#!/usr/bin/env python3
"""
Apply SQL migration to existing database
Usage: python apply_migration.py
"""

import sqlite3
import os

# Database path
DB_PATH = os.path.join(os.path.dirname(__file__), "data", "data.db")
MIGRATION_PATH = os.path.join(os.path.dirname(__file__), "migrations", "001_add_ram_stats_and_smart.sql")

def apply_migration():
    """Apply the SQL migration"""

    if not os.path.exists(DB_PATH):
        print(f"❌ Database not found at {DB_PATH}")
        print("   The database will be created automatically on first run.")
        return

    if not os.path.exists(MIGRATION_PATH):
        print(f"❌ Migration file not found at {MIGRATION_PATH}")
        return

    print(f"📂 Database: {DB_PATH}")
    print(f"📄 Migration: {MIGRATION_PATH}")
    print()

    # Read migration SQL
    with open(MIGRATION_PATH, 'r') as f:
        migration_sql = f.read()

    # Connect to database
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()

    try:
        # Check if columns already exist
        cursor.execute("PRAGMA table_info(hardware_snapshots)")
        columns = [row[1] for row in cursor.fetchall()]

        if 'ram_used_mb' in columns:
            print("⚠️  Migration already applied (ram_used_mb column exists)")

            # Check if disk_smart_data table exists
            cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='disk_smart_data'")
            if cursor.fetchone():
                print("⚠️  disk_smart_data table already exists")
                print("✅ Database is up to date")
                return

        # Apply migration
        print("🔄 Applying migration...")
        cursor.executescript(migration_sql)
        conn.commit()

        print("✅ Migration applied successfully!")
        print()
        print("New columns added to hardware_snapshots:")
        print("  - ram_used_mb")
        print("  - ram_free_mb")
        print("  - ram_shared_mb")
        print()
        print("New table created:")
        print("  - disk_smart_data")

    except sqlite3.Error as e:
        print(f"❌ Error applying migration: {e}")
        conn.rollback()
    finally:
        conn.close()

if __name__ == "__main__":
    apply_migration()