'use strict'
const utils = require('./utils')
const webpack = require('webpack')
const config = require('../config')

const merge = require('webpack-merge')
const path = require('path')
const baseWebpackConfig = require('./webpack.base.conf')

const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')
const portfinder = require('portfinder')
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin

const HOST = process.env.HOST
const PORT = process.env.PORT && Number(process.env.PORT)

const devWebpackConfig = merge(baseWebpackConfig, {
    module: {
        rules: utils.styleLoaders({
            sourceMap: config.dev.cssSourceMap,
            usePostCSS: true
        })
    },
    
    // cheap-module-eval-source-map is faster for development
    devtool: config.dev.devtool,

    // these devServer options should be customized in /config/index.js
    devServer: {
        clientLogLevel: 'warning',
        // 404 页面配置
        historyApiFallback: {
            rewrites: [{
                from: /.*/,
                to: path.posix.join(config.dev.assetsPublicPath, 'index.html')
            },],
        },
        hot: true,
        contentBase: false, // since we use CopyWebpackPlugin.
        compress: true,
        host: HOST || config.dev.host,
        port: PORT || config.dev.port,
        open: config.dev.autoOpenBrowser,
        overlay: config.dev.errorOverlay ? {
            warnings: false,
            errors: true
        } : false,
        publicPath: config.dev.assetsPublicPath,
        proxy: config.dev.proxyTable,
        quiet: true, // necessary for FriendlyErrorsPlugin
        watchOptions: {
            poll: config.dev.poll,
        }
    },

    plugins: [

        // new BundleAnalyzerPlugin(),

        // 自动加载模块，而不必到处 import 或 require
        new webpack.ProvidePlugin({
            // marked: "marked",
            // $: 'jquery',
            // jQuery: 'jquery',
            _: 'lodash',
            Popper: ['popper.js', 'default'],
            utils: [path.join(__dirname, '..', 'src/utils'), 'default'],
        }),

        // 允许创建一个在编译时可以配置的全局常量
        new webpack.DefinePlugin({
            'process.env': require('../config/dev.env')
        }),

        // 模块热更新
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NamedModulesPlugin(), // HMR shows correct file names in console on update.
        new webpack.NoEmitOnErrorsPlugin(),

        // https://github.com/ampedandwired/html-webpack-plugin
        // 自动更新html中的入口文件
        new HtmlWebpackPlugin({
            filename: 'index.html', // html生成的文件 `/index.html`
            template: 'src/index.html', // webpack模板 默认为src/index.ejs
            inject: true,           // 开启自动注入模块入口文件
            favicon: path.resolve(__dirname, '../src/favicon.ico'),
            title: 'Crypto | ExChange | Market',
            isProduct :  process.env.NODE_ENV == 'production' ? true : false,
        }),

        // split vendor js into its own file
        new webpack.optimize.CommonsChunkPlugin({
            name: 'vendor',
            minChunks(module) {
                // any required modules inside node_modules are extracted to vendor
                return (
                    module.resource &&
                    /\.js$/.test(module.resource) &&
                    module.resource.indexOf(
                        path.join(__dirname, '../node_modules')
                    ) === 0
                )
            }
        }),

        // extract webpack runtime and module manifest to its own file in order to
        // prevent vendor hash from being updated whenever app bundle is updated
        new webpack.optimize.CommonsChunkPlugin({
            name: 'manifest',
            minChunks: Infinity
        }),

        // This instance extracts shared chunks from code splitted chunks and bundles them
        // in a separate chunk, similar to the vendor chunk
        // see: https://webpack.js.org/plugins/commons-chunk-plugin/#extra-async-commons-chunk
        new webpack.optimize.CommonsChunkPlugin({
            name: 'app',
            async: 'vendor-async',
            children: true,
            minChunks: 3
        }),

        // 将单个文件或整个目录复制到构建目录。
        // copy custom static assets，复制自定义静态资源
        new CopyWebpackPlugin([{
            from: path.resolve(__dirname, '../static'),
            to: config.dev.assetsSubDirectory,
            ignore: ['.*']
        }]),
        
        new CopyWebpackPlugin([{
            from: path.resolve(__dirname, '../static/newProduct'),
            to: config.dev.newProductRoot,
            ignore: ['.*']
        }]),
    ],

})

module.exports = new Promise((resolve, reject) => {
    // 基础端口号，以此往下找
    portfinder.basePort = process.env.PORT || config.dev.port
    portfinder.getPort((err, port) => {
        if (err) {
            reject(err)
        } else {
            // publish the new Port, necessary for e2e tests
            process.env.PORT = port
            // add port to devServer config
            devWebpackConfig.devServer.port = port

            // Add FriendlyErrorsPlugin
            devWebpackConfig.plugins.push(new FriendlyErrorsPlugin({
                compilationSuccessInfo: {
                    messages: [`Your application is running here: http://${devWebpackConfig.devServer.host}:${port}`],
                },
                onErrors: config.dev.notifyOnErrors ?
                    utils.createNotifierCallback() : undefined
            }))

            resolve(devWebpackConfig)
        }
    })
})