import os
import requests
from collections import defaultdict
from datetime import datetime
from dotenv import load_dotenv

# Load environment variables from .env file
load_dotenv()

# GitHub API configuration
GITHUB_API_URL = "https://api.github.com"
REPO_OWNER = os.getenv("GITHUB_REPO_OWNER")
REPO_NAME = os.getenv("GITHUB_REPO_NAME")
TOKEN = os.getenv("GITHUB_TOKEN")

headers = {
    "Authorization": f"token {TOKEN}",
    "Accept": "application/vnd.github.v3+json"
}

def get_issues(state="open"):
    issues = []
    page = 1
    while True:
        response = requests.get(
            f"{GITHUB_API_URL}/repos/{REPO_OWNER}/{REPO_NAME}/issues",
            headers=headers,
            params={"state": state, "page": page, "per_page": 100}
        )
        response.raise_for_status()
        page_issues = response.json()
        if not page_issues:
            break
        issues.extend(page_issues)
        page += 1
    return issues

def group_issues_by_subject(issues):
    grouped_issues = defaultdict(list)
    for issue in issues:
        subject = issue['title'].split(':')[0].strip()  # Assuming subject is before the first colon
        grouped_issues[subject].append(issue)
    return grouped_issues

def find_oldest_issue(subject):
    all_issues = get_issues("all")
    oldest_issue = None
    oldest_date = datetime.now()
    
    for issue in all_issues:
        if issue['title'].split(':')[0].strip() == subject:
            created_at = datetime.strptime(issue['created_at'], "%Y-%m-%dT%H:%M:%SZ")
            if created_at < oldest_date:
                oldest_date = created_at
                oldest_issue = issue
    
    return oldest_issue

def main():
    if not all([REPO_OWNER, REPO_NAME, TOKEN]):
        print("Error: Missing environment variables. Please check your .env file.")
        return

    open_issues = get_issues()
    grouped_open_issues = group_issues_by_subject(open_issues)
    
    for subject, issues in grouped_open_issues.items():
        print(f"\nSubject: {subject}")
        print(f"Open issues: {len(issues)}")
        for issue in issues:
            print(f"  - #{issue['number']}: {issue['title']}")
        
        oldest_issue = find_oldest_issue(subject)
        if oldest_issue:
            print(f"Oldest issue: #{oldest_issue['number']} (created on {oldest_issue['created_at']})")
        else:
            print("No oldest issue found")

if __name__ == "__main__":
    main()