//
// PluginVst2xMac.c - MrsWatson
// Created by Nik Reiman on 13 May 13.
// Copyright (c) 2013 Teragon Audio. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//

#if MACOSX
#define VST_FORCE_DEPRECATED 0
#include "aeffectx.h"

extern "C" {
#include <stdlib.h>
#include <CoreFoundation/CFBundle.h>
#include "base/CharString.h"
#include "logging/EventLogger.h"
#include "plugin/PluginVst2xHostCallback.h"

    LinkedList getVst2xPluginLocations(CharString currentDirectory);
    LinkedList getVst2xPluginLocations(CharString currentDirectory)
    {
        LinkedList locations = newLinkedList();
        CharString locationBuffer;

        linkedListAppend(locations, currentDirectory);

        locationBuffer = newCharString();
        snprintf(locationBuffer->data, (size_t)(locationBuffer->capacity), "/Library/Audio/Plug-Ins/VST");
        linkedListAppend(locations, locationBuffer);

        locationBuffer = newCharString();
        snprintf(locationBuffer->data, (size_t)(locationBuffer->capacity), "%s/Library/Audio/Plug-Ins/VST", getenv("HOME"));
        linkedListAppend(locations, locationBuffer);

        return locations;
    }

    LibraryHandle getLibraryHandleForPlugin(const CharString pluginAbsolutePath);
    LibraryHandle getLibraryHandleForPlugin(const CharString pluginAbsolutePath)
    {
        // Create a path to the bundle
        CFStringRef pluginPathStringRef = CFStringCreateWithCString(NULL, pluginAbsolutePath->data, kCFStringEncodingASCII);
        CFURLRef bundleUrl = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, pluginPathStringRef, kCFURLPOSIXPathStyle, true);

        if (bundleUrl == NULL) {
            logError("Couldn't make URL reference for plugin");
            return NULL;
        }

        // Open the bundle
        CFBundleRef bundleRef = CFBundleCreate(kCFAllocatorDefault, bundleUrl);

        if (bundleRef == NULL) {
            logError("Couldn't create bundle reference");
            CFRelease(pluginPathStringRef);
            CFRelease(bundleUrl);
            return NULL;
        }

        // Clean up
        CFRelease(pluginPathStringRef);
        CFRelease(bundleUrl);

        return bundleRef;
    }

    AEffect *loadVst2xPlugin(LibraryHandle libraryHandle);
    AEffect *loadVst2xPlugin(LibraryHandle libraryHandle)
    {
        // Somewhat cheap hack to avoid a tricky compiler warning. Casting from void* to a proper function
        // pointer will cause GCC to warn that "ISO C++ forbids casting between pointer-to-function and
        // pointer-to-object". Here, we represent both types in a union and use the correct one in the given
        // context, thus avoiding the need to cast anything.
        // See also: http://stackoverflow.com/a/2742234/14302
        union {
            Vst2xPluginEntryFunc entryPointFuncPtr;
            void *entryPointVoidPtr;
        } entryPoint;

        entryPoint.entryPointVoidPtr = CFBundleGetFunctionPointerForName(libraryHandle, CFSTR("VSTPluginMain"));
        Vst2xPluginEntryFunc mainEntryPoint = entryPoint.entryPointFuncPtr;

        // VST plugins previous to the 2.4 SDK used main_macho for the entry point name
        if (mainEntryPoint == NULL) {
            entryPoint.entryPointVoidPtr = CFBundleGetFunctionPointerForName(libraryHandle, CFSTR("main_macho"));
            mainEntryPoint = entryPoint.entryPointFuncPtr;
        }

        if (mainEntryPoint == NULL) {
            logError("Couldn't get a pointer to plugin's main()");
            CFBundleUnloadExecutable(libraryHandle);
            CFRelease(libraryHandle);
            return NULL;
        }

        AEffect *plugin = mainEntryPoint(pluginVst2xHostCallback);

        if (plugin == NULL) {
            logError("Plugin's main() returns null");
            CFBundleUnloadExecutable(libraryHandle);
            CFRelease(libraryHandle);
            return NULL;
        }

        return plugin;
    }

    void closeLibraryHandle(LibraryHandle libraryHandle);
    void closeLibraryHandle(LibraryHandle libraryHandle)
    {
        CFBundleUnloadExecutable(libraryHandle);
        CFRelease(libraryHandle);
    }

} // extern "C"
#endif