"""
Simple SQLite Schema Verification

This script checks if the SQLite fallback database has the required tables.
"""

import asyncio
import logging
import sys
from pathlib import Path

# Add the backend directory to Python path
backend_dir = Path(__file__).parent
sys.path.insert(0, str(backend_dir))

from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import text

# Setup logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)


async def check_sqlite_schema():
    """Check SQLite database schema."""
    print("🔍 SQLite Fallback Database Schema Check")
    print("=" * 50)
    
    try:
        # Import database components
        from core.config import settings
        from core.fallback_database import check_fallback_health, get_fallback_db
        
        print(f"SQLite Fallback Enabled: {settings.ENABLE_SQLITE_FALLBACK}")
        print(f"SQLite Database Path: {settings.SQLITE_DATABASE_PATH}")
        
        # Check if fallback is available
        if not await check_fallback_health():
            print("❌ SQLite fallback database is not available")
            return False
        
        print("✅ SQLite fallback database is available")
        
        # Get tables from SQLite
        async for session in get_fallback_db():
            result = await session.execute(text("""
                SELECT name FROM sqlite_master 
                WHERE type='table' 
                AND name NOT LIKE 'sqlite_%'
                ORDER BY name
            """))
            
            tables = result.fetchall()
            table_names = [table[0] for table in tables]
            
            print(f"\n📋 Found {len(table_names)} tables in SQLite:")
            for table_name in table_names:
                print(f"   - {table_name}")
            break
            
            # Expected tables based on models
            expected_tables = {
                'users', 'evaluations', 'api_keys', 'roles', 'permissions',
                'user_roles'  # Junction table for many-to-many relationship
            }
            
            print(f"\n📊 Expected tables: {len(expected_tables)}")
            for table in expected_tables:
                status = "✅" if table in table_names else "❌"
                print(f"   {status} {table}")
            
            # Check for missing tables
            missing_tables = expected_tables - set(table_names)
            extra_tables = set(table_names) - expected_tables
            
            if missing_tables:
                print(f"\n❌ Missing tables: {missing_tables}")
                return False
            else:
                print(f"\n✅ All required tables present!")
            
            if extra_tables:
                print(f"ℹ️  Extra tables: {extra_tables}")
            
            # Get detailed schema for each table
            print(f"\n🔍 Detailed Schema:")
            for table_name in table_names:
                if table_name in expected_tables:
                    print(f"\n📝 Table: {table_name}")
                    
                    # Get columns
                    columns_result = await session.execute(text(f"PRAGMA table_info({table_name})"))
                    columns = columns_result.fetchall()
                    
                    for col in columns:
                        nullable = "NULL" if col[3] == 1 else "NOT NULL"
                        pk = " (PK)" if col[5] == 1 else ""
                        print(f"   - {col[1]}: {col[2]} {nullable}{pk}")
            
            return True
            
    except Exception as e:
        print(f"❌ Error checking schema: {e}")
        logger.error(f"Schema check failed: {e}")
        return False


async def main():
    """Main function."""
    success = await check_sqlite_schema()
    
    print("\n" + "=" * 50)
    if success:
        print("🎉 SQLite schema verification PASSED")
        print("   All required tables are present in the fallback database!")
    else:
        print("❌ SQLite schema verification FAILED")
        print("   Some issues were detected with the fallback database.")
    print("=" * 50)
    
    return 0 if success else 1


if __name__ == "__main__":
    exit_code = asyncio.run(main())
    exit(exit_code)