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

This file is part of the JUCE library.
Copyright (c) 2017 - ROLI Ltd.

JUCE is an open source library subject to commercial or open-source
licensing.

The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.

JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.

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


namespace juce
{

#if JUCE_ENABLE_AUDIO_GUARD
AudioThreadGuard::AudioThreadGuard()
{
	auto id = Thread::getCurrentThreadId();
	audioThreadIds.addIfNotAlreadyThere(id);

	numActive++;
}

AudioThreadGuard::AudioThreadGuard(Instance* currentInstance)
{
	previousInstance = instance;
	useCustomInstance = true;
	setInstance(currentInstance);

	auto id = Thread::getCurrentThreadId();
	audioThreadIds.addIfNotAlreadyThere(id);

	numActive++;
}

AudioThreadGuard::~AudioThreadGuard()
{
	if (useCustomInstance)
		setInstance(previousInstance);

	numActive--;
}

void AudioThreadGuard::warnIf(bool condition, int op)
{
	if (condition)
	{
		warn(op);
	}
}

void AudioThreadGuard::warn(int op)
{
	if (suspended)
		return;

	if (numActive <= 0)
		return;

	if (instance == nullptr)
		return;

	auto threadId = Thread::getCurrentThreadId();

	if (!audioThreadIds.contains(threadId))
		return;

	if (instance->test())
	{
		// You might want to do log something so we turn of the guard for this method.
		Suspender suspender;
		instance->warn((int)op);
	}
}

void AudioThreadGuard::setInstance(Instance* newInstance)
{
	instance = newInstance;
}

AudioThreadGuard::Suspender::Suspender(bool shouldDoSomething /*= true*/)
{
	if (shouldDoSomething && AudioThreadGuard::instance != nullptr && AudioThreadGuard::instance->test())
	{
		AudioThreadGuard::suspended = true;
		isSuspended = true;
	}
}

AudioThreadGuard::Suspender::~Suspender()
{
	if (isSuspended)
		AudioThreadGuard::suspended = false;
}

AudioThreadGuard::Instance::~Instance()
{
	jassert(AudioThreadGuard::instance != this);
}

juce::String AudioThreadGuard::Instance::getOperationName(int operationType)
{
	switch (operationType)
	{
	case IllegalAudioThreadOps::Unspecified:			return "Unspecified";
	case IllegalAudioThreadOps::HeapBlockAllocation:	return "HeapBlock allocation";
	case IllegalAudioThreadOps::HeapBlockDeallocation: return "HeapBlock free";
	case IllegalAudioThreadOps::StringCreation:		return "String creation";
	default:
		break;
	}

	return {};
}

bool AudioThreadGuard::suspended = false;
std::atomic<int> AudioThreadGuard::numActive = 0;
AudioThreadGuard::Instance* AudioThreadGuard::instance = nullptr;
Array<void*> AudioThreadGuard::audioThreadIds;

AudioThreadGuard::ScopedInstanceSetter::ScopedInstanceSetter(Instance* instance) :
	previousInstance(AudioThreadGuard::instance)
{
	AudioThreadGuard::setInstance(instance);
}

AudioThreadGuard::ScopedInstanceSetter::~ScopedInstanceSetter()
{
	AudioThreadGuard::setInstance(previousInstance);
}
#endif

} // namespace juce