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****************************************************************************/

/** 
 @file
 Based on Chipmunk cpArray.
 ccArray is a faster alternative to NSMutableArray, it does pretty much the
 same thing (stores NSObjects and retains/releases them appropriately). It's
 faster because:
 - it uses a plain C interface so it doesn't incur Objective-c messaging overhead 
 - it assumes you know what you're doing, so it doesn't spend time on safety checks
   (index out of bounds, required capacity etc.)
 - comparisons are done using pointer equality instead of isEqual
 */

#ifndef CC_ARRAY_H
#define CC_ARRAY_H

#include <stdlib.h>
#include <string.h>

#include "NSMutableArray.h"
#include "NSObject.h"

namespace cocos2d {

typedef struct _ccArray 
{
	unsigned int num, max;
	NSObject**    arr; //equals NSObject** arr;
} ccArray;

/** Allocates and initializes a new array with specified capacity */
static inline ccArray* ccArrayNew(unsigned int capacity) 
{
	if (capacity == 0)
	{
		capacity = 1; 
	}
	
	ccArray *arr = (ccArray*)malloc( sizeof(ccArray) );
	arr->num = 0;
	
	arr->arr =  (NSObject**)malloc( capacity * sizeof(NSObject*) );
	arr->max = capacity;
	
	return arr;
}

static inline void ccArrayRemoveAllObjects(ccArray *arr);

/** Frees array after removing all remaining objects. Silently ignores nil arr. */
static inline void ccArrayFree(ccArray *arr)
{
	if( arr == NULL ) 
	{
		return;
	}
	
	ccArrayRemoveAllObjects(arr);
	
	//delete arr->m_pObjectArray; 
	free(arr->arr);
	
	free(arr);
}

/** Doubles array capacity */
static inline void ccArrayDoubleCapacity(ccArray *arr)
{
	arr->max *= 2;
	arr->arr = (NSObject**) realloc(arr->arr, arr->max * sizeof(NSObject*));
}

/** Increases array capacity such that max >= num + extra. */
static inline void ccArrayEnsureExtraCapacity(ccArray *arr, unsigned int extra)
{
	while (arr->max < arr->num + extra)
	{
		ccArrayDoubleCapacity(arr); 
	}
}

/** Returns index of first occurence of object, UXNotFound if object not found. */
static inline int ccArrayGetIndexOfObject(ccArray *arr, NSObject* object)
{
	for ( unsigned int i = 0; i < arr->num; i++)
	{
		if (arr->arr[i] == object) 
		{
			return i;
		}
	}

	return -1; 
}

/** Returns a Boolean value that indicates whether object is present in array. */
static inline bool ccArrayContainsObject(ccArray *arr, NSObject* object)
{
	return ccArrayGetIndexOfObject(arr, object) != -1;
}

/** Appends an object. Bahaviour undefined if array doesn't have enough capacity. */
static inline void ccArrayAppendObject(ccArray *arr, NSObject* object)
{
	arr->arr[arr->num] = object; object->retain();
	arr->num++;
}

/** Appends an object. Capacity of arr is increased if needed. */
static inline void ccArrayAppendObjectWithResize(ccArray *arr, NSObject* object)
{
	ccArrayEnsureExtraCapacity(arr, 1);
	ccArrayAppendObject(arr, object);
}

/** Appends objects from plusArr to arr. Behaviour undefined if arr doesn't have
 enough capacity. */
static inline void ccArrayAppendArray(ccArray *arr, ccArray *plusArr)
{
	for( unsigned int i = 0; i < plusArr->num; i++)
	{
		ccArrayAppendObject(arr, plusArr->arr[i]); 
	}
}

/** Appends objects from plusArr to arr. Capacity of arr is increased if needed. */
static inline void ccArrayAppendArrayWithResize(ccArray *arr, ccArray *plusArr)
{
	ccArrayEnsureExtraCapacity(arr, plusArr->num); 
	ccArrayAppendArray(arr, plusArr);
}

/** Removes all objects from arr */
static inline void ccArrayRemoveAllObjects(ccArray *arr)
{
	while(arr->num > 0)
	{
		arr->arr[--arr->num]->release();
	}
}

/** Removes object at specified index and pushes back all subsequent objects.
 Behaviour undefined if index outside [0, num-1]. */
static inline void ccArrayRemoveObjectAtIndex(ccArray *arr, unsigned int index)
{
	arr->arr[index]->release(); 
	
	for( unsigned int last = --arr->num; index < last; index++)
	{
		arr->arr[index] = arr->arr[index + 1]; 
	}
}

/** Removes object at specified index and fills the gap with the last object,
 thereby avoiding the need to push back subsequent objects.
 Behaviour undefined if index outside [0, num-1]. */
static inline void ccArrayFastRemoveObjectAtIndex(ccArray *arr, unsigned int index)
{
	arr->arr[index]->release();

	unsigned int last = --arr->num;
	arr->arr[index] = arr->arr[last];
}

/** Searches for the first occurance of object and removes it. If object is not
 found the function has no effect. */
static inline void ccArrayRemoveObject(ccArray *arr, NSObject* object)
{
	unsigned int index = ccArrayGetIndexOfObject(arr, object);

	if (index != -1)
	{
		ccArrayRemoveObjectAtIndex(arr, index);
	}
}

/** Removes from arr all objects in minusArr. For each object in minusArr, the
 first matching instance in arr will be removed. */
static inline void ccArrayRemoveArray(ccArray *arr, ccArray *minusArr)
{
	for( unsigned int i = 0; i < minusArr->num; i++)
	{
		ccArrayRemoveObject(arr, minusArr->arr[i]);
	}
}

/** Removes from arr all objects in minusArr. For each object in minusArr, all
 matching instances in arr will be removed. */
static inline void ccArrayFullRemoveArray(ccArray *arr, ccArray *minusArr)
{
	unsigned int back = 0;
	
	for( unsigned int i = 0; i < arr->num; i++) 
	{
		if( ccArrayContainsObject(minusArr, arr->arr[i]) ) 
		{
			delete arr->arr[i]; 
			back++;
		}
		else
		{
			arr->arr[i - back] = arr->arr[i];
		}
	}
	
	arr->num -= back;
}

typedef struct _ccCArray 
{
	unsigned int num, max;
	void**    arr; //equals NSObject** arr;
} ccCArray;

static inline void ccCArrayRemoveAllValues(ccCArray *arr);

/** Allocates and initializes a new C array with specified capacity */
static inline ccCArray* ccCArrayNew(unsigned int capacity) 
{
	if (capacity == 0)
	{
		capacity = 1; 
	}
	
	ccCArray *arr = (ccCArray*)malloc( sizeof(ccCArray) );
	arr->num = 0;
	arr->arr =  (void**) malloc( capacity * sizeof(void*) );
	arr->max = capacity;
	
	return arr;
}

/** Frees C array after removing all remaining values. Silently ignores nil arr. */
static inline void ccCArrayFree(ccCArray *arr)
{
	if( arr == NULL ) 
	{
		return;
	}
	
	ccCArrayRemoveAllValues(arr);
	
	free(arr->arr);
	free(arr);
}

/** Doubles C array capacity */
static inline void ccCArrayDoubleCapacity(ccCArray *arr)
{
	arr->max *= 2;
	arr->arr = (void**) realloc(arr->arr, arr->max * sizeof(void*));
}

/** Increases array capacity such that max >= num + extra. */
static inline void ccCArrayEnsureExtraCapacity(ccCArray *arr, unsigned int extra)
{
	while (arr->max < arr->num + extra)
	{
		ccCArrayDoubleCapacity(arr); 
	}
}

/** Returns index of first occurence of value, NSNotFound if value not found. */
static inline int ccCArrayGetIndexOfValue(ccCArray *arr, void* value)
{
	for (unsigned int i = 0; i < arr->num; i++)
	{
		if (arr->arr[i] == value) 
		{
			return i;
		}
	}

	return -1;
}

/** Returns a Boolean value that indicates whether value is present in the C array. */
static inline bool ccCArrayContainsValue(ccCArray *arr, void* value)
{
	return ccCArrayGetIndexOfValue(arr, value) != -1;
}

/** Inserts a value at a certain position. The valid index is [0, num] */
static inline void ccCArrayInsertValueAtIndex( ccCArray *arr, void* value, unsigned int index)
{
	int remaining = arr->num - index;

	// make sure it has enough capacity
	if (arr->num + 1 == arr->max)
	{
        ccCArrayDoubleCapacity(arr);
	}
	
	// last Value doesn't need to be moved
	if( remaining > 0) 
	{
		// tex coordinates
		memmove( &arr->arr[index+1],&arr->arr[index], sizeof(void*) * remaining );
	}
	
	arr->num++;	
	arr->arr[index] = value;
}

/** Appends an value */
static inline void ccCArrayAppendValue(ccCArray *arr, void* value)
{
	arr->arr[arr->num] =  value;
	arr->num++;

	// double the capacity for the next append action
	// if the num >= max
	if (arr->num >= arr->max)
	{
		ccCArrayDoubleCapacity(arr);
	}
}

/** Appends an value. Capacity of arr is increased if needed. */
static inline void ccCArrayAppendValueWithResize(ccCArray *arr, void* value)
{
	ccCArrayEnsureExtraCapacity(arr, 1);
	ccCArrayAppendValue(arr, value);
}

/** Appends values from plusArr to arr. Behaviour undefined if arr doesn't have
 enough capacity. */
static inline void ccCArrayAppendArray(ccCArray *arr, ccCArray *plusArr)
{
	for (unsigned int i = 0; i < plusArr->num; i++)
	{
		ccCArrayAppendValue(arr, plusArr->arr[i]);
	}
}

/** Appends values from plusArr to arr. Capacity of arr is increased if needed. */
static inline void ccCArrayAppendArrayWithResize(ccCArray *arr, ccCArray *plusArr)
{
	ccCArrayEnsureExtraCapacity(arr, plusArr->num);
	ccCArrayAppendArray(arr, plusArr);
}

/** Removes all values from arr */
static inline void ccCArrayRemoveAllValues(ccCArray *arr)
{
	arr->num = 0;
}

/** Removes value at specified index and pushes back all subsequent values.
 Behaviour undefined if index outside [0, num-1]. */
static inline void ccCArrayRemoveValueAtIndex(ccCArray *arr, unsigned int index)
{	
	for (unsigned int last = --arr->num; index < last; index++)
	{
		arr->arr[index] = arr->arr[index + 1];
	}
}

/** Removes value at specified index and fills the gap with the last value,
 thereby avoiding the need to push back subsequent values.
 Behaviour undefined if index outside [0, num-1]. */
static inline void ccCArrayFastRemoveValueAtIndex(ccCArray *arr, unsigned int index)
{
	unsigned int last = --arr->num;
	arr->arr[index] = arr->arr[last];
}

/** Searches for the first occurance of value and removes it. If value is not
 found the function has no effect. */
static inline void ccCArrayRemoveValue(ccCArray *arr, void* value)
{
	unsigned int index = ccCArrayGetIndexOfValue(arr, value);
	if (index != -1)
	{
		ccCArrayRemoveValueAtIndex(arr, index);
	}
}

/** Removes from arr all values in minusArr. For each Value in minusArr, the
 first matching instance in arr will be removed. */
static inline void ccCArrayRemoveArray(ccCArray *arr, ccCArray *minusArr)
{
	for( unsigned int i = 0; i < minusArr->num; i++)
	{
		ccCArrayRemoveValue(arr, minusArr->arr[i]);
	}
}

/** Removes from arr all values in minusArr. For each value in minusArr, all
 matching instances in arr will be removed. */
static inline void ccCArrayFullRemoveArray(ccCArray *arr, ccCArray *minusArr)
{
	unsigned int back = 0;
	
	for (unsigned int i = 0; i < arr->num; i++) 
	{
		if( ccCArrayContainsValue(minusArr, arr->arr[i]) ) 
		{
			back++;
		} else
		{
			arr->arr[i - back] = arr->arr[i];
		}
	}
	
	arr->num -= back;
} 

}

#endif // CC_ARRAY_H