/* ***********************************************************************
//
//   Copyright (C) 2025 -- The 4D-STAR Collaboration
//   File Author: Emily Boudreaux
//   Last Modified: March 20, 2025
//
//   4DSSE is free software; you can use it and/or modify
//   it under the terms and restrictions the GNU General Library Public
//   License version 3 (GPLv3) as published by the Free Software Foundation.
//
//   4DSSE is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//   See the GNU Library General Public License for more details.
//
//   You should have received a copy of the GNU Library General Public License
//   along with this software; if not, write to the Free Software
//   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// *********************************************************************** */
#ifndef RESOURCE_MANAGER_H
#define RESOURCE_MANAGER_H

#include <vector>
#include <string>
#include <stdexcept>
#include <unordered_map>

#include "resourceManagerTypes.h"
#include "config.h"
#include "probe.h"
#include "quill/LogMacros.h"

/**
 * @class ResourceManager
 * @brief Manages resources within the application.
 *
 * The ResourceManager class is responsible for loading, storing, and providing access to resources.
 * It follows the Singleton design pattern to ensure only one instance of the manager exists.
 */
class ResourceManager {
private:
    /**
     * @brief Private constructor to prevent instantiation.
     */
    ResourceManager();

    /**
     * @brief Deleted copy constructor to prevent copying.
     */
    ResourceManager(const ResourceManager&) = delete;

    /**
     * @brief Deleted assignment operator to prevent assignment.
     */
    ResourceManager& operator=(const ResourceManager&) = delete;

    Config& m_config = Config::getInstance();
    Probe::LogManager& m_logManager = Probe::LogManager::getInstance();
    quill::Logger* m_logger = m_logManager.getLogger("log");

    Config m_resourceConfig;
    std::string m_dataDir;
    std::unordered_map<std::string, Resource> m_resources;

    /**
     * @brief Loads a resource by name.
     * @param name The name of the resource to load.
     * @return True if the resource was loaded successfully, false otherwise.
     */
    bool load(const std::string& name);

public:
    /**
     * @brief Gets the singleton instance of the ResourceManager.
     * @return The singleton instance of the ResourceManager.
     */
    static ResourceManager& getInstance() {
        static ResourceManager instance;
        return instance;
    }

    /**
     * @brief Gets a list of available resources.
     * @return A vector of strings containing the names of available resources.
     *
     * Example usage:
     * @code
     * ResourceManager& manager = ResourceManager::getInstance();
     * std::vector<std::string> resources = manager.getAvaliableResources();
     * @endcode
     */
    std::vector<std::string> getAvaliableResources() const;

    /**
     * @brief Gets a resource by name.
     * @param name The name of the resource to retrieve.
     * @return A constant reference to the requested resource.
     * @throws std::runtime_error if the resource is not found.
     *
     * Example usage:
     * @code
     * ResourceManager& manager = ResourceManager::getInstance();
     * const Resource& resource = manager.getResource("exampleResource");
     * @endcode
     */
    const Resource& getResource(const std::string &name) const;
    
    /**
     * @brief Loads a resource by name.
     * @param name The name of the resource to load.
     * @return True if the resource was loaded successfully, false otherwise.
     *
     * Example usage:
     * @code
     * ResourceManager& manager = ResourceManager::getInstance();
     * bool success = manager.loadResource("exampleResource");
     * @endcode
     */
    bool loadResource(std::string& name);

    /**
     * @brief Loads all resources.
     * @return An unordered map with resource names as keys and load success as values.
     *
     * Example usage:
     * @code
     * ResourceManager& manager = ResourceManager::getInstance();
     * std::unordered_map<std::string, bool> results = manager.loadAllResources();
     * @endcode
     */
    std::unordered_map<std::string, bool> loadAllResources();
};

#endif // RESOURCE_MANAGER_H