/**************************************************************************/
/*  image_resource_format.cpp                                             */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
/*                                                                        */
/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
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/**************************************************************************/

#include "image_resource_format.h"

Ref<Resource> ResourceFormatLoaderImage::load(const String &p_path, const String &p_original_path, Error *r_error, bool p_use_sub_threads, float *r_progress, CacheMode p_cache_mode) {
	Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ);
	if (f.is_null()) {
		if (r_error) {
			*r_error = ERR_CANT_OPEN;
		}
		return Ref<Resource>();
	}

	uint8_t header[4] = { 0, 0, 0, 0 };
	f->get_buffer(header, 4);

	bool unrecognized = header[0] != 'G' || header[1] != 'D' || header[2] != 'I' || header[3] != 'M';
	if (unrecognized) {
		if (r_error) {
			*r_error = ERR_FILE_UNRECOGNIZED;
		}
		ERR_FAIL_V(Ref<Resource>());
	}

	String extension = f->get_pascal_string();

	int idx = -1;

	for (int i = 0; i < ImageLoader::loader.size(); i++) {
		if (ImageLoader::loader[i]->recognize(extension)) {
			idx = i;
			break;
		}
	}

	if (idx == -1) {
		if (r_error) {
			*r_error = ERR_FILE_UNRECOGNIZED;
		}
		ERR_FAIL_V(Ref<Resource>());
	}

	Ref<Image> image;
	image.instantiate();

	Error err = ImageLoader::loader.write[idx]->load_image(image, f);

	if (err != OK) {
		if (r_error) {
			*r_error = err;
		}
		return Ref<Resource>();
	}

	if (r_error) {
		*r_error = OK;
	}

	return image;
}

void ResourceFormatLoaderImage::get_recognized_extensions(List<String> *p_extensions) const {
	p_extensions->push_back("image");
}

bool ResourceFormatLoaderImage::handles_type(const String &p_type) const {
	return p_type == "Image";
}

String ResourceFormatLoaderImage::get_resource_type(const String &p_path) const {
	return p_path.get_extension().to_lower() == "image" ? "Image" : String();
}