import requests

def read_file(repo_url: str, file_path="README.md") -> str:
    try:
        # Extract owner and repo name
        parts = repo_url.rstrip("/").split("/")
        owner, repo = parts[-2], parts[-1]

        # Step 1: Get default branch
        repo_api_url = f"https://api.github.com/repos/{owner}/{repo}"
        repo_response = requests.get(repo_api_url)
        if repo_response.status_code != 200:
            return f"❌ Failed to fetch repo info. Status: {repo_response.status_code}"
        default_branch = repo_response.json().get("default_branch", "main")

        # Step 2: Fetch the file using GitHub Contents API
        api_url = f"https://api.github.com/repos/{owner}/{repo}/contents/{file_path}?ref={default_branch}"
        headers = {"Accept": "application/vnd.github.v3.raw"}
        response = requests.get(api_url, headers=headers)

        if response.status_code == 200:
            return response.text
        else:
            return f"❌ Could not retrieve `{file_path}`. Status code: {response.status_code}"
    except Exception as e:
        return f"❌ Error: {str(e)}"