/**
 * Poke is a Free/Libre youtube front-end !
 *
 * This file is Licensed under LGPL-3.0-or-later. Poketube itself is GPL, Only this file is LGPL.
 * See a copy here: https://www.gnu.org/licenses/lgpl-3.0.txt
 * Please don't remove this comment while sharing this code.
 */

const { toJson } = require("xml2json");
const { curly } = require("node-libcurl");
const getdislikes = require("../libpoketube/libpoketube-dislikes.js");
const getColors = require("get-image-colors");
const config = require("../../config.json");
const { Innertube, UniversalCache } = require("youtubei.js");

/**
 * Class representing PokeTube's core functionality.
 */
class InnerTubePokeVidious {
  /**
   * Create an instance of InnerTubePokeVidious.
   * @param {object} config - Configuration object for InnerTubePokeVidious.
   * @param {string} config.tubeApi - Tube API URL.
   * @param {string} config.invapi - Invid API URL.
   * @param {string} config.invapi_alt - Invid API URL - ALT .
   * @param {string} config.dislikes - Dislikes API URL.
   * @param {string} config.t_url - Matomo URL.
   */
  constructor(config) {
    this.config = config;
    this.cache = {};
    this.language = "hl=en-US";
    this.apikey = "AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8";
    this.INNERTUBE_CONTEXT_CLIENT_VERSION = "1";
    this.region = "region=US";
    this.sqp =
      "-oaymwEbCKgBEF5IVfKriqkDDggBFQAAiEIYAXABwAEG&rs=AOn4CLBy_x4UUHLNDZtJtH0PXeQGoRFTgw";
  }

  /**
   * Fetch JSON from API response.
   * @param {string} str - String response from the API.
   * @returns {object|null} Parsed JSON object or null if parsing failed.
   */
  getJson(str) {
    try {
      return JSON.parse(str);
    } catch {
      return null;
    }
  }

  /**
   * Check if the provided object has the required properties.
   * @param {object} obj - Object to check.
   * @returns {boolean} True if the object has the required properties, false otherwise.
   */
  checkUnexistingObject(obj) {
    if (obj) {
      if ("authorId" in obj) {
        return true;
      }
    }
  }

  /**
   * Fetch video information.
   * @param {string} v - Video ID.
   * @returns {Promise<object>} Promise resolving to the video information.
   */
  async getYouTubeApiVideo(f, v, contentlang, contentregion) {
    /**
     * Fetch data from the specified URL with the given headers, retrying if status code is 500.
     * @param {string} url - The URL to fetch data from.
     * @param {Object} headers - The headers to include in the fetch request.
     * @returns {Promise<string>} A promise that resolves to the text content of the response.
     */
    async function fetchData(url, headers) {
      /**
       * @type {Response}
       */
      const response = await fetch(url, { headers });

      if (response.status === 500) {
        // If status is 500, fetch again
        console.log("Retrying due to status 500...");
        return fetchData(url, headers);
      }

      return response.text();
    }

    const { fetch } = await import("undici");
    const yt = await Innertube.create({
      cache: new UniversalCache(false),
      generate_session_locally: true,
    });

    if (v == null) return "Gib ID";

    // Check if result is already cached
    if (this.cache[v] && Date.now() - this.cache[v].timestamp < 3600000) {
      return this.cache[v].result;
    }
    const headers = {};

    let desc = "";

    try {
      const [videoInfo, videoData] = await Promise.all([
        fetchData(`${this.config.invapi}/videos/${v}?hl=${contentlang}&region=${contentregion}&h=${btoa(Date.now())}`),
        curly
          .get(`${this.config.tubeApi}video?v=${v}`, {
            httpHeader: Object.entries(headers).map(([k, v]) => `${k}: ${v}`),
          })
          .then((res) => {
            const json = toJson(res.data);
            const video = this.getJson(json);
            return { json, video };
          }),
      ]);

      const comments = await yt.getComments(v);

      const vid = await this.getJson(videoInfo);
      const { json, video } = videoData;

      var channel_uploads = {};
      if (f == "true") {
        channel_uploads = await fetch(
          `${this.config.invapi}/channels/${vid.authorId}?hl=${contentlang}&region=${contentregion}`
        );
        var p = this.getJson(await channel_uploads.text());
      }

      if (!vid) {
        console.log(
          `Sorry nya, we couldn't find any information about that video qwq`
        );
      }

      if (this.checkUnexistingObject(vid)) {
        const fe = await getdislikes(v);

        try {
          const headers = {};

          // Store result in cache
          this.cache[v] = {
            result: {
              json: json?.video,
              video,
              vid,
              comments,
              channel_uploads: p,
              engagement: fe.engagement,
              wiki: "",
              desc: "",
              color: await getColors(
                `https://vid.puffyan.us/vi/${v}/hqdefault.jpg?sqp=${this.sqp}`
              ).then((colors) => colors[0].hex()),
              color2: await getColors(
                `https://vid.puffyan.us/vi/${v}/hqdefault.jpg?sqp=${this.sqp}`
              ).then((colors) => colors[1].hex()),
            },
            timestamp: Date.now(),
          };

          return this.cache[v].result;
        } catch (error) {
          this.initError("Error getting video", error);
        }
      }
    } catch {}
  }

  /**
   * Check if a video ID is valid.
   * @param {string} v - Video ID.
   * @returns {boolean} True if the video ID is valid, false otherwise.
   */
  isvalidvideo(v) {
    if (v != "assets" && v != "cdn-cgi" && v != "404") {
      return true;
    } else {
      return false;
    }
  }

  /**
   * Initialize an error.
   * @param {string} args - Error message.
   * @param {Error} error - Error object.
   */
  initError(args, error) {
    console.error("[LIBPT CORE ERROR]" + args, error);
  }
}

// Create an instance of InnerTubePokeVidious with the provided config
const pokeTubeApiCore = new InnerTubePokeVidious({
  tubeApi: "https://inner-api.poketube.fun/api/",
  invapi: "https://invid-api.poketube.fun/api/v1",
  invapi_alt:
    config.proxylocation === "EU"
      ? "https://invid-api.poketube.fun/api/v1"
      : "https://iv.ggtyler.dev/api/v1",
  dislikes: "https://returnyoutubedislikeapi.com/votes?videoId=",
  t_url: "https://t.poketube.fun/",
});

module.exports = pokeTubeApiCore;