/*
    Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>

    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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/** @file  test/image_test.cc
 *  @brief Tests of the Image class.
 *
 *  @see test/make_black_test.cc, test/pixel_formats_test.cc
 */

#include <boost/test/unit_test.hpp>
#include <Magick++.h>
#include "lib/image.h"

using std::string;
using std::list;
using std::cout;
using boost::shared_ptr;

BOOST_AUTO_TEST_CASE (aligned_image_test)
{
	Image* s = new Image (PIX_FMT_RGB24, dcp::Size (50, 50), true);
	BOOST_CHECK_EQUAL (s->components(), 1);
	/* 160 is 150 aligned to the nearest 32 bytes */
	BOOST_CHECK_EQUAL (s->stride()[0], 160);
	BOOST_CHECK_EQUAL (s->line_size()[0], 150);
	BOOST_CHECK (s->data()[0]);
	BOOST_CHECK (!s->data()[1]);
	BOOST_CHECK (!s->data()[2]);
	BOOST_CHECK (!s->data()[3]);

	/* copy constructor */
	Image* t = new Image (*s);
	BOOST_CHECK_EQUAL (t->components(), 1);
	BOOST_CHECK_EQUAL (t->stride()[0], 160);
	BOOST_CHECK_EQUAL (t->line_size()[0], 150);
	BOOST_CHECK (t->data()[0]);
	BOOST_CHECK (!t->data()[1]);
	BOOST_CHECK (!t->data()[2]);
	BOOST_CHECK (!t->data()[3]);
	BOOST_CHECK (t->data() != s->data());
	BOOST_CHECK (t->data()[0] != s->data()[0]);
	BOOST_CHECK (t->line_size() != s->line_size());
	BOOST_CHECK_EQUAL (t->line_size()[0], s->line_size()[0]);
	BOOST_CHECK (t->stride() != s->stride());
	BOOST_CHECK_EQUAL (t->stride()[0], s->stride()[0]);

	/* assignment operator */
	Image* u = new Image (PIX_FMT_YUV422P, dcp::Size (150, 150), false);
	*u = *s;
	BOOST_CHECK_EQUAL (u->components(), 1);
	BOOST_CHECK_EQUAL (u->stride()[0], 160);
	BOOST_CHECK_EQUAL (u->line_size()[0], 150);
	BOOST_CHECK (u->data()[0]);
	BOOST_CHECK (!u->data()[1]);
	BOOST_CHECK (!u->data()[2]);
	BOOST_CHECK (!u->data()[3]);
	BOOST_CHECK (u->data() != s->data());
	BOOST_CHECK (u->data()[0] != s->data()[0]);
	BOOST_CHECK (u->line_size() != s->line_size());
	BOOST_CHECK_EQUAL (u->line_size()[0], s->line_size()[0]);
	BOOST_CHECK (u->stride() != s->stride());
	BOOST_CHECK_EQUAL (u->stride()[0], s->stride()[0]);

	delete s;
	delete t;
	delete u;
}

BOOST_AUTO_TEST_CASE (compact_image_test)
{
	Image* s = new Image (PIX_FMT_RGB24, dcp::Size (50, 50), false);
	BOOST_CHECK_EQUAL (s->components(), 1);
	BOOST_CHECK_EQUAL (s->stride()[0], 50 * 3);
	BOOST_CHECK_EQUAL (s->line_size()[0], 50 * 3);
	BOOST_CHECK (s->data()[0]);
	BOOST_CHECK (!s->data()[1]);
	BOOST_CHECK (!s->data()[2]);
	BOOST_CHECK (!s->data()[3]);

	/* copy constructor */
	Image* t = new Image (*s);
	BOOST_CHECK_EQUAL (t->components(), 1);
	BOOST_CHECK_EQUAL (t->stride()[0], 50 * 3);
	BOOST_CHECK_EQUAL (t->line_size()[0], 50 * 3);
	BOOST_CHECK (t->data()[0]);
	BOOST_CHECK (!t->data()[1]);
	BOOST_CHECK (!t->data()[2]);
	BOOST_CHECK (!t->data()[3]);
	BOOST_CHECK (t->data() != s->data());
	BOOST_CHECK (t->data()[0] != s->data()[0]);
	BOOST_CHECK (t->line_size() != s->line_size());
	BOOST_CHECK_EQUAL (t->line_size()[0], s->line_size()[0]);
	BOOST_CHECK (t->stride() != s->stride());
	BOOST_CHECK_EQUAL (t->stride()[0], s->stride()[0]);

	/* assignment operator */
	Image* u = new Image (PIX_FMT_YUV422P, dcp::Size (150, 150), true);
	*u = *s;
	BOOST_CHECK_EQUAL (u->components(), 1);
	BOOST_CHECK_EQUAL (u->stride()[0], 50 * 3);
	BOOST_CHECK_EQUAL (u->line_size()[0], 50 * 3);
	BOOST_CHECK (u->data()[0]);
	BOOST_CHECK (!u->data()[1]);
	BOOST_CHECK (!u->data()[2]);
	BOOST_CHECK (!u->data()[3]);
	BOOST_CHECK (u->data() != s->data());
	BOOST_CHECK (u->data()[0] != s->data()[0]);
	BOOST_CHECK (u->line_size() != s->line_size());
	BOOST_CHECK_EQUAL (u->line_size()[0], s->line_size()[0]);
	BOOST_CHECK (u->stride() != s->stride());
	BOOST_CHECK_EQUAL (u->stride()[0], s->stride()[0]);

	delete s;
	delete t;
	delete u;
}

BOOST_AUTO_TEST_CASE (crop_image_test)
{
	/* This was to check out a bug with valgrind, and is probably not very useful */
	shared_ptr<Image> image (new Image (PIX_FMT_YUV420P, dcp::Size (16, 16), true));
	image->make_black ();
	Crop crop;
	crop.top = 3;
	image->crop (crop, false);
}

/* Test cropping of a YUV 4:2:0 image by 1 pixel, which used to fail because
   the U/V copying was not rounded up to the next sample.
*/
BOOST_AUTO_TEST_CASE (crop_image_test2)
{
	/* Here's a 1998 x 1080 image which is black */
	shared_ptr<Image> image (new Image (PIX_FMT_YUV420P, dcp::Size (1998, 1080), true));
	image->make_black ();

	/* Crop it by 1 pixel */
	Crop crop;
	crop.left = 1;
	image = image->crop (crop, true);

	/* Convert it back to RGB to make comparison to black easier */
	image = image->scale (image->size(), dcp::YUV_TO_RGB_REC601, PIX_FMT_RGB24, true);

	/* Check that its still black after the crop */
	uint8_t* p = image->data()[0];
	for (int y = 0; y < image->size().height; ++y) {
		uint8_t* q = p;
		for (int x = 0; x < image->size().width; ++x) {
			BOOST_CHECK_EQUAL (*q++, 0);
			BOOST_CHECK_EQUAL (*q++, 0);
			BOOST_CHECK_EQUAL (*q++, 0);
		}
		p += image->stride()[0];
	}
}

static
void
crop_scale_window_single (AVPixelFormat in_format, dcp::Size in_size, Crop crop, dcp::Size inter_size, dcp::Size out_size)
{
	/* Set up our test image */
	shared_ptr<Image> test (new Image (in_format, in_size, true));
	uint8_t n = 0;
	for (int c = 0; c < test->components(); ++c) {
		uint8_t* p = test->data()[c];
		for (int y = 0; y < test->lines(c); ++y) {
			for (int x = 0; x < test->stride()[c]; ++x) {
				*p++ = n++;
			}
		}
	}
				
	/* Convert using separate methods */
	boost::shared_ptr<Image> sep = test->crop (crop, true);
	sep = sep->scale (inter_size, dcp::YUV_TO_RGB_REC601, PIX_FMT_RGB24, true);
	boost::shared_ptr<Image> sep_container (new Image (PIX_FMT_RGB24, out_size, true));
	sep_container->make_black ();
	sep_container->copy (sep, Position<int> ((out_size.width - inter_size.width) / 2, (out_size.height - inter_size.height) / 2));

	/* Convert using the all-in-one method */
	shared_ptr<Image> all = test->crop_scale_window (crop, inter_size, out_size, dcp::YUV_TO_RGB_REC601, PIX_FMT_RGB24, true);

	/* Compare */
	BOOST_CHECK_EQUAL (sep_container->size().width, all->size().width);
	BOOST_CHECK_EQUAL (sep_container->size().height, all->size().height);

	/* Assuming RGB on these */
	BOOST_CHECK_EQUAL (sep_container->components(), 1);
	BOOST_CHECK_EQUAL (all->components(), 1);

	uint8_t* p = sep_container->data()[0];
	uint8_t* q = all->data()[0];
	for (int y = 0; y < all->size().height; ++y) {
		uint8_t* pp = p;
		uint8_t* qq = q;
		for (int x = 0; x < all->size().width * 3; ++x) {
			BOOST_CHECK_EQUAL (*pp++, *qq++);
		}
		p += sep_container->stride()[0];
		q += all->stride()[0];
	}
}

/** Test Image::crop_scale_window against separate calls to crop/scale/copy */
BOOST_AUTO_TEST_CASE (crop_scale_window_test)
{
	crop_scale_window_single (AV_PIX_FMT_YUV422P, dcp::Size (640, 480), Crop (), dcp::Size (640, 480), dcp::Size (640, 480));
	crop_scale_window_single (AV_PIX_FMT_YUV422P, dcp::Size (640, 480), Crop (2, 4, 6, 8), dcp::Size (640, 480), dcp::Size (640, 480));
	crop_scale_window_single (AV_PIX_FMT_YUV422P, dcp::Size (640, 480), Crop (2, 4, 6, 8), dcp::Size (1920, 1080), dcp::Size (1998, 1080));
	crop_scale_window_single (AV_PIX_FMT_YUV422P, dcp::Size (640, 480), Crop (1, 4, 6, 8), dcp::Size (1920, 1080), dcp::Size (1998, 1080));
	crop_scale_window_single (AV_PIX_FMT_YUV420P, dcp::Size (640, 480), Crop (16, 16, 0, 0), dcp::Size (1920, 1080), dcp::Size (1998, 1080));
	crop_scale_window_single (AV_PIX_FMT_YUV420P, dcp::Size (640, 480), Crop (16, 3, 3, 0), dcp::Size (1920, 1080), dcp::Size (1998, 1080));
	crop_scale_window_single (AV_PIX_FMT_RGB24, dcp::Size (1000, 800), Crop (0, 0, 0, 0), dcp::Size (1920, 1080), dcp::Size (1998, 1080));
	crop_scale_window_single (AV_PIX_FMT_RGB24, dcp::Size (1000, 800), Crop (55, 0, 1, 9), dcp::Size (1920, 1080), dcp::Size (1998, 1080));
}

/** Test Image::alpha_blend */
BOOST_AUTO_TEST_CASE (alpha_blend_test)
{
	int const stride = 48 * 4;
	
	shared_ptr<Image> A (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 48), false));
	A->make_black ();
	uint8_t* a = A->data()[0];

	for (int y = 0; y < 48; ++y) {
		uint8_t* p = a + y * stride;
		for (int x = 0; x < 16; ++x) {
			p[x * 4] = 255;
			p[(x + 16) * 4 + 1] = 255;
			p[(x + 32) * 4 + 2] = 255;
		}
	}

	shared_ptr<Image> B (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 48), true));
	B->make_transparent ();
	uint8_t* b = B->data()[0];

	for (int y = 32; y < 48; ++y) {
		uint8_t* p = b + y * stride;
		for (int x = 0; x < 48; ++x) {
			p[x * 4] = 255;
			p[x * 4 + 1] = 255;
			p[x * 4 + 2] = 255;
			p[x * 4 + 3] = 255;
		}
	}

	A->alpha_blend (B, Position<int> (0, 0));

	for (int y = 0; y < 32; ++y) {
		uint8_t* p = a + y * stride;
		for (int x = 0; x < 16; ++x) {
			BOOST_CHECK_EQUAL (p[x * 4], 255);
			BOOST_CHECK_EQUAL (p[(x + 16) * 4 + 1], 255);
			BOOST_CHECK_EQUAL (p[(x + 32) * 4 + 2], 255);
		}
	}

	for (int y = 32; y < 48; ++y) {
		uint8_t* p = a + y * stride;
		for (int x = 0; x < 48; ++x) {
			BOOST_CHECK_EQUAL (p[x * 4], 255);
			BOOST_CHECK_EQUAL (p[x * 4 + 1], 255);
			BOOST_CHECK_EQUAL (p[x * 4 + 2], 255);
			BOOST_CHECK_EQUAL (p[x * 4 + 3], 255);
		}
	}
}

/** Test merge (list<PositionImage>) with a single image */
BOOST_AUTO_TEST_CASE (merge_test1)
{
	int const stride = 48 * 4;
	
	shared_ptr<Image> A (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 48), false));
	A->make_transparent ();
	uint8_t* a = A->data()[0];

	for (int y = 0; y < 48; ++y) {
		uint8_t* p = a + y * stride;
		for (int x = 0; x < 16; ++x) {
			/* red */
			p[x * 4] = 255;
			/* opaque */
			p[x * 4 + 3] = 255;
		}
	}

	list<PositionImage> all;
	all.push_back (PositionImage (A, Position<int> (0, 0)));
	PositionImage merged = merge (all);

	BOOST_CHECK (merged.position == Position<int> (0, 0));
	BOOST_CHECK_EQUAL (memcmp (merged.image->data()[0], A->data()[0], stride * 48), 0);
}

/** Test merge (list<PositionImage>) with two images */
BOOST_AUTO_TEST_CASE (merge_test2)
{
	shared_ptr<Image> A (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 1), false));
	A->make_transparent ();
	uint8_t* a = A->data()[0];
	for (int x = 0; x < 16; ++x) {
		/* red */
		a[x * 4] = 255;
		/* opaque */
		a[x * 4 + 3] = 255;
	}

	shared_ptr<Image> B (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 1), false));
	B->make_transparent ();
	uint8_t* b = B->data()[0];
	for (int x = 0; x < 16; ++x) {
		/* blue */
		b[(x + 32) * 4 + 2] = 255;
		/* opaque */
		b[(x + 32) * 4 + 3] = 255;
	}

	list<PositionImage> all;
	all.push_back (PositionImage (A, Position<int> (0, 0)));
	all.push_back (PositionImage (B, Position<int> (0, 0)));
	PositionImage merged = merge (all);

	BOOST_CHECK (merged.position == Position<int> (0, 0));

	uint8_t* m = merged.image->data()[0];

	for (int x = 0; x < 16; ++x) {
		BOOST_CHECK_EQUAL (m[x * 4], 255);
		BOOST_CHECK_EQUAL (m[x * 4 + 3], 255);
		BOOST_CHECK_EQUAL (m[(x + 16) * 4 + 3], 0);
		BOOST_CHECK_EQUAL (m[(x + 32) * 4 + 2], 255);
		BOOST_CHECK_EQUAL (m[(x + 32) * 4 + 3], 255);
	}
}