#include <psemek/sdl2/events.hpp>

#include <optional>
#include <SDL2/SDL.h>

namespace psemek::sdl2
{

	namespace
	{

		std::optional<app::mouse_button> mouse_button(Uint8 button)
		{
			switch (button)
			{
			case SDL_BUTTON_LEFT:
				return app::mouse_button::left;
			case SDL_BUTTON_MIDDLE:
				return app::mouse_button::middle;
			case SDL_BUTTON_RIGHT:
				return app::mouse_button::right;
			default:
				return std::nullopt;
			}
		}

		std::optional<app::keycode> keycode(SDL_Keysym)
		{
			return std::nullopt;
		}

	}

	bool poll_events(app::event_handler & handler)
	{
		for (SDL_Event e; SDL_PollEvent(&e);) switch (e.type)
		{
		case SDL_QUIT:
			return true;
		case SDL_WINDOWEVENT: switch (e.window.event)
			{
			case SDL_WINDOWEVENT_CLOSE:
				return true;
			case SDL_WINDOWEVENT_RESIZED:
				handler.on_event(app::resize_event{{e.window.data1, e.window.data2}});
				break;
			case SDL_WINDOWEVENT_SIZE_CHANGED:
				handler.on_event(app::resize_event{{e.window.data1, e.window.data2}});
				break;
			case SDL_WINDOWEVENT_FOCUS_GAINED:
				handler.on_event(app::focus_event{true});
				break;
			case SDL_WINDOWEVENT_FOCUS_LOST:
				handler.on_event(app::focus_event{false});
				break;
			}
			break;
		case SDL_MOUSEMOTION:
			handler.on_event(app::mouse_move_event{{e.motion.x, e.motion.y}});
			break;
		case SDL_MOUSEWHEEL:
			handler.on_event(app::mouse_wheel_event{e.wheel.y});
			break;
		case SDL_MOUSEBUTTONDOWN:
			if (auto button = mouse_button(e.button.button))
				handler.on_event(app::mouse_button_event{*button, true});
			break;
		case SDL_MOUSEBUTTONUP:
			if (auto button = mouse_button(e.button.button))
				handler.on_event(app::mouse_button_event{*button, false});
			break;
		case SDL_KEYDOWN:
			if (auto key = keycode(e.key.keysym))
				handler.on_event(app::key_event{*key, true});
			break;
		case SDL_KEYUP:
			if (auto key = keycode(e.key.keysym))
				handler.on_event(app::key_event{*key, false});
			break;
		}

		return false;
	}

}