append_to: this.bar_group,
            });

            animateSVG(this.$bar_progress, 'width', 0, this.progress_width);
        }

        draw_label() {
            createSVG('text', {
                x: this.x + this.width / 2,
                y: this.y + this.height / 2,
                innerHTML: this.task.name,
                class: 'bar-label',
                append_to: this.bar_group,
            });
            // labels get BBox in the next tick
            requestAnimationFrame(() => this.update_label_position());
        }

        draw_resize_handles() {
            if (this.invalid) return;

            const bar = this.$bar;
            const handle_width = 8;

            createSVG('rect', {
                x: bar.getX() + bar.getWidth() - 9,
                y: bar.getY() + 1,
                width: handle_width,
                height: this.height - 2,
                rx: this.corner_radius,
                ry: this.corner_radius,
                class: 'handle right',
                append_to: this.handle_group,
            });

            createSVG('rect', {
                x: bar.getX() + 1,
                y: bar.getY() + 1,
                width: handle_width,
                height: this.height - 2,
                rx: this.corner_radius,
                ry: this.corner_radius,
                class: 'handle left',
                append_to: this.handle_group,
            });

            if (this.task.progress && this.task.progress < 100) {
                this.$handle_progress = createSVG('polygon', {
                    points: this.get_progress_polygon_points().join(','),
                    class: 'handle progress',
                    append_to: this.handle_group,
                });
            }
        }

        get_progress_polygon_points() {
            const bar_progress = this.$bar_progress;
            return [
                bar_progress.getEndX() - 5,
                bar_progress.getY() + bar_progress.getHeight(),
                bar_progress.getEndX() + 5,
                bar_progress.getY() + bar_progress.getHeight(),
                bar_progress.getEndX(),
                bar_progress.getY() + bar_progress.getHeight() - 8.66,
            ];
        }

        bind() {
            if (this.invalid) return;
            this.setup_click_event();
        }

        setup_click_event() {
            $.on(this.group, 'focus ' + this.gantt.options.popup_trigger, (e) => {
                if (this.action_completed) {
                    // just finished a move action, wait for a few seconds
                    return;
                }

                this.show_popup();
                this.gantt.unselect_all();
                this.group.classList.add('active');
            });

            $.on(this.group, 'dblclick', (e) => {
                if (this.action_completed) {
                    // just finished a move action, wait for a few seconds
                    return;
                }

                this.gantt.trigger_event('click', [this.task]);
            });
        }

        show_popup() {
            if (this.gantt.bar_being_dragged) return;

            const start_date = date_utils.format(
                this.task._start,
                'MMM D',
                this.gantt.options.language
            );
            const end_date = date_utils.format(
                date_utils.add(this.task._end, -1, 'second'),
                'MMM D',
                this.gantt.options.language
            );
            const subtitle = start_date + ' - ' + end_date;

            this.gantt.show_popup({
                target_element: this.$bar,
                title: this.task.name,
                subtitle: subtitle,
                task: this.task,
            });
            this.gantt.handle_selected(this.task);
        }

        update_bar_position({ x = null, width = null }) {
            const bar = this.$bar;
            if (x) {
                // // get all x values of parent task
                // const xs = this.task.dependencies.map((dep) => {
                //     return this.gantt.get_bar(dep).$bar.getX();
                // });
                // // child task must not go before parent
                // const valid_x = xs.reduce((prev, curr) => {
                //     return x >= curr;
                // }, x);
                // if (!valid_x) {
                //     width = null;
                //     return;
                // }
                this.update_attr(bar, 'x', x);
            }
            if (width && width >= this.gantt.options.column_width) {
                this.update_attr(bar, 'width', width);
            }
            this.update_label_position();
            this.update_handle_position();
            this.update_progressbar_position();
            this.update_arrow_position();
        }

        date_changed() {
            let changed = false;
            const { new_start_date, new_end_date } = this.compute_start_end_date();

            if (Number(this.task._start) !== Number(new_start_date)) {
                changed = true;
                this.task._start = new_start_date;
            }

            if (Number(this.task._end) !== Number(new_end_date)) {
                changed = true;
                this.task._end = new_end_date;
            }

            if (!changed) return;

            this.gantt.trigger_event('date_change', [
                this.task,
                new_start_date,
                date_utils.add(new_end_date, -1, 'second'),
            ]);
        }

        progress_changed() {
            const new_progress = this.compute_progress();
            this.task.progress = new_progress;
            this.gantt.trigger_event('progress_change', [this.task, new_progress]);
        }

        set_action_completed() {
            this.action_completed = true;
            setTimeout(() => (this.action_completed = false), 1000);
        }

        compute_start_end_date() {
            const bar = this.$bar;
            const x_in_units = bar.getX() / this.gantt.options.column_width;
            const new_start_date = date_utils.add(
                this.gantt.gantt_start,
                x_in_units * this.gantt.options.step,
                'hour'
            );
            const width_in_units = bar.getWidth() / this.gantt.options.column_width;
            const new_end_date = date_utils.add(
                new_start_date,
                width_in_units * this.gantt.options.step,
                'hour'
            );

            return { new_start_date, new_end_date };
        }

        compute_progress() {
            const progress =
                (this.$bar_progress.getWidth() / this.$bar.getWidth()) * 100;
            return parseInt(progress, 10);
        }

        compute_x() {
            const { step, column_width } = this.gantt.options;
            const task_start = this.task._start;
            const gantt_start = this.gantt.gantt_start;

            const diff = date_utils.diff(task_start, gantt_start, 'hour');
            let x = (diff / step) * column_width;

            if (this.gantt.view_is('Month')) {
                const diff = date_utils.diff(task_start, gantt_start, 'day');
                x = (diff * column_width) / 30;
            }
            return x;
        }

        compute_y() {
            return (
                this.gantt.options.header_height +
                this.gantt.options.padding +
                this.task._index * (this.height + this.gantt.options.padding)
            );
        }

        get_snap_position(dx) {
            let odx = dx,
                rem,
                position;

            if (this.gantt.view_is('Week')) {
                rem = dx % (this.gantt.options.column_width / 7);
                position =
                    odx -
                    rem +
                    (rem < this.gantt.options.column_width / 14
                        ? 0
                        : this.gantt.options.column_width / 7);
            } else if (this.gantt.view_is('Month')) {
                rem = dx % (this.gantt.options.column_width / 30);
                position =
                    odx -
                    rem +
                    (rem < this.gantt.options.column_width / 60
                        ? 0
                        : this.gantt.options.column_width / 30);
            } else {
                rem = dx % this.gantt.options.column_width;
                position =
                    odx -
                    rem +
                    (rem < this.gantt.options.column_width / 2
                        ? 0
                        : this.gantt.options.column_width);
            }
            return position;
        }

        update_attr(element, attr, value) {
            value = +value;
            if (!isNaN(value)) {
                element.setAttribute(attr, value);
            }
            return element;
        }

        update_progressbar_position() {
            if (this.invalid) return;
            this.$bar_progress.setAttribute('x', this.$bar.getX());
            this.$bar_progress.setAttribute(
                'width',
                this.$bar.getWidth() * (this.task.progress / 100)
            );
        }

        update_label_position() {
            const bar = this.$bar,
                label = this.group.querySelector('.bar-label');

            if (label.getBBox().width > bar.getWidth()) {
                label.classList.add('big');
                label.setAttribute('x', bar.getX() + bar.getWidth() + 5);
            } else {
                label.classList.remove('big');
                label.setAttribute('x', bar.getX() + bar.getWidth() / 2);
            }
        }

        update_handle_position() {
            if (this.invalid) return;
            const bar = this.$bar;
            this.handle_group
                .querySelector('.handle.left')
                .setAttribute('x', bar.getX() + 1);
            this.handle_group
                .querySelector('.handle.right')
                .setAttribute('x', bar.getEndX() - 9);
            const handle = this.group.querySelector('.handle.progress');
            handle &&
                handle.setAttribute('points', this.get_progress_polygon_points());
        }

        update_arrow_position() {
            this.arrows = this.arrows || [];
            for (let arrow of this.arrows) {
                arrow.update();
            }
        }
    }

    class Arrow {
        constructor(gantt, from_task, to_task) {
            this.gantt = gantt;
            this.from_task = from_task;
            this.to_task = to_task;

            this.calculate_path();
            this.draw();
        }

        calculate_path() {
            let start_x =
                this.from_task.$bar.getX() + this.from_task.$bar.getWidth() / 2;

            const condition = () =>
                this.to_task.$bar.getX() < start_x + this.gantt.options.padding &&
                start_x > this.from_task.$bar.getX() + this.gantt.options.padding;

            while (condition()) {
                start_x -= 10;
            }

            const start_y =
                this.gantt.options.header_height +
                this.gantt.options.bar_height +
                (this.gantt.options.padding + this.gantt.options.bar_height) *
                    this.from_task.task._index +
                this.gantt.options.padding;

            const end_x = this.to_task.$bar.getX() - this.gantt.options.padding / 2;
            const end_y =
                this.gantt.options.header_height +
                this.gantt.options.bar_height / 2 +
                (this.gantt.options.padding + this.gantt.options.bar_height) *
                    this.to_task.task._index +
                this.gantt.options.padding;

            const from_is_below_to =
                this.from_task.task._index > this.to_task.task._index;
            const curve = this.gantt.options.arrow_curve;
            const clockwise = from_is_below_to ? 1 : 0;
            const curve_y = from_is_below_to ? -curve : curve;
            const offset = from_is_below_to
                ? end_y + this.gantt.options.arrow_curve
                : end_y - this.gantt.options.arrow_curve;

            this.path = `
            M ${start_x} ${start_y}
            V ${offset}
            a ${curve} ${curve} 0 0 ${clockwise} ${curve} ${curve_y}
            L ${end_x} ${end_y}
            m -5 -5
            l 5 5
            l -5 5`;

            if (
                this.to_task.$bar.getX() <
                this.from_task.$bar.getX() + this.gantt.options.padding
            ) {
                const down_1 = this.gantt.options.padding / 2 - curve;
                const down_2 =
                    this.to_task.$bar.getY() +
                    this.to_task.$bar.getHeight() / 2 -
                    curve_y;
                const left = this.to_task.$bar.getX() - this.gantt.options.padding;

                this.path = `
                M ${start_x} ${start_y}
                v ${down_1}
                a ${curve} ${curve} 0 0 1 -${curve} ${curve}
                H ${left}
                a ${curve} ${curve} 0 0 ${clockwise} -${curve} ${curve_y}
                V ${down_2}
                a ${curve} ${curve} 0 0 ${clockwise} ${curve} ${curve_y}
                L ${end_x} ${end_y}
                m -5 -5
                l 5 5
                l -5 5`;
            }
        }

        draw() {
            this.element = createSVG('path', {
                d: this.path,
                'data-from': this.from_task.task.id,
                'data-to': this.to_task.task.id,
            });
        }

        update() {
            this.calculate_path();
            this.element.setAttribute('d', this.path);
        }
    }

    class Popup {
        constructor(parent, custom_html) {
            this.parent = parent;
            this.custom_html = custom_html;
            this.make();
        }

        make() {
            this.parent.innerHTML = `
            <div class="title"></div>
            <div class="subtitle"></div>
            <div class="pointer"></div>
        `;

            this.hide();

            this.title = this.parent.querySelector('.title');
            this.subtitle = this.parent.querySelector('.subtitle');
            this.pointer = this.parent.querySelector('.pointer');
        }

        show(options) {
            if (!options.target_element) {
                throw new Error('target_element is required to show popup');
            }
            if (!options.position) {
                options.position = 'left';
            }
            const target_element = options.target_element;

            if (this.custom_html) {
                let html = this.custom_html(options.task);
                html += '<div class="pointer"></div>';
                this.parent.innerHTML = html;
                this.pointer = this.parent.querySelector('.pointer');
            } else {
                // set data
                this.title.innerHTML = options.title;
                this.subtitle.innerHTML = options.subtitle;
                this.parent.style.width = this.parent.clientWidth + 'px';
            }

            // set position
            let position_meta;
            if (target_element instanceof HTMLElement) {
                position_meta = target_element.getBoundingClientRect();
            } else if (target_element instanceof SVGElement) {
                position_meta = options.target_element.getBBox();
            }

            if (options.position === 'left') {
                this.parent.style.left =
                    position_meta.x + (position_meta.width + 10) + 'px';
                this.parent.style.top = position_meta.y + 'px';

                this.pointer.style.transform = 'rotateZ(90deg)';
                this.pointer.style.left = '-7px';
                this.pointer.style.top = '2px';
            }

            // show
            this.parent.style.opacity = 1;
        }

        hide() {
            this.parent.style.opacity = 0;
            this.parent.style.left = 0;
        }
    }

    class Table {
        dragStartY = 0;
        constructor(gantt, columns) {

            console.log("[Table :: constructor]");
            console.table(gantt);
            console.table(columns);

            this.set_defaults(gantt, columns);
        }

        set_defaults(gantt, columns) {

            console.log("[Table :: set_defaults]");
            console.table(gantt);
            console.table(columns);

            this.gantt = gantt;
            this.columns = columns;
        }

        draw_table_header() {

            console.log("[Table :: draw_table_header]");

            const $thead = document.createElement('thead');
            const $tr = document.createElement('tr');

            this.columns.forEach((column) => {
                const $th = document.createElement('th');
                $th.textContent = column.title;

                $tr.appendChild($th);
            });

            $thead.appendChild($tr);
            $thead.classList.add('table-header');

            $.style($tr, 'height', this.gantt.options.header_height + 9 + 'px');

            return $thead;
        }

        get_parentNode(tag, target) {

            console.log("[Table :: get_parentNode]");
            console.table(tag);
            console.table(target);

            if (target.tagName === tag.toUpperCase()) return target;
            return this.get_parentNode(tag, target.parentNode);
        }

        draw_table_body(tasks) {

            console.log("[Table :: draw_table_body]");
            console.table(tasks);

            this.tasks = this.gantt.setGroupPosition(tasks);

            const $tbody = document.createElement('tbody');
            $tbody.classList.add('table-body');

            this.make_table_row().forEach((row) => $tbody.append(row));

            $tbody.addEventListener('mousedown', (e) => {
                const $td = this.get_parentNode('td', e.target);

                $td.classList.contains('draggable-item') &&
                    this.bind_draggable_event($tbody);
            });

            return $tbody;
        }

        isRowLine(id) {

            console.log("[Table :: isRowLine]");
            console.table(id);

            if (id <= 2) return false;
            const target = this.tasks.find((t) => t.id === `${id}`);

            return !target.groupPosition.includes('last');
        }

        make_table_row() {

            console.log("[Table :: make_table_row]");

            return this.tasks.map((task, index) => {
                const deps = task.level - 1;
                const $tr = document.createElement('tr');
                $tr.setAttribute('draggable', 'true');
                $tr.setAttribute('data-id', task.id);
                $.style($tr, {
                    height:
                        this.gantt.options.bar_height +
                        this.gantt.options.padding +
                        'px',
                });

                if (deps === 1 && task.groupPosition.includes('last')) {
                    $tr.classList.add('root-last');
                }

                this.columns.forEach((column) => {
                    const $td = document.createElement('td');
                    const { data, render } = column;

                    if (data === 'drag') {
                        $td.innerHTML = `<i class="fa fa-sort"></i>`;
                        $td.className = 'draggable-item';
                        $tr.append($td);
                        return;
                    }

                    if (data === 'wbs') {
                        $td.className = data;
                    }

                    if (data === 'name' && task.level > 1) {
                        $td.setAttribute('rel', task.type);
                        $td.className = `work-name indent-${deps} indent-${deps}-${task.groupPosition[0]}`;

                        if (task.groupPosition[1]) {
                            $td.classList.add(
                                `indent-${deps}-${task.groupPosition[1]}`
                            );
                        }

                        if (task.type !== 'default') {
                            $td.classList.add(task.closed ? 'closed' : 'opened');
                        }

                        for (let i = 0; i < deps; i++) {
                            const $ins = document.createElement('ins');
                            $ins.textContent = '';

                            this.isRowLine(task.parentId) &&
                                $ins.classList.add('row-line');

                            if (deps === 1 || i === deps - 2) {
                                $ins.classList.add('marker');

                                deps > 1 && $ins.classList.add('row-line');

                                $td.append($ins);
                                break;
                            }

                            $td.append($ins);
                        }
                    }

                    if (render) {
                        const child_node = render(task[data], task);
                        $td.append(child_node);
                    } else {
                        const text = document.createTextNode(task[data] ?? '');
                        $td.append(text);
                    }

                    $tr.append($td);
                });

                $tr.addEventListener('mousedown', (e) => {
                    const $td = this.get_parentNode('td', e.target);

                    if ($td.classList.contains('draggable-item')) {
                        $tr.addEventListener('dragstart', (e) => {
                            e.target.classList.add('dragging');
                        });

                        $tr.addEventListener('dragend', (e) => {
                            e.target.classList.remove('dragging');
                        });
                    }
                });

                return $tr;
            });
        }

        get_drag_after_element(container, y) {

            console.log("[Table :: get_drag_after_element]");
            console.table(container);
            console.table(y);

            const draggableElements = [
                ...container.querySelectorAll('tr:not(.dragging)'),
            ];

            return draggableElements.reduce(
                (closest, child) => {
                    const box = child.getBoundingClientRect();
                    const offset = y - box.top - box.height / 2;
                    if (offset < 0 && offset > closest.offset) {
                        return { offset: offset, element: child };
                    } else {
                        return closest;
                    }
                },
                { offset: Number.NEGATIVE_INFINITY }
            ).element;
        }

        find_task_item(id) {

            console.log("[Table :: find_task_item]");
            console.table(id);

            return this.tasks.find((t) => t.id === id);
        }

        bind_draggable_event($tbody) {

            console.log("[Table :: bind_draggable_event]");
            console.table($tbody);

            $tbody.addEventListener('dragover', (e) => {
                e.preventDefault();
                if (!this.dragStartY) this.dragStartY = e.clientY;

                this.draggableEl = document.querySelector('.dragging');
                this.afterElement = this.get_drag_after_element($tbody, e.clientY);

                $tbody.insertBefore(this.draggableEl, this.afterElement);
            });

            $tbody.addEventListener('drop', async (e) => {
                e.preventDefault();
                const targetItem = this.find_task_item(
                    this.get_parentNode('tr', e.target).getAttribute('data-id')
                );
                const dragItem = this.find_task_item(
                    this.draggableEl.getAttribute('data-id')
                );
                const afterItem = this.find_task_item(
                    this.afterElement.getAttribute('data-id')
                );

                const params = {
                    c_id: dragItem.id,
                    ref: afterItem.parentId,
                    c_position:
                        e.clientY > this.dragStartY
                            ? afterItem.position - 1
                            : afterItem.position,
                    level: afterItem.level,
                    p_position: dragItem.position,
                    p_parentId: dragItem.parentId,
                };

                if (targetItem.type !== 'default') {
                    const arr = this.tasks.filter(
                        (t) => t.parentId === Number(targetItem.id)
                    ).length;
                    params.ref = targetItem.id;
                    params.level = targetItem.level + 1;
                    params.c_position = arr ? arr : 0;
                }

                this.dragStartY = 0;
                this.gantt.draggble_rerender(params);
                this.gantt.trigger_event('drag_row', [params]);
            });
        }
    }

    class Split {
        constructor(wrapper) {
            this.draw_split_bar(wrapper);
        }

        draw_split_bar(elem) {
            const $split_bar = document.createElement('div');
            $split_bar.classList.add('split-bar');

            let x = 0;

            const mouseDownHandler = function (e) {
                x = e.clientX;

                document.addEventListener('mousemove', mouseMoveHandler);
                document.addEventListener('mouseup', mouseUpHandler);
            };

            const mouseMoveHandler = function (e) {
                const $table = $split_bar.previousElementSibling;
                const $gantt = $split_bar.nextSibling;

                const dx = e.clientX - x;
                const left =
                    (Math.max(
                        0,
                        Math.min($split_bar.offsetLeft + dx, elem.clientWidth)
                    ) /
                        elem.clientWidth) *
                    100;

                $.style($split_bar, { left: `${left}%` });
                $.style($table, { 'flex-basis': `${left}%` });
                $.style($gantt, { 'flex-basis': `${100 - left}%` });
                $.style($table, { 'overflow-x': 'hidden' });
                $.style($gantt, { 'overflow-x': 'hidden' });

                x = e.clientX;
            };

            const mouseUpHandler = function () {
                const $table = $split_bar.previousElementSibling;
                const $gantt = $split_bar.nextSibling;

                document.removeEventListener('mousemove', mouseMoveHandler);
                document.removeEventListener('mouseup', mouseUpHandler);

                $.style($table, { 'overflow-x': 'auto' });
                $.style($gantt, { 'overflow-x': 'auto' });
            };

            $split_bar.addEventListener('mousedown', mouseDownHandler);
            elem.prepend($split_bar);
        }
    }

    const VIEW_MODE = {
        QUARTER_DAY: 'Quarter Day',
        HALF_DAY: 'Half Day',
        DAY: 'Day',
        WEEK: 'Week',
        MONTH: 'Month',
        YEAR: 'Year',
    };

    class Gantt {
        constructor(wrapper, tasks, options, contents) {
            this.originTasks = tasks;

            this.setup_options(options);
            this.setup_tasks(tasks);

            this.setup_wrapper(wrapper);

            // initialize with default view mode
            this.change_view_mode();
            this.setup_split_bar();
            this.setup_table(contents);

            this.bind_events();
        }

        setup_wrapper(element) {
            let svg_element;
            let wrapper_element;

            // CSS Selector is passed
            if (typeof element === 'string') {
                element = document.querySelector(element);
            }

            // get the SVGElement
            if (element instanceof HTMLElement) {
                wrapper_element = element;
                svg_element = element.querySelector('svg');
            } else if (element instanceof SVGElement) {
                svg_element = element;
            } else {
                throw new TypeError(
                    'Frappé Gantt only supports usage of a string CSS selector,' +
                        " HTML DOM element or SVG DOM element for the 'element' parameter"
                );
            }

            // svg element
            if (!svg_element) {
                // create it
                this.$svg = createSVG('svg', {
                    append_to: wrapper_element,
                    class: 'gantt',
                });
            } else {
                this.$svg = svg_element;
                this.$svg.classList.add('gantt');
            }

            this.$wrapper = document.createElement('div');
            this.$wrapper.classList.add('wrapper');

            // wrapper element
            this.$container = document.createElement('div');
            this.$container.classList.add('gantt-container');

            const parent_element = this.$svg.parentElement;
            element.appendChild(this.setup_mode_handler());
            parent_element.appendChild(this.$wrapper);
            this.$wrapper.appendChild(this.$container);
            this.$container.appendChild(this.$svg);

            // popup wrapper
            this.popup_wrapper = document.createElement('div');
            this.popup_wrapper.classList.add('popup-wrapper');
            this.$container.appendChild(this.popup_wrapper);
        }

        setup_mode_handler() {
            const wrapper = document.createElement('div');
            const excel_export = document.createElement('button');
            const btn_group = document.createElement('div');

            wrapper.className = 'mt well well-sm clearfix';
            excel_export.className = 'btn btn-default btn-sm mr-xs';

            excel_export.innerText = 'Excel';

            $.style(btn_group, { float: 'right' });

            Object.keys(VIEW_MODE).forEach((key) => {
                const btn = document.createElement('button');
                btn.className = `btn btn-default btn-sm mr-xs ${
                VIEW_MODE[key] === this.options.view_mode ? 'active' : ''
            }`;
                btn.innerText = VIEW_MODE[key];
                btn.addEventListener('click', (e) => {
                    e.target.classList.add('active');
                    e.target.parentNode.childNodes.forEach((b) =>
                        b.classList.remove('active')
                    );

                    this.change_view_mode(VIEW_MODE[key]);
                });

                btn_group.appendChild(btn);
            });

            wrapper.append(excel_export);
            wrapper.append(btn_group);

            return wrapper;
        }

        setup_options(options) {
            const default_options = {
                header_height: 50,
                column_width: 30,
                step: 24,
                view_modes: [...Object.values(VIEW_MODE)],
                bar_height: 20,
                bar_corner_radius: 3,
                arrow_curve: 5,
                padding: 18,
                view_mode: 'Day',
                date_format: 'YYYY-MM-DD',
                popup_trigger: 'click',
                custom_popup_html: null,
                language: 'ko',
            };
            this.options = Object.assign({}, default_options, options);
        }

        setup_tasks(tasks) {
            // prepare tasks
            this.tasks = this.sort_tasks(tasks).map((task, i) => {
                // convert to Date objects
                task._start = date_utils.parse(task.start);
                task._end = date_utils.parse(task.end);

                // make task invalid if duration too large
                if (date_utils.diff(task._end, task._start, 'year') > 10) {
                    task.end = null;
                }

                // cache index
                task._index = i;

                // invalid dates
                if (!task.start && !task.end) {
                    const today = date_utils.today();
                    task._start = today;
                    task._end = date_utils.add(today, 2, 'day');
                }

                if (!task.start && task.end) {
                    task._start = date_utils.add(task._end, -2, 'day');
                }

                if (task.start && !task.end) {
                    task._end = date_utils.add(task._start, 2, 'day');
                }

                // if hours is not set, assume the last day is full day
                // e.g: 2018-09-09 becomes 2018-09-09 23:59:59
                const task_end_values = date_utils.get_date_values(task._end);
                if (task_end_values.slice(3).every((d) => d === 0)) {
                    task._end = date_utils.add(task._end, 24, 'hour');
                }

                // invalid flag
                if (!task.start || !task.end) {
                    task.invalid = true;
                }

                // dependencies
                if (typeof task.dependencies === 'string' || !task.dependencies) {
                    let deps = [];
                    if (task.dependencies) {
                        deps = task.dependencies
                            .split(',')
                            .map((d) => d.trim())
                            .filter((d) => d);
                    }
                    task.dependencies = deps;
                }

                // uids
                if (!task.id) {
                    task.id = generate_id(task);
                }

                return task;
            });

            this.setup_dependencies();
        }

        setup_dependencies() {
            this.dependency_map = {};
            for (let t of this.tasks) {
                for (let d of t.dependencies) {
                    this.dependency_map[d] = this.dependency_map[d] || [];
                    this.dependency_map[d].push(t.id);
                }
            }
        }

        refresh(tasks) {
            this.setup_tasks(tasks);
            this.change_view_mode();
            this.rerender_table();
            this.originTasks = tasks;
        }

        change_view_mode(mode = this.options.view_mode) {
            this.update_view_scale(mode);
            this.setup_dates();
            this.render();
            // fire viewmode_change event
            this.trigger_event('view_change', [mode]);
        }

        update_view_scale(view_mode) {
            this.options.view_mode = view_mode;

            if (view_mode === VIEW_MODE.DAY) {
                this.options.step = 24;
                this.options.column_width = 38;
            } else if (view_mode === VIEW_MODE.HALF_DAY) {
                this.options.step = 24 / 2;
                this.options.column_width = 38;
            } else if (view_mode === VIEW_MODE.QUARTER_DAY) {
                this.options.step = 24 / 4;
                this.options.column_width = 38;
            } else if (view_mode === VIEW_MODE.WEEK) {
                this.options.step = 24 * 7;
                this.options.column_width = 140;
            } else if (view_mode === VIEW_MODE.MONTH) {
                this.options.step = 24 * 30;
                this.options.column_width = 120;
            } else if (view_mode === VIEW_MODE.YEAR) {
                this.options.step = 24 * 365;
                this.options.column_width = 120;
            }
        }

        setup_dates() {
            this.setup_gantt_dates();
            this.setup_date_values();
        }

        setup_gantt_dates() {
            this.gantt_start = this.gantt_end = null;

            for (let task of this.tasks) {
                // set global start and end date
                if (!this.gantt_start || task._start < this.gantt_start) {
                    this.gantt_start = task._start;
                }
                if (!this.gantt_end || task._end > this.gantt_end) {
                    this.gantt_end = task._end;
                }
            }

            this.gantt_start = date_utils.start_of(this.gantt_start, 'day');
            this.gantt_end = date_utils.start_of(this.gantt_end, 'day');

            // add date padding on both sides
            if (this.view_is([VIEW_MODE.QUARTER_DAY, VIEW_MODE.HALF_DAY])) {
                this.gantt_start = date_utils.add(this.gantt_start, -7, 'day');
                this.gantt_end = date_utils.add(this.gantt_end, 7, 'day');
            } else if (this.view_is(VIEW_MODE.MONTH)) {
                this.gantt_start = date_utils.start_of(this.gantt_start, 'year');
                this.gantt_end = date_utils.add(this.gantt_end, 1, 'year');
            } else if (this.view_is(VIEW_MODE.YEAR)) {
                this.gantt_start = date_utils.add(this.gantt_start, -2, 'year');
                this.gantt_end = date_utils.add(this.gantt_end, 2, 'year');
            } else {
                this.gantt_start = date_utils.add(this.gantt_start, -1, 'month');
                this.gantt_end = date_utils.add(this.gantt_end, 1, 'month');
            }
        }

        setup_date_values() {
            this.dates = [];
            let cur_date = null;

            while (cur_date === null || cur_date < this.gantt_end) {
                if (!cur_date) {
                    cur_date = date_utils.clone(this.gantt_start);
                } else {
                    if (this.view_is(VIEW_MODE.YEAR)) {
                        cur_date = date_utils.add(cur_date, 1, 'year');
                    } else if (this.view_is(VIEW_MODE.MONTH)) {
                        cur_date = date_utils.add(cur_date, 1, 'month');
                    } else {
                        cur_date = date_utils.add(
                            cur_date,
                            this.options.step,
                            'hour'
                        );
                    }
                }
                this.dates.push(cur_date);
            }
        }

        bind_events() {
            this.bind_grid_click();
            this.bind_bar_events();
            this.bind_scroll_event();
        }

        render() {
            this.clear();
            this.setup_layers();
            this.make_grid();
            this.make_grid_header();
            this.make_dates();
            this.make_bars();
            this.make_arrows();
            this.map_arrows_on_bars();
            this.set_width();
            this.set_scroll_position();
        }

        rerender_table() {
            document.querySelector('.table-body')?.remove();

            const $table_body = this.table.draw_table_body(this.tasks, {
                height: this.options.bar_height + this.options.padding + 'px',
            });

            document
                .querySelector('.table-container table')
                .appendChild($table_body);

            $table_body.addEventListener('click', (event) =>
                this.bind_table_event(event)
            );
        }

        draggble_rerender(item) {
            this.update_origin_tasks(item);
            this.render();
            this.rerender_table();
        }

        sort_tasks(tasks) {
            const sorted_tasks = [...tasks];
            const children_idx_info = {};

            sorted_tasks
                .sort((a, b) => a.level - b.level || a.position - b.position)
                .forEach((task, taskIdx) => {
                    if (task.parentId !== 2) {
                        if (children_idx_info.hasOwnProperty(task.parentId)) {
                            children_idx_info[task.parentId].push(taskIdx);
                        } else {
                            children_idx_info[task.parentId] = [taskIdx];
                        }

                        const parentIdx = sorted_tasks.findIndex(
                            (item) => +item.id === task.parentId
                        );

                        sorted_tasks.splice(taskIdx, 1);
                        sorted_tasks.splice(
                            parentIdx + children_idx_info[task.parentId].length,
                            0,
                            task
                        );
                    }
                }, []);

            return sorted_tasks;
        }

        setGroupPosition(data) {
            return data.reduce((acc, cur) => {
                const group = data.filter((t) => t.parentId === cur.parentId);

                cur.groupPosition = [];

                if (group[0].id === cur.id) {
                    cur.groupPosition.push('first');
                }
                if (group[group.length - 1].id === cur.id) {
                    cur.groupPosition.push('last');
                }
                if (!cur.groupPosition.length) {
                    cur.groupPosition.push('middle');
                }

                acc.push(cur);
                return acc;
            }, []);
        }

        update_dependecies(id) {
            if (id === 2) return [];

            const dependencies = this.tasks.find(
                (task) => task.id === id
            ).dependencies;

            if (!dependencies.length) return [id];
            return [...dependencies, id];
        }

        update_origin_tasks(item) {
            let tasks = this.tasks.reduce((acc, cur) => {
                if (cur.id === item.c_id) {
                    const dependencies = this.update_dependecies(item.ref);

                    cur = {
                        ...cur,
                        parentId: Number(item.ref),
                        dependencies,
                        position: item.c_position,
                        level: item.level,
                        wbs: dependencies.length
                            ? `${dependencies.join('-')}-${item.c_id}`
                            : `${item.c_id}`,
                    };
                } else {
                    if (
                        cur.parentId === Number(item.ref) &&
                        item.c_position === item.p_position
                    ) {
                        acc.push(cur);
                        return acc;
                    }

                    if (cur.parentId === Number(item.ref)) {
                        cur.position =
                            item.c_position > item.p_position
                                ? cur.position < item.p_position
                                    ? cur.position
                                    : cur.position <= item.c_position
                                    ? cur.position - 1
                                    : cur.position
                                : cur.position > item.p_position
                                ? cur.position
                                : cur.position >= item.c_position
                                ? cur.position + 1
                                : cur.position;
                    } else {
                        if (cur.parentId === item.p_parentId) {
                            cur.position =
                                cur.position < item.p_position
                                    ? cur.position
                                    : cur.position - 1;
                        }
                    }
                }

                acc.push(cur);
                return acc;
            }, []);

            tasks = this.setGroupPosition(tasks);

            this.setup_tasks(tasks);
            this.originTasks = tasks;
        }

        setup_layers() {
            this.layers = {};
            const layers = [
                'grid',
                'arrow',
                'progress',
                'bar',
                'details',
                'header',
                'date',
            ];
            // make group layers
            for (let layer of layers) {
                this.layers[layer] = createSVG('g', {
                    class: layer,
                    append_to: this.$svg,
                });
            }
        }

        setup_split_bar() {
            this.split = new Split(this.$wrapper);
        }

        setup_table(contents, handler) {
            this.table = new Table(this, contents, handler);
            this.make_table();
        }

        bind_table_event(event) {
            const $tr = event.target.closest('tr');
            const id = $tr.dataset.id;

            if (
                event.target.tagName !== 'INS' &&
                !event.target.classList.contains('marker')
            ) {
                const task = this.get_task(id);

                this.handle_selected(task);

                return;
            }

            const $target = event.target.closest('td');

            if (
                $target.getAttribute('rel') === 'folder' ||
                $target.getAttribute('rel') === 'drive'
            ) {
                let tasks = [...this.tasks];

                if ($target.classList.contains('closed')) {
                    this.originTasks.forEach((task) => {
                        if (task.id === id) {
                            delete task.closed;
                            return tasks.splice(task._index, 1, task);
                        }

                        if (task.dependencies.includes(id))
                            tasks.splice(task._index, 0, task);
                    });
                } else {
                    tasks = this.tasks.reduce((acc, task) => {
                        if (task.id === id) {
                            return [...acc, { ...task, closed: true }];
                        }

                        if (!task.dependencies.includes(id)) {
                            return [...acc, task];
                        }

                        return acc;
                    }, []);
                }

                this.setup_tasks(tasks);
                this.render();
                this.rerender_table();
            }
        }

        make_table() {
            const $table_container = document.createElement('div');
            const $table = document.createElement('table');

            $table_container.className = 'table-container';

            const $table_header = this.table.draw_table_header();
            const $table_body = this.table.draw_table_body(this.tasks);

            $table.append($table_header);
            $table.append($table_body);

            $table_body.addEventListener('click', (event) =>
                this.bind_table_event(event)
            );

            $table_container.append($table);

            this.$wrapper.prepend($table_container);
        }

        make_grid() {
            this.make_grid_background();
            this.make_grid_rows();
            this.make_grid_ticks();
            this.make_grid_highlights();
        }

        handle_selected(task) {
            const $tr = this.$wrapper.querySelectorAll('tr')[task._index + 1];
            const $grid_row =
                this.$wrapper.querySelectorAll('.grid-row')[task._index];

            if (!$tr.classList.contains('selected')) {
                Array.prototype.forEach.call(
                    this.$wrapper.querySelectorAll('.selected'),
                    (elem) => elem.classList.remove('selected')
                );
            }

            $tr?.classList.toggle('selected');
            $grid_row?.classList.toggle('selected');
        }

        make_grid_background() {
            const grid_width = this.dates.length * this.options.column_width;
            const grid_height =
                this.options.header_height +
                this.options.padding +
                (this.options.bar_height + this.options.padding) *
                    this.tasks.length;

            createSVG('rect', {
                x: 0,
                y: 0,
                width: grid_width,
                height: grid_height,
                class: 'grid-background',
                append_to: this.layers.grid,
            });

            $.attr(this.$svg, {
                height: grid_height,
                width: '100%',
            });
        }

        make_grid_rows() {
            const rows_layer = createSVG('g', { append_to: this.layers.grid });
            // const lines_layer = createSVG('g', { append_to: this.layers.grid });

            const row_width = this.dates.length * this.options.column_width;
            const row_height = this.options.bar_height + this.options.padding;

            let row_y = this.options.header_height + this.options.padding / 2;

            for (let task of this.tasks) {
                createSVG('rect', {
                    x: 0,
                    y: row_y,
                    width: row_width,
                    height: row_height,
                    class: 'grid-row',
                    append_to: rows_layer,
                });

                // createSVG('line', {
                //     x1: 0,
                //     y1: row_y + row_height,
                //     x2: row_width,
                //     y2: row_y + row_height,
                //     class: 'row-line',
                //     append_to: lines_layer,
                // });

                row_y += this.options.bar_height + this.options.padding;
            }
        }

        make_grid_header() {
            const header_width = this.dates.length * this.options.column_width;
            const header_height = this.options.header_height + 10;

            const pageScroll = window.scrollY;
            const originOffset =
                pageScroll + this.$wrapper.getBoundingClientRect().top;

            if (originOffset <= pageScroll) {
                this.layers.header.style.transform = `translate(0px, ${Math.floor(
                window.scrollY - originOffset
            )}px)`;
            }

            createSVG('rect', {
                x: 0,
                y: 0,
                width: header_width,
                height: header_height,
                class: 'grid-header',
                append_to: this.layers.header,
            });
        }

        make_grid_ticks() {
            let tick_x = 0;
            let tick_y = this.options.header_height + this.options.padding / 2;
            let tick_height =
                (this.options.bar_height + this.options.padding) *
                this.tasks.length;

            for (let date of this.dates) {
                let tick_class = 'tick';
                // thick tick for monday
                if (this.view_is(VIEW_MODE.DAY) && date.getDate() === 1) {
                    tick_class += ' thick';
                }
                // thick tick for first week
                if (
                    this.view_is(VIEW_MODE.WEEK) &&
                    date.getDate() >= 1 &&
                    date.getDate() < 8
                ) {
                    tick_class += ' thick';
                }
                // thick ticks for quarters
                if (this.view_is(VIEW_MODE.MONTH) && date.getMonth() % 3 === 0) {
                    tick_class += ' thick';
                }

                createSVG('path', {
                    d: `M ${tick_x} ${tick_y} v ${tick_height}`,
                    class: tick_class,
                    append_to: this.layers.grid,
                });

                if (this.view_is(VIEW_MODE.MONTH)) {
                    tick_x +=
                        (date_utils.get_days_in_month(date) *
                            this.options.column_width) /
                        30;
                } else {
                    tick_x += this.options.column_width;
                }
            }
        }

        make_grid_highlights() {
            // highlight today's date
            if (this.view_is(VIEW_MODE.DAY)) {
                const x =
                    (date_utils.diff(date_utils.today(), this.gantt_start, 'hour') /
                        this.options.step) *
                    this.options.column_width;
                const y = 0;

                const width = this.options.column_width;
                const height =
                    (this.options.bar_height + this.options.padding) *
                        this.tasks.length +
                    this.options.header_height +
                    this.options.padding / 2;

                createSVG('rect', {
                    x,
                    y,
                    width,
                    height,
                    class: 'today-highlight',
                    append_to: this.layers.grid,
                });
            }
        }

        make_dates() {
            const pageScroll = window.scrollY;
            const originOffset =
                pageScroll + this.$wrapper.getBoundingClientRect().top;

            if (originOffset <= pageScroll) {
                this.layers.date.style.transform = `translate(0px, ${Math.floor(
                window.scrollY - originOffset
            )}px)`;
            }

            for (let date of this.get_dates_to_draw()) {
                createSVG('text', {
                    x: date.lower_x,
                    y: date.lower_y,
                    innerHTML: date.lower_text,
                    class: 'lower-text',
                    append_to: this.layers.date,
                });

                if (date.upper_text) {
                    const $upper_text = createSVG('text', {
                        x: date.upper_x,
                        y: date.upper_y,
                        innerHTML: date.upper_text,
                        class: 'upper-text',
                        append_to: this.layers.date,
                    });

                    // remove out-of-bound dates
                    if (
                        $upper_text.getBBox().x2 > this.layers.grid.getBBox().width
                    ) {
                        $upper_text.remove();
                    }
                }
            }
        }

        get_dates_to_draw() {
            let last_date = null;
            const dates = this.dates.map((date, i) => {
                const d = this.get_date_info(date, last_date, i);
                last_date = date;
                return d;
            });
            return dates;
        }

        get_date_info(date, last_date, i) {
            if (!last_date) {
                last_date = date_utils.add(date, 1, 'year');
            }
            const date_text = {
                'Quarter Day_lower': date_utils.format(
                    date,
                    'HH',
                    this.options.language
                ),
                'Half Day_lower': date_utils.format(
                    date,
                    'HH',
                    this.options.language
                ),
                Day_lower:
                    date.getDate() !== last_date.getDate()
                        ? date_utils.format(date, 'D', this.options.language)
                        : '',
                Week_lower:
                    date.getMonth() !== last_date.getMonth()
                        ? date_utils.format(date, 'D MMM', this.options.language)
                        : date_utils.format(date, 'D', this.options.language),
                Month_lower: date_utils.format(date, 'MMMM', this.options.language),
                Year_lower: date_utils.format(date, 'YYYY', this.options.language),
                'Quarter Day_upper':
                    date.getDate() !== last_date.getDate()
                        ? date_utils.format(date, 'D MMM', this.options.language)
                        : '',
                'Half Day_upper':
                    date.getDate() !== last_date.getDate()
                        ? date.getMonth() !== last_date.getMonth()
                            ? date_utils.format(
                                  date,
                                  'D MMM',
                                  this.options.language
                              )
                            : date_utils.format(date, 'D', this.options.language)
                        : '',
                Day_upper:
                    date.getMonth() !== last_date.getMonth()
                        ? date_utils.format(date, 'MMMM', this.options.language)
                        : '',
                Week_upper:
                    date.getMonth() !== last_date.getMonth()
                        ? date_utils.format(date, 'MMMM', this.options.language)
                        : '',
                Month_upper:
                    date.getFullYear() !== last_date.getFullYear()
                        ? date_utils.format(date, 'YYYY', this.options.language)
                        : '',
                Year_upper:
                    date.getFullYear() !== last_date.getFullYear()
                        ? date_utils.format(date, 'YYYY', this.options.language)
                        : '',
            };

            const base_pos = {
                x: i * this.options.column_width,
                lower_y: this.options.header_height,
                upper_y: this.options.header_height - 25,
            };

            const x_pos = {
                'Quarter Day_lower': (this.options.column_width * 4) / 2,
                'Quarter Day_upper': 0,
                'Half Day_lower': (this.options.column_width * 2) / 2,
                'Half Day_upper': 0,
                Day_lower: this.options.column_width / 2,
                Day_upper: (this.options.column_width * 30) / 2,
                Week_lower: 0,
                Week_upper: (this.options.column_width * 4) / 2,
                Month_lower: this.options.column_width / 2,
                Month_upper: (this.options.column_width * 12) / 2,
                Year_lower: this.options.column_width / 2,
                Year_upper: (this.options.column_width * 30) / 2,
            };

            return {
                upper_text: date_text[`${this.options.view_mode}_upper`],
                lower_text: date_text[`${this.options.view_mode}_lower`],
                upper_x: base_pos.x + x_pos[`${this.options.view_mode}_upper`],
                upper_y: base_pos.upper_y,
                lower_x: base_pos.x + x_pos[`${this.options.view_mode}_lower`],
                lower_y: base_pos.lower_y,
            };
        }

        make_bars() {
            this.bars = this.tasks.map((task) => {
                const bar = new Bar(this, task);
                this.layers.bar.appendChild(bar.group);
                return bar;
            });
        }

        make_arrows() {
            this.arrows = [];
            for (let task of this.tasks) {
                let arrows = [];
                arrows = task.dependencies
                    .map((task_id) => {
                        const dependency = this.get_task(task_id);
                        if (!dependency) return;
                        const arrow = new Arrow(
                            this,
                            this.bars[dependency._index], // from_task
                            this.bars[task._index] // to_task
                        );
                        this.layers.arrow.appendChild(arrow.element);
                        return arrow;
                    })
                    .filter(Boolean); // filter falsy values
                this.arrows = this.arrows.concat(arrows);
            }
        }

        map_arrows_on_bars() {
            for (let bar of this.bars) {
                bar.arrows = this.arrows.filter((arrow) => {
                    return (
                        arrow.from_task.task.id === bar.task.id ||
                        arrow.to_task.task.id === bar.task.id
                    );
                });
            }
        }

        set_width() {
            const cur_width = this.$svg.getBoundingClientRect().width;
            const actual_width = this.$svg
                .querySelector('.grid .grid-row')
                .getAttribute('width');
            if (cur_width < actual_width) {
                this.$svg.setAttribute('width', actual_width);
            }
        }

        set_scroll_position() {
            const parent_element = this.$svg.parentElement;
            if (!parent_element) return;

            const hours_before_first_task = date_utils.diff(
                this.get_oldest_starting_date(),
                this.gantt_start,
                'hour'
            );

            const scroll_pos =
                (hours_before_first_task / this.options.step) *
                    this.options.column_width -
                this.options.column_width;

            parent_element.scrollLeft = scroll_pos;
        }

        bind_scroll_event() {
            const originOffset =
                window.scrollY + this.$wrapper.getBoundingClientRect().top;
            const $table_header = $('.table-header');
            let ticking = false;

            $.bind(
                window,
                'scroll',
                () => {
                    const pageScroll = window.scrollY;

                    if (ticking) return;

                    ticking = true;
                    window.requestAnimationFrame(() => {
                        if (originOffset <= pageScroll) {
                            $table_header.style.top = `${Math.floor(
                            pageScroll - originOffset
                        )}px`;
                            this.layers.header.style.transform = `translate(0px, ${Math.floor(
                            pageScroll - originOffset
                        )}px)`;
                            this.layers.date.style.transform = `translate(0px, ${Math.floor(
                            pageScroll - originOffset
                        )}px)`;
                        } else {
                            $table_header.style.top = '0px';
                            this.layers.header.style.transform =
                                'translate(0px, 0px)';
                            this.layers.date.style.transform =
                                'translate(0px, 0px)';
                        }

                        ticking = false;
                    });
                },
                { passive: true }
            );
        }

        bind_grid_click() {
            $.on(
                this.$svg,
                this.options.popup_trigger,
                '.grid-row, .grid-header',
                () => {
                    this.unselect_all();
                    this.hide_popup();
                }
            );
        }

        bind_bar_events() {
            let is_dragging = false;
            let x_on_start = 0;
            let y_on_start = 0;
            let is_resizing_left = false;
            let is_resizing_right = false;
            let parent_bar_id = null;
            let bars = []; // instanceof Bar
            this.bar_being_dragged = null;

            function action_in_progress() {
                return is_dragging || is_resizing_left || is_resizing_right;
            }

            $.on(this.$svg, 'mousedown', '.bar-wrapper, .handle', (e, element) => {

                console.log ( "[gantt-0.6.1 :: mousedown]");

                const bar_wrapper = $.closest('.bar-wrapper', element);

                if (element.classList.contains('left')) {
                    is_resizing_left = true;
                } else if (element.classList.contains('right')) {
                    is_resizing_right = true;
                } else if (element.classList.contains('bar-wrapper')) {
                    is_dragging = true;
                }

                bar_wrapper.classList.add('active');

                x_on_start = e.offsetX;
                y_on_start = e.offsetY;

                parent_bar_id = bar_wrapper.getAttribute('data-id');
                // const ids = [
                //     parent_bar_id,
                //     ...this.get_all_dependent_tasks(parent_bar_id),
                // ];
                const ids = [
                    parent_bar_id
                ];
                bars = ids.map((id) => this.get_bar(id));

                this.bar_being_dragged = parent_bar_id;

                bars.forEach((bar) => {
                    const $bar = bar.$bar;
                    $bar.ox = $bar.getX();
                    $bar.oy = $bar.getY();
                    $bar.owidth = $bar.getWidth();
                    $bar.finaldx = 0;
                });
            });

            $.on(this.$svg, 'mousemove', (e) => {

                console.log ( "[gantt-0.6.1 :: mousemove]");

                if (!action_in_progress()) return;
                const dx = e.offsetX - x_on_start;
                e.offsetY - y_on_start;

                bars.forEach((bar) => {
                    const $bar = bar.$bar;
                    $bar.finaldx = this.get_snap_position(dx);
                    this.hide_popup();
                    if (is_resizing_left) {
                        if (parent_bar_id === bar.task.id) {
                            bar.update_bar_position({
                                x: $bar.ox + $bar.finaldx,
                                width: $bar.owidth - $bar.finaldx,
                            });
                        } else {
                            bar.update_bar_position({
                                x: $bar.ox + $bar.finaldx,
                            });
                        }
                    } else if (is_resizing_right) {
                        if (parent_bar_id === bar.task.id) {
                            bar.update_bar_position({
                                width: $bar.owidth + $bar.finaldx,
                            });
                        }
                    } else if (is_dragging) {
                        bar.update_bar_position({ x: $bar.ox + $bar.finaldx });
                    }
                });
            });

            document.addEventListener('mouseup', (e) => {
                if (is_dragging || is_resizing_left || is_resizing_right) {
                    bars.forEach((bar) => bar.group.classList.remove('active'));
                }

                is_dragging = false;
                is_resizing_left = false;
                is_resizing_right = false;
            });

            $.on(this.$svg, 'mouseup', (e) => {
                this.bar_being_dragged = null;
                bars.forEach((bar) => {
                    const $bar = bar.$bar;
                    if (!$bar.finaldx) return;
                    bar.date_changed();
                    bar.set_action_completed();
                });
            });

            this.bind_bar_progress();
        }

        bind_bar_progress() {
            let x_on_start = 0;
            let y_on_start = 0;
            let is_resizing = null;
            let bar = null;
            let $bar_progress = null;
            let $bar = null;

            $.on(this.$svg, 'mousedown', '.handle.progress', (e, handle) => {
                is_resizing = true;
                x_on_start = e.offsetX;
                y_on_start = e.offsetY;

                const $bar_wrapper = $.closest('.bar-wrapper', handle);
                const id = $bar_wrapper.getAttribute('data-id');
                bar = this.get_bar(id);

                $bar_progress = bar.$bar_progress;
                $bar = bar.$bar;

                $bar_progress.finaldx = 0;
                $bar_progress.owidth = $bar_progress.getWidth();
                $bar_progress.min_dx = -$bar_progress.getWidth();
                $bar_progress.max_dx = $bar.getWidth() - $bar_progress.getWidth();
            });

            $.on(this.$svg, 'mousemove', (e) => {
                if (!is_resizing) return;
                let dx = e.offsetX - x_on_start;
                e.offsetY - y_on_start;

                if (dx > $bar_progress.max_dx) {
                    dx = $bar_progress.max_dx;
                }
                if (dx < $bar_progress.min_dx) {
                    dx = $bar_progress.min_dx;
                }

                const $handle = bar.$handle_progress;
                $.attr($bar_progress, 'width', $bar_progress.owidth + dx);
                $.attr($handle, 'points', bar.get_progress_polygon_points());
                $bar_progress.finaldx = dx;
            });

            $.on(this.$svg, 'mouseup', () => {
                is_resizing = false;
                if (!($bar_progress && $bar_progress.finaldx)) return;
                bar.progress_changed();
                bar.set_action_completed();
            });
        }

        get_all_dependent_tasks(task_id) {
            let out = [];
            let to_process = [task_id];
            while (to_process.length) {
                const deps = to_process.reduce((acc, curr) => {
                    acc = acc.concat(this.dependency_map[curr]);
                    return acc;
                }, []);

                out = out.concat(deps);
                to_process = deps.filter((d) => !to_process.includes(d));
            }

            return out.filter(Boolean);
        }

        get_snap_position(dx) {
            let odx = dx,
                rem,
                position;

            if (this.view_is(VIEW_MODE.WEEK)) {
                rem = dx % (this.options.column_width / 7);
                position =
                    odx -
                    rem +
                    (rem < this.options.column_width / 14
                        ? 0
                        : this.options.column_width / 7);
            } else if (this.view_is(VIEW_MODE.MONTH)) {
                rem = dx % (this.options.column_width / 30);
                position =
                    odx -
                    rem +
                    (rem < this.options.column_width / 60
                        ? 0
                        : this.options.column_width / 30);
            } else {
                rem = dx % this.options.column_width;
                position =
                    odx -
                    rem +
                    (rem < this.options.column_width / 2
                        ? 0
                        : this.options.column_width);
            }
            return position;
        }

        unselect_all() {
            [...this.$svg.querySelectorAll('.bar-wrapper')].forEach((el) => {
                el.classList.remove('active');
            });
        }

        view_is(modes) {
            if (typeof modes === 'string') {
                return this.options.view_mode === modes;
            }

            if (Array.isArray(modes)) {
                return modes.some((mode) => this.options.view_mode === mode);
            }

            return false;
        }

        get_task(id) {
            return this.tasks.find((task) => {
                return task.id === id;
            });
        }

        get_bar(id) {
            return this.bars.find((bar) => {
                return bar.task.id === id;
            });
        }

        show_popup(options) {
            if (!this.popup) {
                this.popup = new Popup(
                    this.popup_wrapper,
                    this.options.custom_popup_html
                );
            }
            this.popup.show(options);
        }

        hide_popup() {
            this.popup && this.popup.hide();
        }

        trigger_event(event, args) {
            if (this.options['on_' + event]) {
                this.options['on_' + event].apply(null, args);
            }
        }

        /**
         * Gets the oldest starting date from the list of tasks
         *
         * @returns Date
         * @memberof Gantt
         */
        get_oldest_starting_date() {
            return this.tasks
                .map((task) => task._start)
                .reduce((prev_date, cur_date) =>
                    cur_date <= prev_date ? cur_date : prev_date
                );
        }

        /**
         * Clear all elements from the parent svg element
         *
         * @memberof Gantt
         */
        clear() {
            this.$svg.innerHTML = '';
        }
    }

    Gantt.VIEW_MODE = VIEW_MODE;

    function generate_id(task) {
        return task.name + '_' + Math.random().toString(36).slice(2, 12);
    }

    return Gantt;

})();
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