'use strict'
      
    process.setMaxListeners(0);
      
    const fs = require('fs'),
        path = require('path'),
        exec = require('child_process'),
        inquirer = require('inquirer'),
        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'));
        })
    }
      
    // Setting screenshot options and 실행
    function setting() {
        // 포트번호
        let port;
      
        // 결과물
        let res;
      
        // screeshot options
        let mobileOpts = {
            fullPage: true,
            delay: 5,
            // emulateDevice: 'iPhone X',
            // width: mobileWidth,
        };
        let pcOpts = {
            fullPage: true,
            delay: 5,
            // width: pcWidth,
        };
      
        const questions = [
            {
                type: 'number',
                name: 'port',
                message: '포트번호를 입력해주세요.',
                default: 8000,
            },
            {
                type: 'confirm',
                name: 'result',
                message: '결과물을 텍스트 파일로 내보낼까요?',
            },
            {
                type: 'number',
                name: 'PCBrowserWidth',
                message: 'PC 브라우저 width 값을 얼마로 할까요?',
                default: 1280,
            },
            {
                type: 'confirm',
                name: 'iphoneX',
                message: '아이폰X 화면으로 찍으실건가요?',
            },
            {
                type: 'number',
                name: 'mobileBrowserWidth',
                message: '모바일 width 값은 얼마로 할까요?',
                default: 375,
                when: function (answers) {
                    if (answers.iphoneX) return false;
                    return true
                }
            }
        ];
        inquirer.prompt(questions).then(function (answers) {
            const answerData = JSON.stringify(answers);
            const answerDataJson = JSON.parse(answerData);
            port = answerDataJson.port;
            res = answerDataJson.result;
            pcOpts.width = answerDataJson.PCBrowserWidth;
            mobileOpts.emulateDevice = answerDataJson.iphoneX === true ? 'iPhone X' : '';
            mobileOpts.width = answerDataJson.mobileBrowserWidth;
        }).then(function () {
            // server 실행
            exec.exec(`http-server -a localhost -p ${port}`, {maxBuffer: 1024 * 500}, (err, stdout, stderr) => {
                if (err) {
                    console.error(err);
                    return;
                }
                console.log(stdout);
            });
      
            // 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();
                if (res) {
                    fs.writeFileSync('result.txt', com);
                    console.log(com);
                } else {
                    console.log(com);
                }
                process.exit();
            })();
        }).catch(function (err) {
            console.log(err);
        });
    }
      
    setting();