export interface GitTreeNode {
  path: string;
  mode: string;
  type: 'tree' | 'blob';
  sha: string;
  size?: number;
  url: string;
}

export interface GitTreeResponse {
  sha: string;
  url: string;
  tree: GitTreeNode[];
  truncated: boolean;
}

export const githubService = {
  /**
   * Fetch the full recursive file tree for a repository at a specific commit.
   */
  async fetchTree(repoFullName: string, commitHash: string): Promise<GitTreeNode[]> {
    const response = await fetch(`https://api.github.com/repos/${repoFullName}/git/trees/${commitHash}?recursive=1`);
    if (!response.ok) {
      throw new Error(`Failed to fetch tree: ${response.statusText}`);
    }
    const data: GitTreeResponse = await response.json();
    return data.tree;
  },

  /**
   * Fetch the raw content of a specific file at a specific commit.
   */
  async fetchFileContent(repoFullName: string, commitHash: string, filePath: string): Promise<string> {
    const response = await fetch(`https://raw.githubusercontent.com/${repoFullName}/${commitHash}/${filePath}`);
    if (!response.ok) {
      throw new Error(`Failed to fetch file content: ${response.statusText}`);
    }
    return await response.text();
  }
};