#!/usr/bin/env python3
"""
Virtual ISP Stack with OpenVPN Integration
HuggingFace Spaces Entry Point

This application provides a complete Virtual ISP stack with OpenVPN server integration,
allowing users to manage VPN connections, generate client configurations, and monitor
network traffic through a RESTful API.
"""

import os
import sys
import logging

# Add current directory to Python path
sys.path.insert(0, os.path.dirname(__file__))

from flask import Flask, send_from_directory, jsonify
from flask_cors import CORS
from models.user import db
from routes.user import user_bp
from routes.isp_api import init_engines, isp_api

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

# Create Flask application
app = Flask(__name__, static_folder=os.path.join(os.path.dirname(__file__), 'static'))

# Enable CORS for all routes
CORS(app, origins="*")

# Configuration
app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY', 'vpn-isp-stack-secret-key-change-in-production')

# Database configuration
database_path = os.path.join(os.path.dirname(__file__), 'database', 'app.db')
app.config['SQLALCHEMY_DATABASE_URI'] = f"sqlite:///{database_path}"
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

# Initialize database
db.init_app(app)

# Register blueprints
app.register_blueprint(user_bp, url_prefix='/api')
app.register_blueprint(isp_api, url_prefix='/api')

# Engine configuration
app.config.update({
    "dhcp": {
        "network": "10.0.0.0/24",
        "range_start": "10.0.0.10",
        "range_end": "10.0.0.100",
        "lease_time": 3600,
        "gateway": "10.0.0.1",
        "dns_servers": ["8.8.8.8", "8.8.4.4"]
    },
    "nat": {
        "port_range_start": 10000,
        "port_range_end": 65535,
        "session_timeout": 300
    },
    "firewall": {
        "default_policy": "ACCEPT",
        "log_blocked": True
    },
    "tcp": {
        "initial_window": 65535,
        "max_retries": 3,
        "timeout": 30
    },
    "openvpn": {
        "server_ip": "10.8.0.1",
        "server_port": 1194,
        "network": "10.8.0.0/24"
    },
    "logger": {
        "log_level": "INFO",
        "log_file": "/tmp/virtual_isp.log"
    }
})

# Initialize database tables
with app.app_context():
    try:
        db.create_all()
        logger.info("Database tables created successfully")
    except Exception as e:
        logger.error(f"Error creating database tables: {e}")

# Initialize engines
try:
    init_engines(app.config)
    logger.info("All engines initialized successfully")
except Exception as e:
    logger.error(f"Error initializing engines: {e}")

@app.route('/')
def index():
    """Main index page"""
    return serve_static('')

@app.route('/health')
def health_check():
    """Health check endpoint for monitoring"""
    return jsonify({
        'status': 'healthy',
        'service': 'Virtual ISP Stack with OpenVPN',
        'version': '1.0.0'
    })

@app.route('/api')
def api_info():
    """API information endpoint"""
    return jsonify({
        'service': 'Virtual ISP Stack API',
        'version': '1.0.0',
        'endpoints': {
            'openvpn': {
                'status': '/api/openvpn/status',
                'start': '/api/openvpn/start',
                'stop': '/api/openvpn/stop',
                'clients': '/api/openvpn/clients',
                'config': '/api/openvpn/config/<client_name>',
                'stats': '/api/openvpn/stats',
                'configs': '/api/openvpn/configs'
            },
            'dhcp': {
                'leases': '/api/dhcp/leases'
            },
            'nat': {
                'sessions': '/api/nat/sessions',
                'stats': '/api/nat/stats'
            },
            'firewall': {
                'rules': '/api/firewall/rules',
                'logs': '/api/firewall/logs',
                'stats': '/api/firewall/stats'
            }
        }
    })

@app.route('/<path:path>')
def serve_static(path):
    """Serve static files"""
    static_folder_path = app.static_folder
    if static_folder_path is None:
        return jsonify({'error': 'Static folder not configured'}), 404

    if path != "" and os.path.exists(os.path.join(static_folder_path, path)):
        return send_from_directory(static_folder_path, path)
    else:
        index_path = os.path.join(static_folder_path, 'index.html')
        if os.path.exists(index_path):
            return send_from_directory(static_folder_path, 'index.html')
        else:
            return jsonify({
                'message': 'Virtual ISP Stack with OpenVPN Integration',
                'status': 'running',
                'api_docs': '/api'
            })

@app.errorhandler(404)
def not_found(error):
    """Handle 404 errors"""
    return jsonify({'error': 'Endpoint not found', 'api_docs': '/api'}), 404

@app.errorhandler(500)
def internal_error(error):
    """Handle 500 errors"""
    return jsonify({'error': 'Internal server error'}), 500

if __name__ == '__main__':
    # Get port from environment variable (HuggingFace Spaces uses PORT)
    port = int(os.environ.get('PORT', 7860))
    
    logger.info(f"Starting Virtual ISP Stack with OpenVPN on port {port}")
    
    # Run the application
    app.run(
        host='0.0.0.0',
        port=port,
        debug=False,
        threaded=True
    )