ChangeReasonCache.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * Copyright (C) 2025 Marco Craveiro <marco.craveiro@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */
#ifndef ORES_QT_CHANGE_REASON_CACHE_HPP
#define ORES_QT_CHANGE_REASON_CACHE_HPP
 
#include <vector>
#include <unordered_map>
#include <QObject>
#include <QFutureWatcher>
#include "ores.qt/ClientManager.hpp"
#include "ores.logging/make_logger.hpp"
#include "ores.dq.api/domain/change_reason.hpp"
#include "ores.dq.api/domain/change_reason_category.hpp"
 
namespace ores::qt {
 
class ChangeReasonCache final : public QObject {
    Q_OBJECT
 
private:
    inline static std::string_view logger_name = "ores.qt.change_reason_cache";
 
    [[nodiscard]] static auto& lg() {
        using namespace ores::logging;
        static auto instance = make_logger(logger_name);
        return instance;
    }
 
public:
    explicit ChangeReasonCache(ClientManager* clientManager,
        QObject* parent = nullptr);
    ~ChangeReasonCache() override = default;
 
    void loadAll();
 
    bool isLoaded() const { return is_loaded_; }
 
    bool isLoading() const { return is_loading_; }
 
    const std::vector<dq::domain::change_reason>& allReasons() const {
        return reasons_;
    }
 
    std::vector<dq::domain::change_reason> getReasonsForNew(
        const std::string& category_code) const;
 
    std::vector<dq::domain::change_reason> getReasonsForAmend(
        const std::string& category_code) const;
 
    std::vector<dq::domain::change_reason> getReasonsForDelete(
        const std::string& category_code) const;
 
    const dq::domain::change_reason* getReasonByCode(
        const std::string& code) const;
 
    bool isValidReasonCode(const std::string& code) const;
 
    const std::vector<dq::domain::change_reason_category>& allCategories() const {
        return categories_;
    }
 
signals:
    void loaded();
 
    void loadError(const QString& error_message);
 
    void refreshed();
 
private slots:
    void onReasonsLoaded();
    void onCategoriesLoaded();
    void onNotificationReceived(const QString& eventType,
        const QDateTime& timestamp, const QStringList& entityIds,
        const QString& tenantId);
 
private:
    void loadReasons();
    void loadCategories();
    void subscribeToEvents();
 
    struct ReasonsResult {
        bool success;
        std::vector<dq::domain::change_reason> reasons;
    };
 
    struct CategoriesResult {
        bool success;
        std::vector<dq::domain::change_reason_category> categories;
    };
 
    ClientManager* clientManager_;
 
    // Cached data
    std::vector<dq::domain::change_reason> reasons_;
    std::vector<dq::domain::change_reason_category> categories_;
 
    // Index for fast lookup by code
    std::unordered_map<std::string, std::size_t> reason_index_;
 
    // Loading state
    bool is_loaded_{false};
    bool is_loading_{false};
    bool reasons_loaded_{false};
    bool categories_loaded_{false};
 
    QFutureWatcher<ReasonsResult>* reasons_watcher_;
    QFutureWatcher<CategoriesResult>* categories_watcher_;
};
 
}
 
#endif