/**

  * vim: set ts=4 :

  * ===============================================================

  * SourceMod, Copyright (C) 2004-2007 AlliedModders LLC. 

  * All rights reserved.

  * ===============================================================

  *

  *  This file is part of the SourceMod/SourcePawn SDK.  This file may only be 

  * used or modified under the Terms and Conditions of its License Agreement, 

  * which is found in public/licenses/LICENSE.txt.  As of this notice, derivative 

  * works must be licensed under the GNU General Public License (version 2 or 

  * greater).  A copy of the GPL is included under public/licenses/GPL.txt.

  * 

  * To view the latest information, see: http://www.sourcemod.net/license.php

  *

  * Version: $Id$

  */

 #ifndef _INCLUDE_SOURCEMOD_MENU_SYSTEM_H_

 #define _INCLUDE_SOURCEMOD_MENU_SYSTEM_H_

 #include <IShareSys.h>

 #define SMINTERFACE_MENUMANAGER_NAME		"IMenuManager"

 #define SMINTERFACE_MENUMANAGER_VERSION		1

 /**

  * @file IMenuManager.h

  * @brief Abstracts on-screen menus for clients.

  */

 namespace SourceMod

 {

 	/**

 	 * @brief Used to determine how an item selection is interpreted.

 	 */

 	enum ItemSelection

 	{

 		ItemSel_None,					/**< Invalid selection */

 		ItemSel_Back,					/**< Go back one page */

 		ItemSel_Next,					/**< Go forward one page */

 		ItemSel_Exit,					/**< Menu was exited */

 		ItemSel_Item,					/**< Valid item selection */

 	};

 	/**

 	 * @brief Used to determine which order to search for items in.

 	 */

 	enum ItemOrder

 	{

 		ItemOrder_Ascending,			/**< Items should be drawn ascendingly */

 		ItemOrder_Descending,			/**< Items should be drawn descendingly */

 	};

 	/**

 	 * @brief Pairs an item type with an item menu position.

 	 */

 	struct menu_slots_t

 	{

 		ItemSelection type;				/**< Item selection type */

 		unsigned int item;				/**< Item position, if applicable */

 	};

 	class IBaseMenu;

 	class IMenuDisplay;

 	class IMenuHandler;

 	/**

 	 * @brief Describes menu display information.

 	 */

 	struct menu_states_t

 	{

 		unsigned int apiVers;			/**< Must be filled with the API version */

 		IBaseMenu *menu;				/**< Menu pointer, or NULL if there is only a display */

 		IMenuHandler *mh;				/**< Menu callbacks handler */

 		unsigned int firstItem;			/**< MENU ONLY: First item displayed on the last page */

 		unsigned int lastItem;			/**< MENU ONLY: Last item displayed on the last page */

 		menu_slots_t slots[11];			/**< MENU ONLY: Item selection table (first index is 1) */

 	};

 	#define ITEMDRAW_DEFAULT		(0)		/**< Item should be drawn normally */

 	#define ITEMDRAW_DISABLED		(1<<0)	/**< Item is drawn but not selectable */

 	#define ITEMDRAW_RAWLINE		(1<<1)	/**< Item should be a raw line, without a slot */

 	#define ITEMDRAW_NOTEXT			(1<<2)	/**< No text should be drawn */

 	#define ITEMDRAW_SPACER			(1<<3)	/**< Item should be drawn as a spacer, if possible */

 	#define ITEMDRAW_IGNORE	((1<<1)|(1<<2))	/**< Item should be completely ignored (rawline + notext) */

 	/**

 	 * @brief Information about item drawing.

 	 */

 	struct ItemDrawInfo

 	{

 		ItemDrawInfo()

 		{

 			style = 0;

 			display = NULL;

 		}

 		ItemDrawInfo(const char *DISPLAY, unsigned int STYLE=ITEMDRAW_DEFAULT) 

 			: display(DISPLAY), style(STYLE)

 		{

 		}

 		const char *display;			/**< Display text (NULL for none) */

 		unsigned int style;				/**< ITEMDRAW style flags */

 	};

 	/**

 	 * @brief Reasons for a menu dying.

 	 */

 	enum MenuCancelReason

 	{

 		MenuCancel_Disconnect = -1,	/** Client dropped from the server */

 		MenuCancel_Interrupt = -2,	/** Client was interrupted with another menu */

 		MenuCancel_Exit = -3,		/** Client selected "exit" on a paginated menu */

 		MenuCancel_NoDisplay = -4,	/** Menu could not be displayed to the client */

 	};

 	#define MENU_NO_PAGINATION			0		/**< Menu should not be paginated (10 items max) */

 	#define MENU_TIME_FOREVER			0		/**< Menu should be displayed as long as possible */

 	/**

 	 * @brief Extended menu options.

 	 */

 	enum MenuOption

 	{

 		MenuOption_IntroMessage,				/**< CONST CHAR *: Valve menus only; defaults to:

 													 "You have a menu, hit ESC"

 													 */

 		MenuOption_IntroColor,					/**< INT[4]: Valve menus only; specifies the intro message colour

 													 using R,G,B,A (defaults to 255,0,0,255)

 													 */

 		MenuOption_Priority,					/**< INT *: Valve menus only; priority (less is higher) */

 	};

 	/**

 	 * @brief Describes the menu a player is viewing.

 	 */

 	enum MenuSource

 	{

 		MenuSource_None = 0,					/**< No menu is being displayed */

 		MenuSource_External = 1,				/**< External menu, no pointer */

 		MenuSource_BaseMenu = 2,				/**< An IBaseMenu pointer. */

 		MenuSource_Display = 3,					/**< IMenuDisplay source, no pointer */

 	};

 	class IMenuStyle;

 	/**

 	 * @brief Sets how a raw menu should be drawn.

 	 */

 	class IMenuDisplay

 	{

 	public:

 		/**

 		 * @brief Returns the parent IMenuStyle pointer.

 		 *

 		 * @return				IMenuStyle pointer which created

 		 *						this object.

 		 */

 		virtual IMenuStyle *GetParentStyle() =0;

 		/**

 		 * @brief Resets/clears the cached display text.

 		 */

 		virtual void Reset() =0;

 		/**

 		 * @brief Sets how the title should be drawn.

 		 *

 		 * @param text			Text string to display for the title.

 		 * @param onlyIfEmpty	Only sets the title if one does not already 

 		 *						exist.

 		 */

 		virtual void DrawTitle(const char *text, bool onlyIfEmpty=false) =0;

 		/**

 		 * @brief Adds an item to the menu and returns the position (1-10).

 		 *

 		 * Note: Item will fail to draw if there are too many items,

 		 * or the item is not drawable (for example, invisible).	

 		 * 

 		 * @return				Item draw position, or 0 on failure.

 		 */

 		virtual unsigned int DrawItem(const ItemDrawInfo &item) =0;

 		/**

 		 * @brief Draws a raw line of text, if supported.  The line does not 

 		 * need to be newline terminated.

 		 *

 		 * @return				True on success, false if not supported.

 		 */

 		virtual bool DrawRawLine(const char *rawline) =0;

 		/**

 		 * @brief Sets an extended menu option.

 		 *

 		 * @param option		Option type.

 		 * @param valuePtr		Pointer of the type expected by the option.

 		 * @return				True on success, false if option or value is not supported.

 		 */

 		virtual bool SetExtOption(MenuOption option, const void *valuePtr) =0;

 		/**

 		 * @brief Returns whether the display is capable of rendering an item

 		 * with the given flags.

 		 *

 		 * @param flags			ITEMDRAW flags.

 		 * @return				True if renderable, false otherwise.

 		 */

 		virtual bool CanDrawItem(unsigned int drawFlags) =0;

 		/**

 		 * @brief Sends the menu display to a client.

 		 *

 		 * @param client		Client index to display to.

 		 * @param handler		Menu handler to use.

 		 * @param time			Time to hold menu for.

 		 * @return				True on success, false otherwise.

 		 */

 		virtual bool SendDisplay(int client, IMenuHandler *handler, unsigned int time) =0;

 		/**

 		 * @brief Destroys the display object.

 		 */

 		virtual void DeleteThis() =0;

 	};

 	/**

 	 * @brief Describes a "MenuStyle" system which manages

 	 * menu drawing and construction.

 	 */

 	class IMenuStyle

 	{

 	public:

 		/**

 		 * @brief Returns the style API version.

 		 *

 		 * @return				API version.

 		 */

 		virtual unsigned int GetStyleAPIVersion()

 		{

 			return SMINTERFACE_MENUMANAGER_VERSION;

 		}

 		/**

 		 * @brief Returns the name of the menu style.

 		 *

 		 * @return				String containing the style name.

 		 */

 		virtual const char *GetStyleName() =0;

 		/**

 		 * @brief Creates an IMenuDisplay object.

 		 *

 		 * Note: the object should be freed using ::DeleteThis.

 		 *

 		 * @return				IMenuDisplay object.

 		 */

 		virtual IMenuDisplay *CreateDisplay() =0;

 		/**

 		 * @brief Creates an IBaseMenu object of this style.

 		 *

 		 * Note: the object should be freed using IBaseMenu::Destroy.

 		 *

 		 * @return				An IBaseMenu pointer.

 		 */

 		virtual IBaseMenu *CreateMenu() =0;

 		/**

 		 * @brief Returns the maximum number of items per page.

 		 *

 		 * @return				Number of items per page.

 		 */

 		virtual unsigned int GetMaxPageItems() =0;

 		/**

 		 * @brief Returns whether or not a client is viewing a menu.

 		 *

 		 * @param client		Client index.

 		 * @param object		Optional pointer to retrieve menu object,

 		 *						if any.

 		 * @return				MenuSource value.

 		 */

 		virtual MenuSource GetClientMenu(int client, void **object) =0;

 		/**

 		 * @brief Cancels a client's menu.

 		 *

 		 * @param client		Client index.

 		 * @param autoIgnore	If true, no menus can be created during 

 		 *						the cancellation process.

 		 * @return				True if a menu was cancelled, false otherwise.

 		 */

 		virtual bool CancelClientMenu(int client, bool autoIgnore=false) =0;

 	};

 	/**

 	 * @brief High-level interface for building menus.

 	 */

 	class IBaseMenu

 	{

 	public:

 		/**

 		 * @brief Appends an item to the end of a menu.

 		 *

 		 * @param info			Item information string.

 		 * @param draw			Default drawing information.

 		 * @return				True on success, false on item limit reached.

 		 */

 		virtual bool AppendItem(const char *info, const ItemDrawInfo &draw) =0;

 		/**

 		 * @brief Inserts an item into the menu before a certain position; 

 		 * the new item will be at the given position and all next items 

 		 * pushed forward.

 		 *

 		 * @param position		Position, starting from 0.

 		 * @param info			Item information string.

 		 * @param draw			Default item draw info.

 		 * @return				True on success, false on invalid menu position

 		 */

 		virtual bool InsertItem(unsigned int position, const char *info, const ItemDrawInfo &draw) =0;

 		/**

 		 * @brief Removes an item from the menu.

 		 *

 		 * @param position		Position, starting from 0.

 		 * @return				True on success, false on invalid menu position.

 		 */

 		virtual bool RemoveItem(unsigned int position) =0;

 		/**

 		 * @brief Removes all items from the menu.

 		 */

 		virtual void RemoveAllItems() =0;

 		/**

 		 * @brief Returns an item's info.

 		 *

 		 * @param position		Position, starting from 0.

 		 * @param draw			Optional pointer to store a draw information.

 		 * @return				Info string pointer, or NULL if position was invalid.

 		 */

 		virtual const char *GetItemInfo(unsigned int position, ItemDrawInfo *draw) =0;

 		/**

 		 * @brief Returns the number of items.

 		 *

 		 * @return				Number of items in the menu.

 		 */

 		virtual unsigned int GetItemCount() =0;

 		/** 

 		 * @brief Sets the menu's pagination,.

 		 *

 		 * @param itemsPerPage	Number of items per page, or MENU_NO_PAGINATION.

 		 * @return				True on success, false if itemsPerPage is too large.

 		 */

 		virtual bool SetPagination(unsigned int itemsPerPage) =0;

 		/**

 		 * @brief Returns an item's pagination.

 		 *

 		 * @return				Pagination setting.

 		 */

 		virtual unsigned int GetPagination() =0;

 		/**

 		 * @brief Returns the menu style.

 		 * 

 		 * @return				Menu style.

 		 */

 		virtual IMenuStyle *GetDrawStyle() =0;

 		/**

 		 * @brief Sets the menu's display title/message.

 		 *

 		 * @param message		Message (format options allowed).

 		 */

 		virtual void SetDefaultTitle(const char *message) =0;

 		/**

 		 * @brief Returns the menu's display/title message.

 		 *

 		 * @return				Message string.

 		 */

 		virtual const char *GetDefaultTitle() =0;

 		/**

 		 * @brief Sets an extended menu option.

 		 *

 		 * @param option		Option type.

 		 * @param valuePtr		Pointer of the type expected by the option.

 		 * @return				True on success, false if option or value is not supported.

 		 */

 		virtual bool SetExtOption(MenuOption option, const void *valuePtr) =0;

 		/**

 		 * @brief Creates a new IMenuDisplay object using extended options specific

 		 * to the IMenuStyle parent.  Titles, items, etc, are not copied.

 		 *

 		 * Note: The object should be freed with IMenuDisplay::DeleteThis.

 		 *

 		 * @return				IMenuDisplay pointer.

 		 */

 		virtual IMenuDisplay *CreateDisplay() =0;

 		/**

 		 * @brief Returns whether or not the menu should have an "Exit" button for

 		 * paginated menus.

 		 *

 		 * @return				True to have an exit button, false otherwise.

 		 */

 		virtual bool GetExitButton() =0;

 		/**

 		 * @brief Sets whether or not the menu should have an "Exit" button for

 		 * paginated menus.

 		 *

 		 * @param set			True to enable, false to disable the exit button.

 		 * @return				True on success, false if the exit button is 

 		 *						non-optional.

 		 */

 		virtual bool SetExitButton(bool set) =0;

 		/**

 		 * @brief Sends the menu to a client.

 		 *

 		 * @param client		Client index to display to.

 		 * @param handler		Menu handler to use.

 		 * @param time			Time to hold menu for.

 		 * @return				True on success, false otherwise.

 		 */

 		virtual bool Display(int client, IMenuHandler *handler, unsigned int time) =0;

 		/**

 		 * @brief Destroys the menu and frees all associated resources.1

 		 */

 		virtual void Destroy() =0;

 		/**

 		 * @brief Cancels the menu on all client's displays.  While the menu is

 		 * being cancelled, the menu may not be re-displayed to any clients.

 		 *

 		 * @return				Number of menus cancelled.

 		 */

 		virtual void Cancel() =0;

 	};

 	/** 

 	 * @brief Contains callbacks for menu actions.

 	 */

 	class IMenuHandler

 	{

 	public:

 		/**

 		 * @brief Returns the menu api verison.

 		 *

 		 * @return				Menu API version.

 		 */

 		virtual unsigned int GetMenuAPIVersion2()

 		{

 			return SMINTERFACE_MENUMANAGER_VERSION;

 		}

 		/** 

 		 * @brief A display/selection cycle has started.

 		 *

 		 * @param menu			Menu pointer.

 		 */

 		virtual void OnMenuStart(IBaseMenu *menu)

 		{

 		}

 		/**

 		 * @brief Called before a menu is being displayed.  This is where

 		 * you can set an alternate title on the menu.

 		 *

 		 * @param menu			Menu pointer.

 		 * @param client		Client index.

 		 * @param display		IMenuDisplay pointer.

 		 */

 		virtual void OnMenuDisplay(IBaseMenu *menu, int client, IMenuDisplay *display)

 		{

 		}

 		/**

 		 * @brief Called when an item is selected.

 		 *

 		 * @param menu			Menu pointer.

 		 * @param client		Client that selected the item.

 		 * @param item			Item number.

 		 */

 		virtual void OnMenuSelect(IBaseMenu *menu, int client, unsigned int item)

 		{

 		}

 		/**

 		 * @brief An active menu display was dropped from a client.

 		 *

 		 * @param menu			Menu pointer.

 		 * @param client		Client that had the menu.

 		 * @param reason		Menu cancellation reason.

 		 */

 		virtual void OnMenuCancel(IBaseMenu *menu, int client, MenuCancelReason reason)

 		{

 		}

 		/**

 		 * @brief A display/selection cycle has ended.

 		 *

 		 * @param menu			Menu pointer.

 		 */

 		virtual void OnMenuEnd(IBaseMenu *menu)

 		{

 		}

 		/**

 		 * @brief Called when requesting how to render an item.

 		 *

 		 * @param menu			Menu pointer.

 		 * @param client		Client index receiving the menu.

 		 * @param item			Item number in the menu.

 		 * @param style			ITEMSTYLE flags, by reference for modification.

 		 */

 		virtual void OnMenuDrawItem(IBaseMenu *menu, int client, unsigned int item, unsigned int &style)

 		{

 		}

 		/**

 		 * @brief Called when requesting how to draw an item's text.

 		 *

 		 * @param menu			Menu pointer.

 		 * @param client		Client index receiving the menu.

 		 * @param item			Item number in the menu.

 		 * @param display		Pointer to the display text string (changeable).

 		 */

 		virtual void OnMenuDisplayItem(IBaseMenu *menu, int client, unsigned int item, const char **display)

 		{

 		}

 	};

 	/** 

 	 * @brief Handles a vote menu.

 	 */

 	class IMenuVoteHandler : public IMenuHandler

 	{

 	public:

 		/**

 		 * @brief Called when a vote ends.

 		 *

 		 * @param menu			Menu pointer.

 		 * @param item			Item position that was chosen by a majority.

 		 */

 		virtual void OnMenuVoteEnd(IBaseMenu *menu, unsigned int item) =0;

 	};

 	/**

 	 * @brief Manages menu creation and displaying.

 	 */

 	class IMenuManager : public SMInterface

 	{

 	public:

 		virtual const char *GetInterfaceName()

 		{

 			return SMINTERFACE_MENUMANAGER_NAME;

 		}

 		virtual unsigned int GetInterfaceVersion()

 		{

 			return SMINTERFACE_MENUMANAGER_VERSION;

 		}

 	public:

 		/**

 		 * @brief Finds a style by name.

 		 *

 		 * @param name			Name of the style (case insensitive).

 		 * @return				IMenuStyle pointer, or NULL if not found.

 		 */

 		virtual IMenuStyle *FindStyleByName(const char *name) =0;

 		/**

 		 * @brief Broadcasts a menu to a number of clients.

 		 *

 		 * @param menu			Menu pointer.

 		 * @param handler		IMenuHandler pointer.

 		 * @param clients		Array of client indexes.

 		 * @param numClients	Number of clients in the array.

 		 * @param time			Time to hold the menu.

 		 * @return				Number of clients the menu will be waiting on.

 		 */

 		virtual unsigned int BroadcastMenu(IBaseMenu *menu, 

 									IMenuHandler *handler,

 									int clients[], 

 									unsigned int numClients,

 									unsigned int time) =0;

 		/**

 		 * @brief Broadcasts a menu to a number of clients as a vote menu.

 		 *

 		 * @param menu			Menu pointer.

 		 * @param handler		IMenuHandler pointer.

 		 * @param clients		Array of client indexes.

 		 * @param numClients	Number of clients in the array.

 		 * @param time			Time to hold the menu.

 		 * @return				Number of clients the menu will be waiting on.

 		 */

 		virtual unsigned int VoteMenu(IBaseMenu *menu, 

 									IMenuVoteHandler *handler,

 									int clients[], 

 									unsigned int numClients,

 									unsigned int time) =0;

 		/**

 		 * @brief Returns the default draw style Core is using.

 		 *

 		 * @return				Menu style pointer.

 		 */

 		virtual IMenuStyle *GetDefaultStyle() =0;

 		/** 

 		 * @brief Sets the default draw style Core uses.

 		 *

 		 * @param style			Menu style.

 		 * @return				True on success, false on failure.

 		 */

 		virtual bool SetDefaultStyle(IMenuStyle *style) =0;

 		/**

 		 * @brief Given a set of menu states, converts it to an IDisplay object.

 		 *

 		 * The state parameter is both INPUT and OUTPUT.

 		 * INPUT: menu, mh, firstItem, lastItem

 		 * OUTPUT: display, firstItem, lastItem, slots

 		 *

 		 * @param client		Client index.

 		 * @param states		Menu states.

 		 * @return				IDisplay pointer, or NULL if no items could be 

 		 *						found in the IBaseMenu pointer, or NULL if any

 		 *						other error occurred.  Any valid pointer must

 		 *						be freed using IMenuDisplay::DeleteThis.

 		 */

 		virtual IMenuDisplay *RenderMenu(int client, menu_states_t &states, ItemOrder order) =0;

 	};

 }

 #endif //_INCLUDE_SOURCEMOD_MENU_SYSTEM_H_