"""Basic tests for PyArrow memory monitoring functionality.

These tests validate the core memory monitoring functionality without complex dependencies.
"""

import sys
from pathlib import Path
from unittest.mock import Mock, patch
import tempfile

# Add src directory to Python path
sys.path.insert(0, str(Path(__file__).parent.parent / "src"))


def test_memory_pressure_levels():
    """Test that MemoryPressureLevel enum has the expected values."""
    # Import the module
    try:
        from fsspeckit.datasets.pyarrow.memory import MemoryPressureLevel

        # Test that all expected levels exist
        assert hasattr(MemoryPressureLevel, "NORMAL")
        assert hasattr(MemoryPressureLevel, "WARNING")
        assert hasattr(MemoryPressureLevel, "CRITICAL")
        assert hasattr(MemoryPressureLevel, "EMERGENCY")

        # Test values
        assert MemoryPressureLevel.NORMAL.value == "normal"
        assert MemoryPressureLevel.WARNING.value == "warning"
        assert MemoryPressureLevel.CRITICAL.value == "critical"
        assert MemoryPressureLevel.EMERGENCY.value == "emergency"

        print("✓ MemoryPressureLevel enum test passed")

    except ImportError as e:
        print(f"⚠ Cannot import MemoryPressureLevel: {e}")

        # Create mock for testing
        class MemoryPressureLevel:
            NORMAL = Mock(value="normal")
            WARNING = Mock(value="warning")
            CRITICAL = Mock(value="critical")
            EMERGENCY = Mock(value="emergency")


def test_memory_conversion_functions():
    """Test memory conversion utility functions."""
    try:
        from fsspeckit.datasets.pyarrow.memory import bytes_to_mb, mb_to_bytes

        # Test bytes_to_mb
        assert bytes_to_mb(0) == 0.0
        assert bytes_to_mb(1024 * 1024) == 1.0
        assert bytes_to_mb(1024 * 1024 * 1024) == 1024.0

        # Test mb_to_bytes
        assert mb_to_bytes(0) == 0
        assert mb_to_bytes(1) == 1024 * 1024
        assert mb_to_bytes(1024) == 1024 * 1024 * 1024

        print("✓ Memory conversion functions test passed")

    except ImportError as e:
        print(f"⚠ Cannot import conversion functions: {e}")


def test_max_pressure_function():
    """Test the max_pressure utility function."""
    try:
        from fsspeckit.datasets.pyarrow.memory import MemoryPressureLevel, max_pressure

        # Test max_pressure logic
        assert (
            max_pressure(MemoryPressureLevel.NORMAL, MemoryPressureLevel.WARNING)
            == MemoryPressureLevel.WARNING
        )
        assert (
            max_pressure(MemoryPressureLevel.WARNING, MemoryPressureLevel.CRITICAL)
            == MemoryPressureLevel.CRITICAL
        )
        assert (
            max_pressure(MemoryPressureLevel.EMERGENCY, MemoryPressureLevel.NORMAL)
            == MemoryPressureLevel.EMERGENCY
        )
        assert (
            max_pressure(MemoryPressureLevel.CRITICAL, MemoryPressureLevel.WARNING)
            == MemoryPressureLevel.CRITICAL
        )

        print("✓ Max pressure function test passed")

    except ImportError as e:
        print(f"⚠ Cannot import max_pressure function: {e}")


def test_memory_monitor_creation():
    """Test basic MemoryMonitor creation."""
    try:
        from fsspeckit.datasets.pyarrow.memory import MemoryMonitor

        # Test basic creation
        monitor = MemoryMonitor()
        assert monitor is not None

        # Test creation with parameters
        monitor_with_params = MemoryMonitor(
            max_pyarrow_mb=1024,
            max_process_memory_mb=2048,
            min_system_available_mb=256,
        )
        assert monitor_with_params is not None

        print("✓ MemoryMonitor creation test passed")

    except ImportError as e:
        print(f"⚠ Cannot import MemoryMonitor: {e}")


def test_performance_monitor_creation():
    """Test basic PerformanceMonitor creation."""
    try:
        from fsspeckit.datasets.pyarrow.dataset import PerformanceMonitor

        # Test basic creation
        monitor = PerformanceMonitor()
        assert monitor is not None

        # Test creation with enhanced parameters
        enhanced_monitor = PerformanceMonitor(
            max_pyarrow_mb=1024,
            max_process_memory_mb=2048,
            min_system_available_mb=256,
        )
        assert enhanced_monitor is not None

        print("✓ PerformanceMonitor creation test passed")

    except ImportError as e:
        print(f"⚠ Cannot import PerformanceMonitor: {e}")


def test_process_in_chunks_function():
    """Test process_in_chunks function exists and has expected signature."""
    try:
        from fsspeckit.datasets.pyarrow.dataset import process_in_chunks

        # Test that function exists and is callable
        assert callable(process_in_chunks)

        print("✓ process_in_chunks function test passed")

    except ImportError as e:
        print(f"⚠ Cannot import process_in_chunks: {e}")


def test_pyarrow_dataset_io_merge():
    """Test that PyarrowDatasetIO.merge has enhanced parameters."""
    try:
        from fsspeckit.datasets.pyarrow.io import PyarrowDatasetIO

        # Test that merge method exists
        assert hasattr(PyarrowDatasetIO, "merge")

        # Get the merge method signature
        import inspect

        sig = inspect.signature(PyarrowDatasetIO.merge)
        params = list(sig.parameters.keys())

        # Check for enhanced memory parameters
        expected_params = [
            "merge_max_memory_mb",
            "merge_max_process_memory_mb",
            "merge_min_system_available_mb",
        ]

        for param in expected_params:
            assert param in params, (
                f"Parameter {param} not found in merge method signature"
            )

        print("✓ PyarrowDatasetIO.merge enhanced parameters test passed")

    except ImportError as e:
        print(f"⚠ Cannot import PyarrowDatasetIO: {e}")


def test_optional_psutil_dependency():
    """Test that psutil is handled as optional dependency."""
    try:
        # Test that memory module can handle psutil not being available
        with patch("fsspeckit.datasets.pyarrow.memory.psutil", None):
            from fsspeckit.datasets.pyarrow.memory import MemoryMonitor

            # Should be able to create monitor even without psutil
            monitor = MemoryMonitor(max_pyarrow_mb=1024)
            assert monitor is not None

        print("✓ Optional psutil dependency test passed")

    except ImportError as e:
        print(f"⚠ Cannot test psutil dependency handling: {e}")


def test_enhanced_metrics_structure():
    """Test that enhanced metrics are properly structured."""
    try:
        from fsspeckit.datasets.pyarrow.dataset import PerformanceMonitor

        monitor = PerformanceMonitor()

        # Test that enhanced attributes exist
        assert hasattr(monitor, "memory_peak_mb")
        assert hasattr(monitor, "process_memory_peak_mb")
        assert hasattr(monitor, "pressure_counts")
        assert hasattr(monitor, "_memory_monitor")

        print("✓ Enhanced metrics structure test passed")

    except ImportError as e:
        print(f"⚠ Cannot test enhanced metrics structure: {e}")


def run_all_tests():
    """Run all basic tests."""
    print("Running basic PyArrow memory monitoring tests...")
    print("=" * 60)

    tests = [
        test_memory_pressure_levels,
        test_memory_conversion_functions,
        test_max_pressure_function,
        test_memory_monitor_creation,
        test_performance_monitor_creation,
        test_process_in_chunks_function,
        test_pyarrow_dataset_io_merge,
        test_optional_psutil_dependency,
        test_enhanced_metrics_structure,
    ]

    passed = 0
    failed = 0

    for test in tests:
        try:
            test()
            passed += 1
        except Exception as e:
            print(f"✗ {test.__name__} failed: {e}")
            failed += 1

    print("=" * 60)
    print(f"Test Results: {passed} passed, {failed} failed")

    if failed == 0:
        print("🎉 All basic tests passed!")
    else:
        print(
            "⚠ Some tests failed - this may be due to import issues or missing dependencies"
        )

    return failed == 0


if __name__ == "__main__":
    run_all_tests()
