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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   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
{

class ProcessorChainTest : public UnitTest
{
    template <int AddValue>
    struct MockProcessor
    {
        void prepare (const ProcessSpec&) noexcept { isPrepared = true; }
        void reset() noexcept { isReset = true; }

        template <typename Context>
        void process (const Context& context) noexcept
        {
            bufferWasClear = context.getInputBlock().getSample (0, 0) == 0;

            if (! context.isBypassed)
                context.getOutputBlock().add (AddValue);
        }

        bool isPrepared     = false;
        bool isReset        = false;
        bool bufferWasClear = false;
    };

public:
    ProcessorChainTest()
        : UnitTest ("ProcessorChain", UnitTestCategories::dsp) {}

    void runTest() override
    {
        beginTest ("After calling setBypass, processor is bypassed");
        {
            ProcessorChain<MockProcessor<1>, MockProcessor<2>> chain;

            setBypassed<0> (chain, true);
            expect (isBypassed<0> (chain));
            setBypassed<0> (chain, false);
            expect (! isBypassed<0> (chain));

            setBypassed<1> (chain, true);
            expect (isBypassed<1> (chain));
            setBypassed<1> (chain, false);
            expect (! isBypassed<1> (chain));
        }

        beginTest ("After calling prepare, all processors are prepared");
        {
            ProcessorChain<MockProcessor<1>, MockProcessor<2>> chain;

            expect (! get<0> (chain).isPrepared);
            expect (! get<1> (chain).isPrepared);

            chain.prepare (ProcessSpec{});

            expect (get<0> (chain).isPrepared);
            expect (get<1> (chain).isPrepared);
        }

        beginTest ("After calling reset, all processors are reset");
        {
            ProcessorChain<MockProcessor<1>, MockProcessor<2>> chain;

            expect (! get<0> (chain).isReset);
            expect (! get<1> (chain).isReset);

            chain.reset();

            expect (get<0> (chain).isReset);
            expect (get<1> (chain).isReset);
        }

        beginTest ("After calling process, all processors contribute to processing");
        {
            ProcessorChain<MockProcessor<1>, MockProcessor<2>> chain;

            AudioBuffer<float> buffer (1, 1);
            AudioBlock<float> block (buffer);
            ProcessContextReplacing<float> context (block);

            block.clear();
            chain.process (context);
            expectEquals (buffer.getSample (0, 0), 3.0f);
            expect (get<0> (chain).bufferWasClear);
            expect (! get<1> (chain).bufferWasClear);

            setBypassed<0> (chain, true);
            block.clear();
            chain.process (context);
            expectEquals (buffer.getSample (0, 0), 2.0f);
            expect (get<0> (chain).bufferWasClear);
            expect (get<1> (chain).bufferWasClear);

            setBypassed<1> (chain, true);
            block.clear();
            chain.process (context);
            expectEquals (buffer.getSample (0, 0), 0.0f);
            expect (get<0> (chain).bufferWasClear);
            expect (get<1> (chain).bufferWasClear);

            setBypassed<0> (chain, false);
            block.clear();
            chain.process (context);
            expectEquals (buffer.getSample (0, 0), 1.0f);
            expect (get<0> (chain).bufferWasClear);
            expect (! get<1> (chain).bufferWasClear);
        }
    }
};

static ProcessorChainTest processorChainUnitTest;

} // namespace dsp
} // namespace juce