//////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004-2021 musikcube team
//
// All rights reserved.
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// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
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//    * Redistributions of source code must retain the above copyright notice,
//      this list of conditions and the following disclaimer.
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//////////////////////////////////////////////////////////////////////////////

#include "pch.hpp"

#include "Streams.h"
#include <musikcore/debug.h>
#include <musikcore/sdk/IDecoderFactory.h>
#include <musikcore/sdk/IEncoderFactory.h>
#include <musikcore/plugin/PluginFactory.h>
#include <mutex>

#define TAG "Streams"

using namespace musik::core::audio;
using namespace musik::core::sdk;
using musik::core::PluginFactory;

using DataStreamPtr = musik::core::io::DataStreamFactory::DataStreamPtr;
using DecoderFactoryList = std::vector<std::shared_ptr<IDecoderFactory>>;
using EncoderFactoryList = std::vector<std::shared_ptr<IEncoderFactory>>;
using DspList = std::vector<std::shared_ptr<IDSP>>;
using Deleter = PluginFactory::ReleaseDeleter<IDecoder>;
using DecoderPtr = std::shared_ptr<IDecoder>;

static std::mutex initLock;
static DecoderFactoryList decoders;
static EncoderFactoryList encoders;

static void init() {
    std::unique_lock<std::mutex> lock(initLock);

    if (!decoders.size()) {
        using Deleter = PluginFactory::ReleaseDeleter<IDecoderFactory>;

        decoders = PluginFactory::Instance()
            .QueryInterface<IDecoderFactory, Deleter>("GetDecoderFactory");
    }

    if (!encoders.size()) {
        using Deleter = PluginFactory::ReleaseDeleter<IEncoderFactory>;

        encoders = PluginFactory::Instance()
            .QueryInterface<IEncoderFactory, Deleter>("GetEncoderFactory");
    }
}

namespace musik { namespace core { namespace audio {

    namespace streams {
        IDecoder* GetDecoderForDataStream(IDataStream* dataStream) {
            init();

            IDecoder* decoder = nullptr;

            /* find a DecoderFactory we can use for this type of data*/
            DecoderFactoryList::iterator factories = decoders.begin();
            DecoderFactoryList::iterator end = decoders.end();
            std::shared_ptr<IDecoderFactory> factory;

            for (; factories != end && !factory; ++factories) {
                if ((*factories)->CanHandle(dataStream->Type())) {
                    factory = (*factories);
                    break;
                }
            }

            const std::string uri = dataStream->Uri();

            if (!factory) {
                /* nothing can decode this type of file */
                musik::debug::error(TAG, "nothing could open " + uri);
                return nullptr;
            }

            decoder = factory->CreateDecoder();

            if (!decoder) {
                /* shouldn't ever happen, the factory said it can handle this file */
                return nullptr;
            }

            /* ask the decoder to open the data stream. if it returns true we're
            good to start pulling data out of it! */
            if (!decoder->Open(dataStream)) {
                musik::debug::error(TAG, "open ok, but decode failed " + uri);
                decoder->Release();
                return nullptr;
            }

            musik::debug::info(TAG, "found a decoder for " + uri);

            return decoder;
        }

        IEncoder* GetEncoderForType(const char* type) {
            init();

            for (auto factory : encoders) {
                if (factory->CanHandle(type)) {
                    return factory->CreateEncoder(type);
                }
            }

            return nullptr;
        }

        std::shared_ptr<IDecoder> GetDecoderForDataStream(DataStreamPtr dataStream) {
            auto decoder = GetDecoderForDataStream(dataStream.get());
            return decoder ? DecoderPtr(decoder, Deleter()) : DecoderPtr();
        }

        DspList GetDspPlugins() {
            typedef PluginFactory::ReleaseDeleter<IDSP> Deleter;
            return PluginFactory::Instance().QueryInterface<IDSP, Deleter>("GetDSP");
        }
    };

} } }