import 'reflect-metadata';

import { cpSync } from 'node:fs';
import { join, parse } from 'node:path';
import { fileURLToPath, pathToFileURL } from 'node:url';

import { config } from 'dotenv';

import {
  applyEnvToConfig,
  getAFFiNEConfigModifier,
} from './fundamentals/config';
import { enablePlugin } from './plugins';

const PROJECT_CONFIG_PATH = join(fileURLToPath(import.meta.url), '../config');
async function loadRemote(remoteDir: string, file: string) {
  let fileToLoad = join(PROJECT_CONFIG_PATH, file);

  if (PROJECT_CONFIG_PATH !== remoteDir) {
    const remoteFile = join(remoteDir, file);
    const remoteFileAtLocal = join(
      PROJECT_CONFIG_PATH,
      parse(file).name + '.remote.js'
    );
    cpSync(remoteFile, remoteFileAtLocal, {
      force: true,
    });
    fileToLoad = remoteFileAtLocal;
  }

  await import(pathToFileURL(fileToLoad).href);
}

async function load() {
  const AFFiNE_CONFIG_PATH =
    process.env.AFFINE_CONFIG_PATH ?? PROJECT_CONFIG_PATH;
  // Initializing AFFiNE config
  //
  // 1. load dotenv file to `process.env`
  // load `.env` under pwd
  config();
  // load `.env` under user config folder
  config({
    path: join(AFFiNE_CONFIG_PATH, '.env'),
  });

  // 2. generate AFFiNE default config and assign to `globalThis.AFFiNE`
  globalThis.AFFiNE = getAFFiNEConfigModifier();
  globalThis.AFFiNE.use = enablePlugin;
  globalThis.AFFiNE.plugins.use = enablePlugin;

  // TODO(@forehalo):
  //   Modules may contribute to ENV_MAP, figure out a good way to involve them instead of hardcoding in `./config/affine.env`
  // 3. load env => config map to `globalThis.AFFiNE.ENV_MAP
  // load local env map as well in case there are new env added
  await loadRemote(PROJECT_CONFIG_PATH, 'affine.env.js');
  const projectEnvMap = AFFiNE.ENV_MAP;
  await loadRemote(AFFiNE_CONFIG_PATH, 'affine.env.js');
  const customEnvMap = AFFiNE.ENV_MAP;
  AFFiNE.ENV_MAP = { ...projectEnvMap, ...customEnvMap };

  // 4. load `config/affine` to patch custom configs
  // load local config as well in case there are new default configurations added
  await loadRemote(PROJECT_CONFIG_PATH, 'affine.js');
  await loadRemote(AFFiNE_CONFIG_PATH, 'affine.js');

  // 5. load `config/affine.self` to patch custom configs
  // This is the file only take effect in [AFFiNE Cloud]
  if (!AFFiNE.isSelfhosted) {
    await loadRemote(PROJECT_CONFIG_PATH, 'affine.self.js');
  }

  // 6. apply `process.env` map overriding to `globalThis.AFFiNE`
  applyEnvToConfig(globalThis.AFFiNE);
}

await load();