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

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

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

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

namespace juce
{

namespace WindowsMediaCodec
{

class JuceIStream final : public ComBaseClassHelper<IStream>
{
public:
    JuceIStream (InputStream& in) noexcept
        : source (in)
    {
    }

    JUCE_COMRESULT Commit (DWORD)                                        override { return S_OK; }
    JUCE_COMRESULT Write (const void*, ULONG, ULONG*)                    override { return E_NOTIMPL; }
    JUCE_COMRESULT Clone (IStream**)                                     override { return E_NOTIMPL; }
    JUCE_COMRESULT SetSize (ULARGE_INTEGER)                              override { return E_NOTIMPL; }
    JUCE_COMRESULT Revert()                                              override { return E_NOTIMPL; }
    JUCE_COMRESULT LockRegion (ULARGE_INTEGER, ULARGE_INTEGER, DWORD)    override { return E_NOTIMPL; }
    JUCE_COMRESULT UnlockRegion (ULARGE_INTEGER, ULARGE_INTEGER, DWORD)  override { return E_NOTIMPL; }

    JUCE_COMRESULT Read (void* dest, ULONG numBytes, ULONG* bytesRead) override
    {
        auto numRead = source.read (dest, (size_t) numBytes);

        if (bytesRead != nullptr)
            *bytesRead = (ULONG) numRead;

        return (numRead == (int) numBytes) ? S_OK : S_FALSE;
    }

    JUCE_COMRESULT Seek (LARGE_INTEGER position, DWORD origin, ULARGE_INTEGER* resultPosition) override
    {
        auto newPos = (int64) position.QuadPart;

        if (origin == STREAM_SEEK_CUR)
        {
            newPos += source.getPosition();
        }
        else if (origin == STREAM_SEEK_END)
        {
            auto len = source.getTotalLength();

            if (len < 0)
                return E_NOTIMPL;

            newPos += len;
        }

        if (resultPosition != nullptr)
            resultPosition->QuadPart = (ULONGLONG) newPos;

        return source.setPosition (newPos) ? S_OK : E_NOTIMPL;
    }

    JUCE_COMRESULT CopyTo (IStream* destStream, ULARGE_INTEGER numBytesToDo,
                           ULARGE_INTEGER* bytesRead, ULARGE_INTEGER* bytesWritten) override
    {
        uint64 totalCopied = 0;
        auto numBytes = (int64) numBytesToDo.QuadPart;

        while (numBytes > 0 && ! source.isExhausted())
        {
            char buffer [1024];

            auto numToCopy = (int) jmin ((int64) sizeof (buffer), (int64) numBytes);
            auto numRead = source.read (buffer, numToCopy);

            if (numRead <= 0)
                break;

            destStream->Write (buffer, (ULONG) numRead, nullptr);
            totalCopied += (ULONG) numRead;
        }

        if (bytesRead != nullptr)      bytesRead->QuadPart = totalCopied;
        if (bytesWritten != nullptr)   bytesWritten->QuadPart = totalCopied;

        return S_OK;
    }

    JUCE_COMRESULT Stat (STATSTG* stat, DWORD) override
    {
        if (stat == nullptr)
            return STG_E_INVALIDPOINTER;

        zerostruct (*stat);
        stat->type = STGTY_STREAM;
        stat->cbSize.QuadPart = (ULONGLONG) jmax ((int64) 0, source.getTotalLength());
        return S_OK;
    }

private:
    InputStream& source;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (JuceIStream)
};

//==============================================================================
static const char* wmFormatName = "Windows Media";
static const char* const extensions[] = { ".mp3", ".wmv", ".asf", ".wm", ".wma", nullptr };

//==============================================================================
class WMAudioReader final : public AudioFormatReader
{
public:
    WMAudioReader (InputStream* const input_)
        : AudioFormatReader (input_, TRANS (wmFormatName)),
          wmvCoreLib ("Wmvcore.dll")
    {
        JUCE_LOAD_WINAPI_FUNCTION (wmvCoreLib, WMCreateSyncReader, wmCreateSyncReader,
                                   HRESULT, (IUnknown*, DWORD, IWMSyncReader**))

        if (wmCreateSyncReader != nullptr)
        {
            checkCoInitialiseCalled();

            HRESULT hr = wmCreateSyncReader (nullptr, WMT_RIGHT_PLAYBACK, wmSyncReader.resetAndGetPointerAddress());

            if (SUCCEEDED (hr))
                hr = wmSyncReader->OpenStream (becomeComSmartPtrOwner (new JuceIStream (*input)));

            if (SUCCEEDED (hr))
            {
                WORD streamNum = 1;
                hr = wmSyncReader->GetStreamNumberForOutput (0, &streamNum);
                hr = wmSyncReader->SetReadStreamSamples (streamNum, false);

                scanFileForDetails();
            }
        }
    }

    ~WMAudioReader() override
    {
        if (wmSyncReader != nullptr)
            wmSyncReader->Close();
    }

    bool readSamples (int* const* destSamples, int numDestChannels, int startOffsetInDestBuffer,
                      int64 startSampleInFile, int numSamples) override
    {
        if (sampleRate <= 0)
            return false;

        checkCoInitialiseCalled();

        clearSamplesBeyondAvailableLength (destSamples, numDestChannels, startOffsetInDestBuffer,
                                           startSampleInFile, numSamples, lengthInSamples);

        const auto stride = (int) (numChannels * sizeof (int16));

        while (numSamples > 0)
        {
            if (! bufferedRange.contains (startSampleInFile))
            {
                const bool hasJumped = (startSampleInFile != bufferedRange.getEnd());

                if (hasJumped)
                    wmSyncReader->SetRange ((QWORD) (startSampleInFile * 10000000 / (int64) sampleRate), 0);

                ComSmartPtr<INSSBuffer> sampleBuffer;
                QWORD sampleTime, duration;
                DWORD flags, outputNum;
                WORD streamNum;

                HRESULT hr = wmSyncReader->GetNextSample (1, sampleBuffer.resetAndGetPointerAddress(),
                                                          &sampleTime, &duration, &flags, &outputNum, &streamNum);

                if (sampleBuffer != nullptr)
                {
                    BYTE* rawData = nullptr;
                    DWORD dataLength = 0;
                    hr = sampleBuffer->GetBufferAndLength (&rawData, &dataLength);

                    if (dataLength == 0)
                        return false;

                    if (hasJumped)
                        bufferedRange.setStart ((int64) ((sampleTime * (QWORD) sampleRate) / 10000000));
                    else
                        bufferedRange.setStart (bufferedRange.getEnd()); // (because the positions returned often aren't contiguous)

                    bufferedRange.setLength ((int64) dataLength / (int64) stride);

                    buffer.ensureSize ((size_t) dataLength);
                    memcpy (buffer.getData(), rawData, (size_t) dataLength);
                }
                else if (hr == NS_E_NO_MORE_SAMPLES)
                {
                    bufferedRange.setStart (startSampleInFile);
                    bufferedRange.setLength (256);
                    buffer.ensureSize (256 * (size_t) stride);
                    buffer.fillWith (0);
                }
                else
                {
                    return false;
                }
            }

            auto offsetInBuffer = (int) (startSampleInFile - bufferedRange.getStart());
            auto* rawData = static_cast<const int16*> (addBytesToPointer (buffer.getData(), offsetInBuffer * stride));
            auto numToDo = jmin (numSamples, (int) (bufferedRange.getLength() - offsetInBuffer));

            for (int i = 0; i < numDestChannels; ++i)
            {
                JUCE_BEGIN_IGNORE_WARNINGS_MSVC (28182)
                jassert (destSamples[i] != nullptr);

                auto srcChan = jmin (i, (int) numChannels - 1);
                const int16* src = rawData + srcChan;
                int* const dst = destSamples[i] + startOffsetInDestBuffer;

                for (int j = 0; j < numToDo; ++j)
                {
                    dst[j] = (int) (((uint32) *src) << 16);
                    src += numChannels;
                }
                JUCE_END_IGNORE_WARNINGS_MSVC
            }

            startSampleInFile += numToDo;
            startOffsetInDestBuffer += numToDo;
            numSamples -= numToDo;
        }

        return true;
    }

private:
    DynamicLibrary wmvCoreLib;
    ComSmartPtr<IWMSyncReader> wmSyncReader;
    MemoryBlock buffer;
    Range<int64> bufferedRange;

    void checkCoInitialiseCalled()
    {
        [[maybe_unused]] const auto result = CoInitialize (nullptr);
    }

    void scanFileForDetails()
    {
        if (auto wmHeaderInfo = wmSyncReader.getInterface<IWMHeaderInfo>())
        {
            QWORD lengthInNanoseconds = 0;
            WORD lengthOfLength = sizeof (lengthInNanoseconds);
            WORD streamNum = 0;
            WMT_ATTR_DATATYPE wmAttrDataType;
            wmHeaderInfo->GetAttributeByName (&streamNum, L"Duration", &wmAttrDataType,
                                              (BYTE*) &lengthInNanoseconds, &lengthOfLength);

            if (auto wmProfile = wmSyncReader.getInterface<IWMProfile>())
            {
                ComSmartPtr<IWMStreamConfig> wmStreamConfig;
                auto hr = wmProfile->GetStream (0, wmStreamConfig.resetAndGetPointerAddress());

                if (SUCCEEDED (hr))
                {
                    if (auto wmMediaProperties = wmStreamConfig.getInterface<IWMMediaProps>())
                    {
                        DWORD sizeMediaType;
                        hr = wmMediaProperties->GetMediaType (nullptr, &sizeMediaType);

                        HeapBlock<WM_MEDIA_TYPE> mediaType;
                        mediaType.malloc (sizeMediaType, 1);
                        hr = wmMediaProperties->GetMediaType (mediaType, &sizeMediaType);

                        if (mediaType->majortype == WMMEDIATYPE_Audio)
                        {
                            auto* inputFormat = reinterpret_cast<WAVEFORMATEX*> (mediaType->pbFormat);

                            sampleRate = inputFormat->nSamplesPerSec;
                            numChannels = inputFormat->nChannels;
                            bitsPerSample = inputFormat->wBitsPerSample != 0 ? inputFormat->wBitsPerSample : 16;
                            lengthInSamples = (lengthInNanoseconds * (QWORD) sampleRate) / 10000000;
                        }
                    }
                }
            }
        }
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WMAudioReader)
};

}

//==============================================================================
WindowsMediaAudioFormat::WindowsMediaAudioFormat()
    : AudioFormat (TRANS (WindowsMediaCodec::wmFormatName),
                   StringArray (WindowsMediaCodec::extensions))
{
}

WindowsMediaAudioFormat::~WindowsMediaAudioFormat() = default;

Array<int> WindowsMediaAudioFormat::getPossibleSampleRates()    { return {}; }
Array<int> WindowsMediaAudioFormat::getPossibleBitDepths()      { return {}; }

bool WindowsMediaAudioFormat::canDoStereo()     { return true; }
bool WindowsMediaAudioFormat::canDoMono()       { return true; }
bool WindowsMediaAudioFormat::isCompressed()    { return true; }

//==============================================================================
AudioFormatReader* WindowsMediaAudioFormat::createReaderFor (InputStream* sourceStream, bool deleteStreamIfOpeningFails)
{
    std::unique_ptr<WindowsMediaCodec::WMAudioReader> r (new WindowsMediaCodec::WMAudioReader (sourceStream));

    if (r->sampleRate > 0)
        return r.release();

    if (! deleteStreamIfOpeningFails)
        r->input = nullptr;

    return nullptr;
}

AudioFormatWriter* WindowsMediaAudioFormat::createWriterFor (OutputStream* /*streamToWriteTo*/, double /*sampleRateToUse*/,
                                                             unsigned int /*numberOfChannels*/, int /*bitsPerSample*/,
                                                             const StringPairArray& /*metadataValues*/, int /*qualityOptionIndex*/)
{
    jassertfalse; // not yet implemented!
    return nullptr;
}

} // namespace juce
