const isProduction = process.env.NODE_ENV === 'production';
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
const CompressionPlugin = require('compression-webpack-plugin')
const path = require('path');

module.exports = {
    publicPath: './',
    // assetsDir: 'public',
    filenameHashing: true,
    productionSourceMap: false,
    parallel: require('os').cpus().length > 1,
    lintOnSave: false,
    pluginOptions: {
        route: {
            // 默认：page。存放Vue路由页面的文件夹名称
            TemplateFolderName: 'page',
            // 默认：./src/application。从src/开始到TemplateFolderName文件夹父一级文件夹相对路径
            RootFolderName: './src/application',
            // 默认 src/core/config/route.config.ts。生成的配置文件保存路径，相对插件的位置来。
            SaveConfigPath: '../../../src/core/config/route.config.ts'
        }
    },
    devServer: {
        hot: true,
        hotOnly: true,
        host: '0.0.0.0',
        port: 9000,
        compress: true,
        open: true,
        openPage: '#/User/Login',
        overlay: {
            warnings: false,
            errors: true,
        },
    },
    configureWebpack: (config) => {
        // 设置程序核心入口
        config.entry.app = ['babel-polyfill', './src/core/run/start.run.ts'];


        if (process.env.NODE_ENV === 'production') {

            /**
             * Gzip压缩
             */
            config.mode = 'production'
            return {
                plugins: [new CompressionPlugin({
                    test: /\.js$|\.html$|\.css/, //匹配文件名
                    threshold: 10240, //对超过10k的数据进行压缩
                    deleteOriginalAssets: false //是否删除原文件
                })]
            }

            /**
             * 去除这些公共包，让webpack不打包到项目源码的js中，减小项目js体积
             * 然后使用 pages 节点下的 cdn 数组里面的资源外链来引入。
             */
            config.externals = {
                vue: 'Vue',
                'vue-router': 'VueRouter',
                axios: 'axios',
                Vant: 'Vant',
            };

            /**
             * 部署阶段 代码压缩
             */
            config.plugins.push(
                // 生产环境自动删除console
                new UglifyJsPlugin({
                    uglifyOptions: {
                        compress: {
                            warnings: false,
                            drop_debugger: true,
                            drop_console: true,
                        },
                    },
                    sourceMap: false,
                    parallel: true,
                }),
            );

            // 开启 BundleAnalyzerPlugin
            return {
                plugins: [
                    new BundleAnalyzerPlugin(),
                ],
            };

        }

    },
    chainWebpack: (config) => {

        if (process.env.NODE_ENV === 'production') {
            // 去除混淆加密
            config.optimization.minimize(false)
        }


        /**
         * 移除不必要的 prefetch 和 preload请求
         */
        config.plugins.delete('prefetch');
        config.plugins.delete('preload');

        /**
         * html 模板引擎 pug 配置
         */
        config.module.rule('pug')
            .test(/\.pug$/)
            .use('pug-html-loader')
            .loader('pug-html-loader')
            .end();

        /**
         * 导入全局css
         * @type {*[]}
         */
        const types = ['vue-modules', 'vue', 'normal-modules', 'normal'];
        types.forEach(type => addStyleResource(config.module.rule('stylus').oneOf(type)));


        /**
         * 配置路径别名，项目中引用资源的时候路径可以更简短
         * 但是ts文件在用的时候，编译器会报错，需要添加 @ts-ignore
         * 忽略开发工具的错误。
         */
        config.resolve.alias
            .set('@', resolve('src'))
            .set('@core', resolve('src/core'))
            .set('@router', resolve('src/core/router'))
            .set('@store', resolve('src/core/store'))
            .set('@types', resolve('src/core/types'))
            .set('@config', resolve('src/core/config'))
            .set('@utils', resolve('src/core/utils'))
            .set('@run', resolve('src/core/run'))
            .set('@ann', resolve('src/core/annotation'))
            .set('@model', resolve('src/core/model'))
            .set('@dao', resolve('src/core/dao'))
            .set('@service', resolve('src/core/service'))
            .set('@impl', resolve('src/core/service/impl'))

            .set('@application', resolve('src/application'))
            .set('@img', resolve('src/application/assets/img'))
            .set('@less', resolve('src/application/assets/less'))
            .set('@lessCom', resolve('src/application/assets/less/components'))
            .set('@pageLess', resolve('src/application/assets/less/page'))
            .set('@components', resolve('src/application/components'))
            .set('@page', resolve('src/application/page'))
            .set('@logic', resolve('src/application/logic'))
            .set('@layout', resolve('src/application/layout'))

    }

};

function resolve(dir) {
    return path.join(__dirname, dir);
}

function addStyleResource(rule) {
    rule.use('style-resource')
        .loader('style-resources-loader')
        .options({
            patterns: [
                path.resolve(__dirname, './src/application/assets/less/imports.less')
            ],
        });
}