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#pragma once
#include "facade/SDLContext.h"
#include "util/OptionalRef.h"
#include "System.h"
namespace crepe {
class Button;
class Transform;
/**
* \class InputSystem
* \brief Handles the processing of input events like mouse and keyboard interactions.
*
* 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 update() override;
private:
//! Stores the last position of the mouse when the button was pressed.
std::pair<int, int> last_mouse_down_position{-1, -1};
//! Stores the last mouse button pressed.
MouseButton last_mouse_button = MouseButton::NONE;
//! The tolerance in pixels for detecting a mouse click.
const int click_tolerance = 5;
/**
* \brief Handles the click event.
* \param eventData The event data containing information about the mouse click.
*
* This method processes the mouse click event and triggers the corresponding button action.
*/
void handle_click(const SDLContext::EventData & eventData);
/**
* \brief Handles the mouse movement event.
* \param eventData The event data containing information about the mouse movement.
*
* This method processes the mouse movement event and updates the button hover state.
*/
void handle_move(const SDLContext::EventData & eventData);
/**
* \brief Finds the transform component associated with a button.
* \param button The button to find the associated transform for.
* \param transforms A list of transforms to search through.
* \return A pointer to the transform of the button, or nullptr if not found.
*/
OptionalRef<Transform>
find_transform_for_button(Button & button,
std::vector<std::reference_wrapper<Transform>> & transforms);
/**
* \brief Checks if the mouse position is inside the bounds of the button.
* \param eventData The event data containing the mouse position.
* \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 SDLContext::EventData & eventData, 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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