/*****************************************************************************
The Dark Mod GPL Source Code

This file is part of the The Dark Mod Source Code, originally based
on the Doom 3 GPL Source Code as published in 2011.

The Dark Mod Source Code is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version. For details, see LICENSE.TXT.

Project: The Dark Mod (http://www.thedarkmod.com/)

******************************************************************************/
#ifndef __DARKMOD_INVENTORYCURSOR_H__
#define __DARKMOD_INVENTORYCURSOR_H__

#include "Category.h"

class CInventoryCursor
{
public:
	/**
	 * greebo: Construct this cursor with a pointer to the parent inventory and its ID.
	 */
	CInventoryCursor(CInventory* inventory, int id);

	void					Save( idSaveGame *savefile ) const;
	void					Restore( idRestoreGame *savefile );

	inline CInventory*		Inventory() { return m_Inventory; };
	/**
	 * Retrieve the currently selected item.
	 */
	CInventoryItemPtr		GetCurrentItem();
	bool					SetCurrentItem(CInventoryItemPtr item);
	bool					SetCurrentItem(const idStr& itemName);

	/**
	 * greebo: Clears the cursor. After calling this, the cursor is pointing
	 *         at nothing. The category lock and other settings are not affected by this call.
	 * stifu #2993: This changes the cursor to the default category and dummy item to make
	 * 	       sure the item index is always valid
	 */
	void					ClearItem();

	/**
	 * Get the next/prev item in the inventory. Which item is actually returned, 
	 * depends on the settings of CategoryLock and WrapAround.
	 */
	CInventoryItemPtr		GetNextItem();
	CInventoryItemPtr		GetPrevItem();

	CInventoryCategoryPtr	GetNextCategory();
	CInventoryCategoryPtr	GetPrevCategory();
	
	/**
	 * Set the current group index.
	 */
	void					SetCurrentCategory(int index);
	void					SetCurrentCategory(const idStr& categoryName);

	/**
	 * greebo: Returns the category of the focused item or NULL if no inventory is attached.
	 */
	CInventoryCategoryPtr	GetCurrentCategory() const;

	/**
	 * Set the current item index.
	 * Validation of the index is done when doing Nex/Prev Category
	 * so we don't really care whether this is a valid index or not.
	 * STiFU #2993: Add validation after all to make sure the index is always valid
	 */
	void					SetCurrentItem(int index);

	void					Validate();

	/**
	 * Returns the current index within the category of the item pointed at.
	 */
	int						GetCurrentItemIndex() const { return m_CurrentItem; }

	/**
	 * greebo: Returns TRUE if the item pointed at is the the last item in this category.
	 * Note that the "wraparund" setting doesn't affect this method.
	 */
	bool					IsLastItemInCategory() const;

	void					SetCategoryLock(bool bLock) { m_CategoryLock = bLock; }
	void					SetWrapAround(bool bWrap) { m_WrapAround = bWrap; }

	void					RemoveCategoryIgnored(const CInventoryCategoryPtr& category);
	void					RemoveCategoryIgnored(const idStr& categoryName);

	void					AddCategoryIgnored(const CInventoryCategoryPtr& category);
	void					AddCategoryIgnored(const idStr& categoryName);

	// Returns the unique ID of this cursor
	int						GetId() const;

protected:
	bool					IsCategoryIgnored(const CInventoryCategoryPtr& category) const;

protected:

	// The inventory we're associated with
	CInventory* m_Inventory;

	/**
	 * List of category indices that should be ignored for this cursor.
	 * The resulting behaviour is that the cursor will cycle through
	 * items and categories, as if the categories in this list didn't exist.
	 */
	idList<int> m_CategoryIgnore;

	/**
	 * If true it means that the scrolling with next/prev is locked
	 * to the current group when a warparound occurs. In this case 
	 * the player has to use the next/prev group keys to switch to
	 * a different group.
	 */
	bool m_CategoryLock;

	/**
	 * If set to true the inventory will start from the first/last item
	 * if it is scrolled beyond the last/first item. Depending on the
	 * CategoryLock setting, this may mean that, when the last item is reached
	 * and CategoryLock is false, NextItem will yield the first item of
	 * the first group, and vice versa in the other direction. This would be
	 * the behaviour like the original Thief games inventory.
	 * If CategoryLock is true and WrapAround is true it will also go to the first
	 * item, but stays in the same group.
	 * If WrapAround is false and the last/first item is reached, Next/PrevItem
	 * will always return the same item on each call;
	 */
	bool m_WrapAround;

	/**
	 * CurrentCategory is the index of the current group for using Next/PrevItem
	 */
	int m_CurrentCategory;

	/**
	 * CurrentItem is the index of the current item in the current group for
	 * using Next/PrevItem.
	 */
	int m_CurrentItem;

	// The unique ID of this cursor
	int m_CursorId;
};
typedef std::shared_ptr<CInventoryCursor> CInventoryCursorPtr;

#endif /* __DARKMOD_INVENTORYCURSOR_H__ */