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#pragma once
#include "../facade/SDLContext.h"
#include "../types.h"
#include "../util/OptionalRef.h"
#include "System.h"
namespace crepe {
class Camera;
class Button;
class Transform;
/**
* \brief Handles the processing of input events created by SDLContext
*
* This system processes events such as mouse clicks, mouse movement, and keyboard
* actions. It is responsible for detecting interactions with UI buttons and
* passing the corresponding events to the registered listeners.
*/
class InputSystem : public System {
public:
using System::System;
/**
* \brief Updates the system, processing all input events.
* This method processes all events and triggers corresponding actions.
*/
void fixed_update() override;
private:
//! Stores the last position of the mouse when the button was pressed.
ivec2 last_mouse_down_position;
// TODO: specify world/hud space and make regular `vec2`
//! Stores the last mouse button pressed.
MouseButton last_mouse_button = MouseButton::NONE;
//! The maximum allowable distance between mouse down and mouse up to register as a click.
const int click_tolerance = 5;
/**
* \brief Handles the mouse click event.
* \param mouse_button The mouse button involved in the click.
* \param world_mouse_x The X coordinate of the mouse in world space.
* \param world_mouse_y The Y coordinate of the mouse in world space.
*
* This method processes the mouse click event and triggers the corresponding button action.
*/
void handle_click(const MouseButton & mouse_button, const int world_mouse_x,
const int world_mouse_y);
/**
* \brief Handles the mouse movement event.
* \param event_data The event data containing information about the mouse movement.
* \param world_mouse_x The X coordinate of the mouse in world space.
* \param world_mouse_y The Y coordinate of the mouse in world space.
*
* This method processes the mouse movement event and updates the button hover state.
*/
void handle_move(const SDLContext::EventData & event_data, const int world_mouse_x,
const int world_mouse_y);
/**
* \brief Checks if the mouse position is inside the bounds of the button.
* \param world_mouse_x The X coordinate of the mouse in world space.
* \param world_mouse_y The Y coordinate of the mouse in world space.
* \param button The button to check.
* \param transform The transform component of the button.
* \return True if the mouse is inside the button, false otherwise.
*/
bool is_mouse_inside_button(const int world_mouse_x, const int world_mouse_y,
const Button & button, const Transform & transform);
/**
* \brief Handles the button press event, calling the on_click callback if necessary.
* \param button The button being pressed.
*
* This method triggers the on_click action for the button when it is pressed.
*/
void handle_button_press(Button & button);
};
} // namespace crepe
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