/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2009      Valentin Milea
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
CopyRight (c) 2013-2014 Chukong Technologies Inc.
 
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
copies of the Software, and to permit persons to whom the Software is
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
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 "2d/CCActionManager.h"
#include "2d/CCNode.h"
#include "2d/CCAction.h"
#include "base/CCScheduler.h"
#include "base/ccMacros.h"
#include "base/ccCArray.h"
#include "base/uthash.h"

NS_CC_BEGIN
//
// singleton stuff
//
typedef struct _hashElement
{
    struct _ccArray     *actions;
    Node                *target;
    int                 actionIndex;
    Action              *currentAction;
    bool                currentActionSalvaged;
    bool                paused;
    UT_hash_handle      hh;
} tHashElement;

ActionManager::ActionManager()
: _targets(nullptr),
  _currentTarget(nullptr),
  _currentTargetSalvaged(false)
{

}

ActionManager::~ActionManager()
{
    CCLOGINFO("deallocing ActionManager: %p", this);

    removeAllActions();
}

// private

void ActionManager::deleteHashElement(tHashElement *element)
{
    ccArrayFree(element->actions);
    HASH_DEL(_targets, element);
    element->target->release();
    free(element);
}

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

}

void ActionManager::removeActionAtIndex(ssize_t index, tHashElement *element)
{
    Action *action = (Action*)element->actions->arr[index];

    if (action == element->currentAction && (! element->currentActionSalvaged))
    {
        element->currentAction->retain();
        element->currentActionSalvaged = true;
    }

    ccArrayRemoveObjectAtIndex(element->actions, index, true);

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

    if (element->actions->num == 0)
    {
        if (_currentTarget == element)
        {
            _currentTargetSalvaged = true;
        }
        else
        {
            deleteHashElement(element);
        }
    }
}

// pause / resume

void ActionManager::pauseTarget(Node *target)
{
    tHashElement *element = nullptr;
    HASH_FIND_PTR(_targets, &target, element);
    if (element)
    {
        element->paused = true;
    }
}

void ActionManager::resumeTarget(Node *target)
{
    tHashElement *element = nullptr;
    HASH_FIND_PTR(_targets, &target, element);
    if (element)
    {
        element->paused = false;
    }
}

Vector<Node*> ActionManager::pauseAllRunningActions()
{
    Vector<Node*> idsWithActions;
    
    for (tHashElement *element=_targets; element != nullptr; element = (tHashElement *)element->hh.next) 
    {
        if (! element->paused) 
        {
            element->paused = true;
            idsWithActions.pushBack(element->target);
        }
    }    
    
    return idsWithActions;
}

void ActionManager::resumeTargets(const Vector<Node*>& targetsToResume)
{
    for(const auto &node : targetsToResume) {
        this->resumeTarget(node);
    }
}

// run

void ActionManager::addAction(Action *action, Node *target, bool paused)
{
    CCASSERT(action != nullptr, "");
    CCASSERT(target != nullptr, "");

    tHashElement *element = nullptr;
    // we should convert it to Ref*, because we save it as Ref*
    Ref *tmp = target;
    HASH_FIND_PTR(_targets, &tmp, element);
    if (! element)
    {
        element = (tHashElement*)calloc(sizeof(*element), 1);
        element->paused = paused;
        target->retain();
        element->target = target;
        HASH_ADD_PTR(_targets, target, element);
    }

     actionAllocWithHashElement(element);
 
     CCASSERT(! ccArrayContainsObject(element->actions, action), "");
     ccArrayAppendObject(element->actions, action);
 
     action->startWithTarget(target);
}

// remove

void ActionManager::removeAllActions()
{
    for (tHashElement *element = _targets; element != nullptr; )
    {
        auto target = element->target;
        element = (tHashElement*)element->hh.next;
        removeAllActionsFromTarget(target);
    }
}

void ActionManager::removeAllActionsFromTarget(Node *target)
{
    // explicit null handling
    if (target == nullptr)
    {
        return;
    }

    tHashElement *element = nullptr;
    HASH_FIND_PTR(_targets, &target, element);
    if (element)
    {
        if (ccArrayContainsObject(element->actions, element->currentAction) && (! element->currentActionSalvaged))
        {
            element->currentAction->retain();
            element->currentActionSalvaged = true;
        }

        ccArrayRemoveAllObjects(element->actions);
        if (_currentTarget == element)
        {
            _currentTargetSalvaged = true;
        }
        else
        {
            deleteHashElement(element);
        }
    }
    else
    {
//        CCLOG("cocos2d: removeAllActionsFromTarget: Target not found");
    }
}

void ActionManager::removeAction(Action *action)
{
    // explicit null handling
    if (action == nullptr)
    {
        return;
    }

    tHashElement *element = nullptr;
    Ref *target = action->getOriginalTarget();
    HASH_FIND_PTR(_targets, &target, element);
    if (element)
    {
        auto i = ccArrayGetIndexOfObject(element->actions, action);
        if (i != CC_INVALID_INDEX)
        {
            removeActionAtIndex(i, element);
        }
    }
    else
    {
        CCLOG("cocos2d: removeAction: Target not found");
    }
}

void ActionManager::removeActionByTag(int tag, Node *target)
{
    CCASSERT(tag != Action::INVALID_TAG, "");
    CCASSERT(target != nullptr, "");

    tHashElement *element = nullptr;
    HASH_FIND_PTR(_targets, &target, element);

    if (element)
    {
        auto limit = element->actions->num;
        for (int i = 0; i < limit; ++i)
        {
            Action *action = (Action*)element->actions->arr[i];

            if (action->getTag() == (int)tag && action->getOriginalTarget() == target)
            {
                removeActionAtIndex(i, element);
                break;
            }
        }
    }
}

void ActionManager::removeAllActionsByTag(int tag, Node *target)
{
    CCASSERT(tag != Action::INVALID_TAG, "");
    CCASSERT(target != nullptr, "");
    
    tHashElement *element = nullptr;
    HASH_FIND_PTR(_targets, &target, element);
    
    if (element)
    {
        auto limit = element->actions->num;
        for (int i = 0; i < limit;)
        {
            Action *action = (Action*)element->actions->arr[i];
            
            if (action->getTag() == (int)tag && action->getOriginalTarget() == target)
            {
                removeActionAtIndex(i, element);
                --limit;
            }
            else
            {
                ++i;
            }
        }
    }
}

// get

// FIXME: Passing "const O *" instead of "const O&" because HASH_FIND_IT requries the address of a pointer
// and, it is not possible to get the address of a reference
Action* ActionManager::getActionByTag(int tag, const Node *target) const
{
    CCASSERT(tag != Action::INVALID_TAG, "");

    tHashElement *element = nullptr;
    HASH_FIND_PTR(_targets, &target, element);

    if (element)
    {
        if (element->actions != nullptr)
        {
            auto limit = element->actions->num;
            for (int i = 0; i < limit; ++i)
            {
                Action *action = (Action*)element->actions->arr[i];

                if (action->getTag() == (int)tag)
                {
                    return action;
                }
            }
        }
        //CCLOG("cocos2d : getActionByTag(tag = %d): Action not found", tag);
    }
    else
    {
        // CCLOG("cocos2d : getActionByTag: Target not found");
    }

    return nullptr;
}

// FIXME: Passing "const O *" instead of "const O&" because HASH_FIND_IT requries the address of a pointer
// and, it is not possible to get the address of a reference
ssize_t ActionManager::getNumberOfRunningActionsInTarget(const Node *target) const
{
    tHashElement *element = nullptr;
    HASH_FIND_PTR(_targets, &target, element);
    if (element)
    {
        return element->actions ? element->actions->num : 0;
    }

    return 0;
}

// main loop
void ActionManager::update(float dt)
{
    for (tHashElement *elt = _targets; elt != nullptr; )
    {
        _currentTarget = elt;
        _currentTargetSalvaged = false;

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

                _currentTarget->currentActionSalvaged = false;

                _currentTarget->currentAction->step(dt);

                if (_currentTarget->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.
                    _currentTarget->currentAction->release();
                } else
                if (_currentTarget->currentAction->isDone())
                {
                    _currentTarget->currentAction->stop();

                    Action *action = _currentTarget->currentAction;
                    // Make currentAction nil to prevent removeAction from salvaging it.
                    _currentTarget->currentAction = nullptr;
                    removeAction(action);
                }

                _currentTarget->currentAction = nullptr;
            }
        }

        // 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 (_currentTargetSalvaged && _currentTarget->actions->num == 0)
        {
            deleteHashElement(_currentTarget);
        }
    }

    // issue #635
    _currentTarget = nullptr;
}

NS_CC_END
