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+/*
+ * cocos2d for iPhone: http://www.cocos2d-iphone.org
+ *
+ * Copyright (c) 2009 Valentin Milea
+ *
+ * Copyright (c) 2008-2010 Ricardo Quesada
+ * Copyright (c) 2011 Zynga Inc.
+ *
+ * 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.
+ *
+ */
+
+
+#import "CCActionManager.h"
+#import "CCScheduler.h"
+#import "ccMacros.h"
+
+
+//
+// singleton stuff
+//
+static CCActionManager *sharedManager_ = nil;
+
+@interface CCActionManager (Private)
+-(void) removeActionAtIndex:(NSUInteger)index hashElement:(tHashElement*)element;
+-(void) deleteHashElement:(tHashElement*)element;
+-(void) actionAllocWithHashElement:(tHashElement*)element;
+@end
+
+
+@implementation CCActionManager
+
+#pragma mark ActionManager - init
++ (CCActionManager *)sharedManager
+{
+        if (!sharedManager_)
+                sharedManager_ = [[self alloc] init];
+                
+        return sharedManager_;
+}
+
++(id)alloc
+{
+        NSAssert(sharedManager_ == nil, @"Attempted to allocate a second instance of a singleton.");
+        return [super alloc];
+}
+
++(void)purgeSharedManager
+{
+        [[CCScheduler sharedScheduler] unscheduleUpdateForTarget:self];
+        [sharedManager_ release];
+        sharedManager_ = nil;
+}
+
+-(id) init
+{
+        if ((self=[super init]) ) {
+                [[CCScheduler sharedScheduler] scheduleUpdateForTarget:self priority:0 paused:NO];
+                targets = NULL;
+        }
+        
+        return self;
+}
+
+- (void) dealloc
+{
+        CCLOGINFO( @"cocos2d: deallocing %@", self);
+        
+        [self removeAllActions];
+
+        sharedManager_ = nil;
+
+        [super dealloc];
+}
+
+#pragma mark ActionManager - Private
+
+-(void) deleteHashElement:(tHashElement*)element
+{
+        ccArrayFree(element->actions);
+        HASH_DEL(targets, element);
+//      CCLOG(@"cocos2d: ---- buckets: %d/%d - %@", targets->entries, targets->size, element->target);
+        [element->target release];
+        free(element);
+}
+
+-(void) actionAllocWithHashElement:(tHashElement*)element
+{
+        // 4 actions per Node by default
+        if( element->actions == nil )
+                element->actions = ccArrayNew(4);
+        else if( element->actions->num == element->actions->max )
+                ccArrayDoubleCapacity(element->actions);        
+}
+
+-(void) removeActionAtIndex:(NSUInteger)index hashElement:(tHashElement*)element
+{       
+        id action = element->actions->arr[index];
+
+        if( action == element->currentAction && !element->currentActionSalvaged ) {
+                [element->currentAction retain];
+                element->currentActionSalvaged = YES;
+        }
+        
+        ccArrayRemoveObjectAtIndex(element->actions, index);
+
+        // 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 = YES;
+                else
+                        [self deleteHashElement: element];
+        }
+}
+
+#pragma mark ActionManager - Pause / Resume
+
+-(void) pauseTarget:(id)target
+{
+        tHashElement *element = NULL;
+        HASH_FIND_INT(targets, &target, element);
+        if( element )
+                element->paused = YES;
+//      else
+//              CCLOG(@"cocos2d: pauseAllActions: Target not found");
+}
+
+-(void) resumeTarget:(id)target
+{
+        tHashElement *element = NULL;
+        HASH_FIND_INT(targets, &target, element);
+        if( element )
+                element->paused = NO;
+//      else
+//              CCLOG(@"cocos2d: resumeAllActions: Target not found");
+}
+
+#pragma mark ActionManager - run
+
+-(void) addAction:(CCAction*)action target:(id)target paused:(BOOL)paused
+{
+        NSAssert( action != nil, @"Argument action must be non-nil");
+        NSAssert( target != nil, @"Argument target must be non-nil");   
+        
+        tHashElement *element = NULL;
+        HASH_FIND_INT(targets, &target, element);
+        if( ! element ) {
+                element = calloc( sizeof( *element ), 1 );
+                element->paused = paused;
+                element->target = [target retain];
+                HASH_ADD_INT(targets, target, element);
+//              CCLOG(@"cocos2d: ---- buckets: %d/%d - %@", targets->entries, targets->size, element->target);
+
+        }
+        
+        [self actionAllocWithHashElement:element];
+
+        NSAssert( !ccArrayContainsObject(element->actions, action), @"runAction: Action already running");      
+        ccArrayAppendObject(element->actions, action);
+        
+        [action startWithTarget:target];
+}
+
+#pragma mark ActionManager - remove
+
+-(void) removeAllActions
+{
+        for(tHashElement *element=targets; element != NULL; ) { 
+                id target = element->target;
+                element = element->hh.next;
+                [self removeAllActionsFromTarget:target];
+        }
+}
+-(void) removeAllActionsFromTarget:(id)target
+{
+        // explicit nil handling
+        if( target == nil )
+                return;
+        
+        tHashElement *element = NULL;
+        HASH_FIND_INT(targets, &target, element);
+        if( element ) {
+                if( ccArrayContainsObject(element->actions, element->currentAction) && !element->currentActionSalvaged ) {
+                        [element->currentAction retain];
+                        element->currentActionSalvaged = YES;
+                }
+                ccArrayRemoveAllObjects(element->actions);
+                if( currentTarget == element )
+                        currentTargetSalvaged = YES;
+                else
+                        [self deleteHashElement:element];
+        }
+//      else {
+//              CCLOG(@"cocos2d: removeAllActionsFromTarget: Target not found");
+//      }
+}
+
+-(void) removeAction: (CCAction*) action
+{
+        // explicit nil handling
+        if (action == nil)
+                return;
+        
+        tHashElement *element = NULL;
+        id target = [action originalTarget];
+        HASH_FIND_INT(targets, &target, element );
+        if( element ) {
+                NSUInteger i = ccArrayGetIndexOfObject(element->actions, action);
+                if( i != NSNotFound )
+                        [self removeActionAtIndex:i hashElement:element];
+        }
+//      else {
+//              CCLOG(@"cocos2d: removeAction: Target not found");
+//      }
+}
+
+-(void) removeActionByTag:(NSInteger)aTag target:(id)target
+{
+        NSAssert( aTag != kCCActionTagInvalid, @"Invalid tag");
+        NSAssert( target != nil, @"Target should be ! nil");
+        
+        tHashElement *element = NULL;
+        HASH_FIND_INT(targets, &target, element);
+        
+        if( element ) {
+                NSUInteger limit = element->actions->num;
+                for( NSUInteger i = 0; i < limit; i++) {
+                        CCAction *a = element->actions->arr[i];
+                        
+                        if( a.tag == aTag && [a originalTarget]==target) {
+                                [self removeActionAtIndex:i hashElement:element];
+                                break;
+                        }
+                }
+
+        }
+}
+
+#pragma mark ActionManager - get
+
+-(CCAction*) getActionByTag:(NSInteger)aTag target:(id)target
+{
+        NSAssert( aTag != kCCActionTagInvalid, @"Invalid tag");
+
+        tHashElement *element = NULL;
+        HASH_FIND_INT(targets, &target, element);
+
+        if( element ) {
+                if( element->actions != nil ) {
+                        NSUInteger limit = element->actions->num;
+                        for( NSUInteger i = 0; i < limit; i++) {
+                                CCAction *a = element->actions->arr[i];
+                        
+                                if( a.tag == aTag )
+                                        return a; 
+                        }
+                }
+//              CCLOG(@"cocos2d: getActionByTag: Action not found");
+        }
+//      else {
+//              CCLOG(@"cocos2d: getActionByTag: Target not found");
+//      }
+        return nil;
+}
+
+-(NSUInteger) numberOfRunningActionsInTarget:(id) target
+{
+        tHashElement *element = NULL;
+        HASH_FIND_INT(targets, &target, element);
+        if( element )
+                return element->actions ? element->actions->num : 0;
+
+//      CCLOG(@"cocos2d: numberOfRunningActionsInTarget: Target not found");
+        return 0;
+}
+
+#pragma mark ActionManager - main loop
+
+-(void) update: (ccTime) dt
+{
+        for(tHashElement *elt = targets; elt != NULL; ) {       
+
+                currentTarget = elt;
+                currentTargetSalvaged = NO;
+                
+                if( ! currentTarget->paused ) {
+                        
+                        // The 'actions' ccArray may change while inside this loop.
+                        for( currentTarget->actionIndex = 0; currentTarget->actionIndex < currentTarget->actions->num; currentTarget->actionIndex++) {
+                                currentTarget->currentAction = currentTarget->actions->arr[currentTarget->actionIndex];
+                                currentTarget->currentActionSalvaged = NO;
+                                
+                                [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];
+                                        
+                                        CCAction *a = currentTarget->currentAction;
+                                        // Make currentAction nil to prevent removeAction from salvaging it.
+                                        currentTarget->currentAction = nil;
+                                        [self removeAction:a];
+                                }
+                                
+                                currentTarget->currentAction = nil;
+                        }
+                }
+
+                // elt, at this moment, is still valid
+                // so it is safe to ask this here (issue #490)
+                elt = elt->hh.next;
+        
+                // only delete currentTarget if no actions were scheduled during the cycle (issue #481)
+                if( currentTargetSalvaged && currentTarget->actions->num == 0 )
+                        [self deleteHashElement:currentTarget];
+        }
+        
+        // issue #635
+        currentTarget = nil;
+}
+@end