let path = require("path");
const webpack = require("webpack");
const ThemeColorReplacer = require("webpack-theme-color-replacer");
const { getThemeColors, modifyVars } = require("./src/utils/themeUtil");
const { resolveCss } = require("./src/utils/theme-color-replacer-extend");
const CompressionWebpackPlugin = require("compression-webpack-plugin");

const productionGzipExtensions = ["js", "css"];
const isProd = process.env.NODE_ENV === "production";

const assetsCDN = {
    // webpack build externals
    externals: {},
    css: [],
    js: [],
};

module.exports = {
    devServer: {
        open: true,
        proxy: {
            "/api": {
                target: process.env.VUE_APP_API_BASE_URL,
                changeOrigin: true,
                pathRewrite: {
                    "^/api": "",
                },
            },
        },
    },
    pluginOptions: {
        "style-resources-loader": {
            preProcessor: "less",
            patterns: [path.resolve(__dirname, "./src/theme/theme.less")],
        },
    },
    configureWebpack: config => {
        config.entry.app = ["babel-polyfill", "whatwg-fetch", "./src/main.js"];
        config.performance = {
            hints: false,
        };
        config.plugins.push(
            new ThemeColorReplacer({
                fileName: "css/theme-colors-[contenthash:8].css",
                matchColors: getThemeColors(),
                injectCss: true,
                resolveCss,
            })
        );
        // Ignore all locale files of moment.js
        config.plugins.push(new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/));
        // 生产环境下将资源压缩成gzip格式
        if (isProd) {
            // add `CompressionWebpack` plugin to webpack plugins
            config.plugins.push(
                new CompressionWebpackPlugin({
                    algorithm: "gzip",
                    test: new RegExp("\\.(" + productionGzipExtensions.join("|") + ")$"),
                    threshold: 10240,
                    minRatio: 0.8,
                })
            );
        }
        // if prod, add externals
        if (isProd) {
            config.externals = assetsCDN.externals;
        }
    },
    chainWebpack: config => {
        // 生产环境下关闭css压缩的 colormin 项，因为此项优化与主题色替换功能冲突
        if (isProd) {
            config.plugin("optimize-css").tap(args => {
                args[0].cssnanoOptions.preset[1].colormin = false;
                return args;
            });
        }
        // 生产环境下使用CDN
        if (isProd) {
            config.plugin("html").tap(args => {
                args[0].cdn = assetsCDN;
                return args;
            });
        }
    },
    css: {
        loaderOptions: {
            less: {
                lessOptions: {
                    modifyVars: modifyVars(),
                    javascriptEnabled: true,
                },
            },
        },
    },
    publicPath: process.env.VUE_APP_PUBLIC_PATH,
    outputDir: "dist",
    assetsDir: "static",
    productionSourceMap: false,
};