const glob = require('glob') // 处理文件路径用到，很有用
const path = require('path')
const fs = require('fs')
const chalk = require('chalk')
const HtmlWebpackPlugin = require('html-webpack-plugin') // 将打包后js自动引入html文件插件
const { CleanWebpackPlugin } = require('clean-webpack-plugin') // 清除打包文件工具
const MiniCssExtractPlugin = require('mini-css-extract-plugin') // 分离css
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin') // css压缩去重
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin // 可视化分析
const cleanPath = [path.join(__dirname, './dist')]
// 多页面配置函数
const pagesSetting = () => {
    const entries = {}
    const htmlWebpackPlugins = []
    const files = glob.sync(path.join(__dirname, './src/pages/**/*.js'))
    files.forEach((file) => {
        const match = file.match(/\/pages\/(.*)\/(.*).js$/)
        const entry = match && match[1] // 文件夹
        // 保存入口文件
        entries[entry] = file
        const pageFiles = fs.readdirSync(path.resolve(file, '..'))
        const htmlFile = pageFiles.filter((file) => /\.html$/.test(file))
        if (htmlFile.length > 0) {
            htmlWebpackPlugins.push(new HtmlWebpackPlugin({
                template: path.join(__dirname, `./src/pages/${entry}/${htmlFile[0]}`),
                filename: `${htmlFile[0]}`,
                chunks: [entry],
                inject: true, // 将js放在body底部
                minify: {
                    collapseWhitespace: true, // 折叠标签空白
                    minifyCSS: true,
                    minifyJS: true
                }
            }))
        } else {
            console.log(chalk.red(`${path.resolve(file, '..')}目录下无模板文件`))
        }
    })
    return {
        entries,
        htmlWebpackPlugins
    }
}
const { entries, htmlWebpackPlugins } = pagesSetting()
module.exports = {
    mode: 'development',
    entry: entries,
    output: {
        path: path.resolve(__dirname, './dist'),
        filename: "[name].[chunkhash:8].js",
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        "presets": [
                            ["@babel/preset-env", {
                                "modules": false,
                                "targets": {
                                    "browsers": ["> 1%", "last 2 versions", "not ie <= 8"]
                                },
                                "useBuiltIns": "usage"
                            }]
                        ],
                        "plugins": [
                            "@babel/plugin-transform-runtime"
                        ]
                    }
                }
            },
            {
                test: /\.css$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    { loader: 'css-loader' },
                    { loader: "postcss-loader" }
                ]
            },
            {
                test: /\.less$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    { loader: 'css-loader' },
                    { loader: "postcss-loader" },
                    { loader: 'less-loader' }
                ]
            },
            {
                test: /\.scss$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    { loader: 'css-loader' },
                    { loader: "postcss-loader" },
                    { loader: 'sass-loader' }
                ]
            },
            {
                test: /\.styl$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    { loader: 'css-loader' },
                    { loader: "postcss-loader" },
                    { loader: 'stylus-loader' }
                ]
            },
            {
                test: /\.(bmp|png|jpg|jpeg|ico|gif)$/,
                use: [
                    {
                        loader: 'url-loader',
                        options: {
                            limit: 1024 * 12, // 文件小于12kb，输出DataUrl
                            outputPath: 'assets/images', // 该路径相对于html输出路径
                            publicPath: '../../assets/images',
                            name: '[name].[ext]'
                        }
                    }
                ]
            },
            {
                test: /\.html$/,
                use: [
                    {
                        loader: 'html-loader',
                        options: {
                            attrs: ['img:src', 'img:data-src', 'audio:src'],
                            minimize: false,
                        }
                    }
                ]
            },
            {
                test: /\.(woff2?|woff|svg|eot|ttf)(\?.*)?$/,
                use: [
                    {
                        loader: "url-loader",
                        options: {
                            name: "[name].[ext]",
                            limit: 1024 * 5,
                            outputPath: 'assets/fonts/'
                        }
                    }
                ]
            }
        ]
    },
    plugins: [
        ...htmlWebpackPlugins,
        new CleanWebpackPlugin({
            cleanOnceBeforeBuildPatterns: cleanPath
        }),
        new MiniCssExtractPlugin({
            filename: 'pages/[name]/[name].[chunkhash:8].css',
        }),
        new OptimizeCssAssetsPlugin({
            assetNameRegExp: /\.css$/g,
            cssProcessor: require('cssnano'),
            cssProcessorPluginOptions: {
                preset: [
                    'default',
                    { discardComments: { removeAll: true } }
                ],
            },
            canPrint: true
        }),
        // new BundleAnalyzerPlugin()
    ],
    devServer: {
        host: "circuit.dianwutong.com",
        open: false,
        port: 8083,
        compress: true,
        historyApiFallback: {
            rewrites: [
                { from: /^\/draw/, to: '/draw.html' },
                { from: /^\/run/, to: '/run.html' },
                { from: /./, to: '/draw.html' },
            ]
        },
        // proxy: {
        //     '/ems': {
        //         target: 'http://api.dianwutong.com',
        //         changeOrigin: true
        //     }
        // }
    }
}