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

   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-9-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::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 juce::dsp
