import unittest
from unittest.mock import patch, MagicMock
import sys
import os

# 添加项目根目录到Python路径
sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))

from hardware.inverter import InverterController
from pymodbus.exceptions import ModbusException


class TestInverterController(unittest.TestCase):

    def setUp(self):
        """测试前的准备工作"""
        # 创建模拟的继电器控制器
        self.mock_relay = MagicMock()
        self.mock_relay.modbus_client = MagicMock()
        
        # 创建变频器控制器实例
        self.inverter = InverterController(relay_controller=self.mock_relay)

    def test_inverter_initialization(self):
        """测试变频器控制器初始化"""
        self.assertEqual(self.inverter.relay_controller, self.mock_relay)
        self.assertEqual(self.inverter.max_frequency, 400.0)
        
        # 检查配置
        self.assertIn('slave_id', self.inverter.config)
        self.assertIn('frequency_register', self.inverter.config)
        self.assertIn('start_register', self.inverter.config)
        self.assertIn('stop_register', self.inverter.config)
        self.assertIn('start_command', self.inverter.config)
        self.assertIn('stop_command', self.inverter.config)

    def test_set_frequency_success(self):
        """测试设置频率成功"""
        # 配置模拟对象
        self.mock_relay.modbus_client.connect.return_value = True
        mock_result = MagicMock()
        self.mock_relay.modbus_client.write_register.return_value = mock_result
        
        # 设置频率
        result = self.inverter.set_frequency(200.0)
        
        # 验证调用
        self.mock_relay.modbus_client.connect.assert_called_once()
        self.mock_relay.modbus_client.write_register.assert_called_once()
        self.assertTrue(result)

    def test_set_frequency_connection_failed(self):
        """测试设置频率时连接失败"""
        # 配置模拟对象
        self.mock_relay.modbus_client.connect.return_value = False
        
        # 设置频率
        result = self.inverter.set_frequency(200.0)
        
        # 验证结果
        self.assertFalse(result)
        self.mock_relay.modbus_client.connect.assert_called_once()
        self.mock_relay.modbus_client.write_register.assert_not_called()

    def test_set_frequency_modbus_exception(self):
        """测试设置频率时Modbus异常"""
        # 配置模拟对象
        self.mock_relay.modbus_client.connect.return_value = True
        self.mock_relay.modbus_client.write_register.side_effect = ModbusException("Modbus错误")
        
        # 设置频率
        result = self.inverter.set_frequency(200.0)
        
        # 验证结果
        self.assertFalse(result)

    def test_set_frequency_value_clamping(self):
        """测试频率值限制"""
        # 配置模拟对象
        self.mock_relay.modbus_client.connect.return_value = True
        mock_result = MagicMock()
        self.mock_relay.modbus_client.write_register.return_value = mock_result
        
        # 测试超过最大值的频率
        result = self.inverter.set_frequency(500.0)  # 超过400.0最大值
        
        # 验证调用
        self.assertTrue(result)
        self.mock_relay.modbus_client.write_register.assert_called_once()

    def test_control_start_success(self):
        """测试启动变频器成功"""
        # 配置模拟对象
        self.mock_relay.modbus_client.connect.return_value = True
        mock_result = MagicMock()
        self.mock_relay.modbus_client.write_register.return_value = mock_result
        
        # 启动变频器
        result = self.inverter.control('start')
        
        # 验证调用
        self.assertTrue(result)
        self.mock_relay.modbus_client.connect.assert_called_once()
        self.mock_relay.modbus_client.write_register.assert_called_once()

    def test_control_stop_success(self):
        """测试停止变频器成功"""
        # 配置模拟对象
        self.mock_relay.modbus_client.connect.return_value = True
        mock_result = MagicMock()
        self.mock_relay.modbus_client.write_register.return_value = mock_result
        
        # 停止变频器
        result = self.inverter.control('stop')
        
        # 验证调用
        self.assertTrue(result)
        self.mock_relay.modbus_client.connect.assert_called_once()
        self.mock_relay.modbus_client.write_register.assert_called_once()

    def test_control_invalid_action(self):
        """测试无效的控制动作"""
        # 配置模拟对象
        self.mock_relay.modbus_client.connect.return_value = True
        
        # 使用无效动作
        result = self.inverter.control('invalid_action')
        
        # 验证结果
        self.assertFalse(result)
        self.mock_relay.modbus_client.connect.assert_not_called()
        self.mock_relay.modbus_client.write_register.assert_not_called()

    def test_control_connection_failed(self):
        """测试控制时连接失败"""
        # 配置模拟对象
        self.mock_relay.modbus_client.connect.return_value = False
        
        # 启动变频器
        result = self.inverter.control('start')
        
        # 验证结果
        self.assertFalse(result)
        self.mock_relay.modbus_client.connect.assert_called_once()
        self.mock_relay.modbus_client.write_register.assert_not_called()

    def test_control_modbus_exception(self):
        """测试控制时Modbus异常"""
        # 配置模拟对象
        self.mock_relay.modbus_client.connect.return_value = True
        self.mock_relay.modbus_client.write_register.side_effect = ModbusException("Modbus错误")
        
        # 启动变频器
        result = self.inverter.control('start')
        
        # 验证结果
        self.assertFalse(result)


if __name__ == '__main__':
    unittest.main()