'use strict'
      
    process.setMaxListeners(0);
      
    const fs = require('fs'),
        path = require('path'),
        exec = require('child_process').exec,
        captureWebsite = require('capture-website'),
        resemble = require('resemblejs'),
        file = [
            path.join(__dirname, 'pc/before'),
            path.join(__dirname, 'pc/after'),
            path.join(__dirname, 'm/before'),
            path.join(__dirname, 'm/after')
        ],
        before = fs.readFileSync(path.join(__dirname, 'dist/before/index.html'), 'utf8'),
        after = fs.readFileSync(path.join(__dirname, 'dist/after/index.html'), 'utf8');
      
    // make folders
    file.map(f => fs.mkdirSync(f, { recursive: true }))
      
    // before index.html 과 after index.html 파일에서 리스트를 추출하여 beforeList, afterList 변수에 저장
    let beforeList = before.match(/[src]*\/*html\/(.*?)\.html/g),
        afterList = after.match(/[src]*\/*html\/(.*?)\.html/g),
        beforeItems = [],
        afterItems = [];
      
    // beforeItems 배열과 afterItems 배열에 로컬서버 주소를 각각 저장
    for (let i=0; i<beforeList.length; i++) {
        if (!Array.isArray(beforeItems[i])) beforeItems[i] = [];
        beforeItems[i] = [`http://localhost:8000/dist/before/${beforeList[i]}`, path.basename(beforeList[i])]
    }
    for (let i=0; i<afterList.length; i++) {
        if (!Array.isArray(beforeItems[i])) afterItems[i] = [];
        afterItems[i] = [`http://localhost:8000/dist/after/${afterList[i]}`, path.basename(afterList[i])]
    }
      
    // screenshot compare function
    const compare = () => {
        const num = beforeList.length > afterList.length ? afterList.length : beforeList.length,
            res = ['pc', 'm'];
        let compareRes = [];
        return new Promise(resolve => {
            res.map(a => {
                for (let i=0; i<num; i++) {
                    resemble(path.join(__dirname, `${a}/before/${path.basename(beforeList[i])}.png`))
                        .compareTo(path.join(__dirname, `${a}/after/${path.basename(afterList[i])}.png`))
                        .onComplete(function (data) {
                            let diff = JSON.stringify(data.diffBounds)
                            if (data.misMatchPercentage !== '0.00') {
                                compareRes.push(`${a} - ${beforeList[i]} : ${afterList[i]} = ${data.misMatchPercentage}, ${diff}`);
                            }
                        });
                }
            })
            resolve(compareRes.join('\n'));
        })
    }
      
    // screeshot options
    const mobileOpts = {
        width: 480,
        fullPage: true,
        // emulateDevice: 'iPhone X',
        delay: 5
    };
    const pcOpts = {
        fullPage: true,
        delay: 5
    };
      
    // server 실행
    exec('http-server -a localhost -p 8000');
      
    // screenshot and compare
    (async () => {
        await Promise.all(beforeItems.map(([url, filename]) => {
            return captureWebsite.file(url, path.join(__dirname, `pc/before/${filename}.png`), pcOpts);
        }));
        await Promise.all(afterItems.map(([url, filename]) => {
            return captureWebsite.file(url, path.join(__dirname, `pc/after/${filename}.png`), pcOpts);
        }));
        await Promise.all(beforeItems.map(([url, filename]) => {
            return captureWebsite.file(url, path.join(__dirname, `m/before/${filename}.png`), mobileOpts);
        }));
        await Promise.all(afterItems.map(([url, filename]) => {
            return captureWebsite.file(url, path.join(__dirname, `m/after/${filename}.png`), mobileOpts);
        }));
        const com = await compare();
        console.log(com);
        process.exit();
    })();