#!/usr/bin/env python3
"""
Force schema update script for TimeTracker
This script forces the addition of missing columns to existing tables
"""

import os
import sys
import time
from sqlalchemy import create_engine, text, inspect

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 force_schema_update(engine):
    """Force update the database schema"""
    print("Forcing schema update...")
    
    try:
        inspector = inspect(engine)
        existing_tables = inspector.get_table_names()
        
        # Check if tasks table exists
        if 'tasks' not in existing_tables:
            print("Creating tasks table...")
            create_tasks_sql = """
            CREATE TABLE tasks (
                id SERIAL PRIMARY KEY,
                project_id INTEGER REFERENCES projects(id) ON DELETE CASCADE NOT NULL,
                name VARCHAR(200) NOT NULL,
                description TEXT,
                status VARCHAR(20) DEFAULT 'pending' NOT NULL,
                priority VARCHAR(20) DEFAULT 'medium' NOT NULL,
                assigned_to INTEGER REFERENCES users(id),
                created_by INTEGER REFERENCES users(id) NOT NULL,
                due_date DATE,
                estimated_hours NUMERIC(5,2),
                actual_hours NUMERIC(5,2),
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL
            );
            """
            
            with engine.connect() as conn:
                conn.execute(text(create_tasks_sql))
                conn.commit()
            print("✓ Tasks table created successfully")
        else:
            print("✓ Tasks table already exists")
        
        # Check if time_entries table exists and has task_id column
        if 'time_entries' in existing_tables:
            time_entries_columns = [col['name'] for col in inspector.get_columns('time_entries')]
            
            if 'task_id' not in time_entries_columns:
                print("Adding task_id column to time_entries table...")
                add_column_sql = """
                ALTER TABLE time_entries 
                ADD COLUMN task_id INTEGER;
                """
                
                with engine.connect() as conn:
                    conn.execute(text(add_column_sql))
                    conn.commit()
                print("✓ task_id column added to time_entries table")
            else:
                print("✓ task_id column already exists in time_entries table")
        else:
            print("⚠ Warning: time_entries table does not exist")
        
        print("✓ Schema update completed successfully")
        return True
        
    except Exception as e:
        print(f"✗ Error updating schema: {e}")
        import traceback
        traceback.print_exc()
        return False

def main():
    """Main function"""
    url = os.getenv("DATABASE_URL", "")
    
    if not url.startswith("postgresql"):
        print("No PostgreSQL database configured, skipping schema update")
        return
    
    print(f"Database URL: {url}")
    
    # Wait for database to be ready
    engine = wait_for_database(url)
    
    # Force schema update
    if force_schema_update(engine):
        print("Schema update completed successfully")
        sys.exit(0)
    else:
        print("Schema update failed")
        sys.exit(1)

if __name__ == "__main__":
    main()