#include "../qcommon/exe_headers.h"

typedef struct cmd_function_s
{
	struct cmd_function_s	*next;
	char					*name;
	xcommand_t				function;
} cmd_function_t;


static	cmd_function_t	*cmd_functions;		// possible commands to execute


/*
============
Cmd_AddCommand
============
*/
void	Cmd_AddCommand( const char *cmd_name, xcommand_t function ) {
	cmd_function_t	*cmd;
	
	// fail if the command already exists
	for ( cmd = cmd_functions ; cmd ; cmd=cmd->next ) {
		if ( !strcmp( cmd_name, cmd->name ) ) {
			// allow completion-only commands to be silently doubled
			if ( function != NULL ) {
				Com_Printf ("Cmd_AddCommand: %s already defined\n", cmd_name);
			}
			return;
		}
	}

	// use a small malloc to avoid zone fragmentation
	cmd = (struct cmd_function_s *)S_Malloc (sizeof(cmd_function_t));
	cmd->name = CopyString( cmd_name );
	cmd->function = function;
	cmd->next = cmd_functions;
	cmd_functions = cmd;
}

/*
============
Cmd_RemoveCommand
============
*/
void	Cmd_RemoveCommand( const char *cmd_name ) {
	cmd_function_t	*cmd, **back;

	back = &cmd_functions;
	while( 1 ) {
		cmd = *back;
		if ( !cmd ) {
			// command wasn't active
			return;
		}
		if ( !strcmp( cmd_name, cmd->name ) ) {
			*back = cmd->next;
			if (cmd->name) {
				Z_Free(cmd->name);
			}
			Z_Free (cmd);
			return;
		}
		back = &cmd->next;
	}
}



/*
============
Cmd_CommandCompletion
============
*/
void	Cmd_CommandCompletion( void(*callback)(const char *s) ) {
	cmd_function_t	*cmd;
	
	for (cmd=cmd_functions ; cmd ; cmd=cmd->next) {
		callback( cmd->name );
	}
}


/*
============
Cmd_ExecuteString

A complete command line has been parsed, so try to execute it
============
*/
void	Cmd_ExecuteString( const char *text ) {	
	cmd_function_t	*cmd, **prev;

	// execute the command line
	Cmd_TokenizeString( text );		
	if ( !Cmd_Argc() ) {
		return;		// no tokens
	}

	// check registered command functions	
	for ( prev = &cmd_functions ; *prev ; prev = &cmd->next ) {
		cmd = *prev;
		if ( !Q_stricmp( Cmd_Argv(0), cmd->name ) ) {
			// rearrange the links so that the command will be
			// near the head of the list next time it is used
			*prev = cmd->next;
			cmd->next = cmd_functions;
			cmd_functions = cmd;

			// perform the action
			if ( !cmd->function ) {
				// let the cgame or game handle it
				break;
			} else {
				cmd->function ();
			}
			return;
		}
	}
	
	// check cvars
	if ( Cvar_Command() ) {
		return;
	}

	// check client game commands
	if ( com_cl_running && com_cl_running->integer && CL_GameCommand() ) {
		return;
	}

	// check server game commands
	if ( com_sv_running && com_sv_running->integer && SV_GameCommand() ) {
		return;
	}

	// check ui commands
	if ( com_cl_running && com_cl_running->integer && UI_GameCommand() ) {
		return;
	}

	// send it as a server command if we are connected
	// this will usually result in a chat message
	//CL_ForwardCommandToServer ( text );
	CL_ForwardCommandToServer ( text );
}


/*
============
Cmd_List_f
============
*/
void Cmd_List_f (void)
{
	cmd_function_t	*cmd;
	int				i;
	char			*match;

	if ( Cmd_Argc() > 1 ) {
		match = Cmd_Argv( 1 );
	} else {
		match = NULL;
	}

	i = 0;
	for (cmd=cmd_functions ; cmd ; cmd=cmd->next) {
		if (match && !Com_Filter(match, cmd->name, qfalse)) continue;

		Com_Printf ("%s\n", cmd->name);
		i++;
	}
	Com_Printf ("%i commands\n", i);
}