const fs = require('fs');
const path = require('path');
const iconv = require('iconv-lite');//安装第三方库转换编码格式
const readline = require('readline');
const chalk = require('chalk')

// var filename = path.join(__dirname, './../lyrics/晴天.lrc');
var filename = path.join(__dirname, './lyric.lrc');
var streamReader = fs.createReadStream(filename).pipe(iconv.decodeStream('utf8')) // gbk

console.clear();
playMusic();
setTimeout(main, 2600); // 音频加载时间
function main() {
    // 利用readline读取
    var rl = readline.createInterface({ input: streamReader });
    var begin = new Date().getTime();
    rl.on('line', (line) => {
        task(line, begin);
    });
}

var displayLyric = [], index = 0;
var regex = /\[(\d{2})\:(\d{2})\.(\d{2,3})\][ ]*(.+)[ ]*/;
function task(line, begin) {
    var matches = regex.exec(line);
    if (matches) {
        var m = parseFloat(matches[1]);
        var s = parseFloat(matches[2]);
        var f = parseFloat(matches[3]);
        var lyric = matches[4];
        displayLyric.push(lyric);
        var offset = new Date().getTime() - begin;
        setTimeout(() => {
            console.clear();
            console.log(chalk.dim(displayLyric[index - 2] || ""));
            console.log(chalk.hex('#b3b3b3').visible(displayLyric[index - 1] || ""));
            console.log(chalk.hex('#FFFFFF').bold(displayLyric[index]));
            console.log(chalk.hex('#b3b3b3').visible(displayLyric[index + 1] || ""));
            console.log(chalk.dim(displayLyric[index + 2] || ""));
            index++;
            // console.log(lyric);
        }, m * 60 * 1000 + s * 1000 + f - offset);
    } else {
        // 不是一行歌词
        // console.log("err", line);
    }
}


function playMusic() {
    var player = require('play-sound')(opts = {})
    player.play('./music.m4a', function (err) {
        if (err) throw err;
        console.log("消愁 - 毛不易");
    });
}