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import { type BunPlugin, plugin } from "bun";
import { Plugin } from "esbuild";

// A plugin compatible for both Bun and ESBuild
export const cssPlugin = {
  name: "CSS loader",
  async setup(build) {
    const { bundle } = await import("lightningcss");

    build.onLoad(
      {
        filter: /\/?website\/.+\.css$/,
      },
      ({ path }) => {
        if (path.endsWith(".module.css")) {
          const { code, exports } = bundle({
            filename: path,
            minify: true,
            cssModules: true,
            sourceMap: false,
          });

          const simplied = Object.fromEntries(
            Object.entries(exports || {}).map(([key, value]) => [
              key,
              value.name,
            ]),
          );

          // Bun's bundler seems not to support "object" loader.
          return {
            loader: "js",
            contents:
              "export default " +
              JSON.stringify(code.toString()) +
              ";export const cx=" +
              JSON.stringify(simplied) +
              ";",
          };
        }

        const { code } = bundle({
          filename: path,
          minify: true,
          sourceMap: false,
        });

        // Bun runtime seems not to support "text" loader.
        return {
          loader: "js",
          contents: "export default " + JSON.stringify(code.toString()),
        };
      },
    );
  },
} satisfies BunPlugin & Plugin;

await plugin(cssPlugin);