const webpack = require("webpack");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const TerserPlugin = require("terser-webpack-plugin");
const path = require("path");
const autoprefixer = require("autoprefixer");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const CircularDependencyPlugin = require("circular-dependency-plugin");
const childProcess = require("child_process");

function git(command) {
    return childProcess.execSync(`git ${command}`).toString().trim();
}

let lessVariables = {};

if (process.env.LESS_CONFIG_PATH) {
    const lessConfigPath = path.isAbsolute(process.env.LESS_CONFIG_PATH)
        ? process.env.LESS_CONFIG_PATH
        : path.resolve(__dirname, "lessconfig", process.env.LESS_CONFIG_PATH);

    lessVariables = fs.existsSync(lessConfigPath) ? require(lessConfigPath) || {} : {};
}

module.exports = {
    mode: "production",
    entry: {
        "fineui.min": "./src/bundle.js",
    },
    output: {
        path: path.resolve(__dirname, "dist"),
        filename: "[name].js",
    },
    devtool: "hidden-source-map",
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader",
                },
            },
            {
                test: /\.(css|less)$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    {
                        loader: "css-loader",
                        options: {
                            url: false,
                        },
                    },
                    {
                        loader: "postcss-loader",
                        options: {
                            plugins: [autoprefixer],
                        },
                    },
                    {
                        loader: "less-loader",
                        options: {
                            relativeUrls: false,
                            modifyVars: lessVariables,
                        },
                    },
                ],
            },
        ],
    },
    resolve: {
        extensions: [".js", ".ts"],
        alias: {
            "@": path.resolve(__dirname, "src"),
        },
    },
    plugins: [new CircularDependencyPlugin()],
    optimization: {
        usedExports: false,
        minimize: true,
        minimizer: [
            new TerserPlugin({
                include: /\.js$/i,
            }),
            new webpack.BannerPlugin({
                banner: `time: ${new Date().toLocaleString()}; branch: ${git(
                    "name-rev --name-only HEAD"
                )} commit: ${git("rev-parse HEAD")}`,
            }),
        ],
    },
};