"""
API Key Generation Script.

Generates secure API keys for VoiceAuth API authentication.
"""

import argparse
import secrets
import sys
from pathlib import Path


def generate_api_key(prefix: str = "sk_", length: int = 48) -> str:
    """
    Generate a secure API key.

    Args:
        prefix: Prefix for the API key (default: "sk_")
        length: Length of the random portion in characters (default: 48)

    Returns:
        Generated API key string
    """
    # Generate random hex bytes (length/2 bytes = length hex chars)
    random_part = secrets.token_hex(length // 2)
    return f"{prefix}{random_part}"


def main() -> None:
    """Main entry point for API key generation."""
    parser = argparse.ArgumentParser(
        description="Generate secure API keys for VoiceAuth API",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  python generate_api_key.py
  python generate_api_key.py --prefix sk_live_
  python generate_api_key.py --count 5
  python generate_api_key.py --save
        """,
    )

    parser.add_argument(
        "--prefix",
        type=str,
        default="sk_",
        help="Prefix for the API key (default: sk_)",
    )
    parser.add_argument(
        "--length",
        type=int,
        default=48,
        help="Length of random portion (default: 48)",
    )
    parser.add_argument(
        "--count",
        type=int,
        default=1,
        help="Number of keys to generate (default: 1)",
    )
    parser.add_argument(
        "--save",
        action="store_true",
        help="Save to .env file (appends if exists)",
    )

    args = parser.parse_args()

    # Generate keys
    keys = [generate_api_key(args.prefix, args.length) for _ in range(args.count)]

    # Display keys
    print("\n" + "=" * 60)
    print("VoiceAuth API - Generated API Keys")
    print("=" * 60 + "\n")

    for i, key in enumerate(keys, 1):
        if args.count > 1:
            print(f"Key {i}: {key}")
        else:
            print(f"API Key: {key}")

    print("\n" + "-" * 60)
    print("Usage Instructions:")
    print("-" * 60)
    print("\n1. Add to your .env file:")
    print(f"   API_KEYS={','.join(keys)}")
    print("\n2. Use in requests:")
    print(f'   curl -H "x-api-key: {keys[0]}" ...')
    print("\n" + "=" * 60 + "\n")

    # Save to .env if requested
    if args.save:
        env_path = Path(__file__).parent.parent / ".env"

        # Check if .env exists
        if env_path.exists():
            # Read existing content
            with open(env_path, "r") as f:
                content = f.read()

            # Check if API_KEYS already exists
            if "API_KEYS=" in content:
                print(f"[WARNING] API_KEYS already exists in {env_path}")
                print("   Please update it manually or remove the existing entry.")
                sys.exit(1)

            # Append new keys
            with open(env_path, "a") as f:
                f.write(f"\nAPI_KEYS={','.join(keys)}\n")

            print(f"[OK] API keys appended to {env_path}")
        else:
            # Create new .env from template
            template_path = Path(__file__).parent.parent / ".env.example"

            if template_path.exists():
                with open(template_path, "r") as f:
                    content = f.read()

                # Replace placeholder
                content = content.replace(
                    "API_KEYS=sk_test_your_api_key_here",
                    f"API_KEYS={','.join(keys)}",
                )

                with open(env_path, "w") as f:
                    f.write(content)

                print(f"[OK] Created {env_path} with generated API keys")
            else:
                # Just create minimal .env
                with open(env_path, "w") as f:
                    f.write(f"API_KEYS={','.join(keys)}\n")

                print(f"[OK] Created {env_path} with API keys")


if __name__ == "__main__":
    main()