/*
 * 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/>.
 */

#include <SDL.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "../tk.h"
#include "widget.h"

struct mftk_window {
	struct mftk_widget *root;
	struct mftk_widget *first;
	struct mftk_widget *focus;
};

struct mftk_window *
mftk_window_new(struct mftk_widget *root)
{
	struct mftk_window *w;

	w = calloc(1, sizeof(*w));
	if (w == NULL) {
		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
				"Couldn't create window: %s",
				strerror(errno));
		return NULL;
	}

	w->root = root;

	mftk_widget_layout(w->root);
	mftk_widget_index(w->root, w);
	w->focus = w->first;
	w->focus->focused = SDL_TRUE;
	mftk_widget_focus(w->focus);

	return w;
}

void
mftk_window_index(struct mftk_window *win, struct mftk_widget *wid)
{
	if (win->first == NULL) {
		win->first = wid;
		wid->prev = wid;
		wid->next = wid;
		return;
	}
	/*
	 * Head: win->first
	 * Tail: win->first->prev
	 */
	wid->prev              = win->first->prev;
	wid->next              = win->first;
	win->first->prev->next = wid;
	win->first->prev       = wid;
}

int
mftk_window_event(struct mftk_window *w, SDL_Event *e)
{
	switch (e->type) {
		case SDL_KEYDOWN:
			switch (e->key.keysym.sym) {
				case SDLK_TAB:
					w->focus->focused = SDL_FALSE;
					mftk_widget_defocus(w->focus);
					if (e->key.keysym.mod & KMOD_SHIFT) {
						w->focus = w->focus->prev;
					} else {
						w->focus = w->focus->next;
					}
					w->focus->focused = SDL_TRUE;
					mftk_widget_focus(w->focus);
					break;
				default:
					return mftk_widget_key_event(w->focus,
							e);
			}
			break;
		case SDL_MOUSEBUTTONUP:
			return mftk_widget_mouse_event(w->root, e, 0, 0);
		default:
			break;
	}

	return 0;
}

void
mftk_window_focus(struct mftk_window *win, struct mftk_widget *wid)
{
	win->focus->focused = SDL_FALSE;
	mftk_widget_defocus(win->focus);
	win->focus = wid;
	win->focus->focused = SDL_TRUE;
	mftk_widget_focus(win->focus);
}

int
mftk_window_render(struct mftk_window *w, SDL_Renderer *renderer)
{
	return mftk_widget_render(w->root, renderer, 0, 0);
}

void
mftk_window_destroy(struct mftk_window **w_p)
{
	struct mftk_window *w;

	if (w_p == NULL || *w_p == NULL) {
		return;
	}
	w = *w_p;

	mftk_widget_destroy(&w->root);
	free(w);
	w = NULL;
}