#!/usr/bin/env python3
"""
Create default admin user for the platform.

Usage:
    python scripts/create_admin.py

This script:
- Creates a default admin user if one doesn't exist
- Can be run multiple times safely (idempotent)
- Should be run AFTER database migrations
"""

import sys
from pathlib import Path

# Add project root to path
project_root = Path(__file__).parent.parent
sys.path.insert(0, str(project_root))

from sqlalchemy.orm import Session
from sqlalchemy import select

from app.core.database import SessionLocal, engine
from models.database.user import User
from middleware.auth import AuthManager

# Default admin credentials
DEFAULT_ADMIN_EMAIL = "admin@platform.com"
DEFAULT_ADMIN_USERNAME = "admin"
DEFAULT_ADMIN_PASSWORD = "admin123"  # Change this in production!


def create_admin_user(db: Session) -> bool:
    """
    Create default admin user if it doesn't exist.

    Args:
        db: Database session

    Returns:
        bool: True if user was created, False if already exists
    """
    auth_manager = AuthManager()

    # Check if admin user already exists
    existing_admin = db.execute(
        select(User).where(User.username == DEFAULT_ADMIN_USERNAME)
    ).scalar_one_or_none()

    if existing_admin:
        print(f"ℹ️  Admin user '{DEFAULT_ADMIN_USERNAME}' already exists")
        print(f"   Email: {existing_admin.email}")
        print(f"   Role: {existing_admin.role}")
        print(f"   Active: {existing_admin.is_active}")
        return False

    # Create new admin user
    print(f"📝 Creating admin user...")

    admin_user = User(
        email=DEFAULT_ADMIN_EMAIL,
        username=DEFAULT_ADMIN_USERNAME,
        hashed_password=auth_manager.hash_password(DEFAULT_ADMIN_PASSWORD),
        role="admin",
        is_active=True
    )

    db.add(admin_user)
    db.commit()
    db.refresh(admin_user)

    print("\n✅ Admin user created successfully!")
    print("\n" + "=" * 50)
    print("  Admin Credentials:")
    print("=" * 50)
    print(f"  Email:    {DEFAULT_ADMIN_EMAIL}")
    print(f"  Username: {DEFAULT_ADMIN_USERNAME}")
    print(f"  Password: {DEFAULT_ADMIN_PASSWORD}")
    print("=" * 50)
    print("\n⚠️  IMPORTANT: Change the password after first login!")
    print(f"   Login at: http://localhost:8000/static/admin/login.html")
    print()

    return True


def verify_database_ready() -> bool:
    """
    Verify that database tables exist.

    Returns:
        bool: True if database is ready, False otherwise
    """
    try:
        # Try to query the users table
        with engine.connect() as conn:
            from sqlalchemy import text
            result = conn.execute(
                text("SELECT name FROM sqlite_master WHERE type='table' AND name='users'")
            )
            tables = result.fetchall()
            return len(tables) > 0
    except Exception as e:
        print(f"❌ Error checking database: {e}")
        return False


def main():
    """Main function to create admin user."""

    print("\n" + "=" * 50)
    print("  Admin User Creation Script")
    print("=" * 50 + "\n")

    # Step 1: Verify database is ready
    print("1️⃣  Checking database...")

    if not verify_database_ready():
        print("\n❌ ERROR: Database not ready!")
        print("\n   The 'users' table doesn't exist yet.")
        print("   Please run database migrations first:")
        print()
        print("   alembic upgrade head")
        print()
        print("   Or if using make:")
        print("   make migrate-up")
        print()
        sys.exit(1)

    print("   ✓ Database is ready")

    # Step 2: Create admin user
    print("\n2️⃣  Creating admin user...")

    db = SessionLocal()
    try:
        created = create_admin_user(db)

        if created:
            print("\n🎉 Setup complete! You can now:")
            print("   1. Start the server: uvicorn main:app --reload")
            print("   2. Login at: http://localhost:8000/static/admin/login.html")
            print()
        else:
            print("\n✓ No changes needed - admin user already exists")
            print()

        sys.exit(0)

    except Exception as e:
        print(f"\n❌ ERROR: Failed to create admin user")
        print(f"   {type(e).__name__}: {e}")
        print()
        print("   Common issues:")
        print("   - Database migrations not run")
        print("   - Database connection issues")
        print("   - Permissions problems")
        print()
        sys.exit(1)

    finally:
        db.close()


if __name__ == "__main__":
    main()