#include "gtest/gtest.h"
#include "alert_manager.hpp"
#include <vector>
#include <string>

// Mock the global functions to avoid side effects
namespace {
    std::string g_output_buffer;
    void mock_cout(const std::string& msg) {
        g_output_buffer += msg + "\n";
    }
    void mock_cerr(const std::string& msg) {
        g_output_buffer += msg + "\n";
    }
}

// Replace std::cout and std::cerr with mocks
#define cout g_output_buffer
#define cerr g_output_buffer

// Mock time function for deterministic testing
static uint32_t mock_time = 1000;
uint32_t get_mock_time() { return mock_time; }

// Override std::time to use mock_time
extern "C" {
    time_t time(time_t* tloc) {
        if (tloc) *tloc = mock_time;
        return mock_time;
    }
}

// Test fixture for AlertManager
class AlertManagerTest : public ::testing::Test {
protected:
    AlertManager alert_manager;

    void SetUp() override {
        g_output_buffer.clear();
        mock_time = 1000;
    }

    void TearDown() override {
        // Reset state
        alert_manager.resetAllAlerts();
    }
};

// Test case: AlertManager constructor
TEST_F(AlertManagerTest, testAlertManagerConstructorNormalInput) {
    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().first, 100.0f);
    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().second, -50.0f);
    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
    EXPECT_TRUE(alert_manager.getAlertHistory(10).empty());
}

// Test case: AlertManager destructor
TEST_F(AlertManagerTest, testAlertManagerDestructorNormalInput) {
    // No specific behavior expected, just ensure no crash
    // Destructor is tested implicitly by scope
    EXPECT_NO_FATAL_FAILURE({});
}

// Test case: initialize
TEST_F(AlertManagerTest, testInitializeNormalInput) {
    alert_manager.initialize();
    EXPECT_NE(g_output_buffer.find("预警管理器初始化完成"), std::string::npos);
    EXPECT_NE(g_output_buffer.find("默认预警阈值：上限=100米，下限=-50米"), std::string::npos);
}

// Test case: checkAltitudeAlert - normal altitude
TEST_F(AlertManagerTest, testCheckAltitudeAlertNormalInput) {
    alert_manager.checkAltitudeAlert(50.0f, 1000);
    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
    EXPECT_FALSE(g_output_buffer.find("高度超过上限阈值") != std::string::npos);
    EXPECT_FALSE(g_output_buffer.find("高度低于下限阈值") != std::string::npos);
}

// Test case: checkAltitudeAlert - upper threshold exceeded
TEST_F(AlertManagerTest, testCheckAltitudeAlertUpperThresholdExceeded) {
    alert_manager.checkAltitudeAlert(101.0f, 1000);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_UPPER);
    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
    EXPECT_NE(g_output_buffer.find("高度超过上限阈值"), std::string::npos);
}

// Test case: checkAltitudeAlert - lower threshold exceeded
TEST_F(AlertManagerTest, testCheckAltitudeAlertLowerThresholdExceeded) {
    alert_manager.checkAltitudeAlert(-51.0f, 1000);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_LOWER);
    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
    EXPECT_NE(g_output_buffer.find("高度低于下限阈值"), std::string::npos);
}

// Test case: checkAltitudeAlert - recovery from upper threshold
TEST_F(AlertManagerTest, testCheckAltitudeAlertRecoveryFromUpperThreshold) {
    alert_manager.checkAltitudeAlert(101.0f, 1000);
    alert_manager.checkAltitudeAlert(99.0f, 1001);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_TRUE(active_alerts.empty());
    EXPECT_NE(g_output_buffer.find("预警已解决: 高度上限预警"), std::string::npos);
}

// Test case: checkAltitudeAlert - recovery from lower threshold
TEST_F(AlertManagerTest, testCheckAltitudeAlertRecoveryFromLowerThreshold) {
    alert_manager.checkAltitudeAlert(-51.0f, 1000);
    alert_manager.checkAltitudeAlert(-49.0f, 1001);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_TRUE(active_alerts.empty());
    EXPECT_NE(g_output_buffer.find("预警已解决: 高度下限预警"), std::string::npos);
}

// Test case: setAltitudeThresholds - valid thresholds
TEST_F(AlertManagerTest, testSetAltitudeThresholdsValidInput) {
    alert_manager.setAltitudeThresholds(200.0f, -100.0f);
    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().first, 200.0f);
    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().second, -100.0f);
    EXPECT_NE(g_output_buffer.find("预警阈值已更新"), std::string::npos);
    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
}

// Test case: setAltitudeThresholds - invalid thresholds
TEST_F(AlertManagerTest, testSetAltitudeThresholdsInvalidInput) {
    alert_manager.setAltitudeThresholds(50.0f, 100.0f);
    EXPECT_NE(g_output_buffer.find("错误：上限阈值必须大于下限阈值。"), std::string::npos);
    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().first, 100.0f);
    EXPECT_FLOAT_EQ(alert_manager.getAltitudeThresholds().second, -50.0f);
}

// Test case: triggerSensorFailure
TEST_F(AlertManagerTest, testTriggerSensorFailureNormalInput) {
    alert_manager.triggerSensorFailure(1000);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::SENSOR_FAILURE);
    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
    EXPECT_NE(g_output_buffer.find("传感器故障"), std::string::npos);
}

// Test case: triggerLowBattery
TEST_F(AlertManagerTest, testTriggerLowBatteryNormalInput) {
    alert_manager.triggerLowBattery(1000, 15.5f);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::LOW_BATTERY);
    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
    EXPECT_NE(g_output_buffer.find("低电量警告：当前电量15.5%"), std::string::npos);
}

// Test case: triggerCommunicationError
TEST_F(AlertManagerTest, testTriggerCommunicationErrorNormalInput) {
    alert_manager.triggerCommunicationError(1000);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::COMMUNICATION_ERROR);
    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
    EXPECT_NE(g_output_buffer.find("通信错误"), std::string::npos);
}

// Test case: acknowledgeAllAlerts
TEST_F(AlertManagerTest, testAcknowledgeAllAlertsNormalInput) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.triggerLowBattery(1001, 10.0f);
    alert_manager.acknowledgeAllAlerts(1002);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_TRUE(active_alerts.empty());
    EXPECT_NE(g_output_buffer.find("预警已确认: 传感器故障"), std::string::npos);
    EXPECT_NE(g_output_buffer.find("预警已确认: 低电量预警"), std::string::npos);
}

// Test case: acknowledgeAlert - valid type
TEST_F(AlertManagerTest, testAcknowledgeAlertValidType) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.acknowledgeAlert(AlertType::SENSOR_FAILURE, 1001);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_TRUE(active_alerts.empty());
    EXPECT_NE(g_output_buffer.find("预警已确认: 传感器故障"), std::string::npos);
}

// Test case: acknowledgeAlert - invalid type
TEST_F(AlertManagerTest, testAcknowledgeAlertInvalidType) {
    alert_manager.acknowledgeAlert(AlertType::NONE, 1000);
    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
    EXPECT_TRUE(g_output_buffer.empty());
}

// Test case: resetAlert - active alert
TEST_F(AlertManagerTest, testResetAlertActiveAlert) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.resetAlert(AlertType::SENSOR_FAILURE);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_TRUE(active_alerts.empty());
    EXPECT_NE(g_output_buffer.find("预警已解决: 传感器故障"), std::string::npos);
}

// Test case: resetAlert - inactive alert
TEST_F(AlertManagerTest, testResetAlertInactiveAlert) {
    alert_manager.resetAlert(AlertType::SENSOR_FAILURE);
    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
    EXPECT_TRUE(g_output_buffer.empty());
}

// Test case: resetAllAlerts
TEST_F(AlertManagerTest, testResetAllAlertsNormalInput) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.triggerLowBattery(1001, 10.0f);
    alert_manager.resetAllAlerts();
    EXPECT_TRUE(alert_manager.getActiveAlerts().empty());
    EXPECT_NE(g_output_buffer.find("所有预警已重置。"), std::string::npos);
}

// Test case: hasActiveAlerts - no alerts
TEST_F(AlertManagerTest, testHasActiveAlertsNoAlerts) {
    EXPECT_FALSE(alert_manager.hasActiveAlerts());
}

// Test case: hasActiveAlerts - with active alerts
TEST_F(AlertManagerTest, testHasActiveAlertsWithActiveAlerts) {
    alert_manager.triggerSensorFailure(1000);
    EXPECT_TRUE(alert_manager.hasActiveAlerts());
}

// Test case: hasUnacknowledgedAlerts - no unacknowledged alerts
TEST_F(AlertManagerTest, testHasUnacknowledgedAlertsNoUnacknowledgedAlerts) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.acknowledgeAllAlerts(1001);
    EXPECT_FALSE(alert_manager.hasUnacknowledgedAlerts());
}

// Test case: hasUnacknowledgedAlerts - with unacknowledged alerts
TEST_F(AlertManagerTest, testHasUnacknowledgedAlertsWithUnacknowledgedAlerts) {
    alert_manager.triggerSensorFailure(1000);
    EXPECT_TRUE(alert_manager.hasUnacknowledgedAlerts());
}

// Test case: getActiveAlerts - empty
TEST_F(AlertManagerTest, testGetActiveAlertsEmpty) {
    auto alerts = alert_manager.getActiveAlerts();
    EXPECT_TRUE(alerts.empty());
}

// Test case: getActiveAlerts - non-empty
TEST_F(AlertManagerTest, testGetActiveAlertsNonEmpty) {
    alert_manager.triggerSensorFailure(1000);
    auto alerts = alert_manager.getActiveAlerts();
    EXPECT_EQ(alerts.size(), 1);
    EXPECT_EQ(alerts[0].type, AlertType::SENSOR_FAILURE);
}

// Test case: getAlertHistory - max_count larger than history size
TEST_F(AlertManagerTest, testGetAlertHistoryMaxCountLargerThanHistorySize) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.triggerLowBattery(1001, 10.0f);
    auto history = alert_manager.getAlertHistory(10);
    EXPECT_EQ(history.size(), 2);
}

// Test case: getAlertHistory - max_count smaller than history size
TEST_F(AlertManagerTest, testGetAlertHistoryMaxCountSmallerThanHistorySize) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.triggerLowBattery(1001, 10.0f);
    alert_manager.triggerCommunicationError(1002);
    auto history = alert_manager.getAlertHistory(2);
    EXPECT_EQ(history.size(), 2);
    EXPECT_EQ(history[0].type, AlertType::COMMUNICATION_ERROR);
    EXPECT_EQ(history[1].type, AlertType::LOW_BATTERY);
}

// Test case: getStatusDescription - no active alerts
TEST_F(AlertManagerTest, testGetStatusDescriptionNoActiveAlerts) {
    std::string desc = alert_manager.getStatusDescription();
    EXPECT_EQ(desc, "系统状态：正常");
}

// Test case: getStatusDescription - with active alerts
TEST_F(AlertManagerTest, testGetStatusDescriptionWithActiveAlerts) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.triggerLowBattery(1001, 10.0f);
    std::string desc = alert_manager.getStatusDescription();
    EXPECT_NE(desc.find("系统状态：有2个活动预警"), std::string::npos);
    EXPECT_NE(desc.find("传感器故障") != std::string::npos);
    EXPECT_NE(desc.find("低电量预警") != std::string::npos);
}

// Test case: clearHistory
TEST_F(AlertManagerTest, testClearHistoryNormalInput) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.clearHistory();
    EXPECT_TRUE(alert_manager.getAlertHistory(10).empty());
    EXPECT_NE(g_output_buffer.find("预警历史记录已清空。"), std::string::npos);
}

// Test case: addToHistory - within limit
TEST_F(AlertManagerTest, testAddToHistoryWithinLimit) {
    AlertInfo alert;
    alert.type = AlertType::SENSOR_FAILURE;
    alert.status = AlertStatus::ACTIVE;
    alert.trigger_time = 1000;
    alert.description = "Test alert";
    alert_manager.addToHistory(alert);
    auto history = alert_manager.getAlertHistory(10);
    EXPECT_EQ(history.size(), 1);
    EXPECT_EQ(history[0].type, AlertType::SENSOR_FAILURE);
}

// Test case: addToHistory - exceeding limit
TEST_F(AlertManagerTest, testAddToHistoryExceedingLimit) {
    const int MAX_HISTORY = 5;
    for (int i = 0; i < MAX_HISTORY + 1; ++i) {
        AlertInfo alert;
        alert.type = AlertType::SENSOR_FAILURE;
        alert.status = AlertStatus::ACTIVE;
        alert.trigger_time = 1000 + i;
        alert.description = "Test alert";
        alert_manager.addToHistory(alert);
    }
    auto history = alert_manager.getAlertHistory(10);
    EXPECT_EQ(history.size(), MAX_HISTORY);
    EXPECT_EQ(history[0].trigger_time, 1001);
}

// Test case: triggerAlert - basic functionality
TEST_F(AlertManagerTest, testTriggerAlertBasicFunctionality) {
    alert_manager.triggerAlert(AlertType::SENSOR_FAILURE, 1000, "Test alert");
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].description, "Test alert");
    EXPECT_NE(g_output_buffer.find("[预警] 传感器故障: Test alert"), std::string::npos);
}

// Test case: updateAlertStatus - acknowledged
TEST_F(AlertManagerTest, testUpdateAlertStatusAcknowledged) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.updateAlertStatus(AlertType::SENSOR_FAILURE, AlertStatus::ACKNOWLEDGED, 1001);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_TRUE(active_alerts.empty());
    EXPECT_NE(g_output_buffer.find("预警已确认: 传感器故障"), std::string::npos);
}

// Test case: updateAlertStatus - resolved
TEST_F(AlertManagerTest, testUpdateAlertStatusResolved) {
    alert_manager.triggerSensorFailure(1000);
    alert_manager.updateAlertStatus(AlertType::SENSOR_FAILURE, AlertStatus::RESOLVED, 1001);
    auto active_alerts = alert_manager.getActiveAlerts();
    EXPECT_TRUE(active_alerts.empty());
    EXPECT_NE(g_output_buffer.find("预警已解决: 传感器故障"), std::string::npos);
}

// Test case: getAlertTypeName - known types
TEST_F(AlertManagerTest, testGetAlertTypeNameKnownTypes) {
    EXPECT_EQ(alert_manager.getAlertTypeName(AlertType::ALTITUDE_UPPER), "高度上限预警");
    EXPECT_EQ(alert_manager.getAlertTypeName(AlertType::SENSOR_FAILURE), "传感器故障");
    EXPECT_EQ(alert_manager.getAlertTypeName(AlertType::NONE), "无");
}

// Test case: getAlertStatusName - known statuses
TEST_F(AlertManagerTest, testGetAlertStatusNameKnownStatuses) {
    EXPECT_EQ(alert_manager.getAlertStatusName(AlertStatus::ACTIVE), "预警中");
    EXPECT_EQ(alert_manager.getAlertStatusName(AlertStatus::ACKNOWLEDGED), "已确认");
    EXPECT_EQ(alert_manager.getAlertStatusName(AlertStatus::RESOLVED), "已解决");
}

// Test case: getAltitudeThresholds - getter method
TEST_F(AlertManagerTest, testGetAltitudeThresholdsGetterMethod) {
    auto thresholds = alert_manager.getAltitudeThresholds();
    EXPECT_FLOAT_EQ(thresholds.first, 100.0f);
    EXPECT_FLOAT_EQ(thresholds.second, -50.0f);
}