/*
 This file is part of Telegram Desktop,
 the official desktop version of Telegram messaging app, see https://telegram.org

 Telegram Desktop 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.

 It 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.

 Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
 Copyright (c) 2014-2016 John Preston, https://desktop.telegram.org
 */
#pragma once

#include "styles/style_widgets.h"
#include "ui/effects/rect_shadow.h"
#include "ui/widgets/inner_dropdown.h"
#include "ui/widgets/menu.h"

namespace Ui {

class DropdownMenu : public InnerDropdown {
	Q_OBJECT

public:
	DropdownMenu(QWidget *parent, const style::DropdownMenu &st = st::defaultDropdownMenu);

	QAction *addAction(const QString &text, const QObject *receiver, const char* member, const style::icon *icon = nullptr, const style::icon *iconOver = nullptr);
	QAction *addAction(const QString &text, base::lambda_unique<void()> callback, const style::icon *icon = nullptr, const style::icon *iconOver = nullptr);
	QAction *addSeparator();
	void clearActions();

	void setHiddenCallback(base::lambda_unique<void()> callback) {
		_hiddenCallback = std_::move(callback);
	}

	using Actions = Ui::Menu::Actions;
	Actions &actions();

	~DropdownMenu();

protected:
	void focusOutEvent(QFocusEvent *e) override;
	void hideEvent(QHideEvent *e) override;

	void keyPressEvent(QKeyEvent *e) override {
		forwardKeyPress(e->key());
	}
	void mouseMoveEvent(QMouseEvent *e) override {
		forwardMouseMove(e->globalPos());
	}
	void mousePressEvent(QMouseEvent *e) override {
		forwardMousePress(e->globalPos());
	}

private slots:
	void onHidden() {
		hideFinish();
	}

private:
	// Not ready with submenus yet.
	DropdownMenu(QWidget *parent, QMenu *menu, const style::DropdownMenu &st = st::defaultDropdownMenu);
	void deleteOnHide(bool del);
	void popup(const QPoint &p);
	void hideMenu(bool fast = false);

	void childHiding(DropdownMenu *child);

	void init();
	void hideFinish();

	using TriggeredSource = Ui::Menu::TriggeredSource;
	void handleActivated(QAction *action, int actionTop, TriggeredSource source);
	void handleTriggered(QAction *action, int actionTop, TriggeredSource source);
	void forwardKeyPress(int key);
	bool handleKeyPress(int key);
	void forwardMouseMove(QPoint globalPosition) {
		_menu->handleMouseMove(globalPosition);
	}
	void handleMouseMove(QPoint globalPosition);
	void forwardMousePress(QPoint globalPosition) {
		_menu->handleMousePress(globalPosition);
	}
	void handleMousePress(QPoint globalPosition);

	using SubmenuPointer = QPointer<DropdownMenu>;
	bool popupSubmenuFromAction(QAction *action, int actionTop, TriggeredSource source);
	void popupSubmenu(SubmenuPointer submenu, int actionTop, TriggeredSource source);
	void showMenu(const QPoint &p, DropdownMenu *parent, TriggeredSource source);

	const style::DropdownMenu &_st;
	base::lambda_unique<void()> _hiddenCallback;

	ChildWidget<Ui::Menu> _menu;

	// Not ready with submenus yet.
	//using Submenus = QMap<QAction*, SubmenuPointer>;
	//Submenus _submenus;

	DropdownMenu *_parent = nullptr;

	SubmenuPointer _activeSubmenu;

	bool _deleteOnHide = false;
	bool _triggering = false;
	bool _deleteLater = false;

};

} // namespace Ui