const fs = require('fs');
const path = require('path');
const dbUtils = require(global.useMysqlPool ? '../utils/dbPoolUtils' : '../utils/dbUtils');

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

dbUtils.create({
    database: "neteaseMusic",   // 指定数据库
    connectionLimit: 8,         // 设置数据库连接池数量
});
global.dbUtils = dbUtils;

const songInfoUtils = require('./src/getInfo/songInfoUtils');
const artistInfoUtils = require('./src/getInfo/artistInfoUtils');
const albumInfoUtils = require('./src/getInfo/albumInfoUtils');

console.log("global.useMysqlPool:", !!global.useMysqlPool);

// 退出检查
async function checkIsExit() {
    if (fs.readFileSync('stop.txt') != "1")
        return;
    console.log();
    console.log(`收到退出指令，准备退出...`);
    await sleepUtils.sleep(500);
    await dbUtils.close();
    console.log(`数据库连接池已关闭`);
    await sleepUtils.sleep(100);
    process.exit(0);
}

async function test() {
    console.log("neteaseMusic test...");

    let songIds = (await dbUtils.query(`
        SELECT DISTINCT song_id FROM song_lyric WHERE song_id NOT IN ( SELECT DISTINCT song_id FROM song )
    `, [])).map(song => song.song_id);

    for (let songId of songIds) {
        var url = `https://music.163.com/api/song/lyric?id=${songId}&lv=1`;
        var json = await requestUtils.getApiResult(url);
        var lyric = JSON.parse(json).lrc;
        console.log(lyric);
    }
    // fs.writeFileSync(path.join(__dirname, "../../temp", `album-${albumId}.html`), html);
}


async function main() {
    console.log("neteaseMusic Starting...");
    console.log(`数据统计: ${await statistics()}`);

    // getMusicInfo({ songId: "1855221507" });
    // getArtistInfo({ artistId: "1079074" });
    // getAlbumInfo({ albumId: "74268047" });

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

    while (true) {
        // 删除脏数据
        var affectRows1 = await dbUtils.query(`DELETE FROM song_artist_relation WHERE song_id = 0 OR artist_id = 0`, []);
        var affectRows2 = await dbUtils.query(`DELETE FROM song_album_relation WHERE song_id = 0 OR album_id = 0`, []);
        console.log(`删除脏数据 affectRows:`, affectRows1.affectedRows, affectRows2.affectedRows);

        await startGet(1);
        await sleepUtils.sleep(2000);
    }
}

async function startGet(sleepTime) {
    // 从数据库中查出还缺少的歌曲，并进行爬取
    console.log("start fetching songs ...");
    let songIds = await dbUtils.query(`
        SELECT DISTINCT song_id FROM song_artist_relation WHERE song_id NOT IN ( SELECT DISTINCT song_id FROM song )
        UNION
        SELECT DISTINCT song_id FROM song_album_relation WHERE song_id NOT IN ( SELECT DISTINCT song_id FROM song )
    `, []);
    songIds = songIds.map(item => item.song_id);
    for (let i = 0; i < songIds.length; i++) {
        await checkIsExit();
        const songId = songIds[i];
        console.log(`${i}/${songIds.length} | song: ${songId} | ${await statistics()}`);
        try {
            await songInfoUtils.fetch({ songId: songId });
        } catch (err) {
            console.error(err);
        }
        await sleepUtils.sleep(sleepTime);
    }

    // 从数据库中查出还缺少的专辑，并进行爬取
    console.log("start fetching albums ...")
    let albumIds = await dbUtils.query(`
        SELECT DISTINCT album_id FROM song_album_relation WHERE album_id NOT IN ( SELECT DISTINCT album_id FROM album )
    `, []);
    albumIds = albumIds.map(item => item.album_id);
    for (let i = 0; i < albumIds.length; i++) {
        await checkIsExit();
        const albumId = albumIds[i];
        console.log(`${i}/${albumIds.length} | album: ${albumId} | ${await statistics()}`);
        try {
            await albumInfoUtils.fetch({ albumId: albumId });
        } catch (err) {
            console.error(err);
        }
        await sleepUtils.sleep(sleepTime);
    }

    // 从数据库中查出还缺少的歌手，并进行爬取
    console.log("start fetching artists ...")
    let artistIds = await dbUtils.query(`
        SELECT DISTINCT artist_id FROM song_artist_relation WHERE artist_id NOT IN ( SELECT DISTINCT artist_id FROM artist )
    `, []);
    artistIds = artistIds.map(item => item.artist_id);
    for (let i = 0; i < artistIds.length; i++) {
        await checkIsExit();
        const artistId = artistIds[i];
        console.log(`${i}/${artistIds.length} | artist: ${artistId} | ${await statistics()}`);
        try {
            await artistInfoUtils.fetch({ artistId: artistId });
        } catch (err) {
            console.error(err);
        }
        await sleepUtils.sleep(sleepTime);
    }
}

async function update() {
    console.log("neteaseMusic update ...");
    console.log(`数据统计: ${await statistics()}`);

    let sleepTime = 100;

    // 从数据库中查出现有专辑，并进行更新
    console.log("start fetching albums ...")
    let albumIds = await dbUtils.query(`
        SELECT DISTINCT album_id FROM album WHERE version = 1 -- and description like '%专辑《%》，简介：%'
    `, []);
    albumIds = albumIds.map(item => item.album_id);
    for (let i = 0; i < albumIds.length; i++) {
        await checkIsExit();
        const albumId = albumIds[i];
        console.log(`${i}/${albumIds.length} | album: ${albumId} | ${await statistics()}`);
        try {
            await albumInfoUtils.update({ albumId: albumId });
        } catch (err) {
            console.error(err);
        }
        await sleepUtils.sleep(sleepTime);
    }
}

async function statistics() {
    let sql = `
        SELECT
            song_count,
            album_count,
            album_v1_count,
            artist_count,
            song_album_count,
            song_artist_count
        FROM
            ( SELECT count(*) AS song_count FROM song ) t1,
            ( SELECT count(*) AS album_count FROM album ) t2,
            ( SELECT count(*) AS album_v1_count FROM album WHERE version = 1 ) t3_1,
            ( SELECT count(*) AS artist_count FROM artist ) t3,
            ( SELECT count(*) AS song_album_count FROM song_album_relation ) t4,
            ( SELECT count(*) AS song_artist_count FROM song_artist_relation ) t5`;
    let result = await dbUtils.query(sql, []);
    let songCount = result[0].song_count;
    let albumCount = result[0].album_count;
    let albumV1Count = result[0].album_v1_count;
    let artistCount = result[0].artist_count;
    let songAlbumCount = result[0].song_album_count;
    let songArtistCount = result[0].song_artist_count;
    return `song: ${songCount}, album: ${albumCount}(v1: ${albumV1Count}), artist: ${artistCount} | songAlbum: ${songAlbumCount}, songArtist: ${songArtistCount}`;
}

module.exports = {
    main: main,
    update: update,
    test: test,
}