import { httpGET, parseTimeToSeconds, toHHMMSS } from '@squeebot/core/lib/common';
import { logger } from '@squeebot/core/lib/core';
import {
  Plugin,
  Configurable,
  EventListener,
} from '@squeebot/core/lib/plugin';
import { IMessage } from '@squeebot/core/lib/types';

import cheerio from 'cheerio';
import * as urllib from 'url';

type ActionFn = (url: urllib.URL, msg: IMessage, data?: any) => Promise<any>;

interface URLHandler {
  plugin: string;
  action: ActionFn;
}

let urlHandlers: {[key: string]: URLHandler} = {};
let htmlHandlers: any[] = [];

const urlRegex = /(((ftp|https?):\/\/)[-\w@:%_+.~#?,&//=]+)/g;

function findUrls(text: string): string[] {
  const source = (text || '').toString();
  const urlArray = [];
  let matchArray = urlRegex.exec(source);

  while (matchArray !== null) {
    urlArray.push(matchArray[0]);
    matchArray = urlRegex.exec(source);
  }

  return urlArray;
}

// https://gist.github.com/denniszhao/8972cd4ae637cf10fe01
function ytDuration(time: string): string {
  const a = time.match(/\d+H|\d+M|\d+S/g);

  let result = 0;

  const d: {[key: string]: number} = { H: 3600, M: 60, S: 1 };
  let num;
  let type;

  for (const char of a || []) {
    num = char.slice(0, char.length - 1);
    type = char.slice(char.length - 1, char.length);

    result += parseInt(num, 10) * d[type];
  }

  return toHHMMSS(result.toString());
}

async function dailymotionFromId(id: string, msg: IMessage): Promise<boolean> {
  const url = 'https://api.dailymotion.com/video/' + id + '?fields=id,title,owner,owner.screenname,duration,views_total';

  let data = await httpGET(url);

  try {
    data = JSON.parse(data);
  } catch (e) {
    return false;
  }

  const keys = [];

  keys.push(['field', 'Dailymotion', { type: 'title' }]);
  keys.push(['field', data.title, { type: 'description' }]);
  keys.push(['field', data.views_total.toString(), { label: 'Views', type: 'metric' }]);
  keys.push(['field', data.duration.toString(), { label: 'Duration', type: 'duration' }]);
  keys.push(['field', data['owner.screenname'], { label: ['By'] }]);

  msg.resolve(keys);

  return true;
}

async function getSoundcloudFromUrl(plugin: URLReplyPlugin, url: string, msg: IMessage): Promise<boolean> {
  const token = plugin.config.get('tokens.soundcloud');
  if (!token) {
    return false;
  }

  const sAPI = 'https://api.soundcloud.com/resolve?url=' + encodeURIComponent(url) + '&client_id=' + token;

  let data = await httpGET(sAPI);

  try {
    data = JSON.parse(data);
  } catch (e) {
    return false;
  }

  if (!data) {
    return false;
  }
  const keys = [];

  keys.push(['field', 'SoundCloud' + ((data.kind === 'playlist') ? ' Playlist' : ''), { type: 'title', color: 'gold' }]);
  keys.push(['field', data.title, { type: 'description' }]);

  if (data.kind === 'track') {
    keys.push(['field', data.playback_count.toString(), { color: 'green', label: ['▶', 'Plays'], type: 'metric' }]);
    keys.push(['field', data.favoritings_count.toString(), { color: 'red', label: ['♥', 'Favourites'], type: 'metric' }]);
  } else {
    keys.push(['field', data.track_count.toString(), { label: 'Tracks', type: 'metric' }]);
  }

  keys.push(['field', Math.floor(data.duration / 1000).toString(), { label: 'Duration', type: 'duration' }]);
  keys.push(['field', data.user.username, { label: ['By'] }]);

  msg.resolve(keys);

  return true;
}

async function getYoutubeFromVideo(
  plugin: URLReplyPlugin,
  id: string,
  full: urllib.URL,
  msg: IMessage): Promise<boolean> {
  const gtoken = plugin.config.get('tokens.google');

  if (!gtoken) {
    return false;
  }

  const gAPI = 'https://www.googleapis.com/youtube/v3/videos?id=' + id + '&key=' +
    gtoken + '&part=snippet,contentDetails,statistics';

  let data = await httpGET(gAPI);
  try {
    data = JSON.parse(data);
  } catch (e) {
    return false;
  }

  if (!data || !data.items || !data.items.length) {
    msg.resolve('Video does not exist or is private.');
    return false;
  }

  const dislikeAPI = `https://returnyoutubedislikeapi.com/votes?videoId=${id}`;
  let dislikeData;
  try {
    dislikeData = await httpGET(dislikeAPI);
    dislikeData = JSON.parse(dislikeData);
  } catch (e) {
    dislikeData = null;
  }

  const vid = data.items[0];
  const time = full.searchParams.get('t');
  let live = false;

  if (!vid.snippet) {
    return false;
  }

  const keys = [];

  if (vid.snippet.liveBroadcastContent === 'live') {
    live = true;
    keys.push(['field', '[LIVE]', {color: 'red'}]);
  }

  if (time) {
    let tag = parseInt(time, 10);
    if (tag != null && !isNaN(tag)) {
      if (time.indexOf('s') !== -1 || time.indexOf('m') !== -1 || time.indexOf('h') !== -1) {
        tag = parseTimeToSeconds(time);
      }
      keys.push(['field', `[${toHHMMSS(tag)}]`, {color: 'red'}]);
    }
  }

  keys.push(['field', 'You' + msg.source.format.color('brown', 'Tube'), { color: 'white', type: 'title' }]);
  keys.push(['field', vid.snippet.title, {type: 'description'}]);

  keys.push(['field', vid.statistics.viewCount.toString(), { type: 'metric', label: 'Views' }]);

  if (!live) {
    keys.push(['field', ytDuration(vid.contentDetails.duration.toString()), { label: 'Duration' }]);
  }

  let likeCount: number | null = null;
  let dislikeCount: number | null = null;
  if (vid.statistics && vid.statistics.likeCount != null) {
    likeCount = vid.statistics.likeCount;
  }

  if (dislikeData) {
    dislikeCount = dislikeData.dislikes;
    if (likeCount === null) {
      likeCount = dislikeData.likes;
    }
  }

  if (likeCount !== null) {
    keys.push(['field', likeCount, { color: 'limegreen', label: ['▲', 'Likes'], type: 'metric' }]);
  }

  if (dislikeCount !== null) {
    keys.push(['field', dislikeCount, { color: 'red', label: ['▼', 'Dislikes'], type: 'metric' }]);
  }

  keys.push(['field', vid.snippet.channelTitle, { label: ['By'] }]);

  msg.resolve(keys);

  return true;
}

@Configurable({
  tokens: {
    google: null,
    soundcloud: null
  }
})
class URLReplyPlugin extends Plugin {
  registerHandler(plugin: string, match: string, handler: ActionFn): void {
    if (!handler || typeof handler !== 'function') {
      throw new Error('Expected handler function as third argument.');
    }

    if (plugin !== 'urlreply') {
      logger.log('[urlreply] %s has added an handler for "%s"', plugin, match);
    }

    if (match.indexOf('html') === 0) {
      htmlHandlers.push([plugin, handler]);
    } else {
      urlHandlers[match] = {
        plugin, action: handler
      };
    }
  }

  resetHandlers(): void {
    urlHandlers = {};
    htmlHandlers = [];

    // YouTube
    this.registerHandler(this.name, '/watch\\?v=', async (url: urllib.URL, msg: IMessage, data: any) => {
      const det = url.searchParams.get('v');

      if (!det) {
        return false;
      }

      return getYoutubeFromVideo.apply(this, [this, det, url, msg]);
    });

    this.registerHandler(this.name, 'youtu.be/', async (url: urllib.URL, msg: IMessage, data: any)  => {
      const det = url.pathname.substring(1);

      if (!det) {
        return false;
      }

      return getYoutubeFromVideo.apply(this, [this, det, url, msg]);
    });

    // Dailymotion
    this.registerHandler(this.name, 'dailymotion.com/video/', async (url: urllib.URL, msg: IMessage, data: any)  => {
      const det = url.href.match('/video/([^?&#]*)');

      if (!det) {
        return false;
      }

      return dailymotionFromId.apply(this, [det[1], msg]);
    });

    // SoundCloud
    this.registerHandler(this.name, 'soundcloud.com/', async (url: urllib.URL, msg: IMessage, data: any)  => {
      return getSoundcloudFromUrl.apply(this, [this, url.href, msg]);
    });
  }

  @EventListener('pluginUnload')
  public unloadEventHandler(plugin: string | Plugin): void {
    if (plugin === this.name || plugin === this) {
      this.emit('pluginUnloaded', this);
    }
  }

  initialize(): void {
    this.resetHandlers();
    this.on('message', async (msg: IMessage) => {
      // Find URLS in the message
      const urls = findUrls(msg.text);
      if (!urls.length) {
        return;
      }

      const url = urls[0];
      let matched = false;

      // Find handlers matching this URL
      for (const handler in urlHandlers) {
        const obj = urlHandlers[handler];
        if (!!url.match(handler) || !obj.action) {
          try {
            const urlParsed = new urllib.URL(url);

            matched = await obj.action.apply(this, [urlParsed, msg]);
          } catch (e: any) {
            logger.error(e.stack);
            matched = false;
          }
        }

        if (matched) {
          break;
        }
      }

      // If there were no matches, pull the title of the website
      if (!matched) {
        try {
          const data = await httpGET(url, {
            Accept: 'text/html,application/xhtml+xml,application/xml'
          }, true);
          if (!data) { return; }

          const full = cheerio.load(data);
          const head = full('head');

          if (!head) { return; }

          const titleEl = head.find('title');

          if (!titleEl || !titleEl.length) { return; }
          let title = titleEl.eq(0).text();
          title = title.replace(/\n/g, ' ').trim();
          title = msg.source.format.strip(title);

          // Try HTML handlers
          let htmlHandle = false;
          for (const k in htmlHandlers) {
            const handler = htmlHandlers[k];
            if (htmlHandle) { break; }
            // Ensure handler is a function
            if (!handler[1] || typeof handler[1] !== 'function') { continue; }
            try {
              htmlHandle = await handler[1].apply(this, [url, msg, title, full]);
            } catch (e) {
              logger.error(e);
              htmlHandle = false;
            }
          }

          if (htmlHandle) { return; }
          if (title.length > 140) { title = title.substring(0, 140) + '…'; }

          msg.resolve(msg.source.format.color('purple', '[ ') + title + msg.source.format.color('purple', ' ]'));
        } catch (e) {}
      }
    });
  }

  @EventListener('pluginUnloaded')
  unloadedPlugin(plugin: string | Plugin): void {
    const id = typeof plugin === 'string' ? plugin : plugin.manifest.name;

    // Delete URL handlers for plugin
    for (const i in urlHandlers) {
      if (urlHandlers[i].plugin === id) {
        delete urlHandlers[i];
      }
    }

    // Delete HTML handlers for plugin
    const resolve = [];
    for (const i in htmlHandlers) {
      const k = htmlHandlers[i];
      if (k[0] !== id) {
        resolve.push(k);
      }
    }
    htmlHandlers = resolve;
  }
}

module.exports = URLReplyPlugin;