// @ts-check

const path = require("path");

const ESLintPlugin = require("eslint-webpack-plugin");
const { merge } = require("webpack-merge");

const baseConfigs = require("./webpack.config.js");
const [main, vnc] = baseConfigs;

const shoelaceAssetsSrcPath = path.resolve(
  __dirname,
  "node_modules/@shoelace-style/shoelace/dist/assets",
);
const shoelaceAssetsPublicPath = "shoelace/assets";

if (!process.env.API_BASE_URL) {
  throw new Error(
    "To run a dev frontend server, please set the API_BASE_URL pointing to your backend api server in '.env.local'",
  );
}

// for testing: for prod, using the version specified in Helm values.yaml
const RWP_BASE_URL =
  process.env.RWP_BASE_URL || "https://cdn.jsdelivr.net/npm/replaywebpage/";

const devBackendUrl = new URL(process.env.API_BASE_URL);

module.exports = [
  merge(main, {
    devtool: "eval-cheap-source-map",
    /** @type {import('webpack-dev-server').Configuration} */
    devServer: {
      watchFiles: ["src/**/*", __filename],
      open: true,
      compress: false,
      hot: false,
      static: [
        {
          directory: shoelaceAssetsSrcPath,
          publicPath: "/" + shoelaceAssetsPublicPath,
        },
      ],
      historyApiFallback: true,
      proxy: {
        "/api": {
          target: devBackendUrl.href,
          headers: {
            Host: devBackendUrl.host,
          },
          ws: true,
        },

        "/data": {
          target: devBackendUrl.href,
          headers: {
            Host: devBackendUrl.host,
          },
        },
      },
      setupMiddlewares: (middlewares, server) => {
        // Serve replay service worker file
        server.app?.get("/replay/sw.js", (req, res) => {
          res.set("Content-Type", "application/javascript");
          res.send(`importScripts("${RWP_BASE_URL}sw.js")`);
        });

        server.app?.get("/replay/ui.js", (req, res) => {
          res.set("Content-Type", "application/javascript");
          res.redirect(307, RWP_BASE_URL + "ui.js");
        });

        // serve a 404 page for /replay/ path, as that should be taken over by RWP
        server.app?.get("/replay/*", (req, res) => {
          res.set("Content-Type", "application/javascript");
          res.status(404).send(`{"error": "placeholder_for_replay"}`);
        });

        // serve empty analytics script
        server.app?.get("/extra.js", (req, res) => {
          res.set("Content-Type", "application/javascript");
          res.status(200).send("");
        });

        return middlewares;
      },
      port: 9870,
    },
    cache: {
      type: "filesystem",
      hashAlgorithm: "xxhash64",
      buildDependencies: {
        config: [__filename],
      },
    },
    plugins: [
      new ESLintPlugin({
        extensions: ["ts", "js"],
      }),
    ],
  }),
  {
    ...vnc,
    mode: "production",
  },
];