/**
	This file is a part of r0nk, atlas_moon, and rexy's matrix client
	Copyright (C) 2019 rexy712

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero 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 Affero General Public License for more details.

	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef MATRIX_IMAGE_THUMBNAIL_MAKER_HPP
#define MATRIX_IMAGE_THUMBNAIL_MAKER_HPP

#include <FreeImagePlus.h>
#include <vector>
#include <cstdlib> //size_t
#include "matrix/upload_info.hpp"

#define THUMBSIZE 500

namespace matrix::internal{

	static std::vector<char> _create_image_thumbnail(fipImage& image, FREE_IMAGE_FORMAT type, size_t target_size){
		image.makeThumbnail(target_size);
		FreeImageIO fileout;
		std::vector<char> buffer;
		fileout.write_proc = [](void* ptr, unsigned int size, unsigned int nmemb, void* fp) -> unsigned int{
			std::vector<char>& buffer = *reinterpret_cast<std::vector<char>*>(fp);
			buffer.insert(buffer.end(), (char*)ptr, ((char*)ptr)+size*nmemb);
			return size*nmemb;
		};
		switch(type){
		case FIF_JPEG:
			return image.saveToHandle(type, &fileout, &buffer, JPEG_QUALITYGOOD | JPEG_SUBSAMPLING_411) ? buffer : std::vector<char>();
		case FIF_PNG:
			return image.saveToHandle(type, &fileout, &buffer, PNG_Z_BEST_COMPRESSION) ? buffer : std::vector<char>();
		default:
			return image.saveToHandle(type, &fileout, &buffer) ? buffer : std::vector<char>();
		};
	}
	static std::vector<char> _load_image_thumbnail_info(fipImage& image, image_info& info, FREE_IMAGE_FORMAT type){
		//create and upload thumbnail
		if(info.width >  THUMB_SIZE || info.height > THUMB_SIZE){
			std::vector<char> thumb_data = _create_image_thumbnail(image, type, THUMB_SIZE);
			if(!thumb_data.size()){
				info.thumb_width = info.width;
				info.thumb_height = info.height;
				info.thumbsize = info.filesize;
			}else{
				info.thumb_width = image.getWidth();
				info.thumb_height = image.getHeight();
				info.thumbsize = thumb_data.size();
				return thumb_data;
			}
		}else{
			info.thumb_width = info.width;
			info.thumb_height = info.height;
			info.thumbsize = info.filesize;
		}
		return {};
	}

}

#endif