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

   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3

   Details of these licenses can be found at: www.gnu.org/licenses

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

   ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.

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

namespace PluginFormatManagerHelpers
{
    struct ErrorCallbackOnMessageThread : public CallbackMessage
    {
        ErrorCallbackOnMessageThread (const String& inError,
                                      AudioPluginFormat::InstantiationCompletionCallback* inCallback)
            : error (inError), callback (inCallback)
        {
        }

        void messageCallback() override          { callback->completionCallback (nullptr, error); }

        String error;
        ScopedPointer<AudioPluginFormat::InstantiationCompletionCallback> callback;
    };

   #if JUCE_COMPILER_SUPPORTS_LAMBDAS
    struct ErrorLambdaOnMessageThread : public CallbackMessage
    {
        ErrorLambdaOnMessageThread (const String& inError,
                                    std::function<void (AudioPluginInstance*, const String&)> f)
            : error (inError), lambda (f)
        {
        }

        void messageCallback() override          { lambda (nullptr, error); }

        String error;
        std::function<void (AudioPluginInstance*, const String&)> lambda;
    };
   #endif
}

AudioPluginFormatManager::AudioPluginFormatManager() {}
AudioPluginFormatManager::~AudioPluginFormatManager() {}

//==============================================================================
void AudioPluginFormatManager::addDefaultFormats()
{
   #if JUCE_DEBUG
    // you should only call this method once!
    for (int i = formats.size(); --i >= 0;)
    {
       #if JUCE_PLUGINHOST_VST && (JUCE_MAC || JUCE_WIN || JUCE_LINUX)
        jassert (dynamic_cast<VSTPluginFormat*> (formats[i]) == nullptr);
       #endif

       #if JUCE_PLUGINHOST_VST3 && (JUCE_MAC || JUCE_WIN)
        jassert (dynamic_cast<VST3PluginFormat*> (formats[i]) == nullptr);
       #endif

       #if JUCE_PLUGINHOST_AU && (JUCE_MAC || JUCE_IOS)
        jassert (dynamic_cast<AudioUnitPluginFormat*> (formats[i]) == nullptr);
       #endif

       #if JUCE_PLUGINHOST_LADSPA && JUCE_LINUX
        jassert (dynamic_cast<LADSPAPluginFormat*> (formats[i]) == nullptr);
       #endif
    }
   #endif

   #if JUCE_PLUGINHOST_AU && (JUCE_MAC || JUCE_IOS)
    formats.add (new AudioUnitPluginFormat());
   #endif

   #if JUCE_PLUGINHOST_VST && (JUCE_MAC || JUCE_WIN || JUCE_LINUX)
    formats.add (new VSTPluginFormat());
   #endif

   #if JUCE_PLUGINHOST_VST3 && (JUCE_MAC || JUCE_WIN)
    formats.add (new VST3PluginFormat());
   #endif

   #if JUCE_PLUGINHOST_LADSPA && JUCE_LINUX
    formats.add (new LADSPAPluginFormat());
   #endif
}

int AudioPluginFormatManager::getNumFormats()
{
    return formats.size();
}

AudioPluginFormat* AudioPluginFormatManager::getFormat (const int index)
{
    return formats [index];
}

void AudioPluginFormatManager::addFormat (AudioPluginFormat* const format)
{
    formats.add (format);
}

AudioPluginInstance* AudioPluginFormatManager::createPluginInstance (const PluginDescription& description, double rate,
                                                                     int blockSize, String& errorMessage) const
{
    if (AudioPluginFormat* format = findFormatForDescription (description, errorMessage))
        return format->createInstanceFromDescription (description, rate, blockSize, errorMessage);

    return nullptr;
}

void AudioPluginFormatManager::createPluginInstanceAsync (const PluginDescription& description,
                                                          double initialSampleRate,
                                                          int initialBufferSize,
                                                          AudioPluginFormat::InstantiationCompletionCallback* callback)
{
    String error;

    if (AudioPluginFormat* format = findFormatForDescription (description, error))
        return format->createPluginInstanceAsync (description, initialSampleRate, initialBufferSize, callback);

    (new PluginFormatManagerHelpers::ErrorCallbackOnMessageThread (error, callback))->post();
}

#if JUCE_COMPILER_SUPPORTS_LAMBDAS
void AudioPluginFormatManager::createPluginInstanceAsync (const PluginDescription& description,
                                                          double initialSampleRate,
                                                          int initialBufferSize,
                                                          std::function<void (AudioPluginInstance*, const String&)> f)
{
    String error;

    if (AudioPluginFormat* format = findFormatForDescription (description, error))
        return format->createPluginInstanceAsync (description, initialSampleRate, initialBufferSize, f);

    (new PluginFormatManagerHelpers::ErrorLambdaOnMessageThread (error, f))->post();
}
#endif

AudioPluginFormat* AudioPluginFormatManager::findFormatForDescription (const PluginDescription& description, String& errorMessage) const
{
    errorMessage = String();

    for (int i = 0; i < formats.size(); ++i)
    {
        AudioPluginFormat* format;

        if ((format = formats.getUnchecked (i))->getName() == description.pluginFormatName
               && format->fileMightContainThisPluginType (description.fileOrIdentifier))
            return format;
    }

    errorMessage = NEEDS_TRANS ("No compatible plug-in format exists for this plug-in");

    return nullptr;
}

bool AudioPluginFormatManager::doesPluginStillExist (const PluginDescription& description) const
{
    for (int i = 0; i < formats.size(); ++i)
        if (formats.getUnchecked(i)->getName() == description.pluginFormatName)
            return formats.getUnchecked(i)->doesPluginStillExist (description);

    return false;
}
