import { ManifestModuleUtil, type ManifestRoot, type Package } from '@travetto/manifest';

/**
 * Standard utilities for compiler
 */
export class CompilerUtil {
  /**
   * Rewrites the package.json to target output file names, and pins versions
   * @param manifest
   * @param file
   * @param text
   * @returns
   */
  static rewritePackageJSON(manifest: ManifestRoot, text: string): string {
    const pkg: Package = JSON.parse(text);
    if (pkg.files) {
      pkg.files = pkg.files.map(file => ManifestModuleUtil.withOutputExtension(file));
    }
    if (pkg.main) {
      pkg.main = ManifestModuleUtil.withOutputExtension(pkg.main);
    }
    pkg.type = 'module';
    for (const key of ['devDependencies', 'dependencies', 'peerDependencies'] as const) {
      if (key in pkg) {
        for (const dependency of Object.keys(pkg[key] ?? {})) {
          if (dependency in manifest.modules) {
            pkg[key]![dependency] = manifest.modules[dependency].version;
          }
        }
      }
    }
    return JSON.stringify(pkg, null, 2);
  }

  /**
   * Naive hashing
   */
  static naiveHash(text: string): number {
    let hash = 5381;

    for (let i = 0; i < text.length; i += 1) {
      hash = (hash * 33) ^ text.charCodeAt(i);
    }

    return Math.abs(hash);
  }
}