ConfigManager.h

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/*
    MetaImGUI
    Copyright (C) 2026  A P Nicholson
 
    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, see <https://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <filesystem>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <vector>
 
namespace MetaImGUI {
 
class ConfigManager {
public:
    ConfigManager();
    // Out-of-line: pimpl member holds an incomplete type here, so unique_ptr's
    // deleter can't be instantiated until Impl is complete in the .cpp.
    ~ConfigManager();
 
    // Prevent copying but allow moving
    ConfigManager(const ConfigManager&) = delete;
    ConfigManager& operator=(const ConfigManager&) = delete;
    ConfigManager(ConfigManager&&) = default;
    ConfigManager& operator=(ConfigManager&&) = default;
 
    bool Load();
 
    bool Save();
 
    void Reset();
 
    [[nodiscard]] bool ConfigFileExists() const;
 
    [[nodiscard]] std::filesystem::path GetConfigPath() const;
 
    // Window settings
    void SetWindowPosition(int x, int y);
    void SetWindowSize(int width, int height);
    [[nodiscard]] std::optional<std::pair<int, int>> GetWindowPosition() const;
    [[nodiscard]] std::optional<std::pair<int, int>> GetWindowSize() const;
    void SetWindowMaximized(bool maximized);
    [[nodiscard]] bool GetWindowMaximized() const;
 
    // Theme settings
    void SetTheme(const std::string& theme);
    [[nodiscard]] std::string GetTheme() const;
 
    // Recent files
    void AddRecentFile(const std::string& filepath);
    [[nodiscard]] std::vector<std::string> GetRecentFiles() const;
    void ClearRecentFiles();
    void SetMaxRecentFiles(size_t max);
 
    // Generic settings (string key-value pairs)
    void SetString(const std::string& key, const std::string& value);
    [[nodiscard]] std::optional<std::string> GetString(const std::string& key) const;
 
    void SetInt(const std::string& key, int value);
    [[nodiscard]] std::optional<int> GetInt(const std::string& key) const;
 
    void SetBool(const std::string& key, bool value);
    [[nodiscard]] std::optional<bool> GetBool(const std::string& key) const;
 
    void SetFloat(const std::string& key, float value);
    [[nodiscard]] std::optional<float> GetFloat(const std::string& key) const;
 
    // Check if key exists
    [[nodiscard]] bool HasKey(const std::string& key) const;
 
    // Remove key
    void RemoveKey(const std::string& key);
 
    // Get all keys
    [[nodiscard]] std::vector<std::string> GetAllKeys() const;
 
private:
    struct Impl;
    std::unique_ptr<Impl> m_impl;
 
    // Helper to get config directory
    static std::filesystem::path GetConfigDirectory();
 
    // Helper to ensure config directory exists
    static bool EnsureConfigDirectoryExists();
};
 
} // namespace MetaImGUI