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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   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
{
namespace dsp
{

/**
    Processor wrapper around juce::Reverb for easy integration into ProcessorChain.

    @tags{DSP}
*/
class Reverb
{
public:
    //==============================================================================
    /** Creates an uninitialised Reverb processor. Call prepare() before first use. */
    Reverb() = default;

    //==============================================================================
    using Parameters = juce::Reverb::Parameters;

    /** Returns the reverb's current parameters. */
    const Parameters& getParameters() const noexcept    { return reverb.getParameters(); }

    /** Applies a new set of parameters to the reverb.
        Note that this doesn't attempt to lock the reverb, so if you call this in parallel with
        the process method, you may get artifacts.
    */
    void setParameters (const Parameters& newParams)    { reverb.setParameters (newParams); }

    /** Returns true if the reverb is enabled. */
    bool isEnabled() const noexcept                     { return enabled; }

    /** Enables/disables the reverb. */
    void setEnabled (bool newValue) noexcept            { enabled = newValue; }

    //==============================================================================
    /** Initialises the reverb. */
    void prepare (const ProcessSpec& spec)
    {
        reverb.setSampleRate (spec.sampleRate);
    }

    /** Resets the reverb's internal state. */
    void reset() noexcept
    {
        reverb.reset();
    }

    //==============================================================================
    /** Applies the reverb to a mono or stereo buffer. */
    template <typename ProcessContext>
    void process (const ProcessContext& context) noexcept
    {
        const auto& inputBlock = context.getInputBlock();
        auto& outputBlock = context.getOutputBlock();
        const auto numInChannels = inputBlock.getNumChannels();
        const auto numOutChannels = outputBlock.getNumChannels();
        const auto numSamples = outputBlock.getNumSamples();

        jassert (inputBlock.getNumSamples() == numSamples);

        outputBlock.copyFrom (inputBlock);

        if (! enabled || context.isBypassed)
            return;

        if (numInChannels == 1 && numOutChannels == 1)
        {
            reverb.processMono (outputBlock.getChannelPointer (0), (int) numSamples);
        }
        else if (numInChannels == 2 && numOutChannels == 2)
        {
            reverb.processStereo (outputBlock.getChannelPointer (0),
                                  outputBlock.getChannelPointer (1),
                                  (int) numSamples);
        }
        else
        {
            jassertfalse;   // invalid channel configuration
        }
    }

private:
    //==============================================================================
    juce::Reverb reverb;
    bool enabled = true;
};

} // namespace dsp
} // namespace juce