InputManager.hpp

#pragma once

#include "SDL.h"

#include <utility>

namespace KeyHandler {
	enum class KeyState {
		STILL_UP, // Key isn't pressed (has already been up for at least one frame)
		JUST_RELEASED, // Key has just been released
		STILL_DOWN, // Key is pressed (has already been down for at least one frame)
		JUST_PRESSED // Key has been pressed that frame
	};

	// enum Key and struct Keys must all have the same fields in the same order!
	enum class Key {
		UP, DOWN, LEFT, RIGHT,
		A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z,
		NUM_0, NUM_1, NUM_2, NUM_3, NUM_4, NUM_5, NUM_6, NUM_7, NUM_8, NUM_9,
		SPACE, RETURN, ESCAPE
	};

	struct Keys {
		KeyState UP, DOWN, LEFT, RIGHT,
			A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z,
			NUM_0, NUM_1, NUM_2, NUM_3, NUM_4, NUM_5, NUM_6, NUM_7, NUM_8, NUM_9,
			SPACE, RETURN, ESCAPE; //, SHIFT, TAB
	};

	const uint8_t KEY_COUNT = sizeof(Keys) / sizeof(KeyState);

	union KeyUnion {
		Keys keys;
		KeyState key_array[KEY_COUNT];
	};

	bool is_up(KeyState key_state); // Returns true if STILL_UP or JUST_RELEASED
	bool is_down(KeyState key_state); // Returns true if STILL_DOWN or JUST_PRESSED
	bool just_up(KeyState key_state); // Returns true if JUST_RELEASED
	bool just_down(KeyState key_state); // Returns true if JUST_PRESSED

	void update(KeyUnion& key_handler);

	void update_key(KeyUnion& key_handler, const SDL_Event& sdl_event);

	void set_key(KeyUnion& key_handler, Key key, KeyState key_state);
}

namespace MouseHandler {
	// TODO
}

class InputHandler {
public:
	InputHandler();

	void update();

	void handle_sdl_event(const SDL_Event& sdl_event);

	void set_key(KeyHandler::Key key, KeyHandler::KeyState key_state);

	KeyHandler::KeyUnion get_key_union();

private:
	KeyHandler::KeyUnion key_data;

	//TODO: mouse handler?
};