// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <map>
#include <QKeySequence>
#include <QString>

class QDialog;
class QSettings;
class QShortcut;
class QWidget;

class HotkeyRegistry final {
public:
    friend class ConfigureHotkeys;

    explicit HotkeyRegistry();
    ~HotkeyRegistry();

    /**
     * Loads hotkeys from the settings file.
     *
     * @note Yet unregistered hotkeys which are present in the settings will automatically be
     *       registered.
     */
    void LoadHotkeys();

    /**
     * Saves all registered hotkeys to the settings file.
     *
     * @note Each hotkey group will be stored a settings group; For each hotkey inside that group, a
     *       settings group will be created to store the key sequence and the hotkey context.
     */
    void SaveHotkeys();

    /**
     * Returns a QShortcut object whose activated() signal can be connected to other QObjects'
     * slots.
     *
     * @param group  General group this hotkey belongs to (e.g. "Main Window", "Debugger").
     * @param action Name of the action (e.g. "Start Emulation", "Load Image").
     * @param widget Parent widget of the returned QShortcut.
     * @warning If multiple QWidgets' call this function for the same action, the returned QShortcut
     *          will be the same. Thus, you shouldn't rely on the caller really being the
     *          QShortcut's parent.
     */
    QShortcut* GetHotkey(const QString& group, const QString& action, QObject* widget);

    /**
     * Returns a QKeySequence object whose signal can be connected to QAction::setShortcut.
     *
     * @param group  General group this hotkey belongs to (e.g. "Main Window", "Debugger").
     * @param action Name of the action (e.g. "Start Emulation", "Load Image").
     */
    QKeySequence GetKeySequence(const QString& group, const QString& action);

    /**
     * Returns a Qt::ShortcutContext object who can be connected to other
     * QAction::setShortcutContext.
     *
     * @param group  General group this shortcut context belongs to (e.g. "Main Window",
     * "Debugger").
     * @param action Name of the action (e.g. "Start Emulation", "Load Image").
     */
    Qt::ShortcutContext GetShortcutContext(const QString& group, const QString& action);

private:
    struct Hotkey {
        QKeySequence keyseq;
        QString controller_keyseq;
        QShortcut* shortcut = nullptr;
        Qt::ShortcutContext context = Qt::WindowShortcut;
    };

    using HotkeyMap = std::map<QString, Hotkey>;
    using HotkeyGroupMap = std::map<QString, HotkeyMap>;

    HotkeyGroupMap hotkey_groups;
};