import type { MetroConfig } from 'metro-config';
import { withUniwindConfig } from 'uniwind/metro';

export interface ForgeMetroConfigOptions {
  /** Path to the CSS entry file (e.g., `'./global.css'`). */
  cssEntryFile: string;
  /** Path where generated Tailwind class type definitions are written. */
  generatedTypesFile?: string;
}

/**
 * Wraps a Metro config with Forge UI's styling-layer configuration.
 *
 * Today this delegates to Uniwind. If the styling layer is swapped (see
 * `docs/research/uniwind-to-nativewind-contingency.md`), only the internals
 * of this function change — consuming Metro configs stay the same.
 *
 * Must be the **outermost** Metro config wrapper (after any other wrappers
 * like `withStorybook`).
 */
export function withForgeMetroConfig<T extends MetroConfig>(
  config: T,
  options: ForgeMetroConfigOptions,
): T {
  return withUniwindConfig(config, {
    cssEntryFile: options.cssEntryFile,
    dtsFile: options.generatedTypesFile,
  }) as T;
}