/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
 *                       E-mail:
 *                <brain@chatspike.net>
 *                <Craig@chatspike.net>
 *
 * Written by Craig Edwards, Craig McLure, and others.
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

using namespace std;

#include "inspircd_config.h"
#include "inspircd.h"
#include "inspircd_io.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <time.h>
#include <string>
#ifdef GCC3
#include <ext/hash_map>
#else
#include <hash_map>
#endif
#include <map>
#include <sstream>
#include <vector>
#include <deque>
#include <sched.h>
#ifdef THREADED_DNS
#include <pthread.h>
#endif
#include "users.h"
#include "globals.h"
#include "modules.h"
#include "dynamic.h"
#include "wildcard.h"
#include "message.h"
#include "mode.h"
#include "commands.h"
#include "xline.h"
#include "inspstring.h"
#include "dnsqueue.h"
#include "helperfuncs.h"
#include "hashcomp.h"
#include "socketengine.h"
#include "userprocess.h"
#include "socket.h"
#include "dns.h"
#include "typedefs.h"
#include "command_parse.h"
#include "ctables.h"

#ifdef GCC3
#define nspace __gnu_cxx
#else
#define nspace std
#endif


extern InspIRCd* ServerInstance;

extern std::vector<Module*> modules;
extern std::vector<ircd_module*> factory;
extern std::vector<InspSocket*> module_sockets;
extern std::vector<userrec*> local_users;

extern int MODCOUNT;
extern InspSocket* socket_ref[MAX_DESCRIPTORS];
extern time_t TIME;

// This table references users by file descriptor.
// its an array to make it VERY fast, as all lookups are referenced
// by an integer, meaning there is no need for a scan/search operation.
extern userrec* fd_ref_table[MAX_DESCRIPTORS];

extern Server* MyServer;
extern ServerConfig *Config;

extern user_hash clientlist;
extern chan_hash chanlist;

/* This function pokes and hacks at a parameter list like the following:
 *
 * PART #winbot,#darkgalaxy :m00!
 *
 * to turn it into a series of individual calls like this:
 *
 * PART #winbot :m00!
 * PART #darkgalaxy :m00!
 *
 * The seperate calls are sent to a callback function provided by the caller
 * (the caller will usually call itself recursively). The callback function
 * must be a command handler. Calling this function on a line with no list causes
 * no action to be taken. You must provide a starting and ending parameter number
 * where the range of the list can be found, useful if you have a terminating
 * parameter as above which is actually not part of the list, or parameters
 * before the actual list as well. This code is used by many functions which
 * can function as "one to list" (see the RFC) */

int CommandParser::LoopCall(command_t* fn, char **parameters, int pcnt, userrec *u, int start, int end, int joins)
{
	char plist[MAXBUF];
	char *param;
	char *pars[32];
	char blog[32][MAXBUF];
	char blog2[32][MAXBUF];
	int j = 0, q = 0, total = 0, t = 0, t2 = 0, total2 = 0;
	char keystr[MAXBUF];
	char moo[MAXBUF];

	for (int i = 0; i <32; i++)
	{
		*blog[i] = 0;
		*blog2[i] = 0;
	}

	*moo = 0;
	for (int i = 0; i <10; i++)
	{
		if (!parameters[i])
		{
			parameters[i] = moo;
		}
	}
	if (joins)
	{
		if (pcnt > 1) /* we have a key to copy */
		{
			strlcpy(keystr,parameters[1],MAXBUF);
		}
	}

	if (!parameters[start] || (!strchr(parameters[start],',')))
	{
		return 0;
	}

	*plist = 0;

	for (int i = start; i <= end; i++)
	{
		if (parameters[i])
		{
			strlcat(plist,parameters[i],MAXBUF);
		}
	}

	j = 0;
	param = plist;

	t = strlen(plist);

	for (int i = 0; i < t; i++)
	{
		if (plist[i] == ',')
		{
			plist[i] = '\0';
			strlcpy(blog[j++],param,MAXBUF);
			param = plist+i+1;
			if ((unsigned int)j > Config->MaxTargets)
			{
				WriteServ(u->fd,"407 %s %s :Too many targets in list, message not delivered.",u->nick,blog[j-1]);
				return 1;
			}
		}
	}

	strlcpy(blog[j++],param,MAXBUF);
	total = j;

	if ((joins) && (keystr) && (total>0)) // more than one channel and is joining
	{
		strcat(keystr,",");
	}

	if ((joins) && (keystr))
	{
		if (strchr(keystr,','))
		{
			j = 0;
			param = keystr;
			t2 = strlen(keystr);

			for (int i = 0; i < t2; i++)
			{
				if (keystr[i] == ',')
				{
					keystr[i] = '\0';
					strlcpy(blog2[j++],param,MAXBUF);
					param = keystr+i+1;
				}
			}

			strlcpy(blog2[j++],param,MAXBUF);
			total2 = j;
		}
	}

	for (j = 0; j < total; j++)
	{
		if (blog[j])
		{
			pars[0] = blog[j];
		}

		for (q = end; q < pcnt-1; q++)
		{
			if (parameters[q+1])
			{
				pars[q-end+1] = parameters[q+1];
			}
		}

		if ((joins) && (parameters[1]))
		{
			if (pcnt > 1)
			{
				pars[1] = blog2[j];
			}
			else
			{
				pars[1] = NULL;
			}
		}

		/* repeatedly call the function with the hacked parameter list */
		if ((joins) && (pcnt > 1))
		{
			if (pars[1])
			{
				// pars[1] already set up and containing key from blog2[j]
				fn->Handle(pars,2,u);
			}
			else
			{
				pars[1] = parameters[1];
				fn->Handle(pars,2,u);
			}
		}
		else
		{
			fn->Handle(pars,pcnt-(end-start),u);
		}
	}

	return 1;
}

bool CommandParser::IsValidCommand(std::string &commandname, int pcnt, userrec * user)
{
	nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);

	if (n != cmdlist.end())
	{
		if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
		{
			if ((strchr(user->modes,n->second->flags_needed)) || (!n->second->flags_needed))
			{
				if (n->second->flags_needed)
				{
					if ((user->HasPermission(commandname)) || (is_uline(user->server)))
					{
						return true;
					}
					else
					{
						return false;
					}
				}

				return true;
			}
		}
	}

	return false;
}

// calls a handler function for a command

void CommandParser::CallHandler(std::string &commandname,char **parameters, int pcnt, userrec *user)
{
	nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);

	if (n != cmdlist.end())
	{
		if (pcnt >= n->second->min_params)
		{
			if ((strchr(user->modes,n->second->flags_needed)) || (!n->second->flags_needed))
			{
				if (n->second->flags_needed)
				{
					if ((user->HasPermission(commandname)) || (is_uline(user->server)))
					{
						n->second->Handle(parameters,pcnt,user);
					}
					else
					{
						if (!IS_LOCAL(user))
							WriteOpers("*** \2WARNING\2: Command '%s' not allowed for oper '%s', dropped.",commandname.c_str(),user->nick);
					}
				}
				else
				{
					n->second->Handle(parameters,pcnt,user);
				}
			}
		}
	}
}

int CommandParser::ProcessParameters(char **command_p,char *parameters)
{
	int j = 0;
	int q = strlen(parameters);

	if (!q)
	{
		/* no parameters, command_p invalid! */
		return 0;
	}

	if (parameters[0] == ':')
	{
		command_p[0] = parameters+1;
		return 1;
	}

	if (q)
	{
		if ((strchr(parameters,' ')==NULL) || (parameters[0] == ':'))
		{
			/* only one parameter */
			command_p[0] = parameters;
			if (parameters[0] == ':')
			{
				if (strchr(parameters,' ') != NULL)
				{
					command_p[0]++;
				}
			}

			return 1;
		}
	}

	command_p[j++] = parameters;

	for (int i = 0; i <= q; i++)
	{
		if (parameters[i] == ' ')
		{
			command_p[j++] = parameters+i+1;
			parameters[i] = '\0';

			if (command_p[j-1][0] == ':')
			{
				*command_p[j-1]++; /* remove dodgy ":" */
				break;
				/* parameter like this marks end of the sequence */
			}
		}
	}

	return j; /* returns total number of items in the list */
}

void CommandParser::ProcessCommand(userrec *user, char* cmd)
{
	char *parameters;
	char *command;
	char *command_p[127];
	char p[MAXBUF], temp[MAXBUF];
	int j, items, cmd_found;
	int total_params = 0;
	unsigned int xl;

	for (int i = 0; i < 127; i++)
		command_p[i] = NULL;

	if (!user || !cmd || !*cmd)
	{
		return;
	}

	xl = strlen(cmd);

	if (xl > 2)
	{
		for (unsigned int q = 0; q < xl - 1; q++)
		{
			if (cmd[q] == ' ')
			{
				if (cmd[q+1] == ':')
				{
					total_params++;
					// found a 'trailing', we dont count them after this.
					break;
				}
				else
					total_params++;
			}
		}
	}

	// another phidjit bug...
	if (total_params > 126)
	{
		*(strchr(cmd,' ')) = '\0';
		WriteServ(user->fd,"421 %s %s :Too many parameters given",user->nick,cmd);
		return;
	}

	strlcpy(temp,cmd,MAXBUF);

	std::string tmp = cmd;

	for (int i = 0; i <= MODCOUNT; i++)
	{
		std::string oldtmp = tmp;
		modules[i]->OnServerRaw(tmp,true,user);
		if (oldtmp != tmp)
		{
			log(DEBUG,"A Module changed the input string!");
			log(DEBUG,"New string: %s",tmp.c_str());
			log(DEBUG,"Old string: %s",oldtmp.c_str());
			break;
		}
	}

	strlcpy(cmd,tmp.c_str(),MAXBUF);
	strlcpy(temp,cmd,MAXBUF);

	if (!strchr(cmd,' '))
	{
		/*
		 * no parameters, lets skip the formalities and not chop up
		 * the string
		 */
		log(DEBUG,"About to preprocess command with no params");
		items = 0;
		command_p[0] = NULL;
		parameters = NULL;
		unsigned int tl = strlen(cmd);
		for (unsigned int i = 0; i <= tl; i++)
		{
			cmd[i] = toupper(cmd[i]);
		}
		command = cmd;
	}
	else
	{
		*cmd = 0;
		j = 0;

		unsigned int vl = strlen(temp);
		/* strip out extraneous linefeeds through mirc's crappy pasting (thanks Craig) */
		for (unsigned int i = 0; i < vl; i++)
		{
			if ((temp[i] != 10) && (temp[i] != 13) && (temp[i] != 0) && (temp[i] != 7))
			{
				cmd[j++] = temp[i];
				cmd[j] = 0;
			}
		}

		/* split the full string into a command plus parameters */
		parameters = p;
		p[0] = ' ';
		p[1] = 0;

		command = cmd;

		if (strchr(cmd,' '))
		{
			unsigned int cl = strlen(cmd);

			for (unsigned int i = 0; i <= cl; i++)
			{
				/* capitalise the command ONLY, leave params intact */
				cmd[i] = toupper(cmd[i]);
				/* are we nearly there yet?! :P */
				if (cmd[i] == ' ')
				{
					command = cmd;
					parameters = cmd+i+1;
					cmd[i] = '\0';
					break;
				}
			}
		}
		else
		{
			for (char* i = cmd; *i; i++)
			{
				*i = toupper(*i);
			}
		}
	}

	if (strlen(command)>MAXCOMMAND)
	{
		WriteServ(user->fd,"421 %s %s :Command too long",user->nick,command);
		return;
	}

	for (char* x = command; *x; x++)
	{
		if (((*x < 'A') || (*x > 'Z')) && (*x != '.'))
		{
			if (((*x < '0') || (*x> '9')) && (*x != '-'))
			{
				if (strchr("@!\"$%^&*(){}[]_=+;:'#~,<>/?\\|`",*x))
				{
					ServerInstance->stats->statsUnknown++;
					WriteServ(user->fd,"421 %s %s :Unknown command",user->nick,command);
					return;
				}
			}
		}
	}

	std::string xcommand = command;
	if ((user->registered != 7) && (xcommand == "SERVER"))
	{
		kill_link(user,"Server connection to non-server port");
		return;
	}
	
	/* Tweak by brain - why was this INSIDE the mainloop? */
	if (parameters)
	{
		 if (parameters[0])
		 {
			 items = this->ProcessParameters(command_p,parameters);
		 }
		 else
		 {
			 items = 0;
			 command_p[0] = NULL;
		 }
	}
	else
	{
		items = 0;
		command_p[0] = NULL;
	}

	int MOD_RESULT = 0;
	FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false));
	if (MOD_RESULT == 1) {
		return;
	}
	
	nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(xcommand);
	
	if (cm != cmdlist.end())
	{
		if (user)
		{
			/* activity resets the ping pending timer */
			user->nping = TIME + user->pingmax;
			if ((items) < cm->second->min_params)
			{
				log(DEBUG,"not enough parameters: %s %s",user->nick,command);
				WriteServ(user->fd,"461 %s %s :Not enough parameters",user->nick,command);
				return;
			}
			if ((!strchr(user->modes,cm->second->flags_needed)) && (cm->second->flags_needed))
			{
				log(DEBUG,"permission denied: %s %s",user->nick,command);
				WriteServ(user->fd,"481 %s :Permission Denied- You do not have the required operator privilages",user->nick);
				cmd_found = 1;
				return;
			}
			if ((cm->second->flags_needed) && (!user->HasPermission(xcommand)))
			{
				log(DEBUG,"permission denied: %s %s",user->nick,command);
				WriteServ(user->fd,"481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command);
				if (!IS_LOCAL(user))
					WriteOpers("*** \2WARNING\2: Command '%s' not allowed for oper '%s', dropped.",command,user->nick);
				cmd_found = 1;
				return;
			}
			/* if the command isnt USER, PASS, or NICK, and nick is empty,
			 * deny command! */
			if ((strncmp(command,"USER",4)) && (strncmp(command,"NICK",4)) && (strncmp(command,"PASS",4)))
			{
				if ((!isnick(user->nick)) || (user->registered != 7))
				{
					log(DEBUG,"not registered: %s %s",user->nick,command);
					WriteServ(user->fd,"451 %s :You have not registered",command);
					return;
				}
			}
			if ((user->registered == 7) && (!*user->oper) && (*Config->DisabledCommands))
			{
				std::stringstream dcmds(Config->DisabledCommands);
				std::string thiscmd;
				while (dcmds >> thiscmd)
				{
					if (!strcasecmp(thiscmd.c_str(),command))
					{
						// command is disabled!
						WriteServ(user->fd,"421 %s %s :This command has been disabled.",user->nick,command);
						return;
					}
				}
			}
			if ((user->registered == 7) || (!strncmp(command,"USER",4)) || (!strncmp(command,"NICK",4)) || (!strncmp(command,"PASS",4)))
			{
				/* ikky /stats counters */
				if (temp)
				{
					cm->second->use_count++;
					cm->second->total_bytes+=strlen(temp);
				}

				int MOD_RESULT = 0;
				FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true));
				if (MOD_RESULT == 1)
				{
					return;
				}

				/*
				 * WARNING: nothing may come after the
				 * command handler call, as the handler
				 * may free the user structure!
				 */

				cm->second->Handle(command_p,items,user);
				return;
			}
			else
			{
				WriteServ(user->fd,"451 %s :You have not registered",command);
				return;
			}
		}
	}
	else if (user)
	{
		ServerInstance->stats->statsUnknown++;
		WriteServ(user->fd,"421 %s %s :Unknown command",user->nick,command);
	}
}

bool CommandParser::RemoveCommands(const char* source)
{
	bool go_again = true;

	while (go_again)
	{
		go_again = false;

		for (nspace::hash_map<std::string,command_t*>::iterator i = cmdlist.begin(); i != cmdlist.end(); i++)
		{
			command_t* x = i->second;
			if (x->source == std::string(source))
			{
				log(DEBUG,"removecommands(%s) Removing dependent command: %s",x->source.c_str(),x->command.c_str());
				cmdlist.erase(i);
				go_again = true;
				break;
			}
		}
	}

	return true;
}

void CommandParser::ProcessBuffer(const char* cmdbuf,userrec *user)
{
	char cmd[MAXBUF];

	if (!user)
	{
		log(DEFAULT,"*** BUG *** process_buffer was given an invalid parameter");
		return;
	}
	if (!cmdbuf)
	{
		log(DEFAULT,"*** BUG *** process_buffer was given an invalid parameter");
		return;
	}
	if (!cmdbuf[0])
	{
		return;
	}

	while (*cmdbuf == ' ') cmdbuf++; // strip leading spaces

	strlcpy(cmd,cmdbuf,MAXBUF);

	if (!cmd[0])
	{
		return;
	}


	/* XXX - This is ugly as sin, and incomprehensible - why are we doing this twice, for instance? --w00t */
	int sl = strlen(cmd)-1;

	if ((cmd[sl] == 13) || (cmd[sl] == 10))
	{
		cmd[sl] = '\0';
	}

	sl = strlen(cmd)-1;

	if ((cmd[sl] == 13) || (cmd[sl] == 10))
	{
		cmd[sl] = '\0';
	}

	sl = strlen(cmd)-1;


	while (cmd[sl] == ' ') // strip trailing spaces
	{
		cmd[sl] = '\0';
		sl = strlen(cmd)-1;
	}

	if (!cmd[0])
	{
		return;
	}

	log(DEBUG,"CMDIN: %s %s",user->nick,cmd);
	tidystring(cmd);
	if ((user) && (cmd))
	{
		this->ProcessCommand(user,cmd);
	}
}

bool CommandParser::CreateCommand(command_t *f)
{
	/* create the command and push it onto the table */
	if (cmdlist.find(f->command) == cmdlist.end())
	{
		cmdlist[f->command] = f;
		log(DEBUG,"Added command %s (%lu parameters)",f->command.c_str(),(unsigned long)f->min_params);
		return true;
	}
	else return false;
}

CommandParser::CommandParser()
{
	this->SetupCommandTable();
}

void CommandParser::SetupCommandTable()
{
	this->CreateCommand(new cmd_user);
	this->CreateCommand(new cmd_nick);
	this->CreateCommand(new cmd_quit);
	this->CreateCommand(new cmd_version);
	this->CreateCommand(new cmd_ping);
	this->CreateCommand(new cmd_pong);
	this->CreateCommand(new cmd_admin);
	this->CreateCommand(new cmd_privmsg);
	this->CreateCommand(new cmd_info);
	this->CreateCommand(new cmd_time);
	this->CreateCommand(new cmd_whois);
	this->CreateCommand(new cmd_wallops);
	this->CreateCommand(new cmd_notice);
	this->CreateCommand(new cmd_join);
	this->CreateCommand(new cmd_names);
	this->CreateCommand(new cmd_part);
	this->CreateCommand(new cmd_kick);
	this->CreateCommand(new cmd_mode);
	this->CreateCommand(new cmd_topic);
	this->CreateCommand(new cmd_who);
	this->CreateCommand(new cmd_motd);
	this->CreateCommand(new cmd_rules);
	this->CreateCommand(new cmd_oper);
	this->CreateCommand(new cmd_list);
	this->CreateCommand(new cmd_die);
	this->CreateCommand(new cmd_restart);
	this->CreateCommand(new cmd_kill);
	this->CreateCommand(new cmd_rehash);
	this->CreateCommand(new cmd_lusers);
	this->CreateCommand(new cmd_stats);
	this->CreateCommand(new cmd_userhost);
	this->CreateCommand(new cmd_away);
	this->CreateCommand(new cmd_ison);
	this->CreateCommand(new cmd_summon);
	this->CreateCommand(new cmd_users);
	this->CreateCommand(new cmd_invite);
	this->CreateCommand(new cmd_pass);
	this->CreateCommand(new cmd_trace);
	this->CreateCommand(new cmd_whowas);
	this->CreateCommand(new cmd_connect);
	this->CreateCommand(new cmd_squit);
	this->CreateCommand(new cmd_modules);
	this->CreateCommand(new cmd_links);
	this->CreateCommand(new cmd_map);
	this->CreateCommand(new cmd_kline);
	this->CreateCommand(new cmd_gline);
	this->CreateCommand(new cmd_zline);
	this->CreateCommand(new cmd_qline);
	this->CreateCommand(new cmd_eline);
	this->CreateCommand(new cmd_loadmodule);
	this->CreateCommand(new cmd_unloadmodule);
	this->CreateCommand(new cmd_server);
	this->CreateCommand(new cmd_commands);
}