#!/usr/bin/env python3
"""
Scheduled newsletter sender that runs daily at 7 AM Berlin time
Waits for crawler to finish before sending to ensure fresh content
"""
import schedule
import time
from datetime import datetime, timedelta
import pytz
from pathlib import Path
import sys

# Add current directory to path
sys.path.insert(0, str(Path(__file__).parent))

from sender_service import send_newsletter, get_latest_articles, Config

# Berlin timezone
BERLIN_TZ = pytz.timezone('Europe/Berlin')

# Maximum time to wait for crawler (in minutes)
MAX_WAIT_TIME = 30

def check_crawler_finished():
    """
    Check if crawler has finished by looking for recent articles
    Returns: (bool, str) - (is_finished, message)
    """
    try:
        # Check if we have articles from today
        articles = get_latest_articles(max_articles=1, hours=2)
        
        if articles:
            # Check if the most recent article was crawled recently (within last 2 hours)
            latest_article = articles[0]
            crawled_at = latest_article.get('crawled_at')
            
            if crawled_at:
                time_since_crawl = datetime.utcnow() - crawled_at
                minutes_since = time_since_crawl.total_seconds() / 60
                
                if minutes_since < 120:  # Within last 2 hours
                    return True, f"Crawler finished {int(minutes_since)} minutes ago"
        
        return False, "No recent articles found"
        
    except Exception as e:
        return False, f"Error checking crawler status: {e}"


def wait_for_crawler(max_wait_minutes=30):
    """
    Wait for crawler to finish before sending newsletter
    
    Args:
        max_wait_minutes: Maximum time to wait in minutes
        
    Returns:
        bool: True if crawler finished, False if timeout
    """
    berlin_time = datetime.now(BERLIN_TZ)
    print(f"\n⏳ Waiting for crawler to finish...")
    print(f"   Current time: {berlin_time.strftime('%H:%M:%S %Z')}")
    print(f"   Max wait time: {max_wait_minutes} minutes")
    
    start_time = time.time()
    check_interval = 30  # Check every 30 seconds
    
    while True:
        elapsed_minutes = (time.time() - start_time) / 60
        
        # Check if crawler finished
        is_finished, message = check_crawler_finished()
        
        if is_finished:
            print(f"   ✓ {message}")
            return True
        
        # Check if we've exceeded max wait time
        if elapsed_minutes >= max_wait_minutes:
            print(f"   ⚠ Timeout after {max_wait_minutes} minutes")
            print(f"   Proceeding with available articles...")
            return False
        
        # Show progress
        remaining = max_wait_minutes - elapsed_minutes
        print(f"   ⏳ Still waiting... ({remaining:.1f} minutes remaining) - {message}")
        
        # Wait before next check
        time.sleep(check_interval)


def run_sender():
    """Run the newsletter sender with crawler coordination"""
    berlin_time = datetime.now(BERLIN_TZ)
    print(f"\n{'='*70}")
    print(f"📧 Scheduled newsletter sender started")
    print(f"   Time: {berlin_time.strftime('%Y-%m-%d %H:%M:%S %Z')}")
    print(f"{'='*70}\n")
    
    try:
        # Wait for crawler to finish (max 30 minutes)
        crawler_finished = wait_for_crawler(max_wait_minutes=MAX_WAIT_TIME)
        
        if not crawler_finished:
            print(f"\n⚠ Crawler may still be running, but proceeding anyway...")
        
        print(f"\n{'='*70}")
        print(f"📧 Starting newsletter send...")
        print(f"{'='*70}\n")
        
        # Send newsletter to all subscribers
        result = send_newsletter(max_articles=Config.MAX_ARTICLES)
        
        if result['success']:
            print(f"\n{'='*70}")
            print(f"✅ Newsletter sent successfully!")
            print(f"   Sent: {result['sent_count']}/{result['total_subscribers']}")
            print(f"   Articles: {result['article_count']}")
            print(f"   Failed: {result['failed_count']}")
            print(f"{'='*70}\n")
        else:
            print(f"\n{'='*70}")
            print(f"❌ Newsletter send failed: {result.get('error', 'Unknown error')}")
            print(f"{'='*70}\n")
        
    except Exception as e:
        print(f"\n{'='*70}")
        print(f"❌ Scheduled sender error: {e}")
        print(f"{'='*70}\n")
        import traceback
        traceback.print_exc()


def main():
    """Main scheduler loop"""
    print("📧 Munich News Newsletter Scheduler")
    print("="*70)
    print("Schedule: Daily at 7:00 AM Berlin time")
    print("Timezone: Europe/Berlin (CET/CEST)")
    print("Coordination: Waits for crawler to finish (max 30 min)")
    print("="*70)
    
    # Schedule the sender to run at 7 AM Berlin time
    schedule.every().day.at("07:00").do(run_sender)
    
    # Show next run time
    berlin_time = datetime.now(BERLIN_TZ)
    print(f"\nCurrent time (Berlin): {berlin_time.strftime('%Y-%m-%d %H:%M:%S %Z')}")
    
    # Get next scheduled run
    next_run = schedule.next_run()
    if next_run:
        # Convert to Berlin time for display
        next_run_berlin = next_run.astimezone(BERLIN_TZ)
        print(f"Next scheduled run: {next_run_berlin.strftime('%Y-%m-%d %H:%M:%S %Z')}")
    
    print("\n⏳ Scheduler is running... (Press Ctrl+C to stop)\n")
    
    # Optional: Run immediately on startup (comment out if you don't want this)
    # print("🚀 Running initial send on startup...")
    # run_sender()
    
    # Keep the scheduler running
    while True:
        schedule.run_pending()
        time.sleep(60)  # Check every minute


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        print("\n\n👋 Scheduler stopped by user")
    except Exception as e:
        print(f"\n\n❌ Scheduler error: {e}")
        import traceback
        traceback.print_exc()