#!/usr/bin/env python3
"""
Complete application reset script
Removes database, clears cache files, and reinitializes everything
"""
import os
import sys
import shutil
import logging
import importlib
from pathlib import Path

# Configure logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
logger = logging.getLogger("app-reset")

# Application paths
DB_FILES = ["app.db", "instance/app.db"]
UPLOADS_FOLDER = "uploads"
PYCACHE_PATTERN = "**/__pycache__"

def confirm_reset():
    """Get user confirmation before proceeding"""
    print("\n⚠️  WARNING: This will completely reset the application ⚠️")
    print("📢 All data will be lost, including:")
    print("   - Database and all its tables")
    print("   - All uploaded files")
    print("   - Cache files and temporary data")
    print("\nAre you absolutely sure you want to continue?")
    return input("Type 'yes' to confirm: ").lower() == 'yes'

def remove_database_files():
    """Remove all database files"""
    success = True
    for db_file in DB_FILES:
        if os.path.exists(db_file):
            try:
                logger.info(f"Removing database file: {db_file}")
                os.remove(db_file)
            except Exception as e:
                logger.error(f"Failed to remove {db_file}: {e}")
                success = False
    return success

def clear_uploads_directory():
    """Clear all uploaded files but keep the directory"""
    if not os.path.exists(UPLOADS_FOLDER):
        logger.info(f"Creating uploads folder: {UPLOADS_FOLDER}")
        os.makedirs(UPLOADS_FOLDER, exist_ok=True)
        return True
    
    try:
        logger.info(f"Clearing uploads folder: {UPLOADS_FOLDER}")
        for item in os.listdir(UPLOADS_FOLDER):
            path = os.path.join(UPLOADS_FOLDER, item)
            if os.path.isfile(path):
                os.remove(path)
            elif os.path.isdir(path):
                shutil.rmtree(path)
        return True
    except Exception as e:
        logger.error(f"Failed to clear uploads directory: {e}")
        return False

def clear_pycache_files():
    """Clear all __pycache__ directories"""
    try:
        logger.info("Clearing Python cache files...")
        count = 0
        for cache_dir in Path('.').glob(PYCACHE_PATTERN):
            if cache_dir.is_dir():
                shutil.rmtree(cache_dir)
                count += 1
        
        logger.info(f"Removed {count} __pycache__ directories")
        return True
    except Exception as e:
        logger.error(f"Failed to clear cache files: {e}")
        return False

def initialize_application(create_admin=False):
    """Initialize the application with fresh database"""
    try:
        logger.info("Initializing Flask application...")
        # Force reload the app module
        if 'app' in sys.modules:
            importlib.reload(sys.modules['app'])
        
        # Import and create app
        from app import create_app, db
        app = create_app()
        
        with app.app_context():
            logger.info("Creating database tables...")
            db.create_all()
            
            # Create admin user if requested
            if create_admin:
                from app.models import User, Share
                if User.query.filter_by(username='admin').first() is None:
                    admin = User(username='admin', email='admin@example.com', is_admin=True)
                    admin.password = 'adminpassword'
                    db.session.add(admin)
                    db.session.commit()
                    logger.info("Created admin user (username: admin, password: adminpassword)")
                else:
                    logger.info("Admin user already exists")
            else:
                logger.info("Skipping admin user creation as requested")
        
        logger.info("Application initialized successfully")
        return True
    except Exception as e:
        logger.error(f"Failed to initialize application: {e}")
        return False

def main():
    """Main reset procedure"""
    print("\n🔄 Flask Files Application Reset Tool 🔄\n")
    
    if not confirm_reset():
        print("\n❌ Reset cancelled by user")
        return False
    
    create_admin = input("\nCreate admin user? (yes/no): ").lower() == 'yes'
    
    print("\n🚀 Starting reset process...\n")
    
    # Step 1: Remove database files
    if remove_database_files():
        logger.info("✅ Database files removed successfully")
    else:
        logger.error("❌ Failed to remove some database files")
    
    # Step 2: Clear uploads directory
    if clear_uploads_directory():
        logger.info("✅ Uploads directory cleared successfully")
    else:
        logger.error("❌ Failed to clear uploads directory")
    
    # Step 3: Clear cache files
    if clear_pycache_files():
        logger.info("✅ Python cache files cleared successfully")
    else:
        logger.error("❌ Failed to clear cache files")
    
    # Step 4: Initialize application
    if initialize_application(create_admin):
        logger.info("✅ Application initialized successfully")
    else:
        logger.error("❌ Failed to initialize application")
        return False
    
    print("\n✨ Reset completed successfully! ✨")
    print("\nYou can now start the application with 'python run.py'")
    if create_admin:
        print("Default admin credentials: username=admin, password=adminpassword")
    return True

if __name__ == "__main__":
    sys.exit(0 if main() else 1)