pagination_context.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * Copyright (C) 2026 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_SHELL_APP_PAGINATION_CONTEXT_HPP
#define ORES_SHELL_APP_PAGINATION_CONTEXT_HPP
 
#include <string>
#include <cstdint>
#include <functional>
#include <unordered_map>
 
namespace ores::shell::app {
 
struct entity_page_state {
    std::uint32_t current_offset = 0;
    std::uint32_t total_count = 0;
};
 
using list_callback = std::function<void(std::ostream&)>;
 
class pagination_context {
public:
    pagination_context() = default;
 
    std::uint32_t page_size() const;
 
    void set_page_size(std::uint32_t size);
 
    entity_page_state& state_for(const std::string& entity_name);
 
    const std::string& last_entity() const;
 
    void set_last_entity(const std::string& name);
 
    void register_list_callback(const std::string& entity_name,
                                list_callback callback);
 
    const list_callback* get_list_callback(const std::string& entity_name) const;
 
private:
    std::uint32_t page_size_ = 20;
    std::string last_entity_;
    std::unordered_map<std::string, entity_page_state> entity_states_;
    std::unordered_map<std::string, list_callback> list_callbacks_;
};
 
}
 
#endif