const path = require('path')
const settings = require('./src/config')
const CompressionWebpackPlugin = require('compression-webpack-plugin')
const isDev = process.env.NODE_ENV === 'development'

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

module.exports = {
    publicPath: settings.contextPath,
    outputDir: 'dist',
    assetsDir: 'static',
    runtimeCompiler: true,
    lintOnSave: false,
    productionSourceMap: isDev,
    transpileDependencies: ['el-admin-layout'],
    devServer: {
        port: process.env.port || 8079,
        contentBasePublicPath: settings.contextPath,
        open: true,
        overlay: {
            warnings: true,
            errors: true
        },
        proxy:
            settings.useMock
                ? null
                : {
                    [settings.apiPrefix]: {
                        target: 'http://localhost:8081',  //后台接口域名
                        ws: true,                         //如果要代理 websockets，配置这个参数
                        secure: false,                    //如果是https接口，需要配置这个参数
                        changeOrigin: true,               //是否跨域
                        pathRewrite: {
                            [`^${settings.apiPrefix}`]: ''
                        }
                    }
                },
        before: settings.useMock ? app => require('./mock')(app) : undefined
    },
    configureWebpack: {
        name: settings.title,
        resolve: {
            alias: {
                '@': resolve('src'),
                '@ele': resolve('element-ui-personal')
            }
        }
    },
    chainWebpack(config) {
        config.plugins.delete('preload')
        config.plugins.delete('prefetch')

        // set svg-sprite-loader
        config
            .module
            .rule('svg')
            .exclude.add(resolve('src/asset/icon'))
            .end()
        config
            .module
            .rule('icons')
            .test(/\.svg$/)
            .include.add(resolve('src/asset/icon'))
            .end()
            .use('svg-sprite-loader')
            .loader('svg-sprite-loader')
            .options({symbolId: 'icon-[name]'})
            .end()

        config.when(!isDev, config => {
            //将css合并到一个文件中
            //https://github.com/vuejs/vue-cli/issues/2843
            config
                .optimization
                .removeEmptyChunks(true)
                .splitChunks({
                    cacheGroups: {
                        style: {
                            name: 'style',
                            type: 'css/mini-extract',
                            chunks: 'all'
                        },
                    }
                })
                .end()

            //生成gz
            config
                .plugin('compression-webpack-plugin')
                .use(CompressionWebpackPlugin, [{
                    test: new RegExp('\\.(js|css)$'),  //匹配文件名
                    threshold: 10 * 1024,               //对10K以上的数据进行压缩
                }])
                .end()
        })
    }
}