/* This file is part of Netsukuku
 *
 * This source code 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 source code 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.
 * Please refer to the GNU Public License for more details.
 *
 * You should have received a copy of the GNU Public License along with
 * this source code; if not, write to:
 * Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */


#include "ntk-console.h"
#include "console.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <time.h>
#include <unistd.h>


const struct supported_commands {
	command_t 		id;
	const char* 	command;
	const char* 	help;
	int 			arguments;
} kSupportedCommands[] = {
	{COMMAND_HELP, 		"help", 			"Shows console help", 0},
	{COMMAND_UPTIME, 	"uptime", 			"Returns the time when ntkd finished the hooking", 0},
	{COMMAND_KILL, 		"kill", 			"Kills the running instance of netsukuku with SIGINT", 0},
	{COMMAND_VERSION, 	"version", 			"Shows the running version of the ntk-console, and ntkd.", 0},
	{COMMAND_INETCONN, 	"inet_connected", 	"Query if Ntkd is connected to the internet", 0},
	{COMMAND_CURIFS, 	"cur_ifs", 			"Lists all of the interfaces in cur_ifs", 0},
	{COMMAND_CURIFSCT, 	"cur_ifs_n", 		"Lists the number of interfaces present in `cur_ifs`", 0},
	{COMMAND_CURQSPNID, "cur_qspn_id", 		"The current qspn_id we are processing. It is cur_qspn_id[levels] big", 0},
	{COMMAND_CURIP, 	"cur_ip", 			"Current IP address", 0},
	{COMMAND_CURNODE,	"cur_node", 		"Current node", 0},
	{COMMAND_IFS, 		"ifs", 				"List all the interfaces in server_opt.ifs", 0},
	{COMMAND_IFSCT, 	"ifs_n", 			"List the number of interfaces present in server_opt.ifs", 0},
	{COMMAND_QUIT, 		"quit", 			"Exit the console", 0},
	{COMMAND_CONSUPTIME,"console_uptime", 	"Get the uptime of this console", 0},
};


command_t
command_parse(char *request)
{
	if (strlen(request) > CONSOLE_BUFFER_LENGTH) {
		printf("Error: Command longer than 250 bytes.\n");
		return -1;
	}

	for (int i = 0; i < sizeof(kSupportedCommands)
		/ sizeof(kSupportedCommands[0]); i++) {
		if (strncmp(request, kSupportedCommands[i].command,
			(int)strlen(request) - 1) == 0) {
			return kSupportedCommands[i].id;
		}
	}

	printf("Incorrect or unreadable command, Please correct it.\n");
	return -1;
}


static int
request_receive(int sock, char message[], int max)
{
	int total = 0;
	const int bsize = 1024;
	char buffer[bsize+1];
	int read = bsize;
	
	message[0] = 0; // initialize for strcat()
	
	while(read == bsize) {
		read = recv(sock, buffer, bsize, 0);
		if(read < 0)
		    return -1; // error, bail out
		total += read;
		if(total > max)
		    return -2; // overflow
		buffer[read] = 0;
		strcat(message, buffer);
	}

    return total;
}


/* Sends and receives to ntkd */
void
ntkd_request(command_t command)
{
	if (sockfd <= 0) {
		perror("ntkd connection closed unexpectedly!\n");
		exit(-1);
	}

	cmd_packet_t packetOut;
	packetOut.command = command;

	rc = send(sockfd, &packetOut, sizeof(packetOut), 0);
	if (rc < sizeof(packetOut)) {
		perror("send() failed");
		exit(-1);
	}

	char response[CONSOLE_BUFFER_LENGTH];
	request_receive(sockfd, response, CONSOLE_BUFFER_LENGTH);
	if (rc < 0) {
		perror("recv() failed");
		exit(-1);
	}

	printf("Response: %s\n", response);
}


void
opensocket(void)
{
	sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
	if (sockfd < 0) {
		 perror("socket creation failed");
		 exit(-1);
	}
	
	memset(&serveraddr, 0, sizeof(serveraddr));
	serveraddr.sun_family = AF_UNIX;
	strcpy(serveraddr.sun_path, CONSOLE_SOCKET_PATH);

	rc = connect(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
	if (rc < 0) {
		perror("connect() failed");
		printf("Unable to connect to ntk daemon console.\n");
		exit(-1);
	}
	printf("ntkd console connection opened successfully.\n");
}


void
closesocket(void)
{
    const int optVal = 1;
    const socklen_t optLen = sizeof(optVal);

    setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (void*) &optVal, optLen);

	if (sockfd >= 0)
		close(sockfd);

	printf("ntkd console connection closed.\n");
}


void
console_uptime(void)
{
	int uptime_sec1;
	int uptime_min1;
	int uptime_hour1;
	
	int uptime_day1;
	int uptime_month1;
	int uptime_year1;
	
	time(&rawtime);
	
	timeinfo = localtime(&rawtime);
	
	uptime_sec1 = timeinfo->tm_sec;
	uptime_min1 = timeinfo->tm_min;
	uptime_hour1 = timeinfo->tm_hour;
	
	uptime_day1 = timeinfo->tm_mday;
	uptime_month1 = timeinfo->tm_mon;
	uptime_year1 = timeinfo->tm_year;
	
	uptime_sec1 -= uptime_sec;
	uptime_min1 -= uptime_min;
	uptime_hour1 -= uptime_hour;
	
	uptime_day1 -= uptime_day;
	uptime_month1 -= uptime_month;
	uptime_year1 -= uptime_year;
	
	printf("Total Uptime is: %i Year(s), %i Month(s), %i Day(s), %i Hour(s), %i Minute(s), %i Second(s)\n",
		uptime_year1, uptime_month1, uptime_day1, uptime_hour1, uptime_min1, uptime_sec1);
}


static void
millisleep(unsigned ms)
{
	usleep(1000 * ms);
}


void
console(char* request)
{
	command_t commandID = command_parse(request);

	switch (commandID) {
		case COMMAND_QUIT:
			closesocket();
			exit(0);
			break;
		case COMMAND_UPTIME:
		case COMMAND_INETCONN:
		case COMMAND_CURIFS:
		case COMMAND_CURIFSCT:
		case COMMAND_CURQSPNID:
		case COMMAND_CURIP:
		case COMMAND_CURNODE:
		case COMMAND_IFS:
		case COMMAND_IFSCT:
			ntkd_request(commandID);
			millisleep(200);
			break;
		case COMMAND_VERSION:
			printf("ntk-console version: %d.%d\n",
				CONSOLE_VERSION_MAJOR, CONSOLE_VERSION_MINOR);
			ntkd_request(commandID);
			break;
		case COMMAND_CONSUPTIME:
			console_uptime();
			break;
		case COMMAND_KILL:
			closesocket();
			system("ntkd -k");
			break;
		case COMMAND_HELP:
		default:
			usage();
	}
}


int
main(void)
{
	time(&rawtime);
	
	timeinfo = localtime(&rawtime);
	
	uptime_sec = timeinfo->tm_sec;
	uptime_min = timeinfo->tm_min;
	uptime_hour = timeinfo->tm_hour;
	uptime_day = timeinfo->tm_mday;
	uptime_month = timeinfo->tm_mon;
	uptime_year = timeinfo->tm_year;
	
	opensocket();

	printf("This is the Netsukuku Console. Please type 'help' for more information.\n");
	for(;;) {
		char* request = (char*)malloc(CONSOLE_BUFFER_LENGTH);
		printf("\n> ");
		fgets(request, 16, stdin);
		fflush(stdin);
		console(request);
		free(request);
	}
	closesocket();

	return 0;
}

void usage(void) {
	printf("Usage:\n");
	for (int i = 0; i < sizeof(kSupportedCommands)
		/ sizeof(kSupportedCommands[0]); i++) {
		printf("  %16s - %s\n", kSupportedCommands[i].command, kSupportedCommands[i].help);
	}
}