"""
Coverage tests for certificate.py - untested branches.
"""

import pytest

# ========================================================================
# Certificate serialization branches
# ========================================================================


def test_serialize_certificate_base():
    """Test serializing certificate base."""
    try:
        from bsv.wallet.serializer.certificate import serialize_certificate_base

        cert = {
            "type": b"type" + b"\x00" * 28,
            "serialNumber": b"serial" + b"\x00" * 26,
            "subject": b"subject" + b"\x00" * 26,
            "certifier": b"certifier" + b"\x00" * 24,
            "revocationOutpoint": {"txid": b"\x00" * 32, "index": 0},
            "fields": {"key1": "value1", "key2": "value2"},
        }

        result = serialize_certificate_base(cert)
        assert isinstance(result, bytes)
        assert len(result) > 0
    except ImportError:
        pytest.skip("certificate functions not available")


def test_serialize_certificate_with_signature():
    """Test serializing certificate with signature."""
    try:
        from bsv.wallet.serializer.certificate import serialize_certificate

        cert = {
            "type": b"type" + b"\x00" * 28,
            "serialNumber": b"serial" + b"\x00" * 26,
            "subject": b"subject" + b"\x00" * 26,
            "certifier": b"certifier" + b"\x00" * 24,
            "revocationOutpoint": {"txid": b"\x00" * 32, "index": 0},
            "fields": {},
            "signature": b"signature_data",
        }

        result = serialize_certificate(cert)
        assert isinstance(result, bytes)
        assert len(result) > 0
        # Should include signature
        assert b"signature_data" in result
    except ImportError:
        pytest.skip("certificate functions not available")


def test_serialize_certificate_without_signature():
    """Test serializing certificate without signature."""
    try:
        from bsv.wallet.serializer.certificate import serialize_certificate

        cert = {
            "type": b"type" + b"\x00" * 28,
            "serialNumber": b"serial" + b"\x00" * 26,
            "subject": b"subject" + b"\x00" * 26,
            "certifier": b"certifier" + b"\x00" * 24,
            "revocationOutpoint": {"txid": b"\x00" * 32, "index": 0},
            "fields": {},
            # No signature field
        }

        result = serialize_certificate(cert)
        assert isinstance(result, bytes)
        assert len(result) > 0
    except ImportError:
        pytest.skip("certificate functions not available")


# ========================================================================
# Certificate deserialization branches
# ========================================================================


def test_deserialize_certificate():
    """Test deserializing certificate."""
    try:
        from bsv.wallet.serializer.certificate import deserialize_certificate, serialize_certificate

        # Create a test certificate
        cert = {
            "type": b"type" + b"\x00" * 28,
            "serialNumber": b"serial" + b"\x00" * 26,
            "subject": b"subject" + b"\x00" * 26,
            "certifier": b"certifier" + b"\x00" * 24,
            "revocationOutpoint": {"txid": b"\x00" * 32, "index": 0},
            "fields": {"key1": "value1", "key2": "value2"},
            "signature": b"signature_data",
        }

        # Serialize it
        data = serialize_certificate(cert)

        # Deserialize it
        result = deserialize_certificate(data)

        # Verify the result
        assert isinstance(result, dict)
        assert result["type"] == cert["type"]
        assert result["serialNumber"] == cert["serialNumber"]
        assert result["subject"] == cert["subject"]
        assert result["certifier"] == cert["certifier"]
        assert result["signature"] == cert["signature"]
        assert result["fields"] == cert["fields"]
        assert result["revocationOutpoint"]["txid"] == cert["revocationOutpoint"]["txid"]
        assert result["revocationOutpoint"]["index"] == cert["revocationOutpoint"]["index"]
    except ImportError:
        pytest.skip("certificate functions not available")


def test_deserialize_certificate_no_signature():
    """Test deserializing certificate without signature."""
    try:
        from bsv.wallet.serializer.certificate import deserialize_certificate, serialize_certificate

        # Create a test certificate without signature
        cert = {
            "type": b"type" + b"\x00" * 28,
            "serialNumber": b"serial" + b"\x00" * 26,
            "subject": b"subject" + b"\x00" * 26,
            "certifier": b"certifier" + b"\x00" * 24,
            "revocationOutpoint": {"txid": b"\x00" * 32, "index": 0},
            "fields": {},
            # No signature
        }

        # Serialize it
        data = serialize_certificate(cert)

        # Deserialize it
        result = deserialize_certificate(data)

        # Verify the result - signature should be empty bytes
        assert isinstance(result, dict)
        assert result["signature"] == b""
    except ImportError:
        pytest.skip("certificate functions not available")


def test_deserialize_certificate_empty_fields():
    """Test deserializing certificate with empty fields."""
    try:
        from bsv.wallet.serializer.certificate import deserialize_certificate, serialize_certificate

        # Create a test certificate with empty fields
        cert = {
            "type": b"type" + b"\x00" * 28,
            "serialNumber": b"serial" + b"\x00" * 26,
            "subject": b"subject" + b"\x00" * 26,
            "certifier": b"certifier" + b"\x00" * 24,
            "revocationOutpoint": {"txid": b"\x00" * 32, "index": 0},
            "fields": {},  # Empty fields
            "signature": b"signature_data",
        }

        # Serialize it
        data = serialize_certificate(cert)

        # Deserialize it
        result = deserialize_certificate(data)

        # Verify the result
        assert isinstance(result, dict)
        assert result["fields"] == {}
    except ImportError:
        pytest.skip("certificate functions not available")


# ========================================================================
# Edge cases
# ========================================================================


def test_serialize_certificate_minimal():
    """Test serializing minimal certificate."""
    try:
        from bsv.wallet.serializer.certificate import serialize_certificate_base

        # Minimal certificate with defaults
        cert = {}

        result = serialize_certificate_base(cert)
        assert isinstance(result, bytes)
        # Should still produce some output with defaults
        assert len(result) > 0
    except ImportError:
        pytest.skip("certificate functions not available")


def test_deserialize_certificate_invalid_data():
    """Test deserializing invalid certificate data."""
    try:
        from bsv.wallet.serializer.certificate import deserialize_certificate

        # Try to deserialize invalid/truncated data
        invalid_data = b"too_short"

        # Should handle gracefully or raise appropriate exception
        try:
            result = deserialize_certificate(invalid_data)
            # If it doesn't raise, should return something
            assert result is not None
        except Exception:
            # Expected for invalid data
            pass
    except ImportError:
        pytest.skip("certificate functions not available")
