///////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2014 Industrial Light & Magic, a division of Lucas

// Digital Ltd. LLC

// 

// All rights reserved.

// 

// 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, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// *       Neither the name of Industrial Light & Magic nor the names of

// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission. 

// 

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

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///////////////////////////////////////////////////////////////////////////

#include <ImfFlatImage.h>

#include <ImfFlatImageIO.h>

#include <ImfHeader.h>

#include <ImathRandom.h>

#include <Iex.h>

#include <cstdio>

#include <cassert>

using namespace OPENEXR_IMF_NAMESPACE;

using namespace IMATH_NAMESPACE;

using namespace IEX_NAMESPACE;

using namespace std;

namespace {

template <class T>

void

verifyPixelsAreEqual

    (const FlatImageChannel &c1,

     const FlatImageChannel &c2,

     int dx,

     int dy)

{

    const TypedFlatImageChannel<T> &tc1 =

        dynamic_cast <const TypedFlatImageChannel<T>&> (c1);

    const TypedFlatImageChannel<T> &tc2 =

        dynamic_cast <const TypedFlatImageChannel<T>&> (c2);

    const Box2i &dataWindow = c1.level().dataWindow();

    int xStep = c1.xSampling();

    int yStep = c1.ySampling();

    for (int y = dataWindow.min.y; y <= dataWindow.max.y; y += yStep)

        for (int x = dataWindow.min.x; x <= dataWindow.max.x; x += xStep)

            if (tc1.at (x, y) != tc2.at (x + dx, y + dy))

                throw ArgExc ("different pixel values");

}

void

verifyLevelsAreEqual

    (const FlatImageLevel &level1,

     const FlatImageLevel &level2,

     int dx,

     int dy)

{

    if (level1.dataWindow().min.x != level2.dataWindow().min.x - dx ||

        level1.dataWindow().min.y != level2.dataWindow().min.y - dy ||

        level1.dataWindow().max.x != level2.dataWindow().max.x - dx ||

        level1.dataWindow().max.y != level2.dataWindow().max.y - dy)

    {

        throw ArgExc ("different data windows");

    }

    FlatImageLevel::ConstIterator i1 = level1.begin();

    FlatImageLevel::ConstIterator i2 = level2.begin();

    while (i1 != level1.end() && i2 != level2.end())

    {

        cout << "            channel " << i1.name() << endl;

        if (i1.name() != i2.name())

            throw ArgExc ("different channel names");

        if (i1.channel().pixelType() != i2.channel().pixelType())

            throw ArgExc ("different channel types");

        if (i1.channel().xSampling() != i2.channel().xSampling() ||

            i1.channel().ySampling() != i2.channel().ySampling())

            throw ArgExc ("different channel sampling rates");

        if (i1.channel().pLinear() != i2.channel().pLinear())

            throw ArgExc ("different channel types");

        switch (i1.channel().pixelType())

        {

          case HALF:

            verifyPixelsAreEqual <half>

                (i1.channel(), i2.channel(), dx, dy);

            break;

          case FLOAT:

            verifyPixelsAreEqual <float>

                (i1.channel(), i2.channel(), dx, dy);

            break;

          case UINT:

            verifyPixelsAreEqual <unsigned int>

                (i1.channel(), i2.channel(), dx, dy);

            break;

          default:

             assert (false);

        }

        ++i1;

        ++i2;

    }

    if (i1 != level1.end() || i2 != level2.end())

        throw ArgExc ("different channel lists");

}

void

verifyImagesAreEqual

    (const FlatImage &img1,

     const FlatImage &img2,

     int dx = 0,

     int dy = 0)

{

    if (img1.levelMode() != img2.levelMode())

        throw ArgExc ("different level modes");

    if (img1.levelRoundingMode() != img2.levelRoundingMode())

        throw ArgExc ("different level rounding modes");

    if (img1.numXLevels() != img2.numXLevels() ||

        img1.numYLevels() != img2.numYLevels())

        throw ArgExc ("different number of levels");

    switch (img1.levelMode())

    {

      case ONE_LEVEL:

        cout << "        level 0" << endl;

        verifyLevelsAreEqual

            (img1.level(), img2.level(), dx, dy);

        break;

      case MIPMAP_LEVELS:

        for (int x = 0; x < img1.numLevels(); ++x)

        {

            cout << "        level " << x << "" << endl;

            verifyLevelsAreEqual

                (img1.level (x), img2.level (x), dx, dy);

        }

        break;

      case RIPMAP_LEVELS:

        for (int y = 0; y < img1.numYLevels(); ++y)

        {

            for (int x = 0; x < img1.numXLevels(); ++x)

            {

                cout << "        level (" << x << ", " << y << ")" << endl;

                verifyLevelsAreEqual

                    (img1.level (x, y), img2.level (x, y), dx, dy);

            }

        }

        break;

      default:

        assert (false);

    }

}

template <class T>

void

fillChannel (Rand48 &random, FlatImageChannel &c)

{

    //

    // Fill image channel tc with random numbers

    //

    TypedFlatImageChannel<T> &tc =

        dynamic_cast <TypedFlatImageChannel<T>&> (c);

    const Box2i &dataWindow = tc.level().dataWindow();

    int xStep = tc.xSampling();

    int yStep = tc.ySampling();

    for (int y = dataWindow.min.y; y <= dataWindow.max.y; y += yStep)

        for (int x = dataWindow.min.x; x <= dataWindow.max.x; x += xStep)

            tc.at (x, y) = T (random.nextf (0.0, 100.0));

}

void

fillChannels (Rand48 &random, FlatImageLevel &level)

{

    for (FlatImageLevel::Iterator i = level.begin(); i != level.end(); ++i)

    {

        cout << "             channel " << i.name() << endl;

        switch (i.channel().pixelType())

        {

          case HALF:

            fillChannel <half> (random, i.channel());

            break;

          case FLOAT:

            fillChannel <float> (random, i.channel());

            break;

          case UINT:

            fillChannel <unsigned int> (random, i.channel());

            break;

          default:

             assert (false);

        }

    }

}

void

fillChannels (Rand48 &random, FlatImage &img)

{

    switch (img.levelMode())

    {

      case ONE_LEVEL:

        cout << "        level 0" << endl;

        fillChannels (random, img.level());

        break;

      case MIPMAP_LEVELS:

        for (int x = 0; x < img.numLevels(); ++x)

        {

            cout << "        level " << x << "" << endl;

            fillChannels (random, img.level (x));

        }

        break;

      case RIPMAP_LEVELS:

        for (int y = 0; y < img.numYLevels(); ++y)

        {

            for (int x = 0; x < img.numXLevels(); ++x)

            {

                cout << "        level (" << x << ", " << y << ")" << endl;

                fillChannels (random, img.level (x, y));

            }

        }

        break;

      default:

        assert (false);

    }

}

void

testScanLineImage

    (const Box2i &dataWindow,

     const string &fileName)

{

    cout << "scan lines, data window = "

            "(" << dataWindow.min.x << ", " << dataWindow.min.y << ") - "

            "(" << dataWindow.max.x << ", " << dataWindow.max.y << ")" << endl;

    FlatImage img1;

    img1.resize (dataWindow);

    img1.insertChannel ("H11", HALF, 1, 1, false);

    img1.insertChannel ("H22", HALF, 2, 2, true);

    img1.insertChannel ("H12", HALF, 1, 2, true);

    img1.insertChannel ("H21", HALF, 2, 1, true);

    img1.insertChannel ("F", FLOAT, 1, 1, false);

    img1.insertChannel ("UI", UINT, 1, 1, false);

    Rand48 random (0);

    cout << "    generating random pixel values" << endl;

    fillChannels (random, img1);

    cout << "    saving file" << endl;

    saveFlatScanLineImage (fileName, img1);

    FlatImage img2;

    cout << "    loading file" << endl;

    loadFlatImage (fileName, img2);

    cout << "    comparing" << endl;

    verifyImagesAreEqual (img1, img2);

    remove (fileName.c_str());

}

void

testScanLineImages (const string &fileName)

{

    testScanLineImage (Box2i (V2i (0, 0), V2i (399, 499)), fileName);

    testScanLineImage (Box2i (V2i (-10, -50), V2i (499, 599)), fileName);

    testScanLineImage (Box2i (V2i (50, 10), V2i (699, 199)), fileName);

}

void

testTiledImage

    (const Box2i &dataWindow,

     const string &fileName,

     LevelMode levelMode,

     LevelRoundingMode levelRoundingMode)

{

    cout << "tiles, data window = "

            "(" << dataWindow.min.x << ", " << dataWindow.min.y << ") - "

            "(" << dataWindow.max.x << ", " << dataWindow.max.y << "), "

            "level mode = " << levelMode << ", "

            "rounding mode = " << levelRoundingMode << endl;

    FlatImage img1;

    img1.resize (dataWindow, levelMode, levelRoundingMode);

    img1.insertChannel ("H1", HALF, 1, 1, false);

    img1.insertChannel ("H2", HALF, 1, 1, true);

    img1.insertChannel ("F", FLOAT, 1, 1, false);

    img1.insertChannel ("UI", UINT, 1, 1, false);

    Rand48 random (0);

    cout << "    generating random pixel values" << endl;

    fillChannels (random, img1);

    cout << "    saving file" << endl;

    saveFlatTiledImage (fileName, img1);

    FlatImage img2;

    cout << "    loading file" << endl;

    loadFlatImage (fileName, img2);

    cout << "    comparing" << endl;

    verifyImagesAreEqual (img1, img2);

    remove (fileName.c_str());

}

void

testTiledImage

    (const Box2i &dataWindow,

     const string &fileName)

{

    testTiledImage (dataWindow, fileName, ONE_LEVEL, ROUND_DOWN);

    testTiledImage (dataWindow, fileName, MIPMAP_LEVELS, ROUND_DOWN);

    testTiledImage (dataWindow, fileName, MIPMAP_LEVELS, ROUND_UP);

    testTiledImage (dataWindow, fileName, RIPMAP_LEVELS, ROUND_DOWN);

    testTiledImage (dataWindow, fileName, RIPMAP_LEVELS, ROUND_UP);

}

void

testTiledImages (const string &fileName)

{

    testTiledImage (Box2i (V2i (0, 0), V2i (399, 499)), fileName);

    testTiledImage (Box2i (V2i (-10, -50), V2i (499, 599)), fileName);

    testTiledImage (Box2i (V2i (50, 10), V2i (699, 199)), fileName);

}

void

testShiftPixels ()

{

    cout << "pixel shifting" << endl;

    FlatImage img1 (Box2i (V2i (15, 20), V2i (45, 60)), MIPMAP_LEVELS);

    img1.insertChannel ("A", HALF);

    img1.insertChannel ("B", HALF);

    FlatImage img2 (Box2i (V2i (15, 20), V2i (45, 60)), MIPMAP_LEVELS);

    img2.insertChannel ("A", HALF);

    img2.insertChannel ("B", HALF);

    cout << "    generating random pixel values" << endl;

    {

        Rand48 random (1);

        fillChannels (random, img1);

    }

    {

        Rand48 random (1);

        fillChannels (random, img2);

    }

    int DX = 5;

    int DY = 7;

    cout << "    shifting, dx = " << DX << ", dy = " << DY << endl;

    img2.shiftPixels (DX, DY);

    cout << "    comparing" << endl;

    verifyImagesAreEqual (img1, img2, DX, DY);

}

void

testCropping (const string &fileName)

{

    cout << "cropping an image" << endl;

    FlatImage img1 (Box2i (V2i (10, 20), V2i (110, 120)), ONE_LEVEL);

    img1.insertChannel ("A", HALF);

    Rand48 random (0);

    cout << "    generating random pixel values" << endl;

    fillChannels (random, img1);

    Header hdr;

    hdr.dataWindow() = Box2i (V2i (40, 50), V2i (60, 70));

    cout << "    saving scan line file" << endl;

    saveFlatScanLineImage (fileName, hdr, img1, USE_HEADER_DATA_WINDOW);

    cout << "    loading file" << endl;

    FlatImage img2;

    loadFlatImage (fileName, img2);

    assert (img2.dataWindow() != img1.dataWindow());

    assert (img2.dataWindow() == hdr.dataWindow());

    cout << "    comparing" << endl;

    verifyPixelsAreEqual <half> (img2.level().channel ("A"),

                                 img1.level().channel ("A"),

                                 0, 0);

    cout << "    saving tiled file" << endl;

    saveFlatTiledImage (fileName, hdr, img1, USE_HEADER_DATA_WINDOW);

    cout << "    loading file" << endl;

    FlatImage img3;

    loadFlatImage (fileName, img3);

    assert (img3.dataWindow() != img1.dataWindow());

    assert (img3.dataWindow() == hdr.dataWindow());

    cout << "    comparing" << endl;

    verifyPixelsAreEqual <half> (img3.level(0).channel ("A"),

                                 img1.level(0).channel ("A"),

                                 0, 0);

}

void

testRenameChannel ()

{

    cout << "renaming a single channel" << endl;

    FlatImage img (Box2i (V2i (15, 20), V2i (45, 60)), MIPMAP_LEVELS);

    img.insertChannel ("A", HALF);

    img.insertChannel ("B", HALF);

    for (int i = 0; i < img.numLevels(); ++i)

    {

        const FlatImageLevel &level = img.level (i);

        assert (level.findTypedChannel <half> ("A") != 0);

        assert (level.findTypedChannel <half> ("B") != 0);

        assert (level.findTypedChannel <half> ("C") == 0);

    }

    img.renameChannel ("A", "C");

    for (int i = 0; i < img.numLevels(); ++i)

    {

        const FlatImageLevel &level = img.level (i);

        assert (level.findTypedChannel <half> ("A") == 0);

        assert (level.findTypedChannel <half> ("B") != 0);

        assert (level.findTypedChannel <half> ("C") != 0);

    }

    try

    {

        img.renameChannel ("A", "D");   // "A" doesn't exist

        assert (false);

    }

    catch (...)

    {

        // expecting exception

    }

    try

    {

        img.renameChannel ("C", "B");   // "B" exists already

        assert (false);

    }

    catch (...)

    {

        // expecting exception

    }

}

void

testRenameChannels ()

{

    cout << "renaming multiple channels at the same time" << endl;

    FlatImage img (Box2i (V2i (0, 0), V2i (10, 10)), MIPMAP_LEVELS);

    img.insertChannel ("A", HALF);

    img.insertChannel ("B", HALF);

    img.insertChannel ("C", HALF);

    img.insertChannel ("D", HALF);

    img.level(0).typedChannel<half>("A").at (0, 0) = 1;

    img.level(0).typedChannel<half>("B").at (0, 0) = 2;

    img.level(0).typedChannel<half>("C").at (0, 0) = 3;

    img.level(0).typedChannel<half>("D").at (0, 0) = 4;

    img.level(1).typedChannel<half>("A").at (0, 0) = 1;

    img.level(1).typedChannel<half>("B").at (0, 0) = 2;

    img.level(1).typedChannel<half>("C").at (0, 0) = 3;

    img.level(1).typedChannel<half>("D").at (0, 0) = 4;

    {

        RenamingMap oldToNewNames;

        oldToNewNames["A"] = "B";

        oldToNewNames["B"] = "A";

        oldToNewNames["C"] = "E";

        oldToNewNames["X"] = "Y";

        img.renameChannels (oldToNewNames);

    }

    assert (img.level(0).findChannel("A") != 0);

    assert (img.level(0).findChannel("B") != 0);

    assert (img.level(0).findChannel("C") == 0);

    assert (img.level(0).findChannel("D") != 0);

    assert (img.level(0).findChannel("E") != 0);

    assert (img.level(0).typedChannel<half>("A").at (0, 0) == 2);

    assert (img.level(0).typedChannel<half>("B").at (0, 0) == 1);

    assert (img.level(0).typedChannel<half>("D").at (0, 0) == 4);

    assert (img.level(0).typedChannel<half>("E").at (0, 0) == 3);

    assert (img.level(1).typedChannel<half>("A").at (0, 0) == 2);

    assert (img.level(1).typedChannel<half>("B").at (0, 0) == 1);

    assert (img.level(1).typedChannel<half>("D").at (0, 0) == 4);

    assert (img.level(1).typedChannel<half>("E").at (0, 0) == 3);

    try

    {

        RenamingMap oldToNewNames;

        oldToNewNames["A"] = "F";

        oldToNewNames["B"] = "F";   // duplicate new name "F"

        img.renameChannels (oldToNewNames);

        assert (false);

    }

    catch (...)

    {

        // expecting exception

    }

    try

    {

        RenamingMap oldToNewNames;

        oldToNewNames["A"] = "B";   // duplicate new name "B"

        img.renameChannels (oldToNewNames);

        assert (false);

    }

    catch (...)

    {

        // expecting exception

    }

}

} // namespace

void

testFlatImage (const string &tempDir)

{

    try

    {

	cout << "Testing class FlatImage" << endl;

        testScanLineImages (tempDir + "scanLines.exr");

        testTiledImages (tempDir + "tiles.exr");

        testShiftPixels();

        testCropping (tempDir + "cropped.exr");

        testRenameChannel();

        testRenameChannels();

	cout << "ok\n" << endl;

    }

    catch (const std::exception &e)

    {

	cerr << "ERROR -- caught exception: " << e.what() << endl;

	assert (false);

    }

}