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

   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-8-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.

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

#if JUCE_INTERNAL_HAS_VST || DOXYGEN

namespace juce
{

//==============================================================================
/**
    Implements a plugin format manager for VSTs.

    @tags{Audio}
*/
class JUCE_API  VSTPluginFormatHeadless   : public AudioPluginFormat
{
public:
    //==============================================================================
    VSTPluginFormatHeadless() = default;

    //==============================================================================
    /** Attempts to retrieve the VSTXML data from a plugin.
        Will return nullptr if the plugin isn't a VST, or if it doesn't have any VSTXML.
    */
    static const XmlElement* getVSTXML (AudioPluginInstance* plugin);

    /** Attempts to reload a VST plugin's state from some FXB or FXP data. */
    static bool loadFromFXBFile (AudioPluginInstance* plugin, const void* data, size_t dataSize);

    /** Attempts to save a VST's state to some FXP or FXB data. */
    static bool saveToFXBFile (AudioPluginInstance* plugin, MemoryBlock& result, bool asFXB);

    /** Attempts to get a VST's state as a chunk of memory. */
    static bool getChunkData (AudioPluginInstance* plugin, MemoryBlock& result, bool isPreset);

    /** Attempts to set a VST's state from a chunk of memory. */
    static bool setChunkData (AudioPluginInstance* plugin, const void* data, int size, bool isPreset);

    /** Given a suitable function pointer to a VSTPluginMain function, this will attempt to
        instantiate and return a plugin for it.
    */
    static AudioPluginInstance* createCustomVSTFromMainCall (void* entryPointFunction,
                                                             double initialSampleRate,
                                                             int initialBufferSize);

    //==============================================================================
    /** Base class for some extra functions that can be attached to a VST plugin instance. */
    class ExtraFunctions
    {
    public:
        virtual ~ExtraFunctions() {}

        /** This should return 10000 * the BPM at this position in the current edit. */
        virtual int64 getTempoAt (int64 samplePos) = 0;

        /** This should return the host's automation state.
            @returns 0 = not supported, 1 = off, 2 = read, 3 = write, 4 = read/write
        */
        virtual int getAutomationState() = 0;
    };

    /** Provides an ExtraFunctions callback object for a plugin to use.
        The plugin will take ownership of the object and will delete it automatically.
    */
    static void setExtraFunctions (AudioPluginInstance* plugin, ExtraFunctions* functions);

    //==============================================================================
    /** This simply calls directly to the VST's AEffect::dispatcher() function. */
    static pointer_sized_int JUCE_CALLTYPE dispatcher (AudioPluginInstance*, int32, int32, pointer_sized_int, void*, float);

    /** Given a VstEffectInterface* (aka vst::AEffect*), this will return the juce AudioPluginInstance
        that is being used to wrap it
    */
    static AudioPluginInstance* getPluginInstanceFromVstEffectInterface (void* aEffect);

    //==============================================================================
    static String getFormatName()                   { return "VST"; }
    String getName() const override                 { return getFormatName(); }
    bool canScanForPlugins() const override         { return true; }
    bool isTrivialToScan() const override           { return false; }

    void findAllTypesForFile (OwnedArray<PluginDescription>&, const String& fileOrIdentifier) override;
    bool fileMightContainThisPluginType (const String& fileOrIdentifier) override;
    String getNameOfPluginFromIdentifier (const String& fileOrIdentifier) override;
    bool pluginNeedsRescanning (const PluginDescription&) override;
    StringArray searchPathsForPlugins (const FileSearchPath&, bool recursive, bool) override;
    bool doesPluginStillExist (const PluginDescription&) override;
    FileSearchPath getDefaultLocationsToSearch() override;

    /** Can be overridden to receive a callback when each member of a shell plugin is about to be
        tested during a call to findAllTypesForFile().
        Only the name and uid members of the PluginDescription are guaranteed to be valid when
        this is called.
    */
    virtual void aboutToScanVSTShellPlugin (const PluginDescription&);

private:
    //==============================================================================
    void createPluginInstance (const PluginDescription&, double initialSampleRate,
                               int initialBufferSize, PluginCreationCallback) override;
    bool requiresUnblockedMessageThreadDuringCreation (const PluginDescription&) const override;
    void recursiveFileSearch (StringArray&, const File&, bool recursive);

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (VSTPluginFormatHeadless)
};

} // namespace juce

#endif
