#include <gtest/gtest.h>
#include <gmock/gmock.h>
#include "alert_manager.hpp"
#include <sstream>
#include <iostream>

// 辅助类：用于捕获标准输出和标准错误输出
class StreamCapture {
public:
    StreamCapture() {
        old_cout_buf_ = std::cout.rdbuf(cout_buffer_.rdbuf());
        old_cerr_buf_ = std::cerr.rdbuf(cerr_buffer_.rdbuf());
    }

    ~StreamCapture() {
        std::cout.rdbuf(old_cout_buf_);
        std::cerr.rdbuf(old_cerr_buf_);
    }

    std::string getCout() const { return cout_buffer_.str(); }
    std::string getCerr() const { return cerr_buffer_.str(); }

private:
    std::stringstream cout_buffer_;
    std::stringstream cerr_buffer_;
    std::streambuf* old_cout_buf_;
    std::streambuf* old_cerr_buf_;
};

// 测试夹具类
class AlertManagerTest : public ::testing::Test {
protected:
    void SetUp() override {
        manager.initialize();
    }

    void TearDown() override {
        manager.resetAllAlerts();
    }

    AlertManager manager;
};

// ==================== checkAltitudeAlert 测试 ====================

// 正常输入测试：高度在阈值范围内，不应触发任何预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertNormalRange) {
    StreamCapture capture;
    
    // 默认阈值：上限100.0，下限-50.0
    manager.checkAltitudeAlert(50.0f, 1000);
    
    EXPECT_FALSE(manager.hasActiveAlerts());
    EXPECT_FALSE(manager.hasUnacknowledgedAlerts());
    
    // 验证没有预警相关的输出
    std::string cout_output = capture.getCout();
    EXPECT_EQ(cout_output.find("[预警]"), std::string::npos);
}

// 正常输入测试：高度超过上限，应触发上限预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertUpperThresholdExceeded) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(150.0f, 2000);
    
    EXPECT_TRUE(manager.hasActiveAlerts());
    EXPECT_TRUE(manager.hasUnacknowledgedAlerts());
    
    auto active_alerts = manager.getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_UPPER);
    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
    EXPECT_EQ(active_alerts[0].trigger_time, 2000);
    
    // 验证输出包含预警信息
    std::string cout_output = capture.getCout();
    EXPECT_NE(cout_output.find("高度上限预警"), std::string::npos);
    EXPECT_NE(cout_output.find("150"), std::string::npos);
}

// 正常输入测试：高度低于下限，应触发下限预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertLowerThresholdExceeded) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(-100.0f, 3000);
    
    EXPECT_TRUE(manager.hasActiveAlerts());
    EXPECT_TRUE(manager.hasUnacknowledgedAlerts());
    
    auto active_alerts = manager.getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_LOWER);
    EXPECT_EQ(active_alerts[0].status, AlertStatus::ACTIVE);
    EXPECT_EQ(active_alerts[0].trigger_time, 3000);
    
    // 验证输出包含预警信息
    std::string cout_output = capture.getCout();
    EXPECT_NE(cout_output.find("高度下限预警"), std::string::npos);
    EXPECT_NE(cout_output.find("-100"), std::string::npos);
}

// 边界值测试：高度恰好等于上限阈值，不应触发预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertAtUpperBoundary) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(100.0f, 4000);
    
    EXPECT_FALSE(manager.hasActiveAlerts());
    EXPECT_FALSE(manager.hasUnacknowledgedAlerts());
    
    std::string cout_output = capture.getCout();
    EXPECT_EQ(cout_output.find("[预警]"), std::string::npos);
}

// 边界值测试：高度恰好等于下限阈值，不应触发预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertAtLowerBoundary) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(-50.0f, 5000);
    
    EXPECT_FALSE(manager.hasActiveAlerts());
    EXPECT_FALSE(manager.hasUnacknowledgedAlerts());
    
    std::string cout_output = capture.getCout();
    EXPECT_EQ(cout_output.find("[预警]"), std::string::npos);
}

// 边界值测试：高度略高于上限阈值（浮点数精度边界）
TEST_F(AlertManagerTest, testCheckAltitudeAlertJustAboveUpperBoundary) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(100.0001f, 6000);
    
    EXPECT_TRUE(manager.hasActiveAlerts());
    
    auto active_alerts = manager.getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_UPPER);
}

// 边界值测试：高度略低于下限阈值（浮点数精度边界）
TEST_F(AlertManagerTest, testCheckAltitudeAlertJustBelowLowerBoundary) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(-50.0001f, 7000);
    
    EXPECT_TRUE(manager.hasActiveAlerts());
    
    auto active_alerts = manager.getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_LOWER);
}

// 特殊场景测试：高度从超出上限恢复到正常范围，应解除预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertRecoverFromUpperAlert) {
    StreamCapture capture;
    
    // 先触发上限预警
    manager.checkAltitudeAlert(150.0f, 8000);
    EXPECT_TRUE(manager.hasActiveAlerts());
    
    // 高度恢复正常
    manager.checkAltitudeAlert(50.0f, 9000);
    
    EXPECT_FALSE(manager.hasActiveAlerts());
    EXPECT_FALSE(manager.hasUnacknowledgedAlerts());
    
    // 验证预警已解决
    auto history = manager.getAlertHistory(10);
    bool found_resolved = false;
    for (const auto& alert : history) {
        if (alert.type == AlertType::ALTITUDE_UPPER && 
            alert.status == AlertStatus::RESOLVED) {
            found_resolved = true;
            break;
        }
    }
    EXPECT_TRUE(found_resolved);
}

// 特殊场景测试：高度从低于下限恢复到正常范围，应解除预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertRecoverFromLowerAlert) {
    StreamCapture capture;
    
    // 先触发下限预警
    manager.checkAltitudeAlert(-100.0f, 10000);
    EXPECT_TRUE(manager.hasActiveAlerts());
    
    // 高度恢复正常
    manager.checkAltitudeAlert(0.0f, 11000);
    
    EXPECT_FALSE(manager.hasActiveAlerts());
    EXPECT_FALSE(manager.hasUnacknowledgedAlerts());
    
    // 验证预警已解决
    auto history = manager.getAlertHistory(10);
    bool found_resolved = false;
    for (const auto& alert : history) {
        if (alert.type == AlertType::ALTITUDE_LOWER && 
            alert.status == AlertStatus::RESOLVED) {
            found_resolved = true;
            break;
        }
    }
    EXPECT_TRUE(found_resolved);
}

// 特殊场景测试：同时触发上限和下限预警（理论上不可能，但测试边界情况）
TEST_F(AlertManagerTest, testCheckAltitudeAlertBothThresholdsExceeded) {
    StreamCapture capture;
    
    // 修改阈值为较小范围，使高度同时超出上下限（不可能，但测试代码健壮性）
    manager.setAltitudeThresholds(10.0f, 20.0f);
    
    // 高度30同时超出上下限（下限20，上限10），实际只应触发上限预警
    manager.checkAltitudeAlert(30.0f, 12000);
    
    auto active_alerts = manager.getActiveAlerts();
    EXPECT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_UPPER);
}

// 异常输入测试：高度为极大值
TEST_F(AlertManagerTest, testCheckAltitudeAlertExtremeHighValue) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(1e10f, 13000);
    
    EXPECT_TRUE(manager.hasActiveAlerts());
    auto active_alerts = manager.getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_UPPER);
}

// 异常输入测试：高度为极小值
TEST_F(AlertManagerTest, testCheckAltitudeAlertExtremeLowValue) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(-1e10f, 14000);
    
    EXPECT_TRUE(manager.hasActiveAlerts());
    auto active_alerts = manager.getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_LOWER);
}

// 异常输入测试：时间戳为0
TEST_F(AlertManagerTest, testCheckAltitudeAlertZeroTimestamp) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(150.0f, 0);
    
    EXPECT_TRUE(manager.hasActiveAlerts());
    auto active_alerts = manager.getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].trigger_time, 0);
}

// 异常输入测试：时间戳为最大值
TEST_F(AlertManagerTest, testCheckAltitudeAlertMaxTimestamp) {
    StreamCapture capture;
    
    manager.checkAltitudeAlert(150.0f, UINT32_MAX);
    
    EXPECT_TRUE(manager.hasActiveAlerts());
    auto active_alerts = manager.getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].trigger_time, UINT32_MAX);
}

// ==================== setAltitudeThresholds 测试 ====================

// 正常输入测试：设置有效的上下限阈值
TEST_F(AlertManagerTest, testSetAltitudeThresholdsValidValues) {
    StreamCapture capture;
    
    manager.setAltitudeThresholds(200.0f, 0.0f);
    
    // 验证新阈值生效
    manager.checkAltitudeAlert(150.0f, 15000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    manager.checkAltitudeAlert(250.0f, 16000);
    EXPECT_TRUE(manager.hasActiveAlerts());
    
    // 验证输出信息
    std::string cout_output = capture.getCout();
    EXPECT_NE(cout_output.find("预警阈值已更新"), std::string::npos);
    EXPECT_NE(cout_output.find("200"), std::string::npos);
    EXPECT_NE(cout_output.find("0"), std::string::npos);
}

// 正常输入测试：设置阈值后，之前的预警应被重置
TEST_F(AlertManagerTest, testSetAltitudeThresholdsResetsAlerts) {
    StreamCapture capture;
    
    // 先触发预警
    manager.checkAltitudeAlert(150.0f, 17000);
    EXPECT_TRUE(manager.hasActiveAlerts());
    
    // 修改阈值
    manager.setAltitudeThresholds(200.0f, 0.0f);
    
    // 预警应被重置
    EXPECT_FALSE(manager.hasActiveAlerts());
}

// 异常输入测试：上限小于下限，应输出错误信息且不修改阈值
TEST_F(AlertManagerTest, testSetAltitudeThresholdsUpperLessThanLower) {
    StreamCapture capture;
    
    float original_upper = 100.0f;
    float original_lower = -50.0f;
    
    manager.setAltitudeThresholds(10.0f, 20.0f);
    
    // 验证阈值未改变
    manager.checkAltitudeAlert(50.0f, 18000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    // 验证错误输出
    std::string cerr_output = capture.getCerr();
    EXPECT_NE(cerr_output.find("上限阈值必须大于下限阈值"), std::string::npos);
}

// 边界值测试：上限等于下限，应视为非法输入
TEST_F(AlertManagerTest, testSetAltitudeThresholdsUpperEqualToLower) {
    StreamCapture capture;
    
    manager.setAltitudeThresholds(50.0f, 50.0f);
    
    // 验证阈值未改变
    manager.checkAltitudeAlert(50.0f, 19000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    // 验证错误输出
    std::string cerr_output = capture.getCerr();
    EXPECT_NE(cerr_output.find("上限阈值必须大于下限阈值"), std::string::npos);
}

// 边界值测试：设置非常大的阈值范围
TEST_F(AlertManagerTest, testSetAltitudeThresholdsLargeRange) {
    StreamCapture capture;
    
    manager.setAltitudeThresholds(10000.0f, -10000.0f);
    
    // 验证新阈值生效
    manager.checkAltitudeAlert(5000.0f, 20000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    manager.checkAltitudeAlert(15000.0f, 21000);
    EXPECT_TRUE(manager.hasActiveAlerts());
}

// 边界值测试：设置非常小的阈值范围
TEST_F(AlertManagerTest, testSetAltitudeThresholdsSmallRange) {
    StreamCapture capture;
    
    manager.setAltitudeThresholds(1.0f, 0.0f);
    
    // 验证新阈值生效
    manager.checkAltitudeAlert(0.5f, 22000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    manager.checkAltitudeAlert(1.5f, 23000);
    EXPECT_TRUE(manager.hasActiveAlerts());
    
    manager.checkAltitudeAlert(-0.5f, 24000);
    EXPECT_TRUE(manager.hasActiveAlerts());
}

// 异常输入测试：设置负数的上限和下限
TEST_F(AlertManagerTest, testSetAltitudeThresholdsNegativeValues) {
    StreamCapture capture;
    
    manager.setAltitudeThresholds(-10.0f, -100.0f);
    
    // 验证新阈值生效
    manager.checkAltitudeAlert(-50.0f, 25000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    manager.checkAltitudeAlert(-5.0f, 26000);
    EXPECT_TRUE(manager.hasActiveAlerts());
}

// 异常输入测试：设置浮点数精度极限值
TEST_F(AlertManagerTest, testSetAltitudeThresholdsFloatPrecision) {
    StreamCapture capture;
    
    manager.setAltitudeThresholds(100.000001f, 0.000001f);
    
    // 验证新阈值生效
    manager.checkAltitudeAlert(50.0f, 27000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    manager.checkAltitudeAlert(100.00001f, 28000);
    EXPECT_TRUE(manager.hasActiveAlerts());
}

// 特殊场景测试：多次设置阈值，验证最后一次生效
TEST_F(AlertManagerTest, testSetAltitudeThresholdsMultipleCalls) {
    StreamCapture capture;
    
    manager.setAltitudeThresholds(200.0f, 100.0f);
    manager.setAltitudeThresholds(300.0f, 200.0f);
    manager.setAltitudeThresholds(400.0f, 300.0f);
    
    // 验证最后一次设置生效
    manager.checkAltitudeAlert(350.0f, 29000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    manager.checkAltitudeAlert(450.0f, 30000);
    EXPECT_TRUE(manager.hasActiveAlerts());
}

// 特殊场景测试：设置阈值后立即检查高度，验证阈值更新及时
TEST_F(AlertManagerTest, testSetAltitudeThresholdsImmediateEffect) {
    StreamCapture capture;
    
    // 当前高度50，默认阈值下正常
    manager.checkAltitudeAlert(50.0f, 31000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    // 修改阈值为[30, 60]
    manager.setAltitudeThresholds(60.0f, 30.0f);
    
    // 高度50仍在范围内
    manager.checkAltitudeAlert(50.0f, 32000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    // 修改阈值为[40, 45]
    manager.setAltitudeThresholds(45.0f, 40.0f);
    
    // 高度50超出上限
    manager.checkAltitudeAlert(50.0f, 33000);
    EXPECT_TRUE(manager.hasActiveAlerts());
}

// 特殊场景测试：设置阈值后，之前已解决的预警不应再次触发
TEST_F(AlertManagerTest, testSetAltitudeThresholdsDoesNotReTriggerResolvedAlerts) {
    StreamCapture capture;
    
    // 触发并解决预警
    manager.checkAltitudeAlert(150.0f, 34000);
    manager.checkAltitudeAlert(50.0f, 35000);
    EXPECT_FALSE(manager.hasActiveAlerts());
    
    // 修改阈值
    manager.setAltitudeThresholds(200.0f, 0.0f);
    
    // 不应有活动预警
    EXPECT_FALSE(manager.hasActiveAlerts());
}

int main(int argc, char **argv) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}