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#include <ImfRgbaFile.h>
#include <ImfArray.h>
#include <ImfThreading.h>
#include "IlmThread.h"
#include "ImathMath.h"
#include <stdio.h>
#include <assert.h>
#include <algorithm>


using namespace OPENEXR_IMF_NAMESPACE;
using namespace std;
using namespace IMATH_NAMESPACE;

namespace {

void
fillPixelsColor (Array2D <Rgba> &pixels, int w, int h)
{
    for (int y = 0; y < h; ++y)
    {
	for (int x = 0; x < w; ++x)
	{
	    Rgba &p = pixels[y][x];

	    p.r = 0.8 + 0.5 * sin (x * 0.05);
	    p.g = 0.8 + 0.5 * sin (x * 0.02 + y * 0.02);
	    p.b = 0.8 + 0.5 * sin (y * 0.03);

	    float t = 0.8 + 0.5 * sin (x * 0.05 - y * 0.05);

	    p.r *= t;
	    p.g *= t;
	    p.b *= t;
	    p.a  = t;
	}
    }
}


void
fillPixelsGray (Array2D <Rgba> &pixels, int w, int h)
{
    for (int y = 0; y < h; ++y)
    {
	for (int x = 0; x < w; ++x)
	{
	    Rgba &p = pixels[y][x];

	    p.r = 0.8 + 0.5 * sin (x * 0.05 - y * 0.05);
	    p.g = p.r;
	    p.b = p.r;
	    p.a = 0.5 + 0.5 * cos (x * 0.05 - y * 0.05);
	}
    }
}


void
writeReadYca (const char fileName[],
	      const Box2i &dw,
	      RgbaChannels channels,
	      LineOrder writeOrder,
	      LineOrder readOrder,
	      void (* fillPixels) (Array2D <Rgba> &pixels, int w, int h))
{
    int w = dw.max.x - dw.min.x + 1;
    int h = dw.max.y - dw.min.y + 1;
    Array2D <Rgba> pixels1 (h, w);
    Array2D <Rgba> pixels2 (h, w);

    cout << w << " by " << h << " pixels, "
	    "channels " << channels << ", "
	    "write order " << writeOrder << ", "
	    "read order " << readOrder <<
	    endl;

    fillPixels (pixels1, w, h);

    cout << "writing " << flush;

    {
	RgbaOutputFile out (fileName,
			    dw, dw,	// display window, data window
			    channels,
			    1,		// pixelAspectRatio
			    V2f (0, 0),	// screenWindowCenter
			    1,		// screenWindowWidth
			    writeOrder);

	out.setYCRounding (9, 9);
	out.setFrameBuffer (&pixels1[-dw.min.y][-dw.min.x], 1, w);
	out.writePixels (h);
    }

    cout << "reading " << flush;

    {
	RgbaInputFile in (fileName);

	in.setFrameBuffer (&pixels2[-dw.min.y][-dw.min.x], 1, w);

	switch (readOrder)
	{
	  case INCREASING_Y:

	    for (int y = dw.min.y; y <= dw.max.y; ++y)
		in.readPixels (y);

	    break;

	  case DECREASING_Y:

	    for (int y = dw.max.y; y >= dw.min.y; --y)
		in.readPixels (y);

	    break;

	  case RANDOM_Y:

	    assert (h % 5 != 0);

	    for (int i = 0; i < h; ++i)
	    {
		int y = dw.min.y + (i * 5) % h;
		in.readPixels (y);
	    }

	    break;
	}
    }

    cout << "comparing" << endl;

    for (int y = 0; y < h; ++y)
    {
	for (int x = 0; x < w; ++x)
	{
	    const Rgba &p1 = pixels1[y][x];
	    const Rgba &p2 = pixels2[y][x];

	    if (channels & WRITE_C)
	    {
		float p1Max = max (p1.r, max (p1.g, p1.b));
		float p2Max = max (p2.r, max (p2.g, p2.b));

		assert (equalWithAbsError (p1Max, p2Max, 0.03f));
	    }
	    else
	    {
		assert (p1.g == p2.g);
	    }

	    if (channels & WRITE_A)
	    {
		assert (p1.a == p2.a);
	    }
	}
    }

    remove (fileName);
}

} // namespace


void
testYca (const std::string &tempDir)
{
    try
    {
        cout << "Testing luminance/chroma input and output" << endl;

	std::string fileName = tempDir + "imf_test_yca.exr";

	Box2i dataWindow[6];
	dataWindow[0] = Box2i (V2i (0, 0), V2i (1, 17));
	dataWindow[1] = Box2i (V2i (0, 0), V2i (5, 17));
	dataWindow[2] = Box2i (V2i (0, 0), V2i (17, 1));
	dataWindow[3] = Box2i (V2i (0, 0), V2i (17, 5));
	dataWindow[4] = Box2i (V2i (0, 0), V2i (1, 1));
	dataWindow[5] = Box2i (V2i (-18, -28), V2i (247, 255));

	int maxThreads = ILMTHREAD_NAMESPACE::supportsThreads()? 3: 0;

	for (int n = 0; n <= maxThreads; ++n)
	{
	    if (ILMTHREAD_NAMESPACE::supportsThreads())
	    {
		setGlobalThreadCount (n);
		cout << "\nnumber of threads: " << globalThreadCount() << endl;
	    }

	    for (int i = 0; i < 6; ++i)
	    {
		for (int writeOrder = INCREASING_Y;
		     writeOrder <= DECREASING_Y;
		     ++writeOrder)
		{
		    for (int readOrder = INCREASING_Y;
			 readOrder <= RANDOM_Y;
			 ++readOrder)
		    {
			writeReadYca (fileName.c_str(), dataWindow[i],
				      WRITE_YCA,
				      LineOrder (writeOrder),
				      LineOrder (readOrder),
				      fillPixelsColor);

			writeReadYca (fileName.c_str(), dataWindow[i],
				      WRITE_YC,
				      LineOrder (writeOrder),
				      LineOrder (readOrder),
				      fillPixelsColor);

			writeReadYca (fileName.c_str(), dataWindow[i],
				      WRITE_YA,
				      LineOrder (writeOrder),
				      LineOrder (readOrder),
				      fillPixelsGray);

			writeReadYca (fileName.c_str(), dataWindow[i],
				      WRITE_Y,
				      LineOrder (writeOrder),
				      LineOrder (readOrder),
				      fillPixelsGray);
		    }
		}
	    }
	}

	cout << "ok\n" << endl;
    }
    catch (const std::exception &e)
    {
	cerr << "ERROR -- caught exception: " << e.what() << endl;
	assert (false);
    }
}