/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code 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.
 *
 * Antkeeper source code 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 Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef ANTKEEPER_INPUT_EVENT_HPP
#define ANTKEEPER_INPUT_EVENT_HPP

#include "input/gamepad-axis.hpp"
#include "input/gamepad-button.hpp"
#include "input/mouse-motion-axis.hpp"
#include "input/mouse-scroll-axis.hpp"
#include "input/scancode.hpp"
#include "input/mapping.hpp"
#include "input/modifier-key.hpp"
#include "math/vector.hpp"
#include <cstdint>
#include <memory>

namespace input {

class control;
class device;
class gamepad;
class keyboard;
class mouse;

/**
 * Input events.
 */
namespace event {

/**
 * Event generated when a control has been activated.
 */
struct control_activated
{
	/// Control that was activated.
	control* control;
};

/**
 * Event generated while a control is active.
 */
struct control_active
{
	/// Active control.
	control* control;
	
	/// Control input value.
	float input_value;
};

/**
 * Event generated when a control has been deactivated.
 */
struct control_deactivated
{
	/// Control that was deactivated.
	control* control;
};

/**
 * Event generated when an input mapping has been generated.
 */
struct input_mapped
{
	/// Input mapping that was generated.
	std::shared_ptr<mapping> mapping;
};

/**
 * Event generated when an input device has been connected.
 */
struct device_connected
{
	/// Device that was connected.
	device* device;
};

/**
 * Event generated when an input device has been disconnected.
 */
struct device_disconnected
{
	/// Device that was disconnected.
	device* device;
};

/**
 * Event generated when a gamepad button has been pressed.
 */
struct gamepad_button_pressed
{
	/// Gamepad that generated the event.
	gamepad* gamepad;
	
	/// Gamepad button being pressed.
	gamepad_button button;
};

/**
 * Event generated when a gamepad button has been released.
 */
struct gamepad_button_released
{
	/// Gamepad that generated the event.
	gamepad* gamepad;
	
	/// Gamepad button being released.
	gamepad_button button;
};

/**
 * Event generated when a gamepad axis has been moved.
 */
struct gamepad_axis_moved
{
	/// Gamepad that generated the event.
	gamepad* gamepad;
	
	/// Gamepad axis being moved.
	gamepad_axis axis;
	
	/// Position of the gamepad axis, on `[-1, 1]`.
	float position;
};

/**
 * Event generated when a keyboard key has been pressed.
 */
struct key_pressed
{
	/// Keyboard that generated the event.
	keyboard* keyboard;
	
	/// Scancode of the key being pressed.
	scancode scancode;
	
	/// `true` if the key press was generated by a key repeat, `false` otherwise.
	bool repeat;
	
	/// Bit mask containing the active modifier keys.
	std::uint16_t modifiers;
};

/**
 * Event generated when a keyboard key has been released.
 */
struct key_released
{
	/// Keyboard that generated the event.
	keyboard* keyboard;
	
	/// Scancode of the key being released.
	scancode scancode;
	
	/// `true` if the key release was generated by a key repeat, `false` otherwise.
	bool repeat;
	
	/// Bit mask containing the active modifier keys.
	std::uint16_t modifiers;
};

/**
 * Event generated when a mouse has been moved.
 */
struct mouse_moved
{
	/// Mouse that generated the event.
	mouse* mouse;
	
	/// Mouse position, in pixels, relative to the window.
	math::vector<std::int32_t, 2> position;
	
	/// Relative movement of the mouse, in pixels.
	math::vector<std::int32_t, 2> difference;
};

/**
 * Event generated when a mouse button has been pressed.
 */
struct mouse_button_pressed
{
	/// Mouse that generated the event.
	mouse* mouse;
	
	/// Mouse position, in pixels, relative to the window, when the button was pressed.
	math::vector<std::int32_t, 2> position;
	
	/// Mouse button being pressed.
	mouse_button button;
};

/**
 * Event generated when a mouse button has been released.
 */
struct mouse_button_released
{
	/// Mouse that generated the event.
	mouse* mouse;
	
	/// Mouse position, in pixels, relative to the window, when the button was released.
	math::vector<std::int32_t, 2> position;
	
	/// Mouse button being released.
	mouse_button button;
};

/**
 * Event generated when a mouse has been scrolled.
 */
struct mouse_scrolled
{
	/// Mouse that generated the event.
	mouse* mouse;
	
	/// Mouse position, in pixels, relative to the window, when the mouse was scrolled.
	math::vector<std::int32_t, 2> position;
	
	/// Scroll velocity.
	math::vector<float, 2> velocity;
};

/**
 * Event generated when a window has been requested to close.
 */
struct window_closed
{
	/// Pointer to the window that has been requested to close.
	void* window;
};

/**
 * Event generated when a window has gained or lost focus.
 */
struct window_focus_changed
{
	/// Pointer to the window that has gained or lost focus.
	void* window;
	
	/// `true` if the window is in focus, `false` otherwise.
	bool in_focus;
};

/**
 * Event generated when a window has been moved.
 */
struct window_moved
{
	/// Pointer to the window that has been moved.
	void* window;
	
	/// Position of the window, in pixels.
	math::vector<std::int32_t, 2> position;
	
	/// `true` if the window is maximized, `false` otherwise.
	bool maximized;
	
	/// `true` if the window is fullscreen, `false` otherwise.
	bool fullscreen;
};

/**
 * Event generated when a window has been maximized.
 */
struct window_maximized
{
	/// Pointer to the window that has been maximized.
	void* window;
};

/**
 * Event generated when a window has been minimized.
 */
struct window_minimized
{
	/// Pointer to the window that has been minimized.
	void* window;
};

/**
 * Event generated when a window has been restored.
 */
struct window_restored
{
	/// Pointer to the window that has been restored.
	void* window;
};

/**
 * Event generated when a window has been resized.
 */
struct window_resized
{
	/// Pointer to the window that has been resized.
	void* window;
	
	/// Window size, in display units.
	math::vector<std::int32_t, 2> size;
	
	/// `true` if the window is maximized, `false` otherwise.
	bool maximized;
	
	/// `true` if the window is fullscreen, `false` otherwise.
	bool fullscreen;
	
	/// Window viewport size, in pixels.
	math::vector<std::int32_t, 2> viewport_size;
};

} // namespace event
} // namespace input

#endif // ANTKEEPER_INPUT_EVENT_HPP