/*
 * objects.c
 *
 * Colloquium - A tiny presentation program
 *
 * Copyright (c) 2011 Thomas White <taw@bitwiz.org.uk>
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

#include "presentation.h"
#include "objects.h"
#include "mainwindow.h"


struct image_store
{
	int n_images;
	struct image **images;
};


static struct image *add_image_to_store(struct image_store *is, char *filename)
{
	struct image **images_new;
	struct image *i_new;
	int idx;
	GError *error = NULL;
	int w, h;

	i_new = calloc(1, sizeof(struct image));
	if ( i_new == NULL ) return NULL;

	images_new = realloc(is->images,
	                     (is->n_images+1)*sizeof(struct image *));
	if ( images_new == NULL ) {
		fprintf(stderr, "Couldn't allocate memory for image.\n");
		return NULL;
	}
	is->images = images_new;
	idx = is->n_images++;

	gdk_pixbuf_get_file_info(filename, &w, &h);

	/* FIXME: If image is huge, load a smaller version */
	i_new->pb = gdk_pixbuf_new_from_file(filename, &error);
	if ( i_new->pb == NULL ) {
		fprintf(stderr, "Failed to load image '%s'\n", filename);
		is->n_images--;
		return NULL;
	}
	i_new->filename = filename;
	i_new->refcount = 1;
	i_new->width = w;
	i_new->height = h;

	is->images[idx] = i_new;

	return i_new;
}


static struct image *find_filename(struct image_store *is, const char *filename)
{
	int i;

	for ( i=0; i<is->n_images; i++ ) {
		if ( strcmp(is->images[i]->filename, filename) == 0 ) {
			return is->images[i];
		}
	}

	return NULL;
}


struct image *get_image(struct image_store *is, char *filename)
{
	struct image *image;

	image = find_filename(is, filename);
	if ( image == NULL ) {
		image = add_image_to_store(is, filename);
	} else {
		image->refcount++;
	}

	return image;
}


void unref_image(struct image *i)
{
	i->refcount--;

	if ( i->refcount == 0 ) {
		/* FIXME: Delete image */
	}
}


struct image_store *image_store_new()
{
	struct image_store *is;

	is = calloc(1, sizeof(*is));
	if ( is == NULL ) return NULL;

	is->images = NULL;
	is->n_images = 0;

	return is;
}


void notify_style_update(struct presentation *p, struct style *sty)
{
	int i;
	int changed = 0;

	for ( i=0; i<p->num_slides; i++ ) {

		int j;
		struct slide *s;

		s = p->slides[i];

		for ( j=0; j<p->slides[i]->num_objects; j++ ) {

			if ( s->objects[j]->style != sty ) continue;

			s->objects[j]->update_object(s->objects[j]);
			if ( p->cur_edit_slide == s ) changed = 1;
			break;

		}

	}

	p->completely_empty = 0;
	if ( changed ) notify_slide_changed(p);  /* Trigger redraw etc */
}


void delete_object(struct object *o)
{
	if ( o->parent != NULL ) remove_object_from_slide(o->parent, o);
	o->delete_object(o);
	free(o);
}