/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "CCActionManager.h"
#include "CCScheduler.h"
#include "ccMacros.h"
#include "support/data_support/ccArray.h"
#include "Cocos2dDefine.h"

namespace cocos2d {
//
// singleton stuff
//
static CCActionManager *gSharedManager = NULL;

CCActionManager* CCActionManager::getSharedManager(void)
{
	CCActionManager *pRet = gSharedManager;

	if (! gSharedManager)
	{
		pRet = gSharedManager = new CCActionManager();

		if (! gSharedManager->init())
		{
			// delete CCActionManager if init error
			delete gSharedManager;
			gSharedManager = NULL;
			pRet = NULL;
		}
	}

	return pRet;
}

void CCActionManager::purgeSharedManager(void)
{
	CCScheduler::getSharedScheduler()->unscheduleUpdateForTarget(this);
	CCX_SAFE_RELEASE(gSharedManager);
}

void CCActionManager::selectorProtocolRetain()
{
	retain();
}

void CCActionManager::selectorProtocolRelease()
{
	release();
}

CCActionManager::CCActionManager(void)
{
	assert(gSharedManager == NULL);
}

CCActionManager::~CCActionManager(void)
{
	CCLOGINFO("cocos2d: deallocing %p", this);

	removeAllActions();

	// ?? do not delete , is it because purgeSharedManager() delete it? 
	gSharedManager = NULL;
}

CCActionManager* CCActionManager::init(void)
{
	CCScheduler::getSharedScheduler()->scheduleUpdateForTarget(this, 0, false);
	m_pTargets = NULL;

	return this;
}

// private

void CCActionManager::deleteHashElement(tHashElement *pElement)
{
	ccArrayFree(pElement->actions);
	HASH_DEL(m_pTargets, pElement);
	pElement->target->release();
	free(pElement);
}

void CCActionManager::actionAllocWithHashElement(tHashElement *pElement)
{
	// 4 actions per Node by default
	if (pElement->actions == NULL)
	{
		pElement->actions = ccArrayNew(4);
	}else 
	if (pElement->actions->num == pElement->actions->max)
	{
		ccArrayDoubleCapacity(pElement->actions);
	}

}

void CCActionManager::removeActionAtIndex(unsigned int uIndex, tHashElement *pElement)
{
	CCAction *pAction = (CCAction*)pElement->actions->arr[uIndex];

	if (pAction == pElement->currentAction && (! pElement->currentActionSalvaged))
	{
		pElement->currentAction->retain();
		pElement->currentActionSalvaged = true;
	}

	ccArrayRemoveObjectAtIndex(pElement->actions, uIndex);

	// update actionIndex in case we are in tick. looping over the actions
	if (pElement->actionIndex >= uIndex)
	{
		pElement->actionIndex--;
	}

	if (pElement->actions->num == 0)
	{
		if (m_pCurrentTarget == pElement)
		{
			m_bCurrentTargetSalvaged = true;
		}
		else
		{
			deleteHashElement(pElement);
		}
	}
}

// pause / resume

// XXX DEPRECATED. REMOVE IN 1.0
void CCActionManager::pauseAllActionsForTarget(NSObject *pTarget)
{
	pauseTarget(pTarget);
}

void CCActionManager::pauseTarget(NSObject *pTarget)
{
	tHashElement *pElement = NULL;
	HASH_FIND_INT(m_pTargets, &pTarget, pElement);
	if (pElement)
	{
		pElement->paused = true;
	}
}

// XXX DEPRECATED. REMOVE IN 1.0
void CCActionManager::resumeAllActionsForTarget(NSObject *pTarget)
{
	resumeTarget(pTarget);
}

void CCActionManager::resumeTarget(NSObject *pTarget)
{
	tHashElement *pElement = NULL;
	HASH_FIND_INT(m_pTargets, &pTarget, pElement);
	if (pElement)
	{
		pElement->paused = false;
	}
}

// run

void CCActionManager::addAction(cocos2d::CCAction *pAction, CCNode *pTarget, bool paused)
{
	assert(pAction != NULL);
	assert(pTarget != NULL);

	tHashElement *pElement = NULL;
	HASH_FIND_INT(m_pTargets, &pTarget, pElement);
	if (! pElement)
	{
		pElement = (tHashElement*)calloc(sizeof(*pElement), 1);
		pElement->paused = paused;
		pTarget->retain();
		pElement->target = pTarget;
		HASH_ADD_INT(m_pTargets, target, pElement);
	}

	actionAllocWithHashElement(pElement);

	assert(! ccArrayContainsObject(pElement->actions, pAction));
	ccArrayAppendObject(pElement->actions, pAction);

	pAction->startWithTarget(pTarget);
}

// remove

void CCActionManager::removeAllActions(void)
{
	for (tHashElement *pElement = m_pTargets; pElement != NULL; )
	{
		NSObject *pTarget = pElement->target;
		pElement = (tHashElement*)pElement->hh.next;
		removeAllActionsFromTarget(pTarget);
	}
}

void CCActionManager::removeAllActionsFromTarget(NSObject *pTarget)
{
	// explicit null handling
	if (pTarget == NULL)
	{
		return;
	}

	tHashElement *pElement = NULL;
	HASH_FIND_INT(m_pTargets, &pTarget, pElement);
	if (pElement)
	{
		if (ccArrayContainsObject(pElement->actions, pElement->currentAction) && (! pElement->currentActionSalvaged))
		{
			pElement->currentAction->retain();
			pElement->currentActionSalvaged = true;
		}

		ccArrayRemoveAllObjects(pElement->actions);
		if (m_pCurrentTarget == pElement)
		{
			m_bCurrentTargetSalvaged = true;
		}
		else
		{
			deleteHashElement(pElement);
		}
	}
	else
	{
		CCLOG("cocos2d: removeAllActionsFromTarget: Target not found");
	}
}

void CCActionManager::removeAction(cocos2d::CCAction *pAction)
{
	// explicit null handling
	if (pAction == NULL)
	{
		return;
	}

	tHashElement *pElement = NULL;
	NSObject *pTarget = pAction->getOriginalTarget();
	HASH_FIND_INT(m_pTargets, &pTarget, pElement);
	if (pElement)
	{
		unsigned int i = ccArrayGetIndexOfObject(pElement->actions, pAction);
		if (i != -1)
		{
			removeActionAtIndex(i, pElement);
		}
	}
	else
	{
		CCLOG("cocos2d: removeAction: Target not found");
	}
}

void CCActionManager::removeActionByTag(int tag, NSObject *pTarget)
{
	assert(tag != kCCActionTagInvalid);
	assert(pTarget != NULL);

	tHashElement *pElement = NULL;
	HASH_FIND_INT(m_pTargets, &pTarget, pElement);

	if (pElement)
	{
		unsigned int limit = pElement->actions->num;
		for (unsigned int i = 0; i < limit; ++i)
		{
			CCAction *pAction = (CCAction*)pElement->actions->arr[i];

			if (pAction->getTag() == tag && pAction->getOriginalTarget() == pTarget)
			{
				return removeActionAtIndex(i, pElement);
			}
		}
		CCLOG("cocos2d: removeActionByTag: Action not found!");
	}
	else
	{
		CCLOG("cocos2d: removeActionByTag: Target not found!");
	}
}

// get

CCAction* CCActionManager::getActionByTag(int tag, NSObject *pTarget)
{
	assert(tag != kCCActionTagInvalid);

	tHashElement *pElement = NULL;
	HASH_FIND_INT(m_pTargets, &pTarget, pElement);

	if (pElement)
	{
		if (pElement->actions != NULL)
		{
			unsigned int limit = pElement->actions->num;
			for (unsigned int i = 0; i < limit; ++i)
			{
				CCAction *pAction = (CCAction*)pElement->actions->arr[i];

				if (pAction->getTag() == tag)
				{
					return pAction;
				}
			}
		}
		CCLOG("cocos2d : getActionByTag: Action not found");
	}
	else
	{
        CCLOG("cocos2d : getActionByTag: Target not found");
	}

	return NULL;
}

int CCActionManager::numberOfRunningActionsInTarget(NSObject *pTarget)
{
	tHashElement *pElement = NULL;
	HASH_FIND_INT(m_pTargets, &pTarget, pElement);
	if (pElement)
	{
		return pElement->actions ? pElement->actions->num : 0;
	}

	return 0;
}

// main loop
void CCActionManager::update(cocos2d::ccTime dt)
{
	for (tHashElement *elt = m_pTargets; elt != NULL; )
	{
		m_pCurrentTarget = elt;
		m_bCurrentTargetSalvaged = false;

		if (! m_pCurrentTarget->paused)
		{
			// The 'actions' NSMutableArray may change while inside this loop.
			for (m_pCurrentTarget->actionIndex = 0; m_pCurrentTarget->actionIndex < m_pCurrentTarget->actions->num;
				m_pCurrentTarget->actionIndex++)
			{
				m_pCurrentTarget->currentAction = (CCAction*)m_pCurrentTarget->actions->arr[m_pCurrentTarget->actionIndex];
				if (m_pCurrentTarget->currentAction == NULL)
				{
					continue;
				}

				m_pCurrentTarget->currentActionSalvaged = false;

				m_pCurrentTarget->currentAction->step(dt);

				if (m_pCurrentTarget->currentActionSalvaged)
				{
					// The currentAction told the node to remove it. To prevent the action from
					// accidentally deallocating itself before finishing its step, we retained
					// it. Now that step is done, it's safe to release it.
					m_pCurrentTarget->currentAction->release();
				} else
				if (m_pCurrentTarget->currentAction->isDone())
				{
					m_pCurrentTarget->currentAction->stop();

					CCAction *pAction = m_pCurrentTarget->currentAction;
					// Make currentAction nil to prevent removeAction from salvaging it.
					m_pCurrentTarget->currentAction = NULL;
					removeAction(pAction);
				}

				m_pCurrentTarget->currentAction = NULL;
			}
		}

		// elt, at this moment, is still valid
		// so it is safe to ask this here (issue #490)
		elt = (tHashElement*)(elt->hh.next);

		// only delete currentTarget if no actions were scheduled during the cycle (issue #481)
		if (m_bCurrentTargetSalvaged && m_pCurrentTarget->actions->num == 0)
		{
			deleteHashElement(m_pCurrentTarget);
		}
	}

	// issue #635
	m_pCurrentTarget = NULL;
}

}