const StrWebpackPlugin = require('str-webpack-plugin');
const { version } = require('./package.json');

function formatDate(input, fmt) {
    let date;
    if (input instanceof Date) {
        date = input;
    } else {
        date = new Date(input);
    }
    var o = {
        'M+': date.getMonth() + 1,
        'd+': date.getDate(),
        'H+': date.getHours(),
        'm+': date.getMinutes(),
        's+': date.getSeconds(),
        'S+': date.getMilliseconds()
    };
    if (/(y+)/.test(fmt)) {
        fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
    }
    for (var k in o) {
        if (new RegExp('(' + k + ')').test(fmt)) {
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (('00' + o[k]).substr(String(o[k]).length)));
        }
    }
    return fmt;
}

let libVersion = `${version}.${formatDate(new Date(), "MMdd.HHmm")}`

class EnvWebPackage extends StrWebpackPlugin {
    constructor({ entry, output, env }) {
        super(Object.keys(entry).map((name) => {
            return {
                src: output,
                test: new RegExp(`${name}.js`, 'g'),
                replace: {
                    form: [/\$\{lib_env\}/g, /\$\{lib_version\}/g],
                    to: [env, libVersion]
                }
            }
        }))
    }
}

module.exports = {
    EnvWebPackage
}