const request = require('request');
const iconv = require('iconv-lite');
const cheerio = require('cheerio');
const fs = require('fs');


// var Iconv  = require('iconv').Iconv;

var baseUrl = 'https://pic.netbian.com';

// 1034 页，主要存放 页面地址的
var pageArr = [];
var pageIndex = 0

 
var hrefArr = [];
var hrefIndex = 0;

for (var i = 1; i <= 100; i++) {
    if (i == 1) {
        pageArr.push(baseUrl)
    } else {
        pageArr.push(`${baseUrl}/index_${i}.html`)
    }
}

console.log("pageArr: ", pageArr);

function requestPage() {
    getHtml(pageArr[pageIndex], ($) => {
        $(".slist li").each(function (index, ele) {
            if (!$(this).hasClass("nextpage")) {
                hrefArr.push(
                    `${baseUrl}${$(this).find("a").attr("href")}`
                )
            }
        })


        requestInfo()

        console.log("hrefArr: ", hrefArr);
    })
}


function requestInfo() {
    getHtml(hrefArr[hrefIndex], ($) => {
        request(`${baseUrl}${$(".photo-pic img").attr("src")}`)
        .pipe(
            fs.createWriteStream(`./img/${ Math.random() * 1000000 + `${Date.now()}` }.jpg`)
        )

        hrefIndex += 1;
        if (hrefIndex < hrefArr.length) {
            requestInfo()
        } else {
            pageIndex += 1
            if (pageIndex < pageArr.length) {
                requestPage()
            }
        }
        
    })

}


function getHtml(url, callback) {
    request({
        uri: url,
        method: 'GET',
        encoding: 'binary'
    }, function (error, response, body) {
        var str2 = iconv.decode(new Buffer(body, 'binary'), 'gbk');
        const $ = cheerio.load(str2);
        callback($)
    });
}

requestPage()