#!/usr/bin/env python3
"""
Database initialization script for TimeTracker
This script checks if the database is connected and initialized,
and initializes it if needed.
"""

import os
import sys
import time
import traceback
from sqlalchemy import create_engine, text, inspect
from sqlalchemy.exc import OperationalError, ProgrammingError

def wait_for_database(url, max_attempts=30, delay=2):
    """Wait for database to be ready"""
    print(f"Waiting for database to be ready...")
    
    for attempt in range(max_attempts):
        try:
            engine = create_engine(url, pool_pre_ping=True)
            with engine.connect() as conn:
                conn.execute(text("SELECT 1"))
            print("Database connection established successfully")
            return engine
        except Exception as e:
            print(f"Waiting for database... (attempt {attempt+1}/{max_attempts}): {e}")
            if attempt < max_attempts - 1:
                time.sleep(delay)
            else:
                print("Database not ready after waiting, exiting...")
                sys.exit(1)
    
    return None

def check_database_initialization(engine):
    """Check if database is initialized by looking for required tables"""
    print("Checking if database is initialized...")
    
    try:
        inspector = inspect(engine)
        
        # Check if our main tables exist
        existing_tables = inspector.get_table_names()
        required_tables = ['users', 'projects', 'time_entries', 'settings']
        
        missing_tables = [table for table in required_tables if table not in existing_tables]
        
        if missing_tables:
            print(f"Database not fully initialized. Missing tables: {missing_tables}")
            return False
        else:
            print("Database is already initialized with all required tables")
            return True
            
    except Exception as e:
        print(f"Error checking database initialization: {e}")
        print(f"Traceback: {traceback.format_exc()}")
        return False

def initialize_database(engine):
    """Initialize database using Flask CLI command"""
    print("Initializing database...")
    
    try:
        # Set environment variables for Flask
        os.environ['FLASK_APP'] = 'app'
        os.environ['FLASK_ENV'] = 'production'
        
        print("Importing Flask app...")
        
        # Import Flask app and initialize database
        from app import create_app, db
        from app.models import User, Project, TimeEntry, Settings
        
        print("Creating Flask app...")
        app = create_app()
        
        print("Setting up app context...")
        with app.app_context():
            print("Creating all tables...")
            # Create all tables
            db.create_all()
            
            print("Verifying tables were created...")
            # Verify tables were created
            inspector = inspect(engine)
            existing_tables = inspector.get_table_names()
            print(f"Tables after creation: {existing_tables}")
            
            # Create default admin user if it doesn't exist
            admin_username = os.getenv('ADMIN_USERNAMES', 'admin').split(',')[0]
            print(f"Checking for admin user: {admin_username}")
            
            if not User.query.filter_by(username=admin_username).first():
                print("Creating admin user...")
                admin_user = User(
                    username=admin_username,
                    role='admin'
                )
                admin_user.is_active = True
                db.session.add(admin_user)
                db.session.commit()
                print(f"Created default admin user: {admin_username}")
            else:
                print(f"Admin user {admin_username} already exists")
            
            # Create default settings if they don't exist
            print("Checking for default settings...")
            if not Settings.query.first():
                print("Creating default settings...")
                settings = Settings()
                db.session.add(settings)
                db.session.commit()
                print("Created default settings")
            else:
                print("Default settings already exist")
            
            # Create default project if it doesn't exist
            print("Checking for default project...")
            if not Project.query.first():
                print("Creating default project...")
                project = Project(
                    name='General',
                    client='Default Client',
                    description='Default project for general tasks',
                    billable=True,
                    status='active'
                )
                db.session.add(project)
                db.session.commit()
                print("Created default project")
            else:
                print("Default project already exists")
            
            print("Database initialized successfully")
            return True
            
    except Exception as e:
        print(f"Error initializing database: {e}")
        print(f"Traceback: {traceback.format_exc()}")
        return False

def main():
    """Main function"""
    url = os.getenv("DATABASE_URL", "")
    
    if not url.startswith("postgresql"):
        print("No PostgreSQL database configured, skipping initialization")
        return
    
    print(f"Database URL: {url}")
    
    # Wait for database to be ready
    engine = wait_for_database(url)
    
    # Check if database is initialized
    if not check_database_initialization(engine):
        # Initialize database
        if initialize_database(engine):
            print("Database initialization completed successfully")
            # Verify initialization worked
            if check_database_initialization(engine):
                print("Database verification successful")
            else:
                print("Database verification failed - tables still missing")
                sys.exit(1)
        else:
            print("Database initialization failed")
            sys.exit(1)
    else:
        print("Database already initialized, no action needed")

if __name__ == "__main__":
    main()