/*************************************************************************/
/*  resource_format_image.cpp                                            */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
/*                                                                       */
/* 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,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "resource_format_image.h"
#include "globals.h"
#include "io/image_loader.h"
#include "os/os.h"
#include "scene/resources/texture.h"
RES ResourceFormatLoaderImage::load(const String &p_path, const String &p_original_path, Error *r_error) {

	if (r_error)
		*r_error = ERR_CANT_OPEN;

	if (p_path.extension() == "cube") {
		// open as cubemap txture

		CubeMap *ptr = memnew(CubeMap);
		Ref<CubeMap> cubemap(ptr);

		Error err;
		FileAccess *f = FileAccess::open(p_path, FileAccess::READ, &err);
		if (err) {

			ERR_FAIL_COND_V(err, RES());
		}

		String base_path = p_path.substr(0, p_path.find_last("/") + 1);

		for (int i = 0; i < 6; i++) {

			String file = f->get_line().strip_edges();
			Image image;

			Error err = ImageLoader::load_image(base_path + file, &image);

			if (err) {

				memdelete(f);
				ERR_FAIL_COND_V(err, RES());
			}

			if (i == 0) {

				//cubemap->create(image.get_width(),image.get_height(),image.get_format(),Texture::FLAGS_DEFAULT|Texture::FLAG_CUBEMAP);
			}

			static const CubeMap::Side cube_side[6] = {
				CubeMap::SIDE_LEFT,
				CubeMap::SIDE_RIGHT,
				CubeMap::SIDE_BOTTOM,
				CubeMap::SIDE_TOP,
				CubeMap::SIDE_FRONT,
				CubeMap::SIDE_BACK
			};

			cubemap->set_side(cube_side[i], image);
		}

		memdelete(f);

		cubemap->set_name(p_path.get_file());
		if (r_error)
			*r_error = OK;

		return cubemap;

	} else {
		// simple image

		ImageTexture *ptr = memnew(ImageTexture);
		Ref<ImageTexture> texture(ptr);

		uint64_t begtime;
		double total;

		Image image;

		if (debug_load_times)
			begtime = OS::get_singleton()->get_ticks_usec();

		Error err = ImageLoader::load_image(p_path, &image);

		if (!err && debug_load_times) {
			double total = USEC_TO_SEC((OS::get_singleton()->get_ticks_usec() - begtime));
			print_line("Image: " + itos(image.get_width()) + "x" + itos(image.get_height()));
			print_line("  -load: " + rtos(total));
		}

		ERR_EXPLAIN("Failed loading image: " + p_path);
		ERR_FAIL_COND_V(err, RES());
		if (r_error)
			*r_error = ERR_FILE_CORRUPT;

#ifdef DEBUG_ENABLED
#ifdef TOOLS_ENABLED

		if (max_texture_size && (image.get_width() > max_texture_size || image.get_height() > max_texture_size)) {

			if (bool(Globals::get_singleton()->get("debug/max_texture_size_alert"))) {
				OS::get_singleton()->alert("Texture is too large: '" + p_path + "', at " + itos(image.get_width()) + "x" + itos(image.get_height()) + ". Max allowed size is: " + itos(max_texture_size) + "x" + itos(max_texture_size) + ".", "BAD ARTIST, NO COOKIE!");
			}

			ERR_EXPLAIN("Texture is too large: '" + p_path + "', at " + itos(image.get_width()) + "x" + itos(image.get_height()) + ". Max allowed size is: " + itos(max_texture_size) + "x" + itos(max_texture_size) + ".");
			ERR_FAIL_V(RES());
		}
#endif
#endif

		uint32_t flags = load_image_flags(p_path);

		if (debug_load_times)
			begtime = OS::get_singleton()->get_ticks_usec();

		//print_line("img: "+p_path+" flags: "+itos(flags));
		texture->create_from_image(image, flags);
		texture->set_name(p_path.get_file());

		if (debug_load_times) {
			total = USEC_TO_SEC(OS::get_singleton()->get_ticks_usec() - begtime);
			print_line("  -make texture: " + rtos(total));
		}

		if (r_error)
			*r_error = OK;

		return RES(texture);
	}
}

uint32_t ResourceFormatLoaderImage::load_image_flags(const String &p_path) {

	FileAccess *f2 = FileAccess::open(p_path + ".flags", FileAccess::READ);
	Map<String, bool> flags_found;
	if (f2) {

		while (!f2->eof_reached()) {
			String l2 = f2->get_line();
			int eqpos = l2.find("=");
			if (eqpos != -1) {
				String flag = l2.substr(0, eqpos).strip_edges();
				String val = l2.substr(eqpos + 1, l2.length()).strip_edges().to_lower();
				flags_found[flag] = (val == "true" || val == "1") ? true : false;
			}
		}
		memdelete(f2);
	}

	uint32_t flags = 0;

	if (flags_found.has("filter")) {
		if (flags_found["filter"])
			flags |= Texture::FLAG_FILTER;
	} else if (bool(GLOBAL_DEF("image_loader/filter", true))) {
		flags |= Texture::FLAG_FILTER;
	}

	if (flags_found.has("gen_mipmaps")) {
		if (flags_found["gen_mipmaps"])
			flags |= Texture::FLAG_MIPMAPS;
	} else if (bool(GLOBAL_DEF("image_loader/gen_mipmaps", true))) {
		flags |= Texture::FLAG_MIPMAPS;
	}

	if (flags_found.has("repeat")) {
		if (flags_found["repeat"])
			flags |= Texture::FLAG_REPEAT;
	} else if (bool(GLOBAL_DEF("image_loader/repeat", true))) {
		flags |= Texture::FLAG_REPEAT;
	}

	if (flags_found.has("anisotropic")) {
		if (flags_found["anisotropic"])
			flags |= Texture::FLAG_ANISOTROPIC_FILTER;
	}

	if (flags_found.has("tolinear")) {
		if (flags_found["tolinear"])
			flags |= Texture::FLAG_CONVERT_TO_LINEAR;
	}

	if (flags_found.has("mirroredrepeat")) {
		if (flags_found["mirroredrepeat"])
			flags |= Texture::FLAG_MIRRORED_REPEAT;
	}

	return flags;
}

bool ResourceFormatLoaderImage::handles_type(const String &p_type) const {

	return ObjectTypeDB::is_type(p_type, "Texture") || ObjectTypeDB::is_type(p_type, "CubeMap");
}

void ResourceFormatLoaderImage::get_recognized_extensions(List<String> *p_extensions) const {

	ImageLoader::get_recognized_extensions(p_extensions);
	p_extensions->push_back("cube");
}

String ResourceFormatLoaderImage::get_resource_type(const String &p_path) const {

	String ext = p_path.extension().to_lower();
	if (ext == "cube")
		return "CubeMap";

	List<String> extensions;
	ImageLoader::get_recognized_extensions(&extensions);

	for (List<String>::Element *E = extensions.front(); E; E = E->next()) {
		if (E->get() == ext)
			return "ImageTexture";
	}
	return "";
}

ResourceFormatLoaderImage::ResourceFormatLoaderImage() {

	max_texture_size = GLOBAL_DEF("debug/max_texture_size", 0);
	GLOBAL_DEF("debug/max_texture_size_alert", false);
	debug_load_times = GLOBAL_DEF("debug/image_load_times", false);
	GLOBAL_DEF("image_loader/filter", true);
	GLOBAL_DEF("image_loader/gen_mipmaps", true);
	GLOBAL_DEF("image_loader/repeat", false);
}