"""
Config command implementation.

This module implements the 'config' command for server authentication.
"""

import argparse
import getpass
import json
import sys

from ..config.manager import ConfigManager


def setup_config_parser(subparsers: argparse._SubParsersAction) -> None:
    """
    Set up the config command parser.

    Args:
        subparsers: Subparsers action from parent parser

    """
    parser = subparsers.add_parser(
        "config",
        help="Manage server authentication",
        description="Authenticate with keynet server and manage credentials",
        epilog="""
Examples:
    # Login to server (prompts for username/password)
    keynet-train config login --server-url https://api.example.com

    # Login with username specified
    keynet-train config login --server-url https://api.example.com --username myuser

    # Show current configuration
    keynet-train config show

    # Clear stored credentials
    keynet-train config clear

Notes:
    - Configuration is stored at ~/.config/keynet/config.json
    - File permissions are automatically set to 600 (owner only)
    - API key and Harbor credentials are stored in config file
        """,
    )

    subparsers_config = parser.add_subparsers(
        dest="config_command", help="Config subcommands"
    )

    # login subcommand
    login_parser = subparsers_config.add_parser("login", help="Login to keynet server")
    login_parser.add_argument(
        "--server-url",
        type=str,
        required=True,
        help="Server URL (e.g., https://api.example.com)",
    )
    login_parser.add_argument(
        "--username",
        type=str,
        help="Username (will prompt if not provided)",
    )

    # show subcommand
    subparsers_config.add_parser("show", help="Show current configuration")

    # clear subcommand
    subparsers_config.add_parser("clear", help="Clear stored credentials")

    parser.set_defaults(func=handle_config)


def handle_config(args: argparse.Namespace) -> int:
    """
    Handle config command execution.

    Args:
        args: Parsed command-line arguments

    Returns:
        Exit code (0 for success, 1 for error)

    """
    config_manager = ConfigManager()

    try:
        # Check which subcommand was used
        if not hasattr(args, "config_command") or not args.config_command:
            print("No subcommand specified. Use --help for usage information.")
            return 1

        # Handle 'login' subcommand
        if args.config_command == "login":
            return handle_login(args, config_manager)

        # Handle 'show' subcommand
        if args.config_command == "show":
            return handle_show(config_manager)

        # Handle 'clear' subcommand
        if args.config_command == "clear":
            return handle_clear(config_manager)

        print(f"Unknown subcommand: {args.config_command}")
        return 1

    except Exception as e:
        print(f"Error: {e}", file=sys.stderr)
        import traceback

        traceback.print_exc()
        return 1


def handle_login(args: argparse.Namespace, config_manager: ConfigManager) -> int:
    """
    Handle login subcommand.

    Args:
        args: Parsed arguments
        config_manager: ConfigManager instance

    Returns:
        Exit code (0 for success, 1 for error)

    """
    server_url = args.server_url

    # Get username
    username = args.username
    if not username:
        username = input("Username: ")

    # Get password (securely)
    password = getpass.getpass("Password: ")

    print()
    print(f"🔐 Logging in to {server_url}...")

    # TODO: Implement actual server API call
    # For now, this is a placeholder
    print("⚠️  NOT IMPLEMENTED: Server login API call")
    print()
    print("Expected workflow:")
    print(f"  1. POST {server_url}/api/login")
    print(f"     Body: {{username: '{username}', password: '***'}}")
    print("  2. Receive response:")
    print("     {")
    print('       "api_key": "...",')
    print('       "harbor": {')
    print('         "url": "harbor.example.com",')
    print('         "username": "...",')
    print('         "password": "..."')
    print("       }")
    print("     }")
    print("  3. Save credentials to ~/.config/keynet/config.json")
    print()

    # Placeholder: simulate successful login
    # In real implementation, use httpx to call server API
    # Example:
    # import httpx
    # response = httpx.post(
    #     f"{server_url}/api/login",
    #     json={"username": username, "password": password},
    # )
    # if response.status_code != 200:
    #     print(f"Login failed: {response.status_code}", file=sys.stderr)
    #     return 1
    # data = response.json()
    # config_manager.set_credentials(
    #     server_url=server_url,
    #     api_key=data["api_key"],
    #     harbor_url=data["harbor"]["url"],
    #     harbor_username=data["harbor"]["username"],
    #     harbor_password=data["harbor"]["password"],
    # )

    print("✓ Credentials would be stored at:", config_manager.config_path)
    print()
    print("To implement:")
    print("  - Add httpx dependency")
    print("  - Implement server API call")
    print("  - Handle authentication errors")

    return 0


def handle_show(config_manager: ConfigManager) -> int:
    """
    Handle show subcommand.

    Args:
        config_manager: ConfigManager instance

    Returns:
        Exit code (0 for success, 1 for error)

    """
    config = config_manager.show_config()
    print("Current configuration:")
    print(json.dumps(config, indent=2, ensure_ascii=False))
    print()
    print(f"Config location: {config_manager.config_path}")
    return 0


def handle_clear(config_manager: ConfigManager) -> int:
    """
    Handle clear subcommand.

    Args:
        config_manager: ConfigManager instance

    Returns:
        Exit code (0 for success, 1 for error)

    """
    if config_manager.config_path.exists():
        config_manager.config_path.unlink()
        print("✓ Configuration cleared")
        print(f"   Deleted: {config_manager.config_path}")
    else:
        print("No configuration file found")

    return 0
