import yaml
from pathlib import Path
from typing import List, Dict, Any
from models import (
    Customer, CustomerService, Location, Host, Service,
    ServiceType, HostType, VPNType
)


def get_config_dir() -> Path:
    """Get the VPNTray configuration directory path."""
    home = Path.home()
    config_dir = home / ".vpntray" / "customers"
    return config_dir


def ensure_config_dir() -> Path:
    """Ensure the configuration directory exists."""
    config_dir = get_config_dir()
    config_dir.mkdir(parents=True, exist_ok=True)
    return config_dir


def parse_service_type(service_type_str: str) -> ServiceType:
    """Convert a string to ServiceType enum, with fallback."""
    # Map common strings to enum values
    type_mapping = {
        "SSH": ServiceType.SSH,
        "Web GUI": ServiceType.WEB_GUI,
        "RDP": ServiceType.RDP,
        "VNC": ServiceType.VNC,
        "SMB": ServiceType.SMB,
        "Database": ServiceType.DATABASE,
        "FTP": ServiceType.FTP
    }
    return type_mapping.get(service_type_str, ServiceType.WEB_GUI)


def parse_host_type(host_type_str: str) -> HostType:
    """Convert a string to HostType enum, with fallback."""
    type_mapping = {
        "Linux": HostType.LINUX,
        "Windows": HostType.WINDOWS,
        "Windows Server": HostType.WINDOWS_SERVER,
        "Proxmox": HostType.PROXMOX,
        "ESXi": HostType.ESXI,
        "Router": HostType.ROUTER,
        "Switch": HostType.SWITCH,
    }
    return type_mapping.get(host_type_str, HostType.LINUX)


def parse_vpn_type(vpn_type_str: str) -> VPNType:
    """Convert a string to VPNType enum, with fallback."""
    type_mapping = {
        "OpenVPN": VPNType.OPENVPN,
        "WireGuard": VPNType.WIREGUARD,
        "IPSec": VPNType.IPSEC,
    }
    return type_mapping.get(vpn_type_str, VPNType.OPENVPN)


def parse_host(host_data: Dict[str, Any]) -> Host:
    """Parse a host from YAML data."""
    # Parse services
    services = []
    if 'services' in host_data:
        for service_data in host_data['services']:
            service = Service(
                name=service_data['name'],
                service_type=parse_service_type(service_data['service_type']),
                port=service_data['port']
            )
            services.append(service)

    # Create host
    host = Host(
        name=host_data['name'],
        ip_address=host_data['ip_address'],
        host_type=parse_host_type(host_data['host_type']),
        description=host_data.get('description', ''),
        services=services
    )

    # Parse sub-hosts (VMs) recursively
    if 'sub_hosts' in host_data:
        for subhost_data in host_data['sub_hosts']:
            subhost = parse_host(subhost_data)
            host.sub_hosts.append(subhost)

    return host


def parse_location(location_data: Dict[str, Any]) -> Location:
    """Parse a location from YAML data."""
    # Parse hosts
    hosts = []
    if 'hosts' in location_data:
        for host_data in location_data['hosts']:
            host = parse_host(host_data)
            hosts.append(host)

    # Create location
    location = Location(
        name=location_data['name'],
        vpn_type=parse_vpn_type(location_data['vpn_type']),
        connected=location_data.get('connected', False),
        active=location_data.get('active', False),
        vpn_config=location_data.get('vpn_config', ''),
        hosts=hosts
    )

    return location


def parse_customer(yaml_file: Path) -> Customer:
    """Parse a customer from a YAML file."""
    with open(yaml_file, 'r') as f:
        data = yaml.safe_load(f)

    # Parse customer services
    services = []
    if 'services' in data:
        for service_data in data['services']:
            service = CustomerService(
                name=service_data['name'],
                url=service_data['url'],
                service_type=service_data['service_type'],
                description=service_data.get('description', '')
            )
            services.append(service)

    # Parse locations
    locations = []
    if 'locations' in data:
        for location_data in data['locations']:
            location = parse_location(location_data)
            locations.append(location)

    # Create customer
    customer = Customer(
        name=data['name'],
        services=services,
        locations=locations
    )

    return customer


def load_customers() -> List[Customer]:
    """Load all customers from YAML files in the config directory."""
    config_dir = ensure_config_dir()
    customers = []

    # Get all YAML files in the directory
    yaml_files = list(config_dir.glob("*.yaml")) + \
        list(config_dir.glob("*.yml"))

    if not yaml_files:
        # No customer files found, initialize with examples
        print(f"No customer files found in {config_dir}")
        print("Run 'python data_loader.py --init' to create example customer files")
        return get_demo_customers()

    # Load each customer file
    for yaml_file in yaml_files:
        try:
            customer = parse_customer(yaml_file)
            customers.append(customer)
            print(f"Loaded customer: {customer.name} from {yaml_file.name}")
        except Exception as e:
            print(f"Error loading {yaml_file}: {e}")

    return customers


def save_customer(customer: Customer, filename: str = None) -> None:
    """Save a customer to a YAML file."""
    config_dir = ensure_config_dir()

    if filename is None:
        # Generate filename from customer name
        filename = customer.name.lower().replace(' ', '_') + '.yaml'

    filepath = config_dir / filename

    # Convert customer to dictionary
    data = {
        'name': customer.name,
        'services': [
            {
                'name': service.name,
                'url': service.url,
                'service_type': service.service_type,
                'description': service.description
            }
            for service in customer.services
        ],
        'locations': []
    }

    # Convert locations
    for location in customer.locations:
        location_data = {
            'name': location.name,
            'vpn_type': location.vpn_type.value,
            'vpn_config': location.vpn_config,
            'active': location.active,
            'connected': location.connected,
            'hosts': []
        }

        # Convert hosts
        def convert_host(host):
            host_data = {
                'name': host.name,
                'ip_address': host.ip_address,
                'host_type': host.host_type.value,
                'description': host.description,
                'services': [
                    {
                        'name': service.name,
                        'service_type': service.service_type.value,
                        'port': service.port
                    }
                    for service in host.services
                ]
            }

            if host.sub_hosts:
                host_data['sub_hosts'] = [convert_host(
                    subhost) for subhost in host.sub_hosts]

            return host_data

        for host in location.hosts:
            location_data['hosts'].append(convert_host(host))

        data['locations'].append(location_data)

    # Write to file
    with open(filepath, 'w') as f:
        yaml.dump(data, f, default_flow_style=False, sort_keys=False)

    print(f"Saved customer to {filepath}")


def get_demo_customers() -> List[Customer]:
    """Return demo customers for when no config files exist."""
    # Return a minimal demo customer
    demo_customer = Customer(name="Demo Customer")

    demo_customer.services = [
        CustomerService(
            name="Demo Portal",
            url="https://demo.example.com",
            service_type="Web Portal",
            description="Demo web portal"
        )
    ]

    demo_location = Location(
        name="Demo Location",
        vpn_type=VPNType.OPENVPN,
        connected=False,
        active=True,
        vpn_config="/etc/openvpn/demo.ovpn"
    )

    demo_host = Host(
        name="DEMO-01",
        ip_address="10.0.0.1",
        host_type=HostType.LINUX,
        description="Demo server",
        services=[
            Service("SSH", ServiceType.SSH, 22),
            Service("Web", ServiceType.WEB_GUI, 80)
        ]
    )

    demo_location.hosts = [demo_host]
    demo_customer.locations = [demo_location]

    return [demo_customer]


def initialize_example_customers():
    """Create example customer YAML files in the config directory."""
    config_dir = ensure_config_dir()

    # Create TechCorp example
    techcorp_file = config_dir / "techcorp_solutions.yaml"
    if not techcorp_file.exists():
        # Read from our example file
        example_file = Path(__file__).parent / "example_customer.yaml"
        if example_file.exists():
            with open(example_file, 'r') as f:
                content = f.read()
            with open(techcorp_file, 'w') as f:
                f.write(content)
            print(f"Created example: {techcorp_file}")

    # Create a simpler example
    simple_file = config_dir / "simple_customer.yaml"
    if not simple_file.exists():
        simple_yaml = """name: Simple Customer

services:
  - name: Company Website
    url: https://simple.example.com
    service_type: Web Portal
    description: Main company website

locations:
  - name: Main Office
    vpn_type: WireGuard
    vpn_config: /etc/wireguard/simple.conf
    active: false
    connected: false
    
    hosts:
      - name: SERVER-01
        ip_address: 192.168.1.10
        host_type: Linux
        description: Main server
        services:
          - name: SSH
            service_type: SSH
            port: 22
          - name: Web Interface
            service_type: Web GUI
            port: 443
"""
        with open(simple_file, 'w') as f:
            f.write(simple_yaml)
        print(f"Created example: {simple_file}")

    print(f"\nExample customer files created in: {config_dir}")
    print("You can now edit these files or create new ones following the same format.")


# Allow running this file directly to initialize examples
if __name__ == "__main__":
    import sys
    if len(sys.argv) > 1 and sys.argv[1] == "--init":
        initialize_example_customers()
    else:
        # Test loading
        customers = load_customers()
        for customer in customers:
            print(f"\nLoaded: {customer.name}")
            print(f"  Services: {len(customer.services)}")
            print(f"  Locations: {len(customer.locations)}")
            for location in customer.locations:
                print(f"    - {location.name}: {len(location.hosts)} hosts")