/// Abstract interface for reading/writing vault files on a git host.
///
/// Both Gitea and GitHub expose a "repo contents" REST API that lets us
/// read, write, and delete individual files without cloning the repo.
/// This interface captures just the operations the vault needs.

export interface GitHost {
  /// Read a single file from the repo, returning its raw bytes.
  readFile(path: string): Promise<Uint8Array>;

  /// Create or update a file in the repo with a commit message.
  writeFile(path: string, content: Uint8Array, message: string): Promise<void>;

  /// Delete a file from the repo with a commit message.
  deleteFile(path: string, message: string): Promise<void>;

  /// List file names in a directory (non-recursive).
  listDir(path: string): Promise<string[]>;
}

/// Convert a Uint8Array to a base64 string (works in service worker context).
export function uint8ArrayToBase64(bytes: Uint8Array): string {
  let binary = '';
  for (let i = 0; i < bytes.length; i++) {
    binary += String.fromCharCode(bytes[i]);
  }
  return btoa(binary);
}

/// Convert a base64 string to a Uint8Array.
export function base64ToUint8Array(base64: string): Uint8Array {
  const binary = atob(base64);
  const bytes = new Uint8Array(binary.length);
  for (let i = 0; i < binary.length; i++) {
    bytes[i] = binary.charCodeAt(i);
  }
  return bytes;
}

/// Factory function that returns the appropriate GitHost implementation.
import { GiteaHost } from './gitea';
import { GitHubHost } from './github';

export function createGitHost(
  hostType: 'gitea' | 'github',
  hostUrl: string,
  repoPath: string,
  apiToken: string,
): GitHost {
  if (hostType === 'gitea') {
    return new GiteaHost(hostUrl, repoPath, apiToken);
  }
  return new GitHubHost(repoPath, apiToken);
}