const fs = require('fs');
const path = require('path');
const dbUtils = require('../utils/dbUtils');

const requestUtils = require('../utils/requestUtils');
const sleepUtils = require('../utils/sleepUtils');

async function main() {
    console.log("neteaseMusic Starting...");

    // 指定数据库
    dbUtils.create("neteaseMusic");

    // getMusicInfo({ songId: "1855221507" });
    // getMusicInfo({ songId: "1855221517" });
    // getMusicInfo({ songId: "1861632812" });

    // getArtistInfo({ artistId: "1079074" });
    // getArtistInfo({ artistId: "1079075" });

    // getAlbumInfo({ albumId: "74268047" });
    // getAlbumInfo({ albumId: "129327797" });

    // 不是所有歌手都有个人主页 例如 https://music.163.com/#/artist?id=1079075
    // getUserInfo({ userId: "37365202" });
    // getUserInfo({ userId: "29879272" });

    await startGetMusic({ songId: "1966061035" });
}

async function startGetMusic({ songId }) {
    var songInfo = await getMusicInfo({ songId: songId });

    var albumInfo = await getAlbumInfo({ albumId: songInfo.albumId });
    if (albumInfo) {
        for (var songId of albumInfo.songIds) {
            await startGetMusic({ songId: songId });
        }
    }

    for (var artistId of songInfo.artistIds) {
        var artistInfo = await getArtistInfo({ artistId: artistId });
        if (artistInfo) {
            for (var songId of artistInfo.songIds) {
                await startGetMusic({ songId: songId });
            }
        }
    }
}

// 获取音乐详情
async function getMusicInfo({ songId }) {
    console.log(`开始处理 song: ${songId}`);
    let result = await dbUtils.query('SELECT count(*) as count FROM song WHERE song_id = ?', [songId]);
    if (result[0].count > 0) {
        console.log(`数据库中已有数据，跳过 songId: ${songId}`);
        let songResult = await dbUtils.query('SELECT * FROM song WHERE song_id = ?', [songId]);
        songResult = JSON.parse(JSON.stringify(songResult));

        let songArtistResult = await dbUtils.query('SELECT * FROM song_artist_relation WHERE song_id = ?', [songId]);
        songArtistResult = JSON.parse(JSON.stringify(songArtistResult));
        songResult.artistIds = songArtistResult.map(song => song.artist_id);

        let songAlbumResult = await dbUtils.query('SELECT * FROM song_album_relation WHERE song_id = ?', [songId]);
        songAlbumResult = JSON.parse(JSON.stringify(songAlbumResult));
        songResult.albumId = songAlbumResult.map(song => song.album_id)[0];

        // console.log(songResult);
        return songResult;
    }
    await sleepUtils.sleep(500);

    let url = `https://music.163.com/song?id=${songId}`;

    try {
        throw new Error(`Error`);
        var html = fs.readFileSync(path.join(__dirname, "../temp", `song-${songId}.html`), 'utf8');
    } catch (errors) {
        var html = await requestUtils.getApiResult(url);
        fs.writeFileSync(path.join(__dirname, "../temp", `song-${songId}.html`), html);
    }
    // console.log(html);

    // 正则匹配
    let regExResult = /\<script type\=\"application\/ld\+json\"\>([\S\s]*?)\<\/script\>/.exec(html);
    let songInfoJSONString = regExResult[1];
    let songInfoDict = JSON.parse(songInfoJSONString);
    // console.log(songInfoDict);

    let title = /<meta property="og:title" content="(.*?)" \/>/.exec(html)[1];
    let image = /<meta property="og:image" content="http:\/\/p.\.music\.126\.net\/(.*?)" \/>/.exec(html)[1];
    let artist = /<meta property="og:music:artist" content="(.*?)" \/>/.exec(html)[1];
    let album = /<meta property="og:music:album" content="(.*?)"\/>/.exec(html)[1];
    let albumId = /<meta property="music:album" content="https:\/\/music\.163\.com\/album\?id=(.*?)"\/>/.exec(html)[1];
    let duration = /<meta property="music:duration" content="(.*?)"\/>/.exec(html)[1];

    const reg = /<meta property="music:musician" content="https:\/\/music\.163\.com\/artist\?id=(.*?)"\/>/g;
    let artistIds = [];
    let matched = null;
    while ((matched = reg.exec(html)) !== null) {
        artistIds.push(matched[1]);
    }

    let songInfo = {
        songId: songId,
        title: title,
        image: image,
        pubDate: songInfoDict.pubDate,
        artist: artist,
        artistIds: artistIds,
        album: album,
        albumId: albumId,
        duration: duration,
    };
    // console.log("songInfo", songInfo);
    dbUtils.query('INSERT IGNORE INTO song SET ?', {
        song_id: songInfo.songId,
        title: songInfo.title,
        image: songInfo.image,
        pub_date: songInfo.pubDate,
    });
    dbUtils.query('INSERT IGNORE INTO song_album_relation SET ?', {
        song_id: songInfo.songId,
        album_id: songInfo.albumId,
    });
    artistIds.forEach(function (artistId) {
        dbUtils.query('INSERT IGNORE INTO song_artist_relation SET ?', {
            song_id: songInfo.songId,
            artist_id: artistId,
        });
    });
    return songInfo;
}

// 获取音乐人详情
async function getArtistInfo({ artistId }) {
    console.log(`开始处理 artist: ${artistId}`);
    let result = await dbUtils.query('SELECT count(*) as count FROM artist WHERE artist_id = ?', [artistId]);
    if (result[0].count > 0) {
        console.log(`数据库中已有数据，跳过 artistId: ${artistId}`);
        // // let artistResult = await dbUtils.query('SELECT * FROM artist LEFT JOIN song_artist_relation ON artist.artist_id = song_artist_relation.artist_id WHERE artist.artist_id = ?', [artistId]);
        // let artistResult = await dbUtils.query('SELECT * FROM artist WHERE artist_id = ?', [artistId]);
        // artistResult = JSON.parse(JSON.stringify(artistResult));
        // let songArtistResult = await dbUtils.query('SELECT * FROM song_artist_relation WHERE artist_id = ?', [artistId]);
        // songArtistResult = JSON.parse(JSON.stringify(songArtistResult));
        // artistResult.songIds = songArtistResult.map(song => song.song_id);
        // // console.log(artistResult);
        // return artistResult;
        return null;
    }
    await sleepUtils.sleep(500);

    let url = `https://music.163.com/artist?id=${artistId}`;

    try {
        throw new Error(`Error`);
        var html = fs.readFileSync(path.join(__dirname, "../temp", `artist-${artistId}.html`), 'utf8');
    } catch (errors) {
        var html = await requestUtils.getApiResult(url);
        fs.writeFileSync(path.join(__dirname, "../temp", `artist-${artistId}.html`), html);
    }
    // console.log(html);

    // 正则匹配
    let regExResult = /\<script type\=\"application\/ld\+json\"\>([\S\s]*?)\<\/script\>/.exec(html);
    let artistInfoJSONString = regExResult[1];
    let artistInfoDict = JSON.parse(artistInfoJSONString);
    // console.log(artistInfoDict);

    let image = /<meta property="og:image" content="http:\/\/p.\.music\.126\.net\/(.*?)" \/>/.exec(html)[1];
    let songListJSONString = /<textarea id="song-list-pre-data" style="display:none;">(.*?)<\/textarea>/.exec(html)[1];
    let songList = JSON.parse(songListJSONString);
    let songIds = songList.map(song => song.id);

    let artistInfo = {
        artistId: artistId,
        title: artistInfoDict.title,
        image: image,
        description: artistInfoDict.description,
        pubDate: artistInfoDict.pubDate,
        songIds: songIds,
    };
    // console.log("artistInfo", artistInfo);
    dbUtils.query('INSERT IGNORE INTO artist SET ?', {
        artist_id: artistInfo.artistId,
        title: artistInfo.title,
        description: artistInfo.description,
        image: artistInfo.image,
        pub_date: artistInfo.pubDate,
    });
    songIds.forEach(function (songId) {
        dbUtils.query('INSERT IGNORE INTO song_artist_relation SET ?', {
            song_id: songId,
            artist_id: artistId,
        });
    });
    return artistInfo;
}

// 获取专辑详情
async function getAlbumInfo({ albumId }) {
    console.log(`开始处理 album: ${albumId}`);
    let result = await dbUtils.query('SELECT count(*) as count FROM album WHERE album_id = ?', [albumId]);
    if (result[0].count > 0) {
        console.log(`数据库中已有数据，跳过 albumId: ${albumId}`);
        // let albumResult = await dbUtils.query('SELECT * FROM album WHERE album_id = ?', [albumId]);
        // albumResult = JSON.parse(JSON.stringify(albumResult));
        // let songAlbumResult = await dbUtils.query('SELECT * FROM song_album_relation WHERE album_id = ?', [albumId]);
        // songAlbumResult = JSON.parse(JSON.stringify(songAlbumResult));
        // albumResult.songIds = songAlbumResult.map(song => song.song_id);
        // // console.log(albumResult);
        // return albumResult;
        return null;
    }
    await sleepUtils.sleep(500);

    let url = `https://music.163.com/album?id=${albumId}`;

    try {
        throw new Error(`Error`);
        var html = fs.readFileSync(path.join(__dirname, "../temp", `album-${albumId}.html`), 'utf8');
    } catch (errors) {
        var html = await requestUtils.getApiResult(url);
        fs.writeFileSync(path.join(__dirname, "../temp", `album-${albumId}.html`), html);
    }
    // console.log(html);

    // 正则匹配
    let regExResult = /\<script type\=\"application\/ld\+json\"\>([\S\s]*?)\<\/script\>/.exec(html);
    let albumInfoJSONString = regExResult[1];
    let albumInfoDict = JSON.parse(albumInfoJSONString);
    // console.log(albumInfoDict);

    let company = null;
    try {
        company = /<p class="intr"><b>发行公司：<\/b>\n(.*?)\n<\/p>/.exec(html)[1];
    } catch (e) {
    }

    let image = /<meta property="og:image" content="http:\/\/p.\.music\.126\.net\/(.*?)" \/>/.exec(html)[1];
    let songListJSONString = /<textarea id="song-list-pre-data" style="display:none;">(.*?)<\/textarea>/.exec(html)[1];
    let songList = JSON.parse(songListJSONString);
    let songIds = songList.map(song => song.id);

    let albumInfo = {
        albumId: albumId,
        title: albumInfoDict.title,
        image: image,
        description: albumInfoDict.description,
        pubDate: albumInfoDict.pubDate,
        company: company,
        songIds: songIds,
    };
    // console.log("albumInfo", albumInfo);
    dbUtils.query('INSERT IGNORE INTO album SET ?', {
        album_id: albumInfo.albumId,
        title: albumInfo.title,
        description: albumInfo.description,
        image: albumInfo.image,
        pub_date: albumInfo.pubDate,
        company: albumInfo.company,
    });
    songIds.forEach(function (songId) {
        dbUtils.query('INSERT IGNORE INTO song_album_relation SET ?', {
            song_id: songId,
            album_id: albumId,
        });
    });
    return albumInfo;
}

// // 获取音乐人详情
// async function getUserInfo({ userId }) {
//     let url = `https://music.163.com/user/home?id=${userId}`;

//     try {
//         var html = fs.readFileSync(path.join(__dirname, "../temp", ` user-${userId}.html`), 'utf8');
//     } catch (errors) {
//         var html = await requestUtils.getApiResult(url);
//         fs.writeFileSync(path.join(__dirname, "../temp", ` user-${userId}.html`), html);
//     }
//     // console.log(html);


// }

module.exports = {
    main: main,
}