#include <iostream.h>
#include <stdio.h>
#include "ItemInterface.h"
#include "ListInterface.h"

DLnkNodePtr FreeList=NULL;

/**********************************************************************
 *
 *  Function:	SetNextLink
 *  Input:		DLnkNodePtr New -- the node to change
 *				DLnkNodePtr Curr -- The node to point to
 *
 *  Returns:    void
 *
 *  Description:
 *	This function sets the next link on the first node passed to 
 *	point to the second node
 *
 *  Variables:	none
 *
 *  Called by:	Insert
 *				Remove
 *
 *  Calls:      none
 *
 *  Author:		N.D. Barnette? / Tim McGaughey
 *  Revisions:	none
 *  Version:	1.0
 *
 *
 **********************************************************************/

void SetNextLink(DLnkNodePtr New, DLnkNodePtr Curr)
{
	New->Link=Curr;
}

/**********************************************************************
 *
 *  Function:	SetPrevLink
 *  Input:		DLnkNodePtr New -- the node to change
 *				DLnkNodePtr Curr -- The node to point to
 *
 *  Returns:    void
 *
 *  Description:
 *	This function sets the previous link on the first node passed to 
 *	point to the second node
 *
 *  Variables:	none
 *
 *  Called by:	Insert
 *				Remove
 *
 *  Calls:      none
 *
 *  Author:		N.D. Barnette? / Tim McGaughey
 *  Revisions:	none
 *  Version:	1.0
 *
 *
 **********************************************************************/

void SetPrevLink(DLnkNodePtr New, DLnkNodePtr Prev)
{
	New->PrevLink=Prev;
}

/**********************************************************************
 *
 *  Function:	GetNextLink
 *  Input:		DLnkNodePtr Curr -- The node to return the pointer of
 *
 *  Returns:    DLnkNodePtr
 *
 *  Description:
 *	This function returns the next link on the node passed. 
 *
 *  Variables:	none
 *
 *  Called by:	none - to be implemented in insert and remove
 *
 *  Calls:      none
 *
 *  Author:		N.D. Barnette? / Tim McGaughey
 *  Revisions:	Modified in the event that Curr was NULL.
 *  Version:	2.0
 *
 *
 **********************************************************************/

DLnkNodePtr GetNextLink(DLnkNodePtr Curr)
{
	if (Curr!=NULL)
		return (Curr->Link);
	return NULL;
}

/**********************************************************************
 *
 *  Function:	GetPrevLink
 *  Input:		DLnkNodePtr Curr -- The node to return the pointer of
 *
 *  Returns:    DLnkNodePtr
 *
 *  Description:
 *	This function returns the previous link on the node passed. 
 *
 *  Variables:	none
 *
 *  Called by:	none - to be implemented in insert and remove
 *
 *  Calls:      none
 *
 *  Author:		N.D. Barnette? / Tim McGaughey
 *  Revisions:	protection from a null value being passed.
 *  Version:	2.0
 *
 *
 **********************************************************************/

DLnkNodePtr GetPrevLink(DLnkNodePtr Curr)
{
	if (Curr!=NULL)
		return (Curr->PrevLink);
	return NULL;
}

/**********************************************************************
 *
 *  Function:	SetItem
 *  Input:		DLnkNodePtr Curr -- The node to return the pointer of
 *				MovieNode InfoItem -- The item to insert into the node
 *
 *  Returns:    void
 *
 *  Description:
 *	This function sets information in the node
 *
 *  Variables:	none
 *
 *  Called by:	Insert
 *				Remove
 *
 *  Calls:      AssignItem
 *
 *  Author:		N.D. Barnette? / Tim McGaughey
 *  Revisions:	none
 *  Version:	1.0
 *
 *
 **********************************************************************/

void SetItem (DLnkNodePtr Curr, MovieNode InfoItem)
{
	AssignItem(Curr, InfoItem);
}

/**********************************************************************
 *
 *  Function:	GetItem
 *  Input:		DLnkNodePtr Curr -- The node to pull the item from
 *
 *  Returns:    MovieNode
 *
 *  Description:
 *	This function gets the item from the node 
 *
 *  Variables:	none
 *
 *  Called by:	Insert
 *
 *  Calls:      none
 *
 *  Author:		N.D. Barnette? / Tim McGaughey
 *  Revisions:	none
 *  Version:	1.0
 *
 *
 **********************************************************************/

MovieNode GetItem(DLnkNodePtr Curr)
{
	return (Curr->Item);
}

/**********************************************************************
 *
 *  Function:	AllocateNewNode
 *  Input:		DLnkNodePtr& New -- a pointer to the new node
 *
 *  Returns:    void
 *
 *  Description:
 *	This function gets a new node from the heap or the free list
 *
 *  Variables:	none
 *
 *  Called by:	Insert
 *				Remove
 *
 *  Calls:      none
 *
 *  Author:		N.D. Barnette? / Tim McGaughey
 *  Revisions:	none
 *  Version:	1.0
 *
 *
 **********************************************************************/

void AllocateNewNode (DLnkNodePtr & New)
{

	if (FreeList!=NULL)
	{
		New=FreeList;
		FreeList=FreeList->Link;
		New->Link=NULL;
		New->PrevLink=NULL;
	}
	
	else
	{
		New=new DLnkNode;
	}
}

/**********************************************************************
 *
 *  Function:	FreeNode
 *  Input:		DLnkNodePtr Curr -- The node to put into the Free List
 *
 *  Returns:    void
 *
 *  Description:
 *	This function performs a mock deletion to limit heap access
 *
 *  Variables:	none
 *
 *  Called by:	Insert
 *				Remove
 *				BinarySearch
 *
 *  Calls:      none
 *
 *  Author:		N.D. Barnette? / Tim McGaughey
 *  Revisions:	none
 *  Version:	1.0
 *
 *
 **********************************************************************/

void FreeNode (DLnkNodePtr & Curr)
{
	Curr->Link=FreeList;
	//new to clean up junk so no problems later
	Curr->Item.filetype=NULL;
	strcpy(Curr->Item.title, "");
	Curr->Item.movieindex=0;
	strcpy(Curr->Item.filename,"");
	Curr->Item.verified=FALSE;
	//continuation of old stuff
	FreeList=Curr;
	Curr=NULL;
}

/**********************************************************************
 *
 *  Function:	InitilizationForLists
 *  Input:		DLnkNodePtr Curr -- The node to return the pointer of
 *				MovieNode InfoItem -- The item to insert into the node
 *
 *  Returns:    void
 *
 *  Description:
 *	This function initializes lists, but is not currently needed.
 *
 *  Variables:	none
 *
 *  Called by:	none - should be done at start
 *
 *  Calls:      none
 *
 *  Author:		N.D. Barnette? / Tim McGaughey
 *  Revisions:	none
 *  Version:	1.0
 *
 *
 **********************************************************************/

void InitializationForLists(void)
{
	FreeList=NULL;
}