import os
import tempfile
import pytest
import numpy as np
import pandas as pd
from unittest.mock import Mock, patch, MagicMock

from vorpy.src.calculations.compare import compare_networks, make_interfaces
from vorpy.src.interface import Interface


class TestCompareNetworks:
    """Test cases for the compare_networks function."""
    
    def setup_method(self):
        """Set up test fixtures before each test method."""
        # Create a mock system object
        self.sys = Mock()
        self.sys.files = {'dir': '/test/dir'}
        self.sys.foam_data = None
        self.sys.start = 0.0
        
        # Create mock groups with proper structure
        self.group1 = Mock()
        self.group2 = Mock()
        
        # Add settings attribute to groups
        self.group1.settings = {'max_vert': 100}
        self.group2.settings = {'max_vert': 100}
        
        # Create mock network dataframes
        self.group1.net = Mock()
        self.group2.net = Mock()
        
        # Sample ball data
        self.ball_data = pd.DataFrame({
            'complete': [True, True, True],
            'vol': [1.0, 2.0, 3.0],
            'sa': [4.0, 5.0, 6.0],
            'rad': [0.5, 1.0, 1.5],
            'name': ['ball1', 'ball2', 'ball3'],
            'num': [0, 1, 2],
            'loc': [np.array([0, 0, 0]), np.array([1, 1, 1]), np.array([2, 2, 2])],
            'surfs': [[0], [1], [2]]
        })
        
        self.group1.net.balls = self.ball_data
        self.group2.net.balls = self.ball_data.copy()
        
        # Create mock surface data with proper indexing
        self.surf_data = pd.DataFrame({
            'balls': [[0, 1], [1, 2], [2, 0]]
        })
        self.group1.net.surfs = self.surf_data
        self.group2.net.surfs = self.surf_data.copy()
    
    def test_compare_networks_basic_functionality(self):
        pass
    
    def test_compare_networks_with_outliers(self):
        pass
    
    def test_compare_networks_incomplete_balls(self):
        """Test that incomplete balls are skipped."""
        incomplete_data = self.ball_data.copy()
        incomplete_data.loc[0, 'complete'] = False
        
        self.group1.net.balls = incomplete_data
        self.group2.net.balls = incomplete_data
        
        with patch('vorpy.src.calculations.compare.calc_dist', return_value=1.0):
            with patch('builtins.open', create=True):
                with patch('os.getcwd', return_value='/current'):
                    with patch('os.chdir'):
                        with patch('os.path.exists', return_value=True):
                            result = compare_networks(self.sys, self.group1, self.group2)
                            
                            # Should complete without error
                            assert result is None
    
    def test_compare_networks_file_operations(self):
        """Test file writing operations."""
        with patch('vorpy.src.calculations.compare.calc_dist', return_value=1.0):
            with patch('builtins.open', create=True) as mock_open:
                with patch('os.getcwd', return_value='/current'):
                    with patch('os.chdir'):
                        with patch('os.path.exists', return_value=True):
                            compare_networks(self.sys, self.group1, self.group2)
                            
                            # Should attempt to open files for writing
                            assert mock_open.call_count >= 1
    
    def test_compare_networks_data_structure(self):
        """Test that the function returns expected data structure."""
        with patch('vorpy.src.calculations.compare.calc_dist', return_value=1.0):
            with patch('builtins.open', create=True):
                with patch('os.getcwd', return_value='/current'):
                    with patch('os.chdir'):
                        with patch('os.path.exists', return_value=True):
                            result = compare_networks(self.sys, self.group1, self.group2)
                            
                            # Function should return None (modifies sys in place)
                            assert result is None


class TestMakeInterfaces:
    """Test cases for the make_interfaces function."""
    
    def setup_method(self):
        """Set up test fixtures before each test method."""
        # Create a mock system
        self.sys = Mock()
        self.sys.groups = []
        self.sys.ifaces = None
        
        # Create mock groups
        self.group1 = Mock()
        self.group1.ball_ndxs = [0, 1, 2]
        self.group1.net = Mock()
        
        self.group2 = Mock()
        self.group2.ball_ndxs = [3, 4, 5]
        self.group2.net = Mock()
        
        # Create mock surface data
        self.surf_data = pd.DataFrame({
            'balls': [[0, 3], [1, 4], [2, 5]]  # Overlapping surfaces
        })
        self.group1.net.surfs = self.surf_data
        self.group2.net.surfs = self.surf_data.copy()
    
    def test_make_interfaces_insufficient_groups(self):
        """Test behavior with less than 2 groups."""
        self.sys.groups = [self.group1]
        original_ifaces = self.sys.ifaces
        
        make_interfaces(self.sys)
        
        # Should not modify interfaces
        assert self.sys.ifaces is original_ifaces
    
    def test_make_interfaces_initializes_ifaces(self):
        """Test that interfaces list is initialized if None."""
        self.sys.groups = [self.group1, self.group2]
        self.sys.ifaces = None
        
        # Mock the Interface class to avoid complex initialization
        mock_interface_instance = Mock()
        with patch('vorpy.src.calculations.compare.Interface', return_value=mock_interface_instance) as mock_interface:
            make_interfaces(self.sys)
            
            # Should initialize interfaces list
            assert self.sys.ifaces is not None
            assert isinstance(self.sys.ifaces, list)
    
    def test_make_interfaces_skips_same_group(self):
        """Test that same group comparisons are skipped."""
        # Make group2 the same as group1
        self.group2.ball_ndxs = [0, 1, 2]  # Same as group1
        self.sys.groups = [self.group1, self.group2]
        self.sys.ifaces = []
        
        mock_interface_instance = Mock()
        with patch('vorpy.src.calculations.compare.Interface', return_value=mock_interface_instance) as mock_interface:
            make_interfaces(self.sys)
            
            # Should not create interface for same group
            assert mock_interface.call_count == 0
    
    def test_make_interfaces_skips_overlapping_ball_indices(self):
        """Test that groups with overlapping ball indices are handled correctly."""
        # Create groups with overlapping ball indices
        group3 = Mock()
        group3.ball_ndxs = [0, 1, 6]  # Overlaps with group1
        group3.net = Mock()
        group3.net.surfs = self.surf_data
        
        self.sys.groups = [self.group1, group3]
        self.sys.ifaces = []
        
        mock_interface_instance = Mock()
        with patch('vorpy.src.calculations.compare.Interface', return_value=mock_interface_instance) as mock_interface:
            make_interfaces(self.sys)
            
            # The function should create an interface even with overlapping ball indices
            # because it looks for overlapping surfaces, not ball indices
            assert mock_interface.call_count == 1
    
    def test_make_interfaces_skips_reverse_comparisons(self):
        """Test that reverse group comparisons are skipped."""
        self.sys.groups = [self.group1, self.group2]
        self.sys.ifaces = []
        
        mock_interface_instance = Mock()
        with patch('vorpy.src.calculations.compare.Interface', return_value=mock_interface_instance) as mock_interface:
            make_interfaces(self.sys)
            
            # Should only create one interface (not both directions)
            assert mock_interface.call_count <= 1
    
    def test_make_interfaces_no_overlapping_surfaces(self):
        """Test behavior when no overlapping surfaces exist."""
        # Create groups with no overlapping surfaces
        group3 = Mock()
        group3.ball_ndxs = [6, 7, 8]
        group3.net = Mock()
        group3.net.surfs = pd.DataFrame({'balls': [[6, 7], [7, 8]]})
        
        self.sys.groups = [self.group1, group3]
        self.sys.ifaces = []
        
        with patch('vorpy.src.interface.Interface') as mock_interface:
            make_interfaces(self.sys)
            
            # Should not create interface due to no overlapping surfaces
            assert mock_interface.call_count == 0
    
    def test_make_interfaces_creates_interface_with_overlapping_surfaces(self):
        """Test that interfaces are created when overlapping surfaces exist."""
        # Create group with overlapping surfaces
        group3 = Mock()
        group3.ball_ndxs = [3, 4, 5]
        group3.net = Mock()
        group3.net.surfs = pd.DataFrame({'balls': [[0, 3], [1, 4]]})  # Overlaps with group1
        
        self.sys.groups = [self.group1, group3]
        self.sys.ifaces = []
        
        mock_interface_instance = Mock()
        with patch('vorpy.src.calculations.compare.Interface', return_value=mock_interface_instance) as mock_interface:
            make_interfaces(self.sys)
            
            # Should create interface
            assert mock_interface.call_count == 1
            mock_interface.assert_called_once()
    
    def test_make_interfaces_handles_existing_interfaces(self):
        """Test behavior when interfaces list already exists."""
        self.sys.groups = [self.group1, self.group2]
        self.sys.ifaces = [Mock()]  # Pre-existing interface
        
        original_count = len(self.sys.ifaces)
        
        mock_interface_instance = Mock()
        with patch('vorpy.src.calculations.compare.Interface', return_value=mock_interface_instance) as mock_interface:
            make_interfaces(self.sys)
            
            # Should not modify existing interfaces list
            assert len(self.sys.ifaces) >= original_count
    
    def test_make_interfaces_interface_creation_parameters(self):
        """Test that Interface is created with correct parameters."""
        group3 = Mock()
        group3.ball_ndxs = [3, 4, 5]
        group3.net = Mock()
        group3.net.surfs = pd.DataFrame({'balls': [[0, 3], [1, 4]]})
        
        self.sys.groups = [self.group1, group3]
        self.sys.ifaces = []
        
        mock_interface_instance = Mock()
        with patch('vorpy.src.calculations.compare.Interface', return_value=mock_interface_instance) as mock_interface:
            make_interfaces(self.sys)
            
            # Check that Interface was called with correct parameters
            mock_interface.assert_called_once()
            call_args = mock_interface.call_args
            assert call_args[0][0] == self.group1  # First group
            assert call_args[0][1] == group3      # Second group
            assert 'surfs' in call_args[1]        # Should have surfs parameter


class TestCompareIntegration:
    """Integration tests for the compare module."""
    
    def test_compare_networks_with_real_data_structure(self):
        """Test compare_networks with more realistic data structures."""
        # Create more realistic mock data
        sys = Mock()
        sys.files = {'dir': '/test/dir'}
        sys.foam_data = []
        sys.start = 0.0
        
        # Create mock groups with realistic network structure
        group1 = Mock()
        group2 = Mock()
        
        # Add settings
        group1.settings = {'max_vert': 100}
        group2.settings = {'max_vert': 100}
        
        # Create realistic ball data
        ball_data = pd.DataFrame({
            'complete': [True, True, False, True],
            'vol': [1.0, 2.0, 3.0, 4.0],
            'sa': [2.0, 4.0, 6.0, 8.0],
            'rad': [0.5, 1.0, 1.5, 2.0],
            'name': ['A', 'B', 'C', 'D'],
            'num': [0, 1, 2, 3],
            'loc': [
                np.array([0, 0, 0]),
                np.array([1, 0, 0]),
                np.array([0, 1, 0]),
                np.array([0, 0, 1])
            ],
            'surfs': [[0], [1], [2], [0]]  # Fixed: use valid surface indices
        })
        
        group1.net = Mock()
        group1.net.balls = ball_data
        group1.net.surfs = pd.DataFrame({'balls': [[0, 1], [1, 2], [2, 3]]})
        
        group2.net = Mock()
        group2.net.balls = ball_data.copy()
        group2.net.surfs = pd.DataFrame({'balls': [[0, 1], [1, 2], [2, 3]]})
        
        with patch('vorpy.src.calculations.compare.calc_dist', return_value=1.0):
            with patch('builtins.open', create=True):
                with patch('os.getcwd', return_value='/current'):
                    with patch('os.chdir'):
                        with patch('os.path.exists', return_value=True):
                            result = compare_networks(sys, group1, group2)
                            
                            # Should complete successfully
                            assert result is None
    
    def test_make_interfaces_with_multiple_groups(self):
        """Test make_interfaces with multiple groups."""
        sys = Mock()
        sys.groups = []
        sys.ifaces = None
        
        # Create multiple mock groups
        groups = []
        for i in range(3):
            group = Mock()
            group.ball_ndxs = list(range(i*3, (i+1)*3))
            group.net = Mock()
            group.net.surfs = pd.DataFrame({'balls': [[i*3, i*3+1], [i*3+1, i*3+2]]})
            groups.append(group)
        
        sys.groups = groups
        
        mock_interface_instance = Mock()
        with patch('vorpy.src.calculations.compare.Interface', return_value=mock_interface_instance) as mock_interface:
            make_interfaces(sys)
            
            # Should initialize interfaces
            assert sys.ifaces is not None
            assert isinstance(sys.ifaces, list)