import path from 'path';
import { fileURLToPath } from 'url';
import webpack from 'webpack';
import TerserPlugin from 'terser-webpack-plugin';
import fs from 'fs';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// 读取 license 文件内容并转换为注释格式
const licensePath = path.resolve(__dirname, '../license.md');
const licenseContent = fs.readFileSync(licensePath, 'utf8');
const licenseComment = `/*!\n${licenseContent.split('\n').map(line => ` * ${line}`).join('\n')}\n */`;

export default {
 mode: 'production',
 entry: './src/index.js',
 output: {
 path: path.resolve(__dirname, 'dist'),
 filename: 'toolgood.algorithm.js',
 library: {
 name: 'ToolGood.Algorithm',
 type: 'umd',
 export: 'default'
 },
 globalObject: 'this'
 },
 module: {
 rules: [
 {
 test: /\.js$/,
 exclude: /node_modules/,
 use: {
 loader: 'babel-loader',
 options: {
 presets: [
 [
 '@babel/preset-env',
 {
 targets: {
 browsers: ['defaults']
 },
 modules: false,
 useBuiltIns: 'usage',
 corejs: 3
 }
 ]
 ],
 plugins: [
 '@babel/plugin-transform-runtime'
 ]
 }
 }
 }
 ]
 },
 resolve: {
 extensions: ['.js'],
 fallback: {
 "crypto": "crypto-browserify",
 "buffer": "buffer",
 "stream": "stream-browserify",
 "vm": "vm-browserify",
 "string_decoder": "string_decoder",
 "path": false,
 "fs": false,
 "net": false,
 "tls": false,
 "child_process": false
 }
 },
 plugins: [
 new webpack.DefinePlugin({
 'process.env': {
 NODE_ENV: JSON.stringify('production')
 },
 'process': {
 env: {
 NODE_ENV: JSON.stringify('production')
 },
 version: JSON.stringify('')
 }
 }),
 new webpack.BannerPlugin({
 banner: licenseComment,
 raw: true,
 entryOnly: true
 })
 ],
 optimization: {
 minimize: true,
 usedExports: true,
 sideEffects: false,
 concatenateModules: true,
 minimizer: [
 new TerserPlugin({
 terserOptions: {
 mangle: {
 toplevel: true,
 safari10: false,
 properties: {
 regex: /^[a-z_][a-zA-Z0-9—_]*$|^(Get|Set|Next|F_|State)[a-zA-Z0-9—_]*$|^[A-Z]+_[A-Z0-9_]+$/,// 小写字母开头都替换
 keep_quoted: false,
 }
 },
 compress: {
 drop_console: true,
 drop_debugger: true,
 passes: 3,
 }
 }
 })
 ]
 },
 performance: {
 hints: false,
 maxAssetSize: 1000000,
 maxEntrypointSize: 1000000
 }
};