/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

void AudioDataConverters::convertFloatToInt16LE (const float* source, void* dest, int numSamples, const int destBytesPerSample)
{
    const double maxVal = (double) 0x7fff;
    char* intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            *(uint16*) intData = ByteOrder::swapIfBigEndian ((uint16) (short) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            *(uint16*) intData = ByteOrder::swapIfBigEndian ((uint16) (short) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
        }
    }
}

void AudioDataConverters::convertFloatToInt16BE (const float* source, void* dest, int numSamples, const int destBytesPerSample)
{
    const double maxVal = (double) 0x7fff;
    char* intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            *(uint16*) intData = ByteOrder::swapIfLittleEndian ((uint16) (short) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            *(uint16*) intData = ByteOrder::swapIfLittleEndian ((uint16) (short) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
        }
    }
}

void AudioDataConverters::convertFloatToInt24LE (const float* source, void* dest, int numSamples, const int destBytesPerSample)
{
    const double maxVal = (double) 0x7fffff;
    char* intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            ByteOrder::littleEndian24BitToChars (roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])), intData);
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            ByteOrder::littleEndian24BitToChars (roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])), intData);
        }
    }
}

void AudioDataConverters::convertFloatToInt24BE (const float* source, void* dest, int numSamples, const int destBytesPerSample)
{
    const double maxVal = (double) 0x7fffff;
    char* intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            ByteOrder::bigEndian24BitToChars (roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])), intData);
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            ByteOrder::bigEndian24BitToChars (roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])), intData);
        }
    }
}

void AudioDataConverters::convertFloatToInt32LE (const float* source, void* dest, int numSamples, const int destBytesPerSample)
{
    const double maxVal = (double) 0x7fffffff;
    char* intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            *(uint32*)intData = ByteOrder::swapIfBigEndian ((uint32) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            *(uint32*)intData = ByteOrder::swapIfBigEndian ((uint32) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
        }
    }
}

void AudioDataConverters::convertFloatToInt32BE (const float* source, void* dest, int numSamples, const int destBytesPerSample)
{
    const double maxVal = (double) 0x7fffffff;
    char* intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            *(uint32*)intData = ByteOrder::swapIfLittleEndian ((uint32) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            *(uint32*)intData = ByteOrder::swapIfLittleEndian ((uint32) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
        }
    }
}

void AudioDataConverters::convertFloatToFloat32LE (const float* source, void* dest, int numSamples, const int destBytesPerSample)
{
    jassert (dest != (void*) source || destBytesPerSample <= 4); // This op can't be performed on in-place data!

    char* d = static_cast<char*> (dest);

    for (int i = 0; i < numSamples; ++i)
    {
        *(float*) d = source[i];

       #if JUCE_BIG_ENDIAN
        *(uint32*) d = ByteOrder::swap (*(uint32*) d);
       #endif

        d += destBytesPerSample;
    }
}

void AudioDataConverters::convertFloatToFloat32BE (const float* source, void* dest, int numSamples, const int destBytesPerSample)
{
    jassert (dest != (void*) source || destBytesPerSample <= 4); // This op can't be performed on in-place data!

    char* d = static_cast<char*> (dest);

    for (int i = 0; i < numSamples; ++i)
    {
        *(float*) d = source[i];

       #if JUCE_LITTLE_ENDIAN
        *(uint32*) d = ByteOrder::swap (*(uint32*) d);
       #endif

        d += destBytesPerSample;
    }
}

//==============================================================================
void AudioDataConverters::convertInt16LEToFloat (const void* const source, float* const dest, int numSamples, const int srcBytesPerSample)
{
    const float scale = 1.0f / 0x7fff;
    const char* intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (short) ByteOrder::swapIfBigEndian (*(uint16*)intData);
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (short) ByteOrder::swapIfBigEndian (*(uint16*)intData);
        }
    }
}

void AudioDataConverters::convertInt16BEToFloat (const void* const source, float* const dest, int numSamples, const int srcBytesPerSample)
{
    const float scale = 1.0f / 0x7fff;
    const char* intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (short) ByteOrder::swapIfLittleEndian (*(uint16*)intData);
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (short) ByteOrder::swapIfLittleEndian (*(uint16*)intData);
        }
    }
}

void AudioDataConverters::convertInt24LEToFloat (const void* const source, float* const dest, int numSamples, const int srcBytesPerSample)
{
    const float scale = 1.0f / 0x7fffff;
    const char* intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (short) ByteOrder::littleEndian24Bit (intData);
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (short) ByteOrder::littleEndian24Bit (intData);
        }
    }
}

void AudioDataConverters::convertInt24BEToFloat (const void* const source, float* const dest, int numSamples, const int srcBytesPerSample)
{
    const float scale = 1.0f / 0x7fffff;
    const char* intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (short) ByteOrder::bigEndian24Bit (intData);
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (short) ByteOrder::bigEndian24Bit (intData);
        }
    }
}

void AudioDataConverters::convertInt32LEToFloat (const void* const source, float* const dest, int numSamples, const int srcBytesPerSample)
{
    const auto scale = 1.0f / (float) 0x7fffffff;
    const char* intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (int) ByteOrder::swapIfBigEndian (*(uint32*) intData);
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (int) ByteOrder::swapIfBigEndian (*(uint32*) intData);
        }
    }
}

void AudioDataConverters::convertInt32BEToFloat (const void* const source, float* const dest, int numSamples, const int srcBytesPerSample)
{
    const auto scale = 1.0f / (float) 0x7fffffff;
    const char* intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (int) ByteOrder::swapIfLittleEndian (*(uint32*) intData);
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (int) ByteOrder::swapIfLittleEndian (*(uint32*) intData);
        }
    }
}

void AudioDataConverters::convertFloat32LEToFloat (const void* const source, float* const dest, int numSamples, const int srcBytesPerSample)
{
    const char* s = static_cast<const char*> (source);

    for (int i = 0; i < numSamples; ++i)
    {
        dest[i] = *(float*)s;

       #if JUCE_BIG_ENDIAN
        uint32* const d = (uint32*) (dest + i);
        *d = ByteOrder::swap (*d);
       #endif

        s += srcBytesPerSample;
    }
}

void AudioDataConverters::convertFloat32BEToFloat (const void* const source, float* const dest, int numSamples, const int srcBytesPerSample)
{
    const char* s = static_cast<const char*> (source);

    for (int i = 0; i < numSamples; ++i)
    {
        dest[i] = *(float*)s;

       #if JUCE_LITTLE_ENDIAN
        uint32* const d = (uint32*) (dest + i);
        *d = ByteOrder::swap (*d);
       #endif

        s += srcBytesPerSample;
    }
}


//==============================================================================
void AudioDataConverters::convertFloatToFormat (const DataFormat destFormat,
                                                const float* const source,
                                                void* const dest,
                                                const int numSamples)
{
    switch (destFormat)
    {
        case int16LE:       convertFloatToInt16LE   (source, dest, numSamples); break;
        case int16BE:       convertFloatToInt16BE   (source, dest, numSamples); break;
        case int24LE:       convertFloatToInt24LE   (source, dest, numSamples); break;
        case int24BE:       convertFloatToInt24BE   (source, dest, numSamples); break;
        case int32LE:       convertFloatToInt32LE   (source, dest, numSamples); break;
        case int32BE:       convertFloatToInt32BE   (source, dest, numSamples); break;
        case float32LE:     convertFloatToFloat32LE (source, dest, numSamples); break;
        case float32BE:     convertFloatToFloat32BE (source, dest, numSamples); break;
        default:            jassertfalse; break;
    }
}

void AudioDataConverters::convertFormatToFloat (const DataFormat sourceFormat,
                                                const void* const source,
                                                float* const dest,
                                                const int numSamples)
{
    switch (sourceFormat)
    {
        case int16LE:       convertInt16LEToFloat   (source, dest, numSamples); break;
        case int16BE:       convertInt16BEToFloat   (source, dest, numSamples); break;
        case int24LE:       convertInt24LEToFloat   (source, dest, numSamples); break;
        case int24BE:       convertInt24BEToFloat   (source, dest, numSamples); break;
        case int32LE:       convertInt32LEToFloat   (source, dest, numSamples); break;
        case int32BE:       convertInt32BEToFloat   (source, dest, numSamples); break;
        case float32LE:     convertFloat32LEToFloat (source, dest, numSamples); break;
        case float32BE:     convertFloat32BEToFloat (source, dest, numSamples); break;
        default:            jassertfalse; break;
    }
}

//==============================================================================
void AudioDataConverters::interleaveSamples (const float** const source,
                                             float* const dest,
                                             const int numSamples,
                                             const int numChannels)
{
    for (int chan = 0; chan < numChannels; ++chan)
    {
        int i = chan;
        const float* src = source [chan];

        for (int j = 0; j < numSamples; ++j)
        {
            dest [i] = src [j];
            i += numChannels;
        }
    }
}

void AudioDataConverters::deinterleaveSamples (const float* const source,
                                               float** const dest,
                                               const int numSamples,
                                               const int numChannels)
{
    for (int chan = 0; chan < numChannels; ++chan)
    {
        int i = chan;
        float* dst = dest [chan];

        for (int j = 0; j < numSamples; ++j)
        {
            dst [j] = source [i];
            i += numChannels;
        }
    }
}


//==============================================================================
#if JUCE_UNIT_TESTS

class AudioConversionTests  : public UnitTest
{
public:
    AudioConversionTests() : UnitTest ("Audio data conversion", "Audio") {}

    template <class F1, class E1, class F2, class E2>
    struct Test5
    {
        static void test (UnitTest& unitTest, Random& r)
        {
            test (unitTest, false, r);
            test (unitTest, true, r);
        }

        static void test (UnitTest& unitTest, bool inPlace, Random& r)
        {
            const int numSamples = 2048;
            int32 original [numSamples], converted [numSamples], reversed [numSamples];

            {
                AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::NonConst> d (original);
                bool clippingFailed = false;

                for (int i = 0; i < numSamples / 2; ++i)
                {
                    d.setAsFloat (r.nextFloat() * 2.2f - 1.1f);

                    if (! d.isFloatingPoint())
                        clippingFailed = d.getAsFloat() > 1.0f || d.getAsFloat() < -1.0f || clippingFailed;

                    ++d;
                    d.setAsInt32 (r.nextInt());
                    ++d;
                }

                unitTest.expect (! clippingFailed);
            }

            // convert data from the source to dest format..
            std::unique_ptr<AudioData::Converter> conv (new AudioData::ConverterInstance <AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::Const>,
                                                                                          AudioData::Pointer<F2, E2, AudioData::NonInterleaved, AudioData::NonConst>>());
            conv->convertSamples (inPlace ? reversed : converted, original, numSamples);

            // ..and back again..
            conv.reset (new AudioData::ConverterInstance <AudioData::Pointer<F2, E2, AudioData::NonInterleaved, AudioData::Const>,
                                                          AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::NonConst>>());
            if (! inPlace)
                zeromem (reversed, sizeof (reversed));

            conv->convertSamples (reversed, inPlace ? reversed : converted, numSamples);

            {
                int biggestDiff = 0;
                AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::Const> d1 (original);
                AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::Const> d2 (reversed);

                const int errorMargin = 2 * AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::Const>::get32BitResolution()
                                          + AudioData::Pointer<F2, E2, AudioData::NonInterleaved, AudioData::Const>::get32BitResolution();

                for (int i = 0; i < numSamples; ++i)
                {
                    biggestDiff = jmax (biggestDiff, std::abs (d1.getAsInt32() - d2.getAsInt32()));
                    ++d1;
                    ++d2;
                }

                unitTest.expect (biggestDiff <= errorMargin);
            }
        }
    };

    template <class F1, class E1, class FormatType>
    struct Test3
    {
        static void test (UnitTest& unitTest, Random& r)
        {
            Test5 <F1, E1, FormatType, AudioData::BigEndian>::test (unitTest, r);
            Test5 <F1, E1, FormatType, AudioData::LittleEndian>::test (unitTest, r);
        }
    };

    template <class FormatType, class Endianness>
    struct Test2
    {
        static void test (UnitTest& unitTest, Random& r)
        {
            Test3 <FormatType, Endianness, AudioData::Int8>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::UInt8>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::Int16>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::Int24>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::Int32>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::Float32>::test (unitTest, r);
        }
    };

    template <class FormatType>
    struct Test1
    {
        static void test (UnitTest& unitTest, Random& r)
        {
            Test2 <FormatType, AudioData::BigEndian>::test (unitTest, r);
            Test2 <FormatType, AudioData::LittleEndian>::test (unitTest, r);
        }
    };

    void runTest() override
    {
        Random r = getRandom();
        beginTest ("Round-trip conversion: Int8");
        Test1 <AudioData::Int8>::test (*this, r);
        beginTest ("Round-trip conversion: Int16");
        Test1 <AudioData::Int16>::test (*this, r);
        beginTest ("Round-trip conversion: Int24");
        Test1 <AudioData::Int24>::test (*this, r);
        beginTest ("Round-trip conversion: Int32");
        Test1 <AudioData::Int32>::test (*this, r);
        beginTest ("Round-trip conversion: Float32");
        Test1 <AudioData::Float32>::test (*this, r);
    }
};

static AudioConversionTests audioConversionUnitTests;

#endif

} // namespace juce