import requests
import sys
import re
from datetime import datetime
import argparse


def get_github_issue(issue_url):
    # Extract owner, repo, and issue number from URL
    pattern = r"https://github\.com/([^/]+)/([^/]+)/issues/(\d+)"
    match = re.match(pattern, issue_url)
    if not match:
        raise ValueError("Invalid GitHub issue URL format")

    owner, repo, issue_number = match.groups()

    # GitHub API endpoints
    api_base = f"https://api.github.com/repos/{owner}/{repo}"
    headers = {
        "Accept": "application/vnd.github.v3+json",
        # If you have a token:
        # "Authorization": "Bearer YOUR_GITHUB_TOKEN"
    }

    # Get issue details
    issue_response = requests.get(f"{api_base}/issues/{issue_number}", headers=headers)
    if issue_response.status_code != 200:
        raise Exception(f"Failed to fetch issue: {issue_response.status_code}")

    issue = issue_response.json()

    # Get comments
    comments_response = requests.get(f"{api_base}/issues/{issue_number}/comments", headers=headers)
    if comments_response.status_code != 200:
        raise Exception(f"Failed to fetch comments: {comments_response.status_code}")

    comments = comments_response.json()

    # Format the markdown content
    markdown_content = []

    # Add issue title
    markdown_content.append(f"# {issue['title']}\n")

    # Add issue author
    markdown_content.append(f"*Posted by @{issue['user']['login']}*\n")

    # Add issue body
    markdown_content.append(issue["body"])
    markdown_content.append("\n---\n")

    # Add comments
    for comment in comments:
        markdown_content.append(f"\n### Comment by @{comment['user']['login']}\n")
        markdown_content.append(comment["body"])
        markdown_content.append("\n---\n")

    return "\n".join(markdown_content)


def main():
    parser = argparse.ArgumentParser(description="Download GitHub issue as markdown")
    parser.add_argument("issue_url", help="Full GitHub issue URL")
    parser.add_argument("--output", "-o", help="Output file path (optional)")
    args = parser.parse_args()

    try:
        markdown_content = get_github_issue(args.issue_url)

        # Determine output filename
        if args.output:
            output_file = args.output
        else:
            # Extract issue number for default filename
            issue_number = re.search(r"/issues/(\d+)", args.issue_url).group(1)
            output_file = f"issue-{issue_number}.md"

        # Write to file
        with open(output_file, "w", encoding="utf-8") as f:
            f.write(markdown_content)

        print(f"Successfully downloaded issue to {output_file}")

    except Exception as e:
        print(f"Error: {str(e)}", file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()