import { build, type BuildOptions, context } from "esbuild";
import CssModulesPlugin from "esbuild-css-modules-plugin";

import { copyFileSync, readFileSync, writeFileSync } from "fs";
import { join } from "path";
import os from "os";

const isLocal = process.argv.includes("--local");
const isWatch = process.argv.includes("--watch");

const options: BuildOptions = {
  entryPoints: ["src/main.ts"],
  outfile: "./dist/jellyfin-spicetify.js",
  bundle: true,
  minify: isLocal,
  platform: "browser",
  external: ["react", "react-dom"],
  plugins: [
    CssModulesPlugin({ pattern: "jellyfin-spicetify__[local]", localsConvention: "camelCaseOnly" }),
    {
      name: "external-global",
      setup(build) {
        build.onResolve({ filter: /^(react|react-dom)$/ }, (args) => ({
          path: args.path,
          namespace: "external-global",
        }));
        build.onLoad({ filter: /.*/, namespace: "external-global" }, (args) => ({
          contents: `module.exports = Spicetify.${args.path === "react" ? "React" : "ReactDOM"};`,
        }));
      },
    },
    {
      name: "on-end",
      setup(build) {
        build.onEnd(() => {
          const js = readFileSync("./dist/jellyfin-spicetify.js", "utf-8");
          const css = readFileSync("./dist/jellyfin-spicetify.css", "utf-8");

          const wrapped = `
					// https://github.com/trafficlunar/jellyfin-spicetify
					(async function() {
						while (!Spicetify.React || !Spicetify.ReactDOM) {
							await new Promise(resolve => setTimeout(resolve, 10));
						}
						const s = document.createElement("style");
						s.id = "jellyfin-spicetify";
						s.textContent = ${JSON.stringify(css)};
						document.head.appendChild(s);
						${js}
					})();`.trim();

          writeFileSync("./dist/jellyfin-spicetify.js", wrapped);

          if (!isLocal) {
            const path =
              os.platform() === "win32"
                ? join(process.env.APPDATA!, "spicetify", "Extensions", "jellyfin-spicetify.js")
                : join(process.env.HOME!, ".config", "spicetify", "Extensions", "jellyfin-spicetify.js");

            copyFileSync("./dist/jellyfin-spicetify.js", path);
          }

          console.log("Built!");
        });
      },
    },
  ],
};

if (isWatch) {
  const ctx = await context(options);
  console.log("Watching...");
  await ctx.watch();
} else {
  await build(options);
}