const http = require('./http');
const config = require('./config');
const fs = require('fs');

let urlArr = [] // 存放被请求的页面地址
let urlArrIndex = 0; // 默认从第几页开始爬


let pageArr = [] // 存放每一页的20条li数据
let pageArrIndex = 0 // 默认爬第几页的第几个图片

for (let i = 1; i <= 10; i++) {
    if (i == 1) {
        urlArr.push(`${config.url}index.html`)
    } else {
        urlArr.push(`${config.url}index_${i}.html`)
    }
}


async function getUrlArr() {

    let $ = await http.get({
        url: urlArr[urlArrIndex],
        type: 1
    });
    $(".slist li").each(function () {
        pageArr.push({
            title: $(this).find("b").text(),
            img: config.picUrl+$(this).find("img").attr("src"),
            url: config.picUrl+$(this).find("a").attr("href")
        })
    });

    getPageArr()
}


async function getPageArr() {
    console.log(`已获取第 ${urlArrIndex + 1}页, 的第几张 ${pageArrIndex + 1}图`)
    let $ = await http.get({
        url: pageArr[pageArrIndex].url,
        type: 1
    });

    downImg(config.picUrl + $(".photo-pic img").attr("src"))
}

async function downImg(url) {
    let res = await http.get({
        url: url,
        type: 2
    });

    res.pipe(fs.createWriteStream(`img/${fileName()}.jpg`));
    pageArrIndex += 1;

    if (pageArrIndex <= 19) {
        getPageArr()
    } else {
        urlArrIndex += 1;
        if (urlArrIndex < 10) {
            pageArrIndex = 0;
            pageArr = [];
            getUrlArr()
        }
    }
}

function fileName() {
    return `${Math.random() * 1000000}${Date.parse(new Date())}`
}
getUrlArr()