"""
YouTube Video Import Script
Parses youtube.md and links videos to Performance and Show entities.
"""
import json
import re
from datetime import datetime
from sqlmodel import Session, select
from database import engine
from models import Performance, Show, Song

# Construct YouTube embed URL from videoId
def make_youtube_url(video_id: str) -> str:
    return f"https://www.youtube.com/watch?v={video_id}"

def parse_youtube_md(filepath: str) -> list:
    """Extract JSON array from youtube.md markdown file."""
    with open(filepath, 'r') as f:
        content = f.read()
    
    # Parse line-by-line looking for JSON objects
    # This handles the escaped markdown format in the source file
    videos = []
    in_json = False
    
    for line in content.split('\n'):
        line = line.strip()
        
        # Detect start of JSON block (with or without escapes)
        if 'json' in line.lower() and ('`' in line or '\\' in line):
            in_json = True
            continue
        
        # Skip array markers
        if line in ['[', '\\[', ']']:
            continue
            
        # Process JSON objects
        if in_json and line.startswith('{'):
            # Clean the line
            clean_line = line.rstrip(',').rstrip()
            # Remove trailing markdown escapes
            clean_line = clean_line.replace('\\_', '_').replace('\\-', '-')
            
            if clean_line.endswith('}'):
                try:
                    obj = json.loads(clean_line)
                    videos.append(obj)
                except json.JSONDecodeError as e:
                    print(f"Parse error on line: {clean_line[:50]}... - {e}")
    
    return videos

def normalize_title(title: str) -> str:
    """Normalize song title for matching."""
    return title.strip().lower()

def import_videos(videos: list):
    """Import video links into the database."""
    stats = {
        'songs_matched': 0,
        'songs_not_found': 0,
        'sequences_processed': 0,
        'full_shows_matched': 0,
        'full_shows_not_found': 0,
        'skipped': 0
    }
    
    with Session(engine) as session:
        for video in videos:
            video_id = video.get('videoId')
            title = video.get('title', '')
            video_type = video.get('type', 'song')
            date_str = video.get('date')
            youtube_url = make_youtube_url(video_id)
            
            if video_type == 'documentary':
                print(f"[SKIP] Documentary: {title}")
                stats['skipped'] += 1
                continue
            
            if video_type == 'visualizer':
                print(f"[SKIP] Visualizer: {title}")
                stats['skipped'] += 1
                continue
            
            if video_type == 'session':
                print(f"[SKIP] Session: {title}")
                stats['skipped'] += 1
                continue
            
            if video_type == 'full_show':
                # Match by date or event name
                event_name = video.get('event')
                if date_str:
                    show_date = datetime.strptime(date_str, '%Y-%m-%d')
                    statement = select(Show).where(Show.date == show_date)
                    show = session.exec(statement).first()
                    if show:
                        show.youtube_link = youtube_url
                        session.add(show)
                        print(f"[FULL SHOW] Linked: {title} -> Show ID {show.id}")
                        stats['full_shows_matched'] += 1
                    else:
                        print(f"[FULL SHOW NOT FOUND] {title} (date: {date_str})")
                        stats['full_shows_not_found'] += 1
                else:
                    print(f"[FULL SHOW SKIP] No date for: {title}")
                    stats['skipped'] += 1
                continue
            
            # Parse date
            if not date_str:
                print(f"[SKIP] No date: {title}")
                stats['skipped'] += 1
                continue
            
            try:
                show_date = datetime.strptime(date_str, '%Y-%m-%d')
            except ValueError:
                print(f"[SKIP] Invalid date format: {date_str}")
                stats['skipped'] += 1
                continue
            
            # Find show by date
            show_statement = select(Show).where(Show.date == show_date)
            show = session.exec(show_statement).first()
            if not show:
                print(f"[SHOW NOT FOUND] Date: {date_str} for video: {title}")
                stats['songs_not_found'] += 1
                continue
            
            # Handle sequences (multiple songs)
            if video_type == 'sequence' or '→' in title:
                song_titles = [s.strip() for s in title.split('→')]
                matched_any = False
                
                for song_title in song_titles:
                    # Find song by title
                    song_statement = select(Song).where(Song.title.ilike(f"%{song_title}%"))
                    songs = session.exec(song_statement).all()
                    
                    for song in songs:
                        # Find performance for this song on this show
                        perf_statement = select(Performance).where(
                            Performance.show_id == show.id,
                            Performance.song_id == song.id
                        )
                        perf = session.exec(perf_statement).first()
                        if perf:
                            perf.youtube_link = youtube_url
                            session.add(perf)
                            print(f"[SEQUENCE] Linked: {song_title} -> Performance ID {perf.id}")
                            matched_any = True
                
                if matched_any:
                    stats['sequences_processed'] += 1
                else:
                    print(f"[SEQUENCE NOT FOUND] {title} on {date_str}")
                    stats['songs_not_found'] += 1
                continue
            
            # Single song
            song_statement = select(Song).where(Song.title.ilike(f"%{title}%"))
            songs = session.exec(song_statement).all()
            
            matched = False
            for song in songs:
                perf_statement = select(Performance).where(
                    Performance.show_id == show.id,
                    Performance.song_id == song.id
                )
                perf = session.exec(perf_statement).first()
                if perf:
                    perf.youtube_link = youtube_url
                    session.add(perf)
                    print(f"[SONG] Linked: {title} -> Performance ID {perf.id}")
                    stats['songs_matched'] += 1
                    matched = True
                    break
            
            if not matched:
                print(f"[SONG NOT FOUND] {title} on {date_str}")
                stats['songs_not_found'] += 1
        
        session.commit()
    
    print("\n=== Import Summary ===")
    for key, value in stats.items():
        print(f"  {key}: {value}")

if __name__ == "__main__":
    import sys
    
    filepath = sys.argv[1] if len(sys.argv) > 1 else "../youtube.md"
    print(f"Parsing YouTube data from: {filepath}")
    
    videos = parse_youtube_md(filepath)
    print(f"Found {len(videos)} videos")
    
    if videos:
        import_videos(videos)