import {
  applyDecorators,
  Controller,
  Get,
  HttpStatus,
  INestApplication,
  Logger,
  LoggerService,
} from '@nestjs/common';
import { Args, Mutation, Query, Resolver } from '@nestjs/graphql';
import {
  SubscribeMessage as RawSubscribeMessage,
  WebSocketGateway,
} from '@nestjs/websockets';
import testFn, { TestFn } from 'ava';
import Sinon from 'sinon';
import request from 'supertest';

import { Public } from '../../src/core/auth';
import {
  AccessDenied,
  GatewayErrorWrapper,
  UserFriendlyError,
} from '../../src/fundamentals';
import { createTestingApp } from '../utils';

@Public()
@Resolver(() => String)
class TestResolver {
  greating = 'hello world';

  @Query(() => String)
  hello() {
    return this.greating;
  }

  @Mutation(() => String)
  update(@Args('greating') greating: string) {
    this.greating = greating;
    return this.greating;
  }

  @Query(() => String)
  errorQuery() {
    throw new AccessDenied();
  }

  @Query(() => String)
  unknownErrorQuery() {
    throw new Error('unknown error');
  }
}

@Public()
@Controller()
class TestController {
  @Get('/ok')
  ok() {
    return 'ok';
  }

  @Get('/throw-known-error')
  throwKnownError() {
    throw new AccessDenied();
  }

  @Get('/throw-unknown-error')
  throwUnknownError() {
    throw new Error('Unknown error');
  }
}

const SubscribeMessage = (event: string) =>
  applyDecorators(GatewayErrorWrapper(event), RawSubscribeMessage(event));

@WebSocketGateway({ transports: ['websocket'], path: '/ws' })
class TestGateway {
  @SubscribeMessage('event:ok')
  async ok() {
    return {
      data: 'ok',
    };
  }

  @SubscribeMessage('event:throw-known-error')
  async throwKnownError() {
    throw new AccessDenied();
  }

  @SubscribeMessage('event:throw-unknown-error')
  async throwUnknownError() {
    throw new Error('Unknown error');
  }
}

const test = testFn as TestFn<{
  app: INestApplication;
  logger: Sinon.SinonStubbedInstance<LoggerService>;
}>;

function gql(app: INestApplication, query: string) {
  return request(app.getHttpServer())
    .post('/graphql')
    .send({ query })
    .expect(200);
}

test.beforeEach(async ({ context }) => {
  const { app } = await createTestingApp({
    providers: [TestResolver, TestGateway],
    controllers: [TestController],
  });

  context.logger = Sinon.stub(new Logger().localInstance);

  context.app = app;
});

test.afterEach.always(async ctx => {
  await ctx.context.app.close();
});

test('should be able to execute query', async t => {
  const res = await gql(t.context.app, `query { hello }`);
  t.is(res.body.data.hello, 'hello world');
});

test('should be able to handle known user error in graphql query', async t => {
  const res = await gql(t.context.app, `query { errorQuery }`);
  const err = res.body.errors[0];
  t.is(err.message, 'You do not have permission to access this resource.');
  t.is(err.extensions.status, HttpStatus.FORBIDDEN);
  t.is(err.extensions.name, 'ACCESS_DENIED');
  t.true(t.context.logger.error.notCalled);
});

test('should be able to handle unknown internal error in graphql query', async t => {
  const res = await gql(t.context.app, `query { unknownErrorQuery }`);
  const err = res.body.errors[0];
  t.is(err.message, 'An internal error occurred.');
  t.is(err.extensions.status, HttpStatus.INTERNAL_SERVER_ERROR);
  t.is(err.extensions.name, 'INTERNAL_SERVER_ERROR');
  t.true(t.context.logger.error.calledOnceWith('Internal server error'));
});

test('should be able to respond request', async t => {
  const res = await request(t.context.app.getHttpServer())
    .get('/ok')
    .expect(200);
  t.is(res.text, 'ok');
});

test('should be able to handle known user error in http request', async t => {
  const res = await request(t.context.app.getHttpServer())
    .get('/throw-known-error')
    .expect(HttpStatus.FORBIDDEN);
  t.is(res.body.message, 'You do not have permission to access this resource.');
  t.is(res.body.name, 'ACCESS_DENIED');
  t.true(t.context.logger.error.notCalled);
});

test('should be able to handle unknown internal error in http request', async t => {
  const res = await request(t.context.app.getHttpServer())
    .get('/throw-unknown-error')
    .expect(HttpStatus.INTERNAL_SERVER_ERROR);
  t.is(res.body.message, 'An internal error occurred.');
  t.is(res.body.name, 'INTERNAL_SERVER_ERROR');
  t.true(t.context.logger.error.calledOnceWith('Internal server error'));
});

// Hard to test through websocket, will call event handler directly
test('should be able to response websocket event', async t => {
  const gateway = t.context.app.get(TestGateway);

  const res = await gateway.ok();
  t.is(res.data, 'ok');
});

test('should be able to handle known user error in websocket event', async t => {
  const gateway = t.context.app.get(TestGateway);

  const { error } = (await gateway.throwKnownError()) as unknown as {
    error: UserFriendlyError;
  };
  t.is(error.message, 'You do not have permission to access this resource.');
  t.is(error.name, 'ACCESS_DENIED');
  t.true(t.context.logger.error.notCalled);
});

test('should be able to handle unknown internal error in websocket event', async t => {
  const gateway = t.context.app.get(TestGateway);

  const { error } = (await gateway.throwUnknownError()) as unknown as {
    error: UserFriendlyError;
  };
  t.is(error.message, 'An internal error occurred.');
  t.is(error.name, 'INTERNAL_SERVER_ERROR');
  t.true(t.context.logger.error.calledOnceWith('Internal server error'));
});