'use strict';

/**
 *
 *
 * @author Mai
 * @date
 * @version
 */


const crypto = require('crypto');
const Uglyfy = require('uglify-es');
const fs = require('fs');
const JsFiles = require('./config/web');
const version = require('./config/config.default')({ baseDir: __dirname + '/app', root: __dirname, name: 'calc' }).version;
console.log(version);
const savePath = __dirname + '/app' + JsFiles.webPath;
const cachePath = __dirname + '/app' + JsFiles.cachePath;
const cacheInfoFile = cachePath + 'cache.json';
let cacheInfo = [];
const newCacheInfo = [];

if (!fs.existsSync(savePath)) fs.mkdirSync(savePath);
if (!fs.existsSync(cachePath)) fs.mkdirSync(cachePath);

const loadCache = function () {
    if (fs.existsSync(cacheInfoFile)) {
        cacheInfo = require(cacheInfoFile);
    }
};

const getMd5 = function (text) {
    const hash = crypto.createHash('md5');
    hash.update(text);
    return hash.digest('hex');
};

const findCache = function (file) {
    let cache = cacheInfo.find(x => { return x.file === file; });
    if (!cache) {
        cache = { file: file };
        cacheInfo.push(cache);
    }
    if (!cache.new_md5) {
        cache.text = fs.readFileSync(__dirname + '/app' + file, 'utf8');
        cache.new_md5 = getMd5(cache.text);
    }
    return cache;
};

const checkUseCache = function(files) {
    for (const f of files) {
        const cache = findCache(f);
        if (cache.md5 !== cache.new_md5) return false;
    }
    return true;
};

const mergeAndMin = function () {
    console.time('min');
    loadCache();
    for (const c in JsFiles.controller) {
        const controller = JsFiles.controller[c];
        for (const a in controller) {
            const action = controller[a];
            if (action.mergeFiles && action.mergeFile.length > 0) {
                const minFileName = savePath + action.mergeFile + '.' + version + '.min.js';
                const cacheFileName = cachePath + action.mergeFile + '.cache.js';
                const useCache = checkUseCache(action.mergeFiles);
                if (useCache && fs.existsSync(cacheFileName)) {
                    fs.copyFileSync(cacheFileName, minFileName);
                } else {
                    let code = '';
                    for (const f of action.mergeFiles) {
                        const cache = findCache(f);
                        code = code + cache.text;
                    }
                    fs.writeFileSync(minFileName, Uglyfy.minify(code, { mangle: true }).code);
                    fs.copyFileSync(minFileName, cacheFileName);
                }
                console.log(minFileName, `cache: ${useCache}`);
            }
        }
    }

    let needMinCode = '';
    for (const nm of JsFiles.needMin) {
        needMinCode = needMinCode + fs.readFileSync(__dirname + '/app' + nm, 'utf8');
    }

    const needMinFileName = __dirname + '/app/public/js/web/global.' + version + '.min.js';
    fs.writeFileSync(needMinFileName, Uglyfy.minify(needMinCode, { mangle: true }).code);

    const needVersionCss = ['/public/css/main'];
    for (const nvc of needVersionCss) {
        fs.copyFileSync(__dirname + '/app' + nvc + '.css', __dirname + '/app' + nvc + '.' + version + '.css');
    }

    fs.writeFileSync(cacheInfoFile, JSON.stringify(cacheInfo.map(x => { return { file: x.file, md5: x.new_md5 || x.md5 }; })));
    console.timeEnd('min');
};

mergeAndMin();