import {createRequire} from "node:module";
import path from "node:path";

// Resolve build dependencies from the package's locked node_modules, not from
// the helper's own Nix-store location. This program runs only during the build.
const require = createRequire(path.join(process.cwd(), "package.json"));
const {build} = require("esbuild");
const options = JSON.parse(process.argv[2]);
const platform = new Map([
  ["react", "/__quixos/platform/react/v18.mjs"],
  ["react/jsx-runtime", "/__quixos/platform/react-jsx-runtime/v18.mjs"],
  ["react/jsx-dev-runtime", "/__quixos/platform/react-jsx-dev-runtime/v18.mjs"],
  ["@quixos/web-studio-react-runtime", "/__quixos/platform/web-studio-react-runtime/v1.mjs"],
]);
await build({...options, plugins: [{name: "quixos-browser-source", setup(api) {
  api.onResolve({filter: /\?browser-source$/}, async ({path: specifier, resolveDir}) => {
    if (!specifier.startsWith("./") && !specifier.startsWith("../")) throw new Error("Browser source imports must name a relative compiled module");
    const resolved = await api.resolve(specifier.slice(0, -"?browser-source".length), {resolveDir, kind: "import-statement"});
    if (resolved.errors.length) return {errors: resolved.errors};
    return {path: resolved.path, namespace: "browser-source"};
  });
  api.onLoad({filter: /.*/, namespace: "browser-source"}, async ({path: entry}) => {
    const browser = await build({entryPoints: [entry], bundle: true, write: false, outfile: "component.mjs",
      format: "esm", platform: "browser", target: "es2022", metafile: true,
      plugins: [{name: "quixos-platform", setup(browserApi) {
        browserApi.onResolve({filter: /.*/}, ({path: name}) => platform.has(name) ? {path: platform.get(name), external: true} : undefined);
      }}]});
    const js = browser.outputFiles.find(file => file.path.endsWith(".mjs"));
    if (!js) throw new Error("Browser source build produced no JavaScript");
    const css = browser.outputFiles.find(file => file.path.endsWith(".css"));
    if (css && Object.values(browser.metafile.outputs).some(output => output.exports?.includes("styles"))) throw new Error("Use either imported CSS or an explicit styles export, not both");
    if (browser.outputFiles.some(file => !file.path.endsWith(".mjs") && !file.path.endsWith(".css"))) throw new Error("Browser assets must be embedded, not emitted as unserved files");
    const source = js.text + (css ? `\nexport const styles = ${JSON.stringify(css.text)};\n` : "");
    return {contents: `export default ${JSON.stringify(source)};`, loader: "js", watchFiles: Object.keys(browser.metafile.inputs)};
  });
}}]});