export enum GitHubRefType {
  BRANCH = 'branch',
  TAG = 'tag',
}

export function parseGitHubUrl(githubUrl: string): {
  owner: string;
  repo: string;
} {
  const cleanUrl = githubUrl.replace(/\/$/, '').replace(/\.git$/, '');
  const parts = cleanUrl.split('/');

  if (parts.length < 5 || parts[2] !== 'github.com') {
    throw new Error(
      'Invalid GitHub URL format. Expected: https://github.com/owner/repo'
    );
  }

  return {
    owner: parts[3] as string,
    repo: parts[4] as string,
  };
}

export function createDownloadableGitHubUrl(
  githubUrl: string,
  ref: string = 'main',
  refType: GitHubRefType = GitHubRefType.BRANCH
): string {
  // Extract owner and repo from GitHub URL

  const { owner, repo } = parseGitHubUrl(githubUrl);

  const refPath = refType === GitHubRefType.BRANCH ? 'heads' : 'tags';

  return `https://github.com/${owner}/${repo}/archive/refs/${refPath}/${ref}.zip`;
}

export interface GitHubFileOptions {
  githubUrl: string;
  path: string;
  ref?: string; // branch, tag, or commit SHA
}

export function getVersionUrl(options: GitHubFileOptions): string {
  const { githubUrl, path, ref = 'main' } = options;

  // Extract owner and repo from GitHub URL
  const { owner, repo } = parseGitHubUrl(githubUrl);

  // GitHub raw content URL format
  const url = `https://raw.githubusercontent.com/${owner}/${repo}/${ref}/${path}`;
  return url;
}

/**
 * Creates GitHub OTA configuration URLs
 *
 * Note: The native implementations automatically check for both ota.version.json and ota.version files.
 * If you're using ota.version.json for version checking via URL, pass 'ota.version.json' as otaVersionPath.
 *
 * @param githubUrl - The GitHub repository URL
 * @param otaVersionPath - Path to the version file (defaults to 'ota.version', but 'ota.version.json' is also supported)
 * @param ref - The branch, tag, or commit SHA (defaults to 'main')
 */
export function githubOTA({
  githubUrl,
  otaVersionPath = 'ota.version',
  ref = 'main',
}: {
  githubUrl: string;
  otaVersionPath?: string;
  ref?: string;
}): {
  downloadUrl: string;
  versionUrl: string;
} {
  const downloadUrl = createDownloadableGitHubUrl(
    githubUrl,
    ref,
    GitHubRefType.BRANCH
  );
  const versionUrl = getVersionUrl({ githubUrl, path: otaVersionPath, ref });
  return { downloadUrl, versionUrl };
}