/**

 * 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)

		{

		}

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

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

	};

	/**

	 * @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			-1		/**< 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_