/**

 * vim: set ts=4 :

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

 * SourceMod

 * Copyright (C) 2004-2010 AlliedModders LLC.  All rights reserved.

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

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, version 3.0, as published by the

 * Free Software Foundation.

 * 

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more

 * details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to link the

 * code of this program (as well as its derivative works) to "Half-Life 2," the

 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

 * by the Valve Corporation.  You must obey the GNU General Public License in

 * all respects for all other code used.  Additionally, AlliedModders LLC grants

 * this exception to all derivative works.  AlliedModders LLC defines further

 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

 * or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#ifndef _INCLUDE_SOURCEMOD_MAIN_HELPER_INTERFACE_H_

#define _INCLUDE_SOURCEMOD_MAIN_HELPER_INTERFACE_H_

/**

 * @file ISourceMod.h

 * @brief Defines miscellaneous helper functions useful to extensions.

 */

#include <IHandleSys.h>

#include <sp_vm_api.h>

#include <IDataPack.h>

#include <time.h>

#define SMINTERFACE_SOURCEMOD_NAME		"ISourceMod"

#define SMINTERFACE_SOURCEMOD_VERSION	13

/**

* @brief Forward declaration of the KeyValues class.

*/

class KeyValues;

namespace SourceMod

{

	/**

	 * @brief Describes various ways of formatting a base path.

	 */

	enum PathType

	{

		Path_None = 0,			/**< No base path */

		Path_Game,				/**< Base path is absolute mod folder */

		Path_SM,				/**< Base path is absolute to SourceMod */

		Path_SM_Rel,			/**< Base path is relative to SourceMod */

	};

	/**

	 * @brief Called when a game frame is fired.

	 *

	 * @param simulating		Whether or not the game is ticking.

	 */

	typedef void (*GAME_FRAME_HOOK)(bool simulating);

	/**

	 * @brief Function type for FrameAction callbacks.

	 *

	 * @param data				User data pointer.

	 */

	typedef void (*FRAMEACTION)(void *data);

	/**

	 * @brief Contains miscellaneous helper functions.

	 */

	class ISourceMod : public SMInterface

	{

	public:

		virtual const char *GetInterfaceName()

		{

			return SMINTERFACE_SOURCEMOD_NAME;

		}

		virtual unsigned int GetInterfaceVersion()

		{

			return SMINTERFACE_SOURCEMOD_VERSION;

		}

	public:

		/**

		 * @brief Returns the full path to the game directory.

		 *

		 * @return			A string containing the full game path.

		 */

		virtual const char *GetGamePath() const =0;

		/**

		 * @brief Returns the full path to the SourceMod directory.

		 *

		 * @return			A string containing the full SourceMod path.

		 */

		virtual const char *GetSourceModPath() const =0;

		/**

		 * @brief Builds a platform path for a specific target base path.

		 *

		 * If the path starts with the string "file://" and the PathType is 

		 * not relative, then the "file://" portion is stripped off, and the 

		 * rest of the path is used without any modification (except for 

		 * correcting slashes).  This can be used to override the path 

		 * builder to supply alternate absolute paths.  Examples:

		 *

		 * file://C:/Temp/file.txt

		 * file:///tmp/file.txt

		 *

		 * @param type		Type of path to use as a base.

		 * @param buffer	Buffer to write to.

		 * @param maxlength	Size of buffer.

		 * @param format	Format string.

		 * @param ...		Format arguments.

		 * @return			Number of bytes written.

		 */

		virtual size_t BuildPath(PathType type, char *buffer, size_t maxlength, const char *format, ...) =0;

		/**

		 * @brief Logs a message to the SourceMod logs.

		 *

		 * @param pExt		Extension calling this function.

		 * @param format	Message format.

		 * @param ...		Message format parameters.

		 */

		virtual void LogMessage(IExtension *pExt, const char *format, ...) =0;

		/**

		 * @brief Logs a message to the SourceMod error logs.

		 *

		 * @param pExt		Extension calling this function.

		 * @param format	Message format.

		 * @param ...		Message format parameters.

		 */

		virtual void LogError(IExtension *pExt, const char *format, ...) =0;

		/**

		 * @brief Formats a string from a native.

		 *

		 * @param buffer		Buffer to store message.

		 * @param maxlength		Maximum length of buffer (including null terminator).

		 * @param pContext		Pointer to the plugin's context.

		 * @param params		Parameter array that was passed to the native.

		 * @param param			Parameter index where format string and variable arguments begin.

		 *						Note: parameter indexes start at 1.

		 * @return				Number of bytes written, not including the null terminator.

		 */

		virtual size_t FormatString(char *buffer, 

									size_t maxlength, 

									SourcePawn::IPluginContext *pContext,

									const cell_t *params,

									unsigned int param) =0;

		/**

		 * @brief Creates a data pack object.

		 *

		 * @return			A new IDataPack object.

		 */

		virtual IDataPack *CreateDataPack() =0;

		/**

		 * @brief Releases a data pack's resources so it can be re-used.

		 *

		 * @param pack		An IDataPack object to release.

		 */

		virtual void FreeDataPack(IDataPack *pack) =0;

		/**

		 * @brief Not implemented, do not use.

		 *

		 * @param readonly	Ignored

		 * @return			0

		 */

		virtual HandleType_t GetDataPackHandleType(bool readonly=false) =0;

		/**

		 * @brief Retrieves a KeyValues pointer from a handle.

		 *

		 * @param hndl		Handle_t from which to retrieve contents.

		 * @param err		Optional address to store a possible handle error.

		 * @param root		If true it will return the root KeyValues pointer for the whole structure.

		 *

		 * @return			The KeyValues pointer, or NULL for any error encountered.

		 */

		virtual KeyValues *ReadKeyValuesHandle(Handle_t hndl, HandleError *err=NULL, bool root=false) =0;

		/**

		 * @brief Returns the name of the game directory.

		 *

		 * @return			A string containing the name of the game directory.

		 */

		virtual const char *GetGameFolderName() const =0;

		/**

		 * @brief Returns the scripting engine interface.

		 *

		 * @return			A pointer to the scripting engine interface.

		 */

		virtual SourcePawn::ISourcePawnEngine *GetScriptingEngine() =0;

		/**

		 * @brief Deprecated, do not use.

		 *

		 * @return			NULL.

		 */

		virtual SourcePawn::IVirtualMachine *GetScriptingVM() =0;

		/**

		 * @brief Returns the adjusted server time.

		 *

		 * @return			Adjusted server time.

		 */

		virtual time_t GetAdjustedTime() =0;

		/**

		 * @brief Sets the global client SourceMod will use for assisted 

		 * translations (that is, %t).

		 *

		 * @param index		Client index.

		 * @deprecated		Use ITranslator::GetGlobalTarget() instead.

		 * @return			Old global client value.

		 */

		virtual unsigned int SetGlobalTarget(unsigned int index) =0;

		/**

		 * @brief Returns the global client SourceMod is currently using 

		 * for assisted translations (that is, %t).

		 *

		 * @deprecated		Use ITranslator::GetGlobalTarget() instead.

		 * @return			Global client value.

		 */

		virtual unsigned int GetGlobalTarget() const =0;

		/**

		 * @brief Adds a function to be called each game frame.

		 *

		 * @param hook		Hook function.

		 */

		virtual void AddGameFrameHook(GAME_FRAME_HOOK hook) =0;

		/**

		 * @brief Removes one game frame hook matching the given function.

		 *

		 * @param hook		Hook function.

		 */

		virtual void RemoveGameFrameHook(GAME_FRAME_HOOK hook) =0;

		/**

		 * @brief Platform-safe wrapper around snprintf().

		 *

		 * @param buffer	String buffer.

		 * @param maxlength	Maximum length of buffer.

		 * @param fmt		Format specifier string.

		 * @param ...		Format arguments.

		 * @return			Number of bytes (not including null terminator) written.

		 */

		virtual size_t Format(char *buffer, size_t maxlength, const char *fmt, ...) = 0;

		/**

		 * @brief Platform-safe wrapper around vsnprintf().

		 *

		 * @param buffer	String buffer.

		 * @param maxlength	Maximum length of buffer.

		 * @param fmt		Format specifier string.

		 * @param ap		Format arguments.

		 * @return			Number of bytes (not including null terminator) written.

		 */

		virtual size_t FormatArgs(char *buffer, size_t maxlength, const char *fmt, va_list ap) = 0;

		/**

		 * @brief Adds an action to be executed on the next available frame.

		 *

		 * This function is thread safe.

		 *

		 * @param fn		Function to execute.

		 * @param data		Data to pass to function.

		 */

		virtual void AddFrameAction(FRAMEACTION fn, void *data) = 0;

		/**

		 * @brief Retrieves a core.cfg configuration value.

		 *

		 * @param key		Core.cfg key phrase.

		 * @return			Value string, or NULL on failure.

		 *					The string will be destroyed on core.cfg reparses.

		 */

		virtual const char *GetCoreConfigValue(const char *key) = 0;

		/**

		 * @brief Returns SourceMod's Metamod:Source plugin ID.

		 *

		 * @return			Metamod:Source PluginId.

		 */

		virtual int GetPluginId() = 0;

		/**

		 * @brief Returns SourceHook's API version.

		 *

		 * @return			SourceHook API version number.

		 */

		virtual int GetShApiVersion() = 0;

		/**

		 * @brief Returns whether or not a map is currently running.

		 *

		 * @return			True if a map is currently running, otherwise false.

		 */

		virtual bool IsMapRunning() = 0;

	};

}

#endif //_INCLUDE_SOURCEMOD_MAIN_HELPER_INTERFACE_H_