/*
 * Copyright (C) 2021  P. J. McDermott
 *
 * This file is part of Maze Fight
 *
 * Maze Fight 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.
 *
 * Maze Fight 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 Maze Fight.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MFTK_WIDGET_H_
#define MFTK_WIDGET_H_

#include <SDL.h>
#include <stdarg.h>

void
mftk_window_index(struct mftk_window *win, struct mftk_widget *wid);

void
mftk_window_focus(struct mftk_window *win, struct mftk_widget *wid);

enum mftk_widget_role {
	MFTK_WIDGET_ROLE_NONE,
	MFTK_WIDGET_ROLE_FOCUSABLE,
	MFTK_WIDGET_ROLE_CONTAINER
};

struct mftk_widget {
	int                     w;
	int                     h;
	struct mftk_widget     *container;
	int                     vis;
	void                  (*layout)(struct mftk_widget *);
	void                  (*index)(struct mftk_widget *,
			struct mftk_window *);
	void                  (*focus)(struct mftk_widget *);
	void                  (*defocus)(struct mftk_widget *);
	int                   (*key_event)(struct mftk_widget *, SDL_Event *);
	int                   (*mouse_event)(struct mftk_widget *, SDL_Event *,
			int, int);
	int                   (*render)(struct mftk_widget *, SDL_Renderer *,
			int, int);
	void                  (*destroy)(struct mftk_widget *);
	enum mftk_widget_role   role;
	struct mftk_widget     *prev;
	struct mftk_widget     *next;
	struct mftk_window     *window;
	int                     focused;
};

struct mftk_widget *
mftk_widget_new(size_t size);

#define mftk_widget_init(w, t_w, name) \
	do { \
		w = mftk_widget_new(sizeof(struct mftk_##name)); \
		if (w == NULL) { \
			return NULL; \
		}; \
		w->layout      = &_mftk_##name##_layout; \
		w->mouse_event = &_mftk_##name##_mouse_event; \
		w->render      = &_mftk_##name##_render; \
		w->destroy     = &_mftk_##name##_destroy; \
		w->role = MFTK_WIDGET_ROLE_NONE; \
		t_w = (struct mftk_##name *) w; \
	} while (0)
#define mftk_widget_init_focusable(w, t_w, name) \
	do { \
		w = mftk_widget_new(sizeof(struct mftk_##name)); \
		if (w == NULL) { \
			return NULL; \
		}; \
		w->layout      = &_mftk_##name##_layout; \
		w->focus       = &_mftk_##name##_focus; \
		w->defocus     = &_mftk_##name##_defocus; \
		w->key_event   = &_mftk_##name##_key_event; \
		w->mouse_event = &_mftk_##name##_mouse_event; \
		w->render      = &_mftk_##name##_render; \
		w->destroy     = &_mftk_##name##_destroy; \
		w->role = MFTK_WIDGET_ROLE_FOCUSABLE; \
		t_w = (struct mftk_##name *) w; \
	} while (0)
#define mftk_widget_init_container(w, t_w, name) \
	do { \
		w = mftk_widget_new(sizeof(struct mftk_##name)); \
		if (w == NULL) { \
			return NULL; \
		}; \
		w->layout      = &_mftk_##name##_layout; \
		w->index       = &_mftk_##name##_index; \
		w->mouse_event = &_mftk_##name##_mouse_event; \
		w->render      = &_mftk_##name##_render; \
		w->destroy     = &_mftk_##name##_destroy; \
		w->role = MFTK_WIDGET_ROLE_CONTAINER; \
		t_w = (struct mftk_##name *) w; \
	} while (0)

void
mftk_widget_set_visible(struct mftk_widget *w, int v);

int
mftk_widget_get_visible(struct mftk_widget *w)
	__attribute__((__pure__));

void
mftk_widget_layout(struct mftk_widget *w);

void
mftk_widget_index(struct mftk_widget *w, struct mftk_window *win);

void
mftk_widget_focus(struct mftk_widget *w);

void
mftk_widget_defocus(struct mftk_widget *w);

int
mftk_widget_mouse_event(struct mftk_widget *w, SDL_Event *e, int x, int y);

int
mftk_widget_key_event(struct mftk_widget *w, SDL_Event *e);

int
mftk_widget_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y);

void
mftk_widget_destroy(struct mftk_widget **w);

struct mftk_widget *
mftk_grid_new_a(int rows, int cols, int row_spacing, int col_spacing,
		struct mftk_widget **children, int *alignments);

enum mftk_check_shape {
	MFTK_CHECK_SHAPE_BOX,
	MFTK_CHECK_SHAPE_CIR
};

void
mftk_check_set_shape(struct mftk_widget *w, enum mftk_check_shape shape);

void
mftk_check_set_state(struct mftk_widget *w, int state);

void
mftk_check_set_steals_focus(struct mftk_widget *w, int steals_focus);

#endif  /* MFTK_WIDGET_H_ */