import {
  build,
  type Config,
  defineConfig,
  parse,
  type TokenNormalized,
} from "@terrazzo/parser";
import pluginCss from "@terrazzo/plugin-css";

export function prefixToken(token: TokenNormalized) {
  return `--morkdeck-${token.$type}-${token.id.replace(/\./g, "-")}`;
}

const configBase: Config = {
  plugins: [
    pluginCss({
      variableName: prefixToken,
      baseSelector: ":root",
    }),
  ],
};

export async function compileCss(themePath?: string) {
  const config = defineConfig(configBase, {
    cwd: new URL(import.meta.url),
  });

  const tokensUrl = new URL("./tokens", import.meta.url);
  const files: Array<{ src: string; filename: URL }> = [];
  const tokenSources = Deno.readDir(tokensUrl);
  for await (const source of tokenSources) {
    if (source.isFile) {
      const filename = new URL(`tokens/${source.name}`, tokensUrl);
      files.push({
        filename,
        src: await Deno.readTextFile(filename),
      });
    }
  }

  if (themePath) {
    const themeUrl = new URL(themePath, Deno.cwd());
    files.push({
      filename: new URL(themePath, Deno.cwd()),
      src: await Deno.readTextFile(themeUrl),
    });
  }

  const { tokens, sources } = await parse(files, { config });
  const buildResult = await build(tokens, { sources, config });

  return buildResult.outputFiles.map((f) => f.contents).join("\n\n");
}