#include "PathManager.h"
#include <QtCore/QCoreApplication>
#include <QtCore/QFileInfo>
#include <QtCore/QDir>
#include <QtCore/QStandardPaths>
#include <QtCore/QFile>
#include <stdexcept>
#include "VrLog.h"

// 静态成员初始化
PathManager* PathManager::s_instance = nullptr;
std::mutex PathManager::s_mutex;

PathManager::PathManager(const QString& appName)
    : m_appName(appName)
{
    // 初始化时计算并缓存所有路径
    m_configDirectory = GetConfigDirectory();
    EnsureConfigDirectoryExists();

    m_configFilePath = m_configDirectory + "/config.xml";
    m_calibrationFilePath = m_configDirectory + "/EyeHandCalibMatrixInfo.ini";

    LOG_INFO("PathManager initialized for app: %s\n", appName.toStdString().c_str());
    LOG_INFO("Config directory: %s\n", m_configDirectory.toStdString().c_str());
}

PathManager& PathManager::GetInstance()
{
    std::lock_guard<std::mutex> lock(s_mutex);
    
    if (s_instance == nullptr) {
        // 自动从应用程序路径获取应用名称
        QString appFilePath = QCoreApplication::applicationFilePath();
        QString appName = QFileInfo(appFilePath).baseName();
        
        LOG_INFO("Auto-detected application name: %s\n", appName.toStdString().c_str());
        
        s_instance = new PathManager(appName);
    }
    return *s_instance;
}

QString PathManager::GetConfigFilePath() const
{
    return m_configFilePath;
}

QString PathManager::GetCalibrationFilePath() const
{
    return m_calibrationFilePath;
}

QString PathManager::GetAppConfigDirectory() const
{
    return m_configDirectory;
}

QString PathManager::GetConfigDirectory() const
{
    QString baseDir;
#ifdef _WIN32
    // Windows系统：使用程序目录
    baseDir = GetProgramDirectory();
#else
    // Linux系统：使用用户配置目录
    baseDir = GetUserConfigDirectory();
#endif
    // 使用类成员变量中存储的应用名称，避免重复获取
    return baseDir + "/../" + m_appName + "/Config";
}

bool PathManager::EnsureConfigDirectoryExists()
{
    if (QDir().exists(m_configDirectory)) {
        return true;
    }

    LOG_INFO("Creating configuration directory: %s\n", m_configDirectory.toStdString().c_str());

    bool success = QDir().mkpath(m_configDirectory);
    if (success) {
        LOG_INFO("Configuration directory created successfully\n");
    } else {
        LOG_ERROR("Failed to create configuration directory: %s\n", m_configDirectory.toStdString().c_str());
    }

    return success;
}

QString PathManager::GetProgramDirectory() const
{
    QString exePath = QCoreApplication::applicationFilePath();
    return QFileInfo(exePath).absoluteDir().path();
}

QString PathManager::GetUserConfigDirectory() const
{
    return QStandardPaths::writableLocation(QStandardPaths::ConfigLocation);
}