"""
Unit tests for EmergencyStopManager.
"""

import pytest
from unittest.mock import Mock, AsyncMock

from src.core.emergency_stop import EmergencyStopManager


class TestEmergencyStopManager:
    """Test cases for EmergencyStopManager."""
    
    def setup_method(self):
        """Set up test fixtures."""
        self.mock_db_client = Mock()
        self.mock_db_client.execute = Mock()
        self.emergency_stop_manager = EmergencyStopManager(self.mock_db_client)
    
    def test_emergency_stop_pump(self):
        """Test emergency stop for a specific pump."""
        # Act
        result = self.emergency_stop_manager.emergency_stop_pump(
            station_id='STATION_001',
            pump_id='PUMP_001',
            reason='Test emergency stop',
            user_id='test_user'
        )
        
        # Assert
        assert result is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_001', 'PUMP_001') is True
        assert self.mock_db_client.execute.called
    
    def test_emergency_stop_station(self):
        """Test emergency stop for all pumps in a station."""
        # Act
        result = self.emergency_stop_manager.emergency_stop_station(
            station_id='STATION_001',
            reason='Test station stop',
            user_id='test_user'
        )
        
        # Assert
        assert result is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_001', 'PUMP_001') is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_001', 'PUMP_002') is True
        assert self.mock_db_client.execute.called
    
    def test_emergency_stop_system(self):
        """Test system-wide emergency stop."""
        # Act
        result = self.emergency_stop_manager.emergency_stop_system(
            reason='Test system stop',
            user_id='test_user'
        )
        
        # Assert
        assert result is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_001', 'PUMP_001') is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_002', 'PUMP_001') is True
        assert self.mock_db_client.execute.called
    
    def test_clear_emergency_stop_pump(self):
        """Test clearing emergency stop for a specific pump."""
        # Arrange
        self.emergency_stop_manager.emergency_stop_pump('STATION_001', 'PUMP_001')
        
        # Act
        result = self.emergency_stop_manager.clear_emergency_stop_pump(
            station_id='STATION_001',
            pump_id='PUMP_001',
            reason='Test clearance',
            user_id='test_user'
        )
        
        # Assert
        assert result is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_001', 'PUMP_001') is False
        assert self.mock_db_client.execute.call_count == 2  # Stop + clearance
    
    def test_clear_emergency_stop_station(self):
        """Test clearing emergency stop for a station."""
        # Arrange
        self.emergency_stop_manager.emergency_stop_station('STATION_001')
        
        # Act
        result = self.emergency_stop_manager.clear_emergency_stop_station(
            station_id='STATION_001',
            reason='Test clearance',
            user_id='test_user'
        )
        
        # Assert
        assert result is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_001', 'PUMP_001') is False
        assert self.mock_db_client.execute.call_count == 2  # Stop + clearance
    
    def test_clear_emergency_stop_system(self):
        """Test clearing system-wide emergency stop."""
        # Arrange
        self.emergency_stop_manager.emergency_stop_system()
        
        # Act
        result = self.emergency_stop_manager.clear_emergency_stop_system(
            reason='Test clearance',
            user_id='test_user'
        )
        
        # Assert
        assert result is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_001', 'PUMP_001') is False
        assert self.mock_db_client.execute.call_count == 2  # Stop + clearance
    
    def test_clear_nonexistent_emergency_stop(self):
        """Test clearing emergency stop that doesn't exist."""
        # Act
        result = self.emergency_stop_manager.clear_emergency_stop_pump('STATION_001', 'PUMP_001')
        
        # Assert
        assert result is False
        assert self.mock_db_client.execute.call_count == 0
    
    def test_emergency_stop_priority(self):
        """Test that system stop overrides station and pump stops."""
        # Arrange
        self.emergency_stop_manager.emergency_stop_pump('STATION_001', 'PUMP_001')
        self.emergency_stop_manager.emergency_stop_station('STATION_002')
        
        # Act
        self.emergency_stop_manager.emergency_stop_system()
        
        # Assert
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_001', 'PUMP_001') is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_002', 'PUMP_001') is True
        assert self.emergency_stop_manager.is_emergency_stop_active('STATION_003', 'PUMP_001') is True
    
    def test_get_emergency_stop_status(self):
        """Test getting emergency stop status."""
        # Arrange
        self.emergency_stop_manager.emergency_stop_pump('STATION_001', 'PUMP_001')
        self.emergency_stop_manager.emergency_stop_station('STATION_002')
        self.emergency_stop_manager.emergency_stop_system()
        
        # Act
        status = self.emergency_stop_manager.get_emergency_stop_status()
        
        # Assert
        assert status['system_emergency_stop'] is True
        assert 'STATION_002' in status['emergency_stop_stations']
        assert {'station_id': 'STATION_001', 'pump_id': 'PUMP_001'} in status['emergency_stop_pumps']
        assert status['total_active_stops'] == 3  # system + station + pump