const path = require("path");
const webpack = require('webpack');
const TerserPlugin = require("terser-webpack-plugin");
const HappyPack = require('happypack');
const os = require('os');
const happyThreadPool = HappyPack.ThreadPool({
    size: os.cpus().length
});

const common = require("./common");
const pathVars = require("./pathVars");
const pageVars = require("./pageVars");

//---------------------------------- output -----------------------------------//
const entryConfig = {};

let charts = pageVars.getCharts();

charts.forEach((chartItem) => {
    entryConfig[chartItem["chunkName"]] = chartItem["entryJs"];
});
console.log("entryConfig", entryConfig);
//---------------------------------- output -----------------------------------//

let outputConfig = {
    path: pathVars.chartsDistPath,
    publicPath: "./", // 表示资源的发布地址，当配置过该属性后，打包文件中所有通过相对路径引用的资源都会被配置的路径所替换(如：css中背景图的路径)
    filename: "[name].js",
    library: "[name]",
    libraryExport: 'default',
    umdNamedDefine: true,
    // es umd
    libraryTarget: "umd",
    
    assetModuleFilename: 'chartImages/[name]_[hash][ext][query]'
};


//---------------------------------- plugin -----------------------------------//
let pluginConfig = [
    new HappyPack({
        id: 'babel',
        loaders: ["babel-loader"],
        threadPool: happyThreadPool
    })
];

module.exports = {
    mode: 'production',
    entry: entryConfig,
    output: outputConfig,
    resolve: common.resolve,
    module: {
        rules: [{
                test: /\.(css|less)$/,
                include: [pathVars.srcPath],
                exclude: [pathVars.nodeModulesPath],
                use: [{
                        options: {
                            /* 解决css背景图路径问题 由于图片目录已经定好了，因此这里可以用固定的相对路径*/
                            publicPath: '../'
                        },
                    },
                    //"css-loader?modules&localIdentName=[name]__[local]-[hash:base64:5]",
                    "css-loader",
                    "less-loader"
                ],
            },
            {
                test: /\.js$/,
                exclude: pathVars.nodeModulesPath,
                include: pathVars.srcPath,
                use: ['babel-loader']
                //use: ["happypack/loader?id=babel"]
            },
            {
                test: /\.(png|jpg|gif|woff|svg|eot|ttf|woff2)$/,
                type: 'asset/resource',
                parser: {
                    dataUrlCondition: {
                        maxSize: 10 * 1024
                    }
                }
            },
            {
                test: /\.(glsl|vs|fs|vert|frag)$/,
                exclude: [pathVars.nodeModulesPath, pathVars.dllPath],
                use: ["raw-loader", "glslify-loader"]
            }
        ]
    },
    plugins: pluginConfig,
    optimization: {
        minimize: true,
        minimizer: [
            new TerserPlugin()
        ]
    }
};