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

import pytest

# Constants for skip messages
SKIP_HEADERS_CLIENT = "HeadersClient requires parameters"
SKIP_HEADERS_CLIENT_NOT_AVAILABLE = "HeadersClient not available"
SKIP_GULLIBLE_HEADERS_CLIENT = "GullibleHeadersClient not available"


# ========================================================================
# Headers client branches
# ========================================================================


def test_headers_client_init():
    """Test headers client initialization."""
    try:
        from bsv.headers_client import HeadersClient

        try:
            client = HeadersClient()
            assert hasattr(client, "get_header")
        except TypeError:
            # May require parameters
            pytest.skip(SKIP_HEADERS_CLIENT)
    except (ImportError, AttributeError):
        pytest.skip(SKIP_HEADERS_CLIENT_NOT_AVAILABLE)


def test_headers_client_get_header():
    """Test getting header."""
    try:
        from bsv.headers_client import HeadersClient

        try:
            client = HeadersClient()

            if hasattr(client, "get_header"):
                try:
                    header = client.get_header(0)
                    assert header is None or header
                except Exception:
                    pytest.skip("Requires valid configuration")
        except TypeError:
            pytest.skip(SKIP_HEADERS_CLIENT)
    except (ImportError, AttributeError):
        pytest.skip(SKIP_HEADERS_CLIENT_NOT_AVAILABLE)


def test_headers_client_get_tip():
    """Test getting chain tip."""
    try:
        from bsv.headers_client import HeadersClient

        try:
            client = HeadersClient()

            if hasattr(client, "get_tip"):
                try:
                    tip = client.get_tip()
                    assert tip is None or tip
                except Exception:
                    pytest.skip("Requires valid configuration")
        except TypeError:
            pytest.skip(SKIP_HEADERS_CLIENT)
    except (ImportError, AttributeError):
        pytest.skip(SKIP_HEADERS_CLIENT_NOT_AVAILABLE)


# ========================================================================
# Gullible headers client branches
# ========================================================================


def test_gullible_headers_client_init():
    """Test gullible headers client initialization."""
    try:
        from bsv.spv.gullible_headers_client import GullibleHeadersClient

        client = GullibleHeadersClient()
        assert hasattr(client, "current_height")
        assert hasattr(client, "is_valid_root_for_height")
    except (ImportError, AttributeError):
        pytest.skip(SKIP_GULLIBLE_HEADERS_CLIENT)


def test_gullible_headers_client_get_header():
    """Test getting header from gullible client."""
    try:
        from bsv.spv.gullible_headers_client import GullibleHeadersClient

        client = GullibleHeadersClient()

        if hasattr(client, "get_header"):
            header = client.get_header(0)
            assert header is None or header
    except (ImportError, AttributeError):
        pytest.skip(SKIP_GULLIBLE_HEADERS_CLIENT)


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


def test_headers_client_invalid_height():
    """Test getting header with invalid height."""
    try:
        from bsv.spv.gullible_headers_client import GullibleHeadersClient

        client = GullibleHeadersClient()

        if hasattr(client, "get_header"):
            try:
                client.get_header(-1)
                # Success case - acceptable
            except (ValueError, IndexError):
                # Expected exception - also acceptable
                pass
    except (ImportError, AttributeError):
        pytest.skip(SKIP_GULLIBLE_HEADERS_CLIENT)
