const fs = require('fs');
const { getApiResult } = require('../utils/requestUtils');
const dbUtils = require("../utils/dbPoolUtils");
const sleepUtils = require("../utils/sleepUtils");

// 数据库连接池
dbUtils.create({
    database: "neteasemusic",   // 指定数据库
    connectionLimit: 10,        // 设置数据库连接池数量
});
global.dbUtils = dbUtils;

const dataManager = require('./src/dataManager');
const requestUtils = require('../utils/requestUtils');

async function main() {
    var args = require('minimist')(process.argv.slice(2));
    global.args = {
        "order": args.order,
        "limit": args.limit,
    }
    // async function timeout1() {
    //     await getList();
    //     setTimeout(() => console.log("getList已完成"), 2000);
    // }
    // timeout1();

    async function timeout2() {
        await startFetchDetail();
        setTimeout(timeout2, 10 * 1000);
    }
    timeout2();

    async function timeout3() {
        await startFetchRealUrl();
        setTimeout(timeout3, 10 * 1000);
    }
    timeout3();
}

// 爬取列表页，获得歌曲详情页
async function getList() {

    let forumId = 1; // 分类id
    let beginPage = 1; // 起始页
    let endPage = 23; // 结束页
    for (let page = beginPage; page <= endPage; page++) {
        let url = `https://hifini.com/forum-${forumId}-${page}.htm?orderby=tid`; // 按照发帖时间排序
        console.log(`getList   \t| ${beginPage}/${page}/${endPage} | forumId: ${forumId} | ${url}`);

        // let html = fs.readFileSync("./1.html", "utf8");
        let html = await getApiResult(url);
        // fs.writeFileSync("./1.html", html);

        var matcher = html.matchAll(/<a href="thread-(\d{1,15}).htm">(.*?)<\/a>/g);
        var m = matcher.next();
        var threadList = [];
        while (!m.done) {
            // if (!/^.*?\[[-\/\.A-Za-z0-9]+?\]$/.exec(m.value[2])) {
            //     console.log(`跳过 ${m.value[2]}`);
            // } else {
            threadList.push({
                forum_id: forumId,
                thread_id: Number(m.value[1]),
                title: m.value[2]
            });
            // }
            m = matcher.next();
        }
        await dataManager.thread.insertCollection(threadList);
        await sleepUtils.sleep(1000);
    }
}

async function startFetchDetail() {
    let idsToFetch = await dataManager.thread.getIdsToFetch();
    idsToFetch = idsToFetch.map(item => item.thread_id);
    // console.log(idsToFetch);
    for (let i = 0; i < idsToFetch.length; i++) {
        const threadId = idsToFetch[i];
        console.log(`getDetail\t| ${i + 1}/${idsToFetch.length} | threadId: ${threadId}`);
        await getDetail(threadId);
        // await sleepUtils.sleep(100);
    }
}

async function getDetail(threadId) {

    let url = `https://hifini.com/thread-${threadId}.htm`;
    let html;
    try {
        // html = fs.readFileSync("./1.html", "utf8");
        html = await getApiResult(url, { timeout: 3000 });
        // fs.writeFileSync("./1.html", html);
    } catch (e) {
        console.error("请求失败，可能是请求超时", e);
        return;
    }

    // 解析到音乐信息
    var matcher = /var ap4 = new APlayer\(([\S\s]*?)\);/.exec(html);
    if (!matcher) {
        await dataManager.thread.update(threadId, 0, { music_title: "未解析到音乐" });
        console.log("未解析到音乐，跳过");
        return;
    }
    try {
        let arrStr = matcher[1];
        // console.log(arrStr);
        eval(`let document = { getElementById: () => {} }; var arr = ${arrStr};`);
        var musicArr = arr.music;
        // console.log(musicArr);
    } catch (e) {
        console.error("解析失败", e);
        return;
    }

    var matcher = html.matchAll(/<a href='tag-(\d{1,15}).htm'><i class="icon-tag"><\/i>(.*?)<\/a>/g);
    var m = matcher.next();
    var tagList = [];
    while (!m.done) {
        tagList.push({
            tag_id: Number(m.value[1]),
            tag_name: m.value[2]
        });
        m = matcher.next();
    }

    await dataManager.tag.insertCollection(tagList);

    await dataManager.thread_tag.insertCollection(tagList.map(tag => {
        return {
            thread_id: threadId,
            tag_id: tag.tag_id
        };
    }));

    if (musicArr.length > 1) {
        console.log("典型：thread_id:", threadId);
        await dataManager.thread.insertCollection(musicArr.map((music, i) => {
            return {
                thread_id: threadId,
                music_index: i
            }
        }));
    }
    for (let i = 0; i < musicArr.length; i++) {
        const music = musicArr[i];
        await dataManager.thread.update(threadId, i, {
            music_title: music.title,
            music_author: music.author || "",
            music_url: music.url,
            music_pic: music.pic || ""
        });
    }
    // console.log("done");
}

async function startFetchRealUrl() {
    let urlsToFetch = await dataManager.thread.getIdsToFetchRealUrl();
    // console.log(urlsToFetch.map(item => item.thread_id));
    for (let i = 0; i < urlsToFetch.length; i++) {
        const urlToFetch = urlsToFetch[i];
        console.log(`getRealUrl\t| ${i + 1}/${urlsToFetch.length} | threadId: ${urlToFetch.thread_id} | music_index: ${urlToFetch.music_index}`);
        await getRealUrl(urlToFetch.thread_id, urlToFetch.music_index, urlToFetch.music_url);
        // await sleepUtils.sleep(100);
    }
}

async function getRealUrl(threadId, musicIndex, fakeUrl) {
    let url = "原地址已失效";
    try {
        url = await requestUtils.getRedirectUrl(`https://hifini.com/${fakeUrl}`);
    } catch (e) {
        console.log("重定向地址获取失败");
    }
    result = await dataManager.thread.update(threadId, musicIndex, { music_real_url: url });
}

main();