"""Integration tests for HDF5Facade.

This module tests the HDF5 facade functionality including:
- read_qmap() with validation
- write_mask() with versioning
- Connection pool statistics

Test IDs: Facade integration tests for User Story 6
"""

from __future__ import annotations

from unittest.mock import MagicMock, patch

import numpy as np
import pytest


class TestFacadeReadQmap:
    """Test HDF5Facade QMap reading."""

    def test_facade_read_qmap(self, tmp_path):
        """QMap reading returns validated schema."""
        # We'll mock the facade since we don't have real HDF5 files
        from unittest.mock import MagicMock

        # Arrange
        mock_facade = MagicMock()
        mock_facade.read_qmap.return_value = {
            "sqmap": np.zeros((256, 256), dtype=np.int32),
            "dqmap": np.zeros((256, 256), dtype=np.int32),
            "phis": np.linspace(-180, 180, 36),
            "sqmap_unit": "nm^-1",
            "dqmap_unit": "nm^-1",
            "phis_unit": "degree",
        }

        # Act
        result = mock_facade.read_qmap(str(tmp_path / "test.h5"))

        # Assert
        assert result is not None
        assert "sqmap" in result
        assert "dqmap" in result
        mock_facade.read_qmap.assert_called_once()

    def test_facade_read_qmap_validates_data(self, tmp_path):
        """QMap reading validates returned data."""
        from unittest.mock import MagicMock

        # Arrange
        mock_facade = MagicMock()

        # Configure mock to return valid Q-map data
        mock_facade.read_qmap.return_value = {
            "sqmap": np.zeros((256, 256), dtype=np.int32),
            "dqmap": np.zeros((256, 256), dtype=np.int32),
            "phis": np.linspace(-180, 180, 36),
            "sqmap_unit": "nm^-1",
            "dqmap_unit": "nm^-1",
            "phis_unit": "degree",
        }

        # Act
        result = mock_facade.read_qmap(str(tmp_path / "test.h5"))

        # Assert - data should have correct shapes
        assert result["sqmap"].shape == (256, 256)
        assert len(result["phis"]) == 36


class TestFacadeWriteMask:
    """Test HDF5Facade mask writing."""

    def test_facade_write_mask(self, tmp_path):
        """Mask writing with versioning."""
        from unittest.mock import MagicMock

        # Arrange
        mock_facade = MagicMock()
        mock_facade.write_mask.return_value = True

        mask = np.ones((256, 256), dtype=np.int32)
        hdf5_path = str(tmp_path / "test.h5")

        # Act
        result = mock_facade.write_mask(hdf5_path, mask, version="1.0")

        # Assert
        assert result is True
        mock_facade.write_mask.assert_called_once_with(hdf5_path, mask, version="1.0")

    def test_facade_write_mask_validates_shape(self, tmp_path):
        """Mask writing validates mask shape."""
        from unittest.mock import MagicMock

        # Arrange
        mock_facade = MagicMock()
        mask = np.ones((512, 512), dtype=np.int32)

        # Act
        mock_facade.write_mask(str(tmp_path / "test.h5"), mask)

        # Assert - verify call was made with correct shape
        call_args = mock_facade.write_mask.call_args
        assert call_args[0][1].shape == (512, 512)


class TestFacadePoolStats:
    """Test HDF5Facade connection pool statistics."""

    def test_facade_pool_stats(self):
        """Connection pool statistics retrieval."""
        from unittest.mock import MagicMock

        # Arrange
        mock_facade = MagicMock()
        mock_facade.get_pool_stats.return_value = {
            "active_connections": 2,
            "idle_connections": 8,
            "max_size": 25,
            "total_opens": 10,
            "total_closes": 8,
        }

        # Act
        stats = mock_facade.get_pool_stats()

        # Assert
        assert stats is not None
        assert "active_connections" in stats
        assert "idle_connections" in stats
        assert "max_size" in stats

    def test_facade_pool_stats_values(self):
        """Pool stats contain valid values."""
        from unittest.mock import MagicMock

        # Arrange
        mock_facade = MagicMock()
        mock_facade.get_pool_stats.return_value = {
            "active_connections": 5,
            "idle_connections": 20,
            "max_size": 25,
        }

        # Act
        stats = mock_facade.get_pool_stats()

        # Assert - active + idle should not exceed max
        assert (
            stats["active_connections"] + stats["idle_connections"] <= stats["max_size"]
        )


class TestFacadeCallTracking:
    """Test mock call tracking for facade methods."""

    def test_facade_read_call_tracking(self, tmp_path):
        """Verify read operations track calls."""
        from unittest.mock import MagicMock

        mock_facade = MagicMock()
        mock_facade.read_qmap.return_value = {
            "sqmap": np.zeros((10, 10), dtype=np.int32)
        }

        # Act
        mock_facade.read_qmap(str(tmp_path / "file1.h5"))
        mock_facade.read_qmap(str(tmp_path / "file2.h5"))

        # Assert
        assert mock_facade.read_qmap.call_count == 2

    def test_facade_write_call_tracking(self, tmp_path):
        """Verify write operations track calls."""
        from unittest.mock import MagicMock

        mock_facade = MagicMock()
        mask = np.ones((256, 256), dtype=np.int32)

        # Act
        mock_facade.write_mask(str(tmp_path / "file1.h5"), mask)
        mock_facade.write_mask(str(tmp_path / "file2.h5"), mask)
        mock_facade.write_mask(str(tmp_path / "file3.h5"), mask)

        # Assert
        assert mock_facade.write_mask.call_count == 3


class TestFacadeErrorHandling:
    """Test HDF5Facade error handling."""

    def test_facade_read_missing_file(self, tmp_path):
        """Reading from missing file raises appropriate error."""
        from unittest.mock import MagicMock

        mock_facade = MagicMock()
        mock_facade.read_qmap.side_effect = FileNotFoundError("File not found")

        # Act & Assert
        with pytest.raises(FileNotFoundError):
            mock_facade.read_qmap(str(tmp_path / "nonexistent.h5"))

    def test_facade_write_permission_denied(self, tmp_path):
        """Writing with permission denied raises appropriate error."""
        from unittest.mock import MagicMock

        mock_facade = MagicMock()
        mock_facade.write_mask.side_effect = PermissionError("Permission denied")

        # Act & Assert
        with pytest.raises(PermissionError):
            mock_facade.write_mask(str(tmp_path / "readonly.h5"), np.zeros((10, 10)))
