"""
Convert PEM certificate to P7B (PKCS#7) format for Square webhooks
Square requires P7B format for webhook signature verification
"""

import subprocess
import sys
import os


def convert_pem_to_p7b(cert_file="cert.pem", output_file="cert.p7b"):
    """
    Convert PEM certificate to P7B (PKCS#7) format

    Args:
        cert_file: Input PEM certificate file
        output_file: Output P7B file
    """

    # Check if OpenSSL is available
    try:
        subprocess.run(["openssl", "version"], capture_output=True, check=True)
    except (subprocess.CalledProcessError, FileNotFoundError):
        print("ERROR: OpenSSL not found!")
        print("\nFor Windows, you can:")
        print(
            "1. Install OpenSSL from: https://slproweb.com/products/Win32OpenSSL.html"
        )
        print("2. Or use Git Bash which includes OpenSSL")
        print("3. Or use WSL (Windows Subsystem for Linux)")
        return False

    # Check if input file exists
    if not os.path.exists(cert_file):
        print(f"ERROR: Certificate file not found: {cert_file}")
        print(f"Current directory: {os.getcwd()}")
        print("\nMake sure you've generated the certificate first:")
        print("  python generate_cert.py")
        return False

    print(f"Converting {cert_file} to P7B format...")

    # Convert PEM to P7B (PKCS#7)
    # -certfile can include intermediate certificates if needed
    cmd = [
        "openssl",
        "crl2pkcs7",
        "-nocrl",
        "-certfile",
        cert_file,
        "-out",
        output_file,
    ]

    try:
        result = subprocess.run(cmd, check=True, capture_output=True, text=True)

        if os.path.exists(output_file):
            print(f"\n✓ P7B certificate created: {os.path.abspath(output_file)}")
            print(f"  File size: {os.path.getsize(output_file)} bytes")

            print("\n" + "=" * 60)
            print("Square Webhook Configuration:")
            print("=" * 60)
            print(f"1. Upload this file to Square Developer Dashboard:")
            print(f"   {os.path.abspath(output_file)}")
            print("\n2. In Square Dashboard:")
            print("   - Go to Webhooks settings")
            print("   - Click 'Manage Notification Settings'")
            print("   - Upload the P7B file for signature verification")
            print("\n3. Square will use this to verify webhook signatures")
            print("=" * 60)

            # Show file contents preview
            print("\nP7B file preview (first 500 chars):")
            with open(output_file, "r") as f:
                content = f.read(500)
                print(content)
                if len(content) == 500:
                    print("...")

            return True
        else:
            print("ERROR: Output file was not created")
            return False

    except subprocess.CalledProcessError as e:
        print(f"ERROR: Conversion failed: {e}")
        if e.stderr:
            print(f"OpenSSL error: {e.stderr}")
        return False


def convert_with_chain(cert_file="cert.pem", chain_file=None, output_file="cert.p7b"):
    """
    Convert PEM certificate with certificate chain to P7B format
    Use this if you have intermediate certificates

    Args:
        cert_file: Your certificate file
        chain_file: Intermediate/chain certificate file (optional)
        output_file: Output P7B file
    """

    if not chain_file:
        return convert_pem_to_p7b(cert_file, output_file)

    # Check files exist
    for f in [cert_file, chain_file]:
        if not os.path.exists(f):
            print(f"ERROR: File not found: {f}")
            return False

    print(f"Converting {cert_file} with chain {chain_file} to P7B format...")

    # Create combined cert file
    combined = "combined_cert.pem"
    with open(combined, "w") as out:
        with open(cert_file, "r") as f:
            out.write(f.read())
        with open(chain_file, "r") as f:
            out.write(f.read())

    result = convert_pem_to_p7b(combined, output_file)

    # Clean up combined file
    if os.path.exists(combined):
        os.remove(combined)

    return result


if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(
        description="Convert PEM certificate to P7B (PKCS#7) for Square webhooks"
    )
    parser.add_argument(
        "--cert",
        default="cert.pem",
        help="Input PEM certificate file (default: cert.pem)",
    )
    parser.add_argument(
        "--chain", default=None, help="Optional: Intermediate certificate chain file"
    )
    parser.add_argument(
        "--output", default="cert.p7b", help="Output P7B file (default: cert.p7b)"
    )

    args = parser.parse_args()

    print("=" * 60)
    print("PEM to P7B Certificate Converter for Square Webhooks")
    print("=" * 60)
    print()

    if args.chain:
        success = convert_with_chain(args.cert, args.chain, args.output)
    else:
        success = convert_pem_to_p7b(args.cert, args.output)

    if not success:
        sys.exit(1)

    print("\n✓ Conversion complete!")