#ifndef SYSTEM_MONITOR_H
#define SYSTEM_MONITOR_H

#include <string>
#include <vector>
#include <cstdint> // for standard integer types like uint64_t

namespace SystemMonitor {

// --- 1. 定义数据结构体 ---

struct SystemInfo {
    std::string kernelVersion;
    std::string kernelRelease;
    std::string architecture;
};

struct StorageDevice {
    std::string filesystem;
    std::string type;
    std::string totalSize;
    std::string usedSize;
    std::string availableSize;
    std::string usePercentage;
    std::string mountPoint;
};

struct MemoryInfo {
    uint64_t total_kb = 0;
    // 未来可以添加 free, available, cached 等
};

struct ThermalInfo {
    std::string zoneName;
    double temperatureCelsius = 0.0;
};

struct CpuUtilization {
    double totalUsagePercentage = 0.0;
    // 未来可以添加每个核心的利用率
};

// --- 2. 定义 SystemMonitor 类 ---

class SystemMonitor {
public:
    SystemMonitor() = default;

    // --- 数据采集接口 ---
    SystemInfo getSystemInfo() const;
    std::vector<StorageDevice> getStorageInfo() const;
    MemoryInfo getMemoryInfo() const;
    std::vector<ThermalInfo> getChipTemperature() const;
    CpuUtilization getCpuUtilization(int interval_ms = 1000) const;
    std::string getKernelLogs(int last_n_lines = 20) const;

private:
    // --- 核心工具函数（现在作为私有成员）---
    std::string readFile(const std::string& filePath) const;
    std::string execCommand(const char* cmd) const;

    // 用于计算CPU利用率的内部状态
    mutable uint64_t prev_idle_ = 0;
    mutable uint64_t prev_total_ = 0;
};

} // namespace SystemMonitor

#endif // SYSTEM_MONITOR_H