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//
// Copyright (c) 2004-2012, Industrial Light & Magic, a division of Lucasfilm
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#include <ImfTiledRgbaFile.h>
#include <ImfArray.h>
#include <ImfThreading.h>
#include "IlmThread.h"
#include <stdio.h>
#include <assert.h>
#include <math.h>


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


namespace {

void
waves (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 = (0.5 + 0.5 * sin (0.1 * x + 0.1 * y)) +
		  (0.5 + 0.5 * sin (-0.1 * x + 0.2 * y));

	    p.g = p.r;
	    p.b = p.r;

	    p.a = (0.5 + 0.5 * sin (1.1 * x + 0.5 * y));
	}
    }
}


void
wheel (Array2D<Rgba> &pixels, int w, int h)
{
    float n = 40;
    float m = 0.5;
    float radMin = 2 * n / M_PI;
    float xCen = w * 0.5;
    float yCen = h * 0.5;
    float radMax = (xCen < yCen)? xCen: yCen;

    for (int y = 0; y < h; ++y)
    {
	for (int x = 0; x < w; ++x)
	{
	    Rgba &p = pixels[y][x];
	    float rad = sqrt ((x-xCen) * (x-xCen) + (y-yCen) * (y-yCen));

	    if (rad <= radMax && rad >= radMin)
	    {
		float phi = atan2 (y - yCen, x - xCen);
		float c = 0.5 + 0.5 * sin (phi * n + rad * m);

		p.r = 0.5 + 0.5 * c;
		p.g = p.r;
		p.b = p.r;
		p.a = 0.5 - 0.5 * c;
	    }
	    else
	    {
		p.r = 0.5;
		p.g = p.r;
		p.b = p.r;
		p.a = p.r;
	    }
	}
    }
}


void
writeReadYa (Box2i &dw,
	     int tileSizeX,
	     int tileSizeY,
	     const char fileName[],
	     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);

    fillPixels (pixels1, w, h);

    cout << "writing " << flush;

    {
	TiledRgbaOutputFile out (fileName,
				 tileSizeX, tileSizeY,
				 ONE_LEVEL, ROUND_DOWN,
				 dw, dw,
				 WRITE_YA);

	out.setFrameBuffer (&pixels1[-dw.min.y][-dw.min.x], 1, w);
        out.writeTiles (0, out.numXTiles() - 1,  0, out.numYTiles() - 1);
    }

    cout << "reading " << flush;

    {
	TiledRgbaInputFile in (fileName);

	in.setFrameBuffer (&pixels2[-dw.min.y][-dw.min.x], 1, w);
        in.readTiles (0, in.numXTiles() - 1, 0, in.numYTiles() - 1);
    }

    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];

	    assert (p1.r == p2.r);
	    assert (p1.g == p2.g);
	    assert (p1.b == p2.b);
	    assert (p1.a == p2.a);
	}
    }

    remove (fileName);
}

} // namespace


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

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

	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;
	    }

	    Box2i dataWindow (V2i (-17, -29), V2i (348, 556));
	    writeReadYa (dataWindow, 19, 27, fileName.c_str(), waves);
	    writeReadYa (dataWindow, 19, 27, fileName.c_str(), wheel);
	}

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