/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "third_party/blink/renderer/modules/webaudio/audio_buffer.h"

#include <memory>

#include "base/compiler_specific.h"
#include "base/containers/span.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_audio_buffer_options.h"
#include "third_party/blink/renderer/modules/webaudio/base_audio_context.h"
#include "third_party/blink/renderer/platform/audio/audio_bus.h"
#include "third_party/blink/renderer/platform/audio/audio_utilities.h"
#include "third_party/blink/renderer/platform/bindings/exception_messages.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"

namespace blink {

AudioBuffer* AudioBuffer::Create(unsigned number_of_channels,
                                 uint32_t number_of_frames,
                                 float sample_rate) {
  if (!audio_utilities::IsValidAudioBufferSampleRate(sample_rate) ||
      number_of_channels > BaseAudioContext::MaxNumberOfChannels() ||
      !number_of_channels || !number_of_frames) {
    return nullptr;
  }

  AudioBuffer* buffer = MakeGarbageCollected<AudioBuffer>(
      number_of_channels, number_of_frames, sample_rate);

  if (!buffer->CreatedSuccessfully(number_of_channels)) {
    return nullptr;
  }
  return buffer;
}

AudioBuffer* AudioBuffer::Create(unsigned number_of_channels,
                                 uint32_t number_of_frames,
                                 float sample_rate,
                                 ExceptionState& exception_state) {
  if (!number_of_channels ||
      number_of_channels > BaseAudioContext::MaxNumberOfChannels()) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kNotSupportedError,
        ExceptionMessages::IndexOutsideRange(
            "number of channels", number_of_channels, 1u,
            ExceptionMessages::kInclusiveBound,
            BaseAudioContext::MaxNumberOfChannels(),
            ExceptionMessages::kInclusiveBound));
    return nullptr;
  }

  if (!audio_utilities::IsValidAudioBufferSampleRate(sample_rate)) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kNotSupportedError,
        ExceptionMessages::IndexOutsideRange(
            "sample rate", sample_rate,
            audio_utilities::MinAudioBufferSampleRate(),
            ExceptionMessages::kInclusiveBound,
            audio_utilities::MaxAudioBufferSampleRate(),
            ExceptionMessages::kInclusiveBound));
    return nullptr;
  }

  if (!number_of_frames) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kNotSupportedError,
        ExceptionMessages::IndexExceedsMinimumBound("number of frames",
                                                    number_of_frames, 0u));
    return nullptr;
  }

  AudioBuffer* audio_buffer =
      Create(number_of_channels, number_of_frames, sample_rate);

  if (!audio_buffer) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kNotSupportedError,
        "createBuffer(" + String::Number(number_of_channels) + ", " +
            String::Number(number_of_frames) + ", " +
            String::Number(sample_rate) + ") failed.");
  }

  return audio_buffer;
}

AudioBuffer* AudioBuffer::Create(const AudioBufferOptions* options,
                                 ExceptionState& exception_state) {
  return Create(options->numberOfChannels(), options->length(),
                options->sampleRate(), exception_state);
}

AudioBuffer* AudioBuffer::CreateUninitialized(unsigned number_of_channels,
                                              uint32_t number_of_frames,
                                              float sample_rate) {
  if (!audio_utilities::IsValidAudioBufferSampleRate(sample_rate) ||
      number_of_channels > BaseAudioContext::MaxNumberOfChannels() ||
      !number_of_channels || !number_of_frames) {
    return nullptr;
  }

  AudioBuffer* buffer = MakeGarbageCollected<AudioBuffer>(
      number_of_channels, number_of_frames, sample_rate,
      InitializationPolicy::kDontInitialize);

  if (!buffer->CreatedSuccessfully(number_of_channels)) {
    return nullptr;
  }
  return buffer;
}

AudioBuffer* AudioBuffer::CreateFromAudioBus(AudioBus* bus) {
  if (!bus) {
    return nullptr;
  }
  AudioBuffer* buffer = MakeGarbageCollected<AudioBuffer>(bus);
  if (buffer->CreatedSuccessfully(bus->NumberOfChannels())) {
    return buffer;
  }
  return nullptr;
}

bool AudioBuffer::CreatedSuccessfully(
    unsigned desired_number_of_channels) const {
  return numberOfChannels() == desired_number_of_channels;
}

DOMFloat32Array* AudioBuffer::CreateFloat32ArrayOrNull(
    uint32_t length,
    InitializationPolicy policy) {
  return policy == InitializationPolicy::kZeroInitialize
             ? DOMFloat32Array::CreateOrNull(length)
             : DOMFloat32Array::CreateUninitializedOrNull(length);
}

AudioBuffer::AudioBuffer(unsigned number_of_channels,
                         uint32_t number_of_frames,
                         float sample_rate,
                         InitializationPolicy policy)
    : sample_rate_(sample_rate), length_(number_of_frames) {
  channels_.reserve(number_of_channels);

  for (unsigned i = 0; i < number_of_channels; ++i) {
    DOMFloat32Array* channel_data_array =
        CreateFloat32ArrayOrNull(length_, policy);
    // If the channel data array could not be created, just return. The caller
    // will need to check that the desired number of channels were created.
    if (!channel_data_array) {
      return;
    }

    channels_.push_back(channel_data_array);
  }
}

AudioBuffer::AudioBuffer(AudioBus* bus)
    : sample_rate_(bus->SampleRate()), length_(bus->length()) {
  // Copy audio data from the bus to the Float32Arrays we manage.
  unsigned number_of_channels = bus->NumberOfChannels();
  channels_.reserve(number_of_channels);
  for (unsigned i = 0; i < number_of_channels; ++i) {
    DOMFloat32Array* channel_data_array = CreateFloat32ArrayOrNull(
        length_, InitializationPolicy::kDontInitialize);
    // If the channel data array could not be created, just return. The caller
    // will need to check that the desired number of channels were created.
    if (!channel_data_array) {
      return;
    }

    const float* src = bus->Channel(i)->Data();
    float* dst = channel_data_array->Data();
    UNSAFE_TODO(memmove(dst, src, length_ * sizeof(*dst)));
    channels_.push_back(channel_data_array);
  }
}

NotShared<DOMFloat32Array> AudioBuffer::getChannelData(
    unsigned channel_index,
    ExceptionState& exception_state) {
  if (channel_index >= channels_.size()) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kIndexSizeError,
        "channel index (" + String::Number(channel_index) +
            ") exceeds number of channels (" +
            String::Number(channels_.size()) + ")");
    return NotShared<DOMFloat32Array>(nullptr);
  }

  return getChannelData(channel_index);
}

NotShared<DOMFloat32Array> AudioBuffer::getChannelData(unsigned channel_index) {
  if (channel_index >= channels_.size()) {
    return NotShared<DOMFloat32Array>(nullptr);
  }

  return NotShared<DOMFloat32Array>(channels_[channel_index].Get());
}

void AudioBuffer::copyFromChannel(NotShared<DOMFloat32Array> destination,
                                  int32_t channel_number,
                                  ExceptionState& exception_state) {
  return copyFromChannel(destination, channel_number, 0, exception_state);
}

void AudioBuffer::copyFromChannel(NotShared<DOMFloat32Array> destination,
                                  int32_t channel_number,
                                  size_t buffer_offset,
                                  ExceptionState& exception_state) {
  if (channel_number < 0 ||
      static_cast<uint32_t>(channel_number) >= channels_.size()) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kIndexSizeError,
        ExceptionMessages::IndexOutsideRange(
            "channelNumber", channel_number, 0,
            ExceptionMessages::kInclusiveBound,
            static_cast<int32_t>(channels_.size() - 1),
            ExceptionMessages::kInclusiveBound));

    return;
  }

  base::span<const float> src = channels_[channel_number].Get()->AsSpan();
  base::span<float> dst = destination->AsSpan();

  // We don't need to copy anything if a) the buffer offset is past the end of
  // the AudioBuffer or b) the internal `Data()` of is a zero-length
  // `Float32Array`, which can result a nullptr.
  if (buffer_offset >= src.size() || dst.size() <= 0) {
    return;
  }

  size_t count = std::min(dst.size(), src.size() - buffer_offset);

  DCHECK(src.data());
  DCHECK(dst.data());

  dst.first(count).copy_from(src.subspan(buffer_offset, count));
}

void AudioBuffer::copyToChannel(NotShared<DOMFloat32Array> source,
                                int32_t channel_number,
                                ExceptionState& exception_state) {
  return copyToChannel(source, channel_number, 0, exception_state);
}

void AudioBuffer::copyToChannel(NotShared<DOMFloat32Array> source,
                                int32_t channel_number,
                                size_t buffer_offset,
                                ExceptionState& exception_state) {
  if (channel_number < 0 ||
      static_cast<uint32_t>(channel_number) >= channels_.size()) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kIndexSizeError,
        ExceptionMessages::IndexOutsideRange(
            "channelNumber", channel_number, 0,
            ExceptionMessages::kInclusiveBound,
            static_cast<int32_t>(channels_.size() - 1),
            ExceptionMessages::kInclusiveBound));
    return;
  }

  base::span<float> dst = channels_[channel_number].Get()->AsSpan();

  if (buffer_offset >= dst.size()) {
    // Nothing to copy if the buffer offset is past the end of the AudioBuffer.
    return;
  }

  size_t count = dst.size() - buffer_offset;

  base::span<const float> src = source->AsSpan();
  count = std::min(src.size(), count);

  DCHECK(src.data());
  DCHECK(dst.data());

  dst.subspan(buffer_offset, count).copy_from(src.first(count));
}

void AudioBuffer::Zero() {
  for (unsigned i = 0; i < channels_.size(); ++i) {
    if (NotShared<DOMFloat32Array> array = getChannelData(i)) {
      float* data = array->Data();
      UNSAFE_TODO(memset(data, 0, length() * sizeof(*data)));
    }
  }
}

std::unique_ptr<SharedAudioBuffer> AudioBuffer::CreateSharedAudioBuffer() {
  return std::make_unique<SharedAudioBuffer>(this);
}

SharedAudioBuffer::SharedAudioBuffer(AudioBuffer* buffer)
    : sample_rate_(buffer->sampleRate()), length_(buffer->length()) {
  channels_.resize(buffer->numberOfChannels());
  for (unsigned int i = 0; i < buffer->numberOfChannels(); ++i) {
    buffer->getChannelData(i)->buffer()->ShareNonSharedForInternalUse(
        channels_[i]);
  }
}

void SharedAudioBuffer::Zero() {
  for (auto& channel : channels_) {
    float* data = static_cast<float*>(channel.Data());
    UNSAFE_TODO(memset(data, 0, length() * sizeof(*data)));
  }
}

}  // namespace blink