/*****************************************************************************
Copyright (C) 2016-2017 by Colin Edwards.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This program 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.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*****************************************************************************/

#include "../headers/VSTPlugin.h"

AEffect *VSTPlugin::loadEffect()
{
    AEffect *newEffect = NULL;

    // Create a path to the bundle
    CFStringRef pluginPathStringRef = CFStringCreateWithCString(NULL, pluginPath.c_str(), kCFStringEncodingUTF8);
    CFURLRef bundleUrl =
        CFURLCreateWithFileSystemPath(kCFAllocatorDefault, pluginPathStringRef, kCFURLPOSIXPathStyle, true);

    if (bundleUrl == NULL) {
        CFRelease(pluginPathStringRef);
        blog(LOG_WARNING, "Couldn't make URL reference for VST plug-in");
        return NULL;
    }

    // Open the bundle
    bundle = CFBundleCreate(kCFAllocatorDefault, bundleUrl);
    if (bundle == NULL) {
        blog(LOG_WARNING, "Couldn't create VST bundle reference.");
        CFRelease(pluginPathStringRef);
        CFRelease(bundleUrl);
        return NULL;
    }

    vstPluginMain mainEntryPoint = NULL;
    mainEntryPoint = (vstPluginMain) CFBundleGetFunctionPointerForName(bundle, CFSTR("VSTPluginMain"));

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

    if (mainEntryPoint == NULL) {
        blog(LOG_WARNING, "Couldn't get a pointer to plug-in's main()");
        CFRelease(pluginPathStringRef);
        CFRelease(bundleUrl);
        CFRelease(bundle);
        bundle = NULL;
        return NULL;
    }

    newEffect = mainEntryPoint(hostCallback_static);
    if (newEffect == NULL) {
        blog(LOG_WARNING, "VST Plug-in's main() returns null.");
        CFRelease(pluginPathStringRef);
        CFRelease(bundleUrl);
        CFRelease(bundle);
        bundle = NULL;
        return NULL;
    }

    newEffect->user = this;

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

    return newEffect;
}

void VSTPlugin::unloadLibrary()
{
    if (bundle) {
        CFRelease(bundle);
        bundle = NULL;
    }
}

bool VSTPlugin::vstLoaded()
{
    return (bundle != NULL);
}