/* Copyright (C) 2019 Nunuhara Cabbage <nunuhara@haniwa.technology>
 *
 * 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 2 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://gnu.org/licenses/>.
 */

#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <SDL.h>
#include "system4.h"
#include "ald.h"
#include "cg.h"
#include "qnt.h"
#include "graphics.h"

bool cg_exists(int no)
{
	return ald[ALDFILE_CG] && ald_data_exists(ald[ALDFILE_CG], no);
}

/*
 * Identify cg format
 *   data: pointer to compressed data
 *   return: cg type
 */
static enum cg_type check_cgformat(uint8_t *data)
{
	if (qnt_checkfmt(data)) {
		return ALCG_QNT;
	}
	WARNING("Unknown CG type");
	return ALCG_UNKNOWN;
}

void _cg_free(struct cg *cg)
{
	if (!cg)
		return;
	if (cg->s) {
		if (cg->pixel_alloc)
			free(cg->s->pixels);
		SDL_FreeSurface(cg->s);
	}
}

/*
 * Free CG data
 *  cg: object to free
 */
void cg_free(struct cg *cg)
{
	_cg_free(cg);
	free(cg);
}

/*
 * Load cg data from file or cache
 *  no: file no ( >= 0)
 *  return: cg object(extracted)
*/
bool cg_load(struct cg *cg, int no)
{
	struct archive_data *dfile;
	int type, possibly_unused size = 0;

	if (!(dfile = ald_get(ald[ALDFILE_CG], no))) {
		WARNING("Failed to load CG %d", no);
		return false;
	}

	// check loaded cg format
	type = check_cgformat(dfile->data);

	// extract cg
	//  size is only pixel data size
	switch(type) {
	case ALCG_QNT:
		cg->type = ALCG_QNT;
		cg->s = qnt_extract(dfile->data);
		cg->pixel_alloc = true;
		break;
	case ALCG_AJP:
		// TODO
		break;
	case ALCG_PNG:
		// TODO
		break;
	default:
		break;
	}

	// ok to free
	ald_free_data(dfile);

	return true;
}

void _cg_init(struct cg *cg)
{
	cg->pixel_alloc = false;
	cg->s = NULL;
}

void cg_reinit(struct cg *cg)
{
	_cg_free(cg);
	_cg_init(cg);
}

struct cg *cg_init(void)
{
	struct cg *cg = calloc(1, sizeof(struct cg));
	_cg_init(cg);
	return cg;
}