'use strict';

const fs = require('fs');
const axios = require('axios');
const Utils = require('./Utils');
const Constants = require('./Constants');

class Player {
  constructor(innertube_session) {
    this.session = innertube_session;
    this.player_name = Utils.getStringBetweenStrings(this.session.player_url, '/player/', '/');
    this.tmp_cache_dir = __dirname.slice(0, -3)+'cache';
  }
  
  async init() {
    if (fs.existsSync(this.tmp_cache_dir+'/'+this.player_name+'.js')) {
      const player_data = fs.readFileSync(this.tmp_cache_dir+'/'+this.player_name+'.js').toString();
      this.getSigDecipherCode(player_data);
    } else {
      const response = await axios.get(Constants.urls.YT_BASE_URL+this.session.player_url, { path: this.session.playerUrl, headers: { 'content-type': 'text/javascript', 'user-agent': Utils.getRandomUserAgent('desktop').userAgent } }).catch((error) => error);
      if (response instanceof Error) throw new Error ('Could not get player data: ' + response.message);
      fs.mkdirSync(this.tmp_cache_dir, { recursive: true });
      fs.writeFileSync(this.tmp_cache_dir+'/'+this.player_name+'.js', response.data);
      this.getSigDecipherCode(response.data);
    }
  }
  
  getSigDecipherCode (data) {
    const function_name = Utils.getStringBetweenStrings(data,'a.set("alr","yes");c&&(c=', '(decodeURIC');
    const func = Utils.getStringBetweenStrings(data, function_name + '=function(a)', '};') + '}';
    this.dec_func = Utils.getStringBetweenStrings(data, 'var ' + Utils.getStringBetweenStrings(data, 'a=a.split("");', '.'), '};') + ';' + func + ';';
  }
}

module.exports = Player;