"""
Unit tests for extraction_edge_loop_analysis (TASK-044-4)

Tests the ExtractionHandler.edge_loop_analysis method which
analyzes edge loops for feature detection.
"""

import sys
from unittest.mock import MagicMock

import pytest
from blender_addon.application.handlers.extraction import ExtractionHandler


class TestEdgeLoopAnalysis:
    def setup_method(self):
        self.mock_bpy = sys.modules["bpy"]
        self.handler = ExtractionHandler()

        # Setup test mesh object
        self.cube = MagicMock()
        self.cube.name = "Cube"
        self.cube.type = "MESH"
        self.cube.data = MagicMock()

        def get_object(name):
            if name == "Cube":
                return self.cube
            return None

        self.mock_bpy.data.objects = MagicMock()
        self.mock_bpy.data.objects.__contains__ = lambda s, name: name == "Cube"
        self.mock_bpy.data.objects.__getitem__ = get_object

    def test_edge_loop_analysis_object_not_found(self):
        """Test error when object doesn't exist."""
        with pytest.raises(ValueError, match="not found"):
            self.handler.edge_loop_analysis("NonExistent")

    def test_edge_loop_analysis_not_mesh(self):
        """Test error when object is not a mesh."""
        camera = MagicMock()
        camera.name = "Camera"
        camera.type = "CAMERA"

        self.mock_bpy.data.objects.__contains__ = lambda s, name: name in ["Cube", "Camera"]
        self.mock_bpy.data.objects.__getitem__ = lambda s, name: camera if name == "Camera" else self.cube

        with pytest.raises(ValueError, match="not a mesh"):
            self.handler.edge_loop_analysis("Camera")


class TestEdgeLoopDetection:
    """Test edge loop detection heuristics."""

    def setup_method(self):
        self.handler = ExtractionHandler()

    def test_parallel_edge_detection(self):
        """Test detection of parallel edge groups."""
        # Parallel edges with same direction indicate edge loops
        assert True  # Placeholder - full test requires bmesh mocking

    def test_chamfer_detection(self):
        """Test detection of chamfered edges."""
        # Chamfered edges have small angles between faces
        assert True  # Placeholder - full test requires bmesh mocking
