"""
Coverage tests for totp/ modules - untested branches.
"""

import pytest

# Constants for skip messages
SKIP_TOTP = "generate_totp not available"


# ========================================================================
# TOTP generation branches
# ========================================================================


def test_totp_generate():
    """Test generating TOTP."""
    try:
        from bsv.totp import generate_totp

        secret = b"\x00" * 20

        try:
            totp = generate_totp(secret)
            assert isinstance(totp, str)
            assert len(totp) == 6  # Standard TOTP length
        except (NameError, AttributeError):
            pytest.skip(SKIP_TOTP)
    except ImportError:
        pytest.skip(SKIP_TOTP)


def test_totp_generate_with_timestamp():
    """Test generating TOTP with specific timestamp."""
    try:
        from bsv.totp import generate_totp

        secret = b"\x00" * 20
        timestamp = 1234567890

        try:
            totp = generate_totp(secret, timestamp=timestamp)
            assert isinstance(totp, str)
        except TypeError:
            # generate_totp may not accept timestamp parameter
            pytest.skip("generate_totp doesn't support timestamp")
        except (NameError, AttributeError):
            pytest.skip(SKIP_TOTP)
    except ImportError:
        pytest.skip(SKIP_TOTP)


# ========================================================================
# TOTP verification branches
# ========================================================================


def test_totp_verify_valid():
    """Test verifying valid TOTP."""
    try:
        from bsv.totp import generate_totp, verify_totp

        secret = b"\x01" * 20

        try:
            totp = generate_totp(secret)
            is_valid = verify_totp(totp, secret)
            assert is_valid
        except (NameError, AttributeError):
            pytest.skip("TOTP functions not available")
    except ImportError:
        pytest.skip(SKIP_TOTP)


def test_totp_verify_invalid():
    """Test verifying invalid TOTP."""
    try:
        from bsv.totp import verify_totp

        secret = b"\x00" * 20
        invalid_totp = "000000"

        try:
            is_valid = verify_totp(invalid_totp, secret)
            # Might be valid by chance, but usually not
            assert isinstance(is_valid, bool)
        except (NameError, AttributeError):
            pytest.skip("verify_totp not available")
    except ImportError:
        pytest.skip(SKIP_TOTP)


# ========================================================================
# TOTP configuration branches
# ========================================================================


def test_totp_with_custom_period():
    """Test TOTP with custom time period."""
    try:
        from bsv.totp import generate_totp

        secret = b"\x00" * 20

        try:
            totp = generate_totp(secret, period=60)
            assert isinstance(totp, str)
        except TypeError:
            # generate_totp may not accept period parameter
            pytest.skip("generate_totp doesn't support period")
        except (NameError, AttributeError):
            pytest.skip(SKIP_TOTP)
    except ImportError:
        pytest.skip(SKIP_TOTP)


def test_totp_with_custom_digits():
    """Test TOTP with custom digits."""
    try:
        from bsv.totp import generate_totp

        secret = b"\x00" * 20

        try:
            totp = generate_totp(secret, digits=8)
            assert len(totp) == 8
        except TypeError:
            # generate_totp may not accept digits parameter
            pytest.skip("generate_totp doesn't support digits")
        except (NameError, AttributeError):
            pytest.skip(SKIP_TOTP)
    except ImportError:
        pytest.skip(SKIP_TOTP)


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


def test_totp_deterministic():
    """Test TOTP is deterministic for same timestamp."""
    try:
        from bsv.totp import generate_totp

        secret = b"\x02" * 20
        timestamp = 1234567890

        try:
            totp1 = generate_totp(secret, timestamp=timestamp)
            totp2 = generate_totp(secret, timestamp=timestamp)
            assert totp1 == totp2
        except TypeError:
            pytest.skip("generate_totp doesn't support timestamp")
        except (NameError, AttributeError):
            pytest.skip(SKIP_TOTP)
    except ImportError:
        pytest.skip(SKIP_TOTP)
