/*
Author: Christian Bailer
Contact address: Christian.Bailer@dfki.de
Department Augmented Vision DFKI

License Agreement
For Open Source Computer Vision Library
(3-clause BSD License)

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
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* Neither the names of the copyright holders nor the names of the contributors
may be used to endorse or promote products derived from this software
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This software is provided by the copyright holders and contributors "as is" and
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*/

#ifndef RECTTOOLS_HPP
#define RECTTOOLS_HPP

#include <math.h>
#include <opencv2/opencv.hpp>
#include "debug.hpp"
#include <opencv2/imgproc/imgproc_c.h>

namespace eco
{
template <typename t>
inline cv::Vec<t, 2> center(const cv::Rect_<t> &rect)
{
	return cv::Vec<t, 2>(rect.x + rect.width / (t)2.0f, rect.y + rect.height / (t)2.0f);
}

template <typename t>
inline t x2(const cv::Rect_<t> &rect)
{
	return rect.x + rect.width;
}

template <typename t>
inline t y2(const cv::Rect_<t> &rect)
{
	return rect.y + rect.height;
}

template <typename t>
inline void resize(cv::Rect_<t> &rect, float scalex, float scaley = 0)
{
	if (!scaley)
	{
		scaley = scalex;
	}
	rect.x -= rect.width * (scalex - 1.0f) / 2.0f;
	rect.width *= scalex;

	rect.y -= rect.height * (scaley - 1.0f) / 2.0f;
	rect.height *= scaley;
}

template <typename t>
inline void limit(cv::Rect_<t> &rect, cv::Rect_<t> limit)
{
	if (rect.x + rect.width > limit.x + limit.width)
	{
		rect.width = limit.x + limit.width - rect.x;
	}
	if (rect.y + rect.height > limit.y + limit.height)
	{
		rect.height = limit.y + limit.height - rect.y;
	}
	if (rect.x < limit.x)
	{
		rect.width -= (limit.x - rect.x);
		rect.x = limit.x;
	}
	if (rect.y < limit.y)
	{
		rect.height -= (limit.y - rect.y);
		rect.y = limit.y;
	}
	if (rect.width < 0)
	{
		rect.width = 0;
	}
	if (rect.height < 0)
	{
		rect.height = 0;
	}
}

template <typename t>
inline void limit(cv::Rect_<t> &rect, t width, t height, t x = 0, t y = 0)
{
	limit(rect, cv::Rect_<t>(x, y, width, height));
}

template <typename t>
inline cv::Rect getBorder(const cv::Rect_<t> &original, cv::Rect_<t> &limited)
{
	cv::Rect_<t> res;
	res.x = limited.x - original.x;
	res.y = limited.y - original.y;
	res.width = x2(original) - x2(limited);
	res.height = y2(original) - y2(limited);
	assert(res.x >= 0 && res.y >= 0 && res.width >= 0 && res.height >= 0);
	return res;
}
// cut "window" out from "input".
inline cv::Mat subwindow(const cv::Mat &input, const cv::Rect &window, int borderType = cv::BORDER_CONSTANT)
{
	cv::Mat res;
	cv::Rect cutWindow = window;
	limit(cutWindow, input.cols, input.rows);
	//debug("cutWindow: %d x %d", cutWindow.height, cutWindow.width);
	if (cutWindow.height <= 0 || cutWindow.width <= 0)
	{
		//assert(0 && "error: cutWindow size error!\n");
		return res;//cv::Mat(window.height,window.width,input.type(),0) ;
	}
	cv::Rect border = getBorder(window, cutWindow);
	res = input(cutWindow);
	if (border != cv::Rect(0, 0, 0, 0))
	{
		cv::copyMakeBorder(res, res, border.y, border.height, border.x, border.width, borderType);
	}
	return res;
}

inline cv::Mat getGrayImage(cv::Mat img)
{
	cv::cvtColor(img, img, CV_BGR2GRAY);
	img.convertTo(img, CV_32F, 1 / 255.f);
	return img;
}

} // namespace eco

#endif