#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 getCoutOutput() const { return cout_buffer_.str(); }
    std::string getCerrOutput() 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
class AlertManagerTest : public ::testing::Test {
protected:
    void SetUp() override {
        // 每个测试用例前重置 AlertManager
        manager_ = std::make_unique<AlertManager>();
    }
    
    void TearDown() override {
        manager_.reset();
    }
    
    std::unique_ptr<AlertManager> manager_;
};

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

// 正常输入测试：高度在阈值范围内，不触发预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertNormalRange) {
    StreamCapture capture;
    
    // 默认阈值：上限100.0，下限-50.0
    // 测试高度在正常范围内
    manager_->checkAltitudeAlert(50.0f, 1000);
    
    // 验证没有预警被触发
    EXPECT_FALSE(manager_->hasActiveAlerts());
    EXPECT_FALSE(manager_->hasUnacknowledgedAlerts());
    
    // 验证输出不包含预警信息
    std::string output = capture.getCoutOutput();
    EXPECT_EQ(output.find("[预警]"), std::string::npos);
}

// 正常输入测试：高度超过上限，触发上限预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertUpperThreshold) {
    StreamCapture capture;
    
    // 测试高度超过上限
    manager_->checkAltitudeAlert(150.0f, 2000);
    
    // 验证有活动预警
    EXPECT_TRUE(manager_->hasActiveAlerts());
    EXPECT_TRUE(manager_->hasUnacknowledgedAlerts());
    
    // 验证预警类型为上限预警
    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 output = capture.getCoutOutput();
    EXPECT_NE(output.find("高度上限预警"), std::string::npos);
    EXPECT_NE(output.find("150"), std::string::npos);
}

// 正常输入测试：高度低于下限，触发下限预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertLowerThreshold) {
    StreamCapture capture;
    
    // 测试高度低于下限
    manager_->checkAltitudeAlert(-100.0f, 3000);
    
    // 验证有活动预警
    EXPECT_TRUE(manager_->hasActiveAlerts());
    EXPECT_TRUE(manager_->hasUnacknowledgedAlerts());
    
    // 验证预警类型为下限预警
    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 output = capture.getCoutOutput();
    EXPECT_NE(output.find("高度下限预警"), std::string::npos);
    EXPECT_NE(output.find("-100"), std::string::npos);
}

// 边界值测试：高度等于上限阈值，不触发预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertEqualToUpper) {
    StreamCapture capture;
    
    // 高度等于上限阈值，不应触发预警
    manager_->checkAltitudeAlert(100.0f, 4000);
    
    EXPECT_FALSE(manager_->hasActiveAlerts());
    EXPECT_FALSE(manager_->hasUnacknowledgedAlerts());
    
    std::string output = capture.getCoutOutput();
    EXPECT_EQ(output.find("[预警]"), std::string::npos);
}

// 边界值测试：高度等于下限阈值，不触发预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertEqualToLower) {
    StreamCapture capture;
    
    // 高度等于下限阈值，不应触发预警
    manager_->checkAltitudeAlert(-50.0f, 5000);
    
    EXPECT_FALSE(manager_->hasActiveAlerts());
    EXPECT_FALSE(manager_->hasUnacknowledgedAlerts());
    
    std::string output = capture.getCoutOutput();
    EXPECT_EQ(output.find("[预警]"), std::string::npos);
}

// 边界值测试：高度略高于上限，触发预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertJustAboveUpper) {
    StreamCapture capture;
    
    // 高度略高于上限
    manager_->checkAltitudeAlert(100.1f, 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，触发预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertJustBelowLower) {
    StreamCapture capture;
    
    // 高度略低于下限
    manager_->checkAltitudeAlert(-50.1f, 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);
}

// 异常输入测试：高度为极大值
TEST_F(AlertManagerTest, testCheckAltitudeAlertExtremeHigh) {
    StreamCapture capture;
    
    // 测试非常大的高度值
    manager_->checkAltitudeAlert(999999.0f, 8000);
    
    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, testCheckAltitudeAlertExtremeLow) {
    StreamCapture capture;
    
    // 测试非常小的高度值
    manager_->checkAltitudeAlert(-999999.0f, 9000);
    
    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：高度从异常恢复到正常，预警应解除
TEST_F(AlertManagerTest, testCheckAltitudeAlertRecovery) {
    StreamCapture capture;
    
    // 首先触发上限预警
    manager_->checkAltitudeAlert(150.0f, 10000);
    EXPECT_TRUE(manager_->hasActiveAlerts());
    
    // 然后高度恢复正常
    manager_->checkAltitudeAlert(50.0f, 10001);
    
    // 验证预警已解决
    EXPECT_FALSE(manager_->hasActiveAlerts());
    EXPECT_FALSE(manager_->hasUnacknowledgedAlerts());
    
    // 验证预警历史中存在已解决的记录
    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：同时触发上下限预警
TEST_F(AlertManagerTest, testCheckAltitudeAlertBothThresholds) {
    StreamCapture capture;
    
    // 先触发上限预警
    manager_->checkAltitudeAlert(150.0f, 11000);
    
    // 然后触发下限预警（此时上限预警应保持活动）
    manager_->checkAltitudeAlert(-100.0f, 11001);
    
    // 验证有两个活动预警
    auto active_alerts = manager_->getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 2);
    
    // 验证两个预警类型都存在
    bool has_upper = false, has_lower = false;
    for (const auto& alert : active_alerts) {
        if (alert.type == AlertType::ALTITUDE_UPPER) has_upper = true;
        if (alert.type == AlertType::ALTITUDE_LOWER) has_lower = true;
    }
    EXPECT_TRUE(has_upper);
    EXPECT_TRUE(has_lower);
}

// 特殊场景测试：重复触发相同预警，不应重复创建
TEST_F(AlertManagerTest, testCheckAltitudeAlertDuplicateTrigger) {
    StreamCapture capture;
    
    // 第一次触发上限预警
    manager_->checkAltitudeAlert(150.0f, 12000);
    
    // 再次触发相同的上限预警
    manager_->checkAltitudeAlert(200.0f, 12001);
    
    // 验证仍然只有一个活动预警
    auto active_alerts = manager_->getActiveAlerts();
    ASSERT_EQ(active_alerts.size(), 1);
    EXPECT_EQ(active_alerts[0].type, AlertType::ALTITUDE_UPPER);
}

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

// 正常输入测试：设置有效的阈值
TEST_F(AlertManagerTest, testSetAltitudeThresholdsValid) {
    StreamCapture capture;
    
    manager_->setAltitudeThresholds(200.0f, -100.0f);
    
    // 验证阈值已更新
    // 通过触发预警来验证
    manager_->checkAltitudeAlert(150.0f, 13000);  // 应低于新上限，不触发预警
    EXPECT_FALSE(manager_->hasActiveAlerts());
    
    manager_->checkAltitudeAlert(250.0f, 13001);  // 应高于新上限，触发预警
    EXPECT_TRUE(manager_->hasActiveAlerts());
    
    // 验证输出信息
    std::string output = capture.getCoutOutput();
    EXPECT_NE(output.find("预警阈值已更新"), std::string::npos);
    EXPECT_NE(output.find("200"), std::string::npos);
    EXPECT_NE(output.find("-100"), std::string::npos);
}

// 边界值测试：设置上限等于下限，应输出错误
TEST_F(AlertManagerTest, testSetAltitudeThresholdsEqual) {
    StreamCapture capture;
    
    manager_->setAltitudeThresholds(100.0f, 100.0f);
    
    // 验证错误输出
    std::string error_output = capture.getCerrOutput();
    EXPECT_NE(error_output.find("上限阈值必须大于下限阈值"), std::string::npos);
    
    // 验证阈值未改变
    manager_->checkAltitudeAlert(100.0f, 14000);  // 应等于上限，不触发预警
    EXPECT_FALSE(manager_->hasActiveAlerts());
    
    manager_->checkAltitudeAlert(100.1f, 14001);  // 应触发上限预警
    EXPECT_TRUE(manager_->hasActiveAlerts());
}

// 异常输入测试：设置上限小于下限，应输出错误
TEST_F(AlertManagerTest, testSetAltitudeThresholdsInvalid) {
    StreamCapture capture;
    
    manager_->setAltitudeThresholds(-50.0f, 100.0f);
    
    // 验证错误输出
    std::string error_output = capture.getCerrOutput();
    EXPECT_NE(error_output.find("上限阈值必须大于下限阈值"), std::string::npos);
    
    // 验证阈值未改变
    manager_->checkAltitudeAlert(150.0f, 15000);  // 应触发上限预警
    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：设置极大值阈值
TEST_F(AlertManagerTest, testSetAltitudeThresholdsExtremeValues) {
    StreamCapture capture;
    
    manager_->setAltitudeThresholds(10000.0f, -10000.0f);
    
    // 验证阈值生效
    manager_->checkAltitudeAlert(5000.0f, 16000);  // 在范围内
    EXPECT_FALSE(manager_->hasActiveAlerts());
    
    manager_->checkAltitudeAlert(15000.0f, 16001);  // 超出上限
    EXPECT_TRUE(manager_->hasActiveAlerts());
}

// 特殊场景测试：设置阈值后，原有预警应被重置
TEST_F(AlertManagerTest, testSetAltitudeThresholdsResetAlerts) {
    StreamCapture capture;
    
    // 先触发一个预警
    manager_->checkAltitudeAlert(150.0f, 17000);
    EXPECT_TRUE(manager_->hasActiveAlerts());
    
    // 设置新阈值
    manager_->setAltitudeThresholds(200.0f, -100.0f);
    
    // 验证原有预警已被重置
    EXPECT_FALSE(manager_->hasActiveAlerts());
    EXPECT_FALSE(manager_->hasUnacknowledgedAlerts());
}

// 特殊场景测试：多次设置阈值
TEST_F(AlertManagerTest, testSetAltitudeThresholdsMultipleTimes) {
    StreamCapture capture;
    
    // 第一次设置
    manager_->setAltitudeThresholds(200.0f, -100.0f);
    
    // 第二次设置
    manager_->setAltitudeThresholds(300.0f, -200.0f);
    
    // 验证最终阈值
    manager_->checkAltitudeAlert(250.0f, 18000);  // 在范围内
    EXPECT_FALSE(manager_->hasActiveAlerts());
    
    manager_->checkAltitudeAlert(350.0f, 18001);  // 超出上限
    EXPECT_TRUE(manager_->hasActiveAlerts());
}

// 特殊场景测试：设置阈值后立即检查高度
TEST_F(AlertManagerTest, testSetAltitudeThresholdsImmediateCheck) {
    StreamCapture capture;
    
    // 设置新阈值
    manager_->setAltitudeThresholds(150.0f, -50.0f);
    
    // 立即检查高度（原默认阈值100会触发预警，新阈值150不会）
    manager_->checkAltitudeAlert(120.0f, 19000);
    
    // 验证没有触发预警
    EXPECT_FALSE(manager_->hasActiveAlerts());
}

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