/*
	cmd.c

	Quake script command processing module

	Copyright (C) 1996-1997  Id Software, Inc.
	Copyright (C) 1999,2000  contributors of the QuakeForge project
	Please see the file "AUTHORS" for a list of contributors

	This program 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 2
	of the License, or (at your option) any later version.

	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, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#include <common.h>
#include <qargs.h>
#include <cmd.h>
#include <console.h>
#include <cvar.h>
#include <sys.h>
#include <client.h>
#include <lib_replace.h>
#include <zone.h>
#include <string.h>
#include <ctype.h>
#include <net.h>
#include <common_quakedef.h>
#include <cvars.h>

void Cmd_ForwardToServer (void);

#define	MAX_ALIAS_NAME	32

typedef struct cmdalias_s
{
	struct cmdalias_s	*next;
	char	name[MAX_ALIAS_NAME];
	char	*value;
} cmdalias_t;

cmdalias_t	*cmd_alias;

qboolean	cmd_wait;

cvar_t	*cl_warncmd;
//=============================================================================

/*
============
Cmd_Wait_f

Causes execution of the remainder of the command buffer to be delayed until
next frame.  This allows commands like:
bind g "impulse 5 ; +attack ; wait ; -attack ; impulse 2"
============
*/
void Cmd_Wait_f (void)
{
	cmd_wait = true;
}

/*
=============================================================================

						COMMAND BUFFER

=============================================================================
*/

sizebuf_t	cmd_text;
byte		cmd_text_buf[8192];

/*
============
Cbuf_Init
============
*/
void Cbuf_Init (void)
{
	cmd_text.data = cmd_text_buf;
	cmd_text.maxsize = sizeof(cmd_text_buf);
}

/*
============
Cbuf_AddText

Adds command text at the end of the buffer
============
*/
void Cbuf_AddText (char *text)
{
	int		l;

	l = Q_strlen (text);

	if (cmd_text.cursize + l >= cmd_text.maxsize)
	{
		Con_Printf ("Cbuf_AddText: overflow\n");
		return;
	}
	SZ_Write (&cmd_text, text, Q_strlen (text));
}


/*
============
Cbuf_InsertText

Adds command text immediately after the current command
Adds a \n to the text
FIXME: actually change the command buffer to do less copying
============
*/
void Cbuf_InsertText (char *text)
{
	char	*temp;
	int		templen;

// copy off any commands still remaining in the exec buffer
	templen = cmd_text.cursize;
	if (templen)
	{
		temp = Z_Malloc (templen);
		Q_memcpy (temp, cmd_text.data, templen);
		SZ_Clear (&cmd_text);
	}
	else
		temp = NULL;	// shut up compiler

// add the entire text of the file
	Cbuf_AddText (text);
	SZ_Write (&cmd_text, "\n", 1);
// add the copied off data
	if (templen)
	{
		SZ_Write (&cmd_text, temp, templen);
		Z_Free (temp);
	}
}

static void
extract_line(char *line)
{
	int		i;
	char	*text;
	int	quotes;

	// find a \n or ; line break
	text = (char *)cmd_text.data;
	quotes = 0;
	for (i=0 ; i< cmd_text.cursize ; i++) {
		if (text[i] == '"')
			quotes++;
		if ( !(quotes&1) &&  text[i] == ';')
			break;	// don't break if inside a quoted string
		if (text[i] == '\n' || text[i] == '\r')
			break;
	}

	memcpy (line, text, i);
	line[i] = '\0';
	// delete the text from the command buffer and move remaining commands down
	// this is necessary because commands (exec, alias) can insert data at the
	// beginning of the text buffer

	if (i == cmd_text.cursize)
		cmd_text.cursize = 0;
	else {
		i++;
		cmd_text.cursize -= i;
		Q_memcpy (text, text+i, cmd_text.cursize);
	}
}

/*

	Cbuf_Execute

*/
void
Cbuf_Execute (void)
{
	char	line[1024] = {0};

	while (cmd_text.cursize) {
		extract_line (line);
		// execute the command line
		Con_DPrintf("+%s\n",line),
		Cmd_ExecuteString (line, src_command);

		if (cmd_wait)
		{	// skip out while text still remains in buffer, leaving it
			// for next frame
			cmd_wait = false;
			break;
		}
	}
}
/*

	Cbuf_Execute

*/
void
Cbuf_Execute_Sets (void)
{
	char	line[1024] = {0};

	while (cmd_text.cursize) {
		extract_line (line);
		// execute the command line
		if (strncmp(line,"set",3)==0
			&& isspace((int) line[3]))
			Con_DPrintf("+%s\n",line),
			Cmd_ExecuteString (line, src_command);
	}
}

/*
==============================================================================

						SCRIPT COMMANDS

==============================================================================
*/

/*
===============
Cmd_StuffCmds_f

Adds command line parameters as script statements
Commands lead with a +, and continue until a - or another +
quake +prog jctest.qp +cmd amlev1
quake -nosound +cmd amlev1
===============
*/
void Cmd_StuffCmds_f (void)
{
	int		i, j;
	int		s;
	char	*build, c;

	s = strlen (com_cmdline);
	if (!s)
		return;

// pull out the commands
	build = Z_Malloc (s+1);
	build[0] = 0;

	for (i=0 ; i<s-1 ; i++)
	{
		if (com_cmdline[i] == '+')
		{
			i++;

			for (j=i ; ((com_cmdline[j] != '+')
						&& (com_cmdline[j] != '-')
						&& (com_cmdline[j] != 0)) ; j++)
				;

			c = com_cmdline[j];
			com_cmdline[j] = 0;

			Q_strcat (build, com_cmdline+i);
			Q_strcat (build, "\n");
			com_cmdline[j] = c;
			i = j-1;
		}
	}

	//Con_Printf("[\n%s]\n",build);

	if (build[0])
		Cbuf_InsertText (build);

	Z_Free (build);
}

/*

  Cmd_Exec_File

*/
void
Cmd_Exec_File (char *path)
{
	char	*f;
	int		mark;
	int		len;
	char	base[32];
	QFile   *file;

	if ((file = Qopen (path, "r")) != NULL) {
		// extract the filename base name for hunk tag
		COM_FileBase (path, base);
		len = COM_filelength (file);
		mark = Hunk_LowMark ();
		f = (char *)Hunk_AllocName (len+1, base);
		if (f) {
			f[len] = 0;
			Qread (file, f, len);
			Qclose (file);
			Cbuf_InsertText (f);
		}
		Hunk_FreeToLowMark (mark);
	}
}

/*
===============
Cmd_Exec_f
===============
*/
void Cmd_Exec_f (void)
{
	char	*f;
	int		mark;

	if (Cmd_Argc () != 2)
	{
		Con_Printf ("exec <filename> : execute a script file\n");
		return;
	}

	// FIXME: is this safe freeing the hunk here???
	mark = Hunk_LowMark ();
	f = (char *)COM_LoadHunkFile (Cmd_Argv(1));
	if (!f)
	{
		Con_Printf ("couldn't exec %s\n",Cmd_Argv(1));
		return;
	}
	if (!Cvar_Command () && (cl_warncmd->value || developer->value))
		Con_Printf ("execing %s\n",Cmd_Argv(1));

	Cbuf_InsertText (f);
	Hunk_FreeToLowMark (mark);
}


/*
===============
Cmd_Echo_f

Just prints the rest of the line to the console
===============
*/
void Cmd_Echo_f (void)
{
	int		i;

	for (i=1 ; i<Cmd_Argc() ; i++)
		Con_Printf ("%s ",Cmd_Argv(i));
	Con_Printf ("\n");
}

/*
===============
Cmd_Alias_f

Creates a new command that executes a command string (possibly ; seperated)
===============
*/

char *CopyString (char *in)
{
	char	*out;

	out = Z_Malloc (strlen(in)+1);
	strcpy (out, in);
	return out;
}

void Cmd_Alias_f (void)
{
	cmdalias_t	*a;
	char		cmd[1024];
	int			i, c;
	char		*s;

	if (Cmd_Argc() == 1)
	{
		Con_Printf ("Current alias commands:\n");
		for (a = cmd_alias ; a ; a=a->next)
			Con_Printf ("%s : %s\n", a->name, a->value);
		return;
	}

	s = Cmd_Argv(1);
	if (strlen(s) >= MAX_ALIAS_NAME)
	{
		Con_Printf ("Alias name is too long\n");
		return;
	}

	// if the alias allready exists, reuse it
	for (a = cmd_alias ; a ; a=a->next)
	{
		if (!strcmp(s, a->name))
		{
			Z_Free (a->value);
			break;
		}
	}

	if (!a)
	{
		a = Z_Malloc (sizeof(cmdalias_t));
		a->next = cmd_alias;
		cmd_alias = a;
	}
	strcpy (a->name, s);

// copy the rest of the command line
	cmd[0] = 0;		// start out with a null string
	c = Cmd_Argc();
	for (i=2 ; i< c ; i++)
	{
		strcat (cmd, Cmd_Argv(i));
		if (i != c)
			strcat (cmd, " ");
	}
	strcat (cmd, "\n");

	a->value = CopyString (cmd);
}

void Cmd_UnAlias_f (void)
{
	cmdalias_t	*a, *prev;
	char		*s;

	if (Cmd_Argc() != 2)
	{
		Con_Printf ("unalias <alias>: erase an existing alias\n");
		return;
	}

	s = Cmd_Argv(1);
	if (strlen(s) >= MAX_ALIAS_NAME)
	{
		Con_Printf ("Alias name is too long\n");
		return;
	}

	prev = cmd_alias;
	for (a = cmd_alias ; a ; a = a->next)
	{
		if (!strcmp(s, a->name))
		{
			Z_Free (a->value);
			prev->next = a->next;
			if (a == cmd_alias)
				cmd_alias = a->next;
			Z_Free (a);
			return;
		}
		prev = a;
	}
	Con_Printf ("Unknown alias \"%s\"\n", s);
}

/*
=============================================================================

					COMMAND EXECUTION

=============================================================================
*/

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


#define	MAX_ARGS		80

static	int			cmd_argc;
static	char		*cmd_argv[MAX_ARGS];
static	char		*cmd_null_string = "";
static	char		*cmd_args = NULL;
cmd_source_t		cmd_source;



static	cmd_function_t	*cmd_functions;		// possible commands to execute

/*
============
Cmd_Argc
============
*/
int		Cmd_Argc (void)
{
	return cmd_argc;
}

/*
============
Cmd_Argv
============
*/
char	*Cmd_Argv (int arg)
{
	if ( arg >= cmd_argc )
		return cmd_null_string;
	return cmd_argv[arg];
}

/*
============
Cmd_Args

Returns a single string containing argv(1) to argv(argc()-1)
============
*/
char		*Cmd_Args (void)
{
	if (!cmd_args)
		return "";
	return cmd_args;
}


/*
============
Cmd_TokenizeString

Parses the given string into command line tokens.
============
*/
void Cmd_TokenizeString (char *text)
{
	int		i;

// clear the args from the last string
	for (i=0 ; i<cmd_argc ; i++)
		Z_Free (cmd_argv[i]);

	cmd_argc = 0;
	cmd_args = NULL;

	while (1)
	{
// skip whitespace up to a /n
		while (*text && *text <= ' ' && *text != '\n')
		{
			text++;
		}

		if (*text == '\n')
		{	// a newline seperates commands in the buffer
			text++;
			break;
		}

		if (!*text)
			return;

		if (cmd_argc == 1)
			 cmd_args = text;

		text = COM_Parse (text);
		if (!text)
			return;

		if (cmd_argc < MAX_ARGS)
		{
			cmd_argv[cmd_argc] = Z_Malloc (Q_strlen(com_token)+1);
			Q_strcpy (cmd_argv[cmd_argc], com_token);
			cmd_argc++;
		}
	}

}


/*
============
Cmd_AddCommand
============
*/
void	Cmd_AddCommand (char *cmd_name, xcommand_t function)
{
	cmd_function_t	*cmd;

	if (host_initialized)	// because hunk allocation would get stomped
		Sys_Error ("Cmd_AddCommand after host_initialized");

// fail if the command is a variable name
	if (Cvar_VariableString(cmd_name)[0])
	{
		Con_Printf ("Cmd_AddCommand: %s already defined as a var\n", cmd_name);
		return;
	}

// fail if the command already exists
	for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
	{
		if (!Q_strcmp (cmd_name, cmd->name))
		{
			Con_Printf ("Cmd_AddCommand: %s already defined\n", cmd_name);
			return;
		}
	}

	cmd = Hunk_Alloc (sizeof(cmd_function_t));
	cmd->name = cmd_name;
	cmd->function = function;
	cmd->next = cmd_functions;
	cmd_functions = cmd;
}

/*
============
Cmd_Exists
============
*/
qboolean	Cmd_Exists (char *cmd_name)
{
	cmd_function_t	*cmd;

	for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
	{
		if (!Q_strcmp (cmd_name,cmd->name))
			return true;
	}

	return false;
}



/*
============
Cmd_CompleteCommand
============
*/
char *Cmd_CompleteCommand (char *partial)
{
	cmd_function_t	*cmd;
	int				len;
	cmdalias_t		*a;

	len = Q_strlen(partial);

	if (!len)
		return NULL;

// check for exact match
	for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
		if (!strcmp (partial,cmd->name))
			return cmd->name;
	for (a=cmd_alias ; a ; a=a->next)
		if (!strcmp (partial, a->name))
			return a->name;

// check for partial match
	for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
		if (!strncmp (partial,cmd->name, len))
			return cmd->name;
	for (a=cmd_alias ; a ; a=a->next)
		if (!strncmp (partial, a->name, len))
			return a->name;

	return NULL;
}

#ifndef SERVERONLY		// FIXME
/*
===================
Cmd_ForwardToServer

adds the current command line as a clc_stringcmd to the client message.
things like godmode, noclip, etc, are commands directed to the server,
so when they are typed in at the console, they will need to be forwarded.
===================
*/
void Cmd_ForwardToServer (void)
{
	if (cls.state == ca_disconnected)
	{
		Con_Printf ("Can't \"%s\", not connected\n", Cmd_Argv(0));
		return;
	}

	if (cls.demoplayback)
		return;		// not really connected

	MSG_WriteByte (&cls.netchan.message, clc_stringcmd);
	SZ_Print (&cls.netchan.message, Cmd_Argv(0));
	if (Cmd_Argc() > 1) {
		SZ_Print (&cls.netchan.message, " ");
		SZ_Print (&cls.netchan.message, Cmd_Args());
	}
#if 0
	MSG_WriteByte (&cls.message, clc_stringcmd);
	SZ_Print (&cls.message, Cmd_Argv(0));
	if (Cmd_Argc() > 1) {
		SZ_Print (&cls.message, " ");
		SZ_Print (&cls.message, Cmd_Args());
	}
#endif
}

// don't forward the first argument
void Cmd_ForwardToServer_f (void)
{
	if (cls.state == ca_disconnected)
	{
		Con_Printf ("Can't \"%s\", not connected\n", Cmd_Argv(0));
		return;
	}

	if (Q_strcasecmp(Cmd_Argv(1), "snap") == 0) {
		Cbuf_InsertText ("snap\n");
		return;
	}

	if (cls.demoplayback)
		return;		// not really connected

	if (Cmd_Argc() > 1) {
		MSG_WriteByte (&cls.netchan.message, clc_stringcmd);
		SZ_Print (&cls.netchan.message, Cmd_Args());
#if 0
		MSG_WriteByte (&cls.message, clc_stringcmd);
		SZ_Print (&cls.message, Cmd_Args());
#endif
	}
}
#else
void Cmd_ForwardToServer (void)
{
}
#endif

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

A complete command line has been parsed, so try to execute it
FIXME: lookupnoadd the token to speed search?
============
*/
void Cmd_ExecuteString (char *text, cmd_source_t src)
{
	cmd_function_t	*cmd;
	cmdalias_t		*a;

	cmd_source = src;
	Cmd_TokenizeString (text);

// execute the command line
	if (!Cmd_Argc())
		return;		// no tokens

// check functions
	for (cmd=cmd_functions ; cmd ; cmd=cmd->next)
	{
		if (!Q_strcasecmp (cmd_argv[0],cmd->name))
		{
			if (!cmd->function)
				Cmd_ForwardToServer ();
			else
				cmd->function ();
			return;
		}
	}

// Tonik: check cvars
	if (Cvar_Command())
		return;

// check alias
	for (a=cmd_alias ; a ; a=a->next)
	{
		if (!Q_strcasecmp (cmd_argv[0], a->name))
		{
			Cbuf_InsertText (a->value);
			return;
		}
	}

	if (cl_warncmd->value || developer->value)
		Con_Printf ("Unknown command \"%s\"\n", Cmd_Argv(0));

}



/*
================
Cmd_CheckParm

Returns the position (1 to argc-1) in the command's argument list
where the given parameter apears, or 0 if not present
================
*/
int Cmd_CheckParm (char *parm)
{
	int i;

	if (!parm)
		Sys_Error ("Cmd_CheckParm: NULL");

	for (i = 1; i < Cmd_Argc (); i++)
		if (! Q_strcasecmp (parm, Cmd_Argv (i)))
			return i;

	return 0;
}

void Cmd_CmdList_f (void)
{
	cmd_function_t	*cmd;
	int	i;

	for (cmd=cmd_functions, i=0 ; cmd ; cmd=cmd->next, i++)
	{
		Con_Printf("%s\n", cmd->name);
	}

	Con_Printf ("------------\n%d commands\n", i);
}

/*
============
Cmd_Init
============
*/
void Cmd_Init (void)
{
//
// register our commands
//
	Cmd_AddCommand ("stuffcmds",Cmd_StuffCmds_f);
	Cmd_AddCommand ("exec",Cmd_Exec_f);
	Cmd_AddCommand ("echo",Cmd_Echo_f);
	Cmd_AddCommand ("alias",Cmd_Alias_f);
	Cmd_AddCommand ("unalias",Cmd_UnAlias_f);
	Cmd_AddCommand ("wait", Cmd_Wait_f);
	Cmd_AddCommand ("cmdlist", Cmd_CmdList_f);
#ifndef SERVERONLY
	Cmd_AddCommand ("cmd", Cmd_ForwardToServer_f);
#endif
}