/* See LICENSE file for license details. */
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <curses.h>

#include "arg.h"
#include "config.h"

#define CONTROL(c) ((c) ^ 0x40)

char *argv0;
static char *host = DEFAULT_HOST;
static char *port = DEFAULT_PORT;
static char *password;
static char nick[32];
static char bufsrv[4096];
static char bufin[4096];
static char bufout[4096];
static char channel[256];
static time_t trespond;
static FILE *srv;
static WINDOW *viewwin;
static WINDOW *barwin;
static WINDOW *inputwin;
static int rows;
static int cols;
static int running;
static int got_sigwinch;
static int curline;

#include "util.c"

static void
pout(char *channel, char *fmt, ...) {
	static char timestr[80];
	time_t t;
	va_list ap;

	/*if (curline == rows-3) {
		wscrl(viewwin, 1);
		curline -= 1;
	}
	else
		curline++;*/

	va_start(ap, fmt);
	vsnprintf(bufout, sizeof bufout, fmt, ap);
	va_end(ap);
	t = time(NULL);
	strftime(timestr, sizeof timestr, TIMESTAMP_FORMAT, localtime(&t));
	wprintw(viewwin, "%-12s: %s %s\n", channel, timestr, bufout);
	//mvwprintw(viewwin, curline, 0, "%-12s: %s %s", channel, timestr, bufout);
	wrefresh(viewwin);
	wrefresh(inputwin);
}

static void
sout(char *fmt, ...) {
	va_list ap;

	va_start(ap, fmt);
	vsnprintf(bufsrv, sizeof bufsrv, fmt, ap);
	va_end(ap);
	fprintf(srv, "%s\r\n", bufsrv);
}

static void
privmsg(char *channel, char *msg) {
	if(channel[0] == '\0') {
		pout("", "No channel to send to");
		return;
	}
	pout(channel, "<%s> %s", nick, msg);
	sout("PRIVMSG %s :%s", channel, msg);
}

static void
parsein(char *s) {
	char c, *p;

	if(s[0] == '\0')
		return;
	skip(s, '\n');
	if(s[0] != COMMAND_PREFIX_CHARACTER) {
		privmsg(channel, s);
		return;
	}
	c = *++s;
	if(c != '\0' && isspace(s[1])) {
		p = s + 2;
		switch(c) {
		case 'j':
			sout("JOIN %s", p);
			if(channel[0] == '\0')
				strlcpy(channel, p, sizeof channel);
			return;
		case 'l':
			s = eat(p, isspace, 1);
			p = eat(s, isspace, 0);
			if(!*s)
				s = channel;
			if(*p)
				*p++ = '\0';
			if(!*p)
				p = DEFAULT_PARTING_MESSAGE;
			sout("PART %s :%s", s, p);
			return;
		case 'm':
			s = eat(p, isspace, 1);
			p = eat(s, isspace, 0);
			if(*p)
				*p++ = '\0';
			privmsg(s, p);
			return;
		case 's':
			strlcpy(channel, p, sizeof channel);
			return;
		}
	}
	sout("%s", s);
}

static void
parsesrv(char *cmd) {
	char *usr, *par, *txt;

	usr = host;
	if(!cmd || !*cmd)
		return;
	if(cmd[0] == ':') {
		usr = cmd + 1;
		cmd = skip(usr, ' ');
		if(cmd[0] == '\0')
			return;
		skip(usr, '!');
	}
	skip(cmd, '\r');
	par = skip(cmd, ' ');
	txt = skip(par, ':');
	trim(par);
	if(!strcmp("PONG", cmd))
		return;
	if(!strcmp("PRIVMSG", cmd))
		pout(par, "<%s> %s", usr, txt);
	else if(!strcmp("PING", cmd))
		sout("PONG %s", txt);
	else {
		pout(usr, ">< %s (%s): %s", cmd, par, txt);
		if(!strcmp("NICK", cmd) && !strcmp(usr, nick))
			strlcpy(nick, txt, sizeof nick);
	}
}

int getinput(char *buf, size_t sz)
{
	int ch;
	size_t ret = 0;
	static size_t pos = 0;

	wmove(inputwin, 0, pos);
	wrefresh(inputwin);
	while ((ch = getch()) != ERR) {
		switch (ch) {
			case KEY_RESIZE:
				got_sigwinch = 1;
				goto done;
			case KEY_ENTER:
			case CONTROL('M'):
				ret = pos;
				pos = 0;
				wmove(inputwin, 0, 0);
				wclrtoeol(inputwin);
				wrefresh(inputwin);
				goto done;
			case KEY_BACKSPACE:
				if (pos) {
					pos--;
					wmove(inputwin, 0, pos);
					wclrtoeol(inputwin);
					wrefresh(inputwin);
				}
				break;
			default:
				if (pos == sizeof bufin) {
					pout("", "input line too long");
					goto done;
				}
				mvwaddch(inputwin, 0, pos, ch);
				bufin[pos++] = ch;
				bufin[pos] = '\0';
				wrefresh(inputwin);
				break;
		}
	}

done:
	wrefresh(inputwin);

	return ret;
}

void gettermsize(void)
{
	struct winsize w;

	while (ioctl(STDIN_FILENO, TIOCGWINSZ, &w) == -1)
		if (errno != EINTR) {
			endwin();
			eprint("cic: failed to get term size");
		}
	rows = w.ws_row;
	cols = w.ws_col;
	wsetscrreg(viewwin, 0, rows-2);
}

void doresize(void)
{
	int ch;

	gettermsize();

	resizeterm(rows, cols);

	if ((ch = getch()) != KEY_RESIZE)
		ungetch(ch);

	wresize(viewwin, rows-2, cols);
	wmove(viewwin, 0, 0);
	wresize(barwin, 1, cols);
	wmove(barwin, rows-2, 0);
	whline(barwin, ACS_HLINE, cols);
	wresize(inputwin, 1, cols);
	wmove(inputwin, rows-1, 0);

	wrefresh(viewwin);
	wrefresh(barwin);
	wrefresh(inputwin);
}

void sigint(int unused)
{
	running = 0;
}

void sigwinch(int unused)
{
	got_sigwinch = 1;
}


static void
usage(void) {
	eprint("usage: cic [-h host] [-p port] [-n nick] [-k keyword] [-v]\n", argv0);
}

int
main(int argc, char *argv[]) {
	struct sigaction sa;
	struct timeval tv;
	const char *user = getenv("USER");
	int n;
	fd_set rd;

	if (!isatty(STDIN_FILENO))
		eprint("cic: stdin is not a terminal");
	if (!isatty(STDOUT_FILENO))
		eprint("cic: stdout is not a terminal");

	strlcpy(nick, user ? user : "unknown", sizeof nick);
	ARGBEGIN {
	case 'h':
		host = EARGF(usage());
		break;
	case 'p':
		port = EARGF(usage());
		break;
	case 'n':
		strlcpy(nick, EARGF(usage()), sizeof nick);
		break;
	case 'k':
		password = EARGF(usage());
		break;
	case 'v':
		eprint("cic-"VERSION", © 2005-2014 Kris Maglione, Anselm R. Garbe, Nico Golde, John Vogel\n");
		break;
	default:
		usage();
	} ARGEND;

	/* signals init */
	sa.sa_handler = sigint;
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_RESTART;
	sigaction(SIGINT, &sa, NULL);
	sigaction(SIGTERM, &sa, NULL);
	sigaction(SIGQUIT, &sa, NULL);
	sa.sa_handler = sigwinch;
	sigaction(SIGWINCH, &sa, NULL);

	srv = fdopen(dial(host, port), "r+");
	if (!srv) {
		endwin();
		eprint("fdopen:");
	}
	/* login */
	if(password)
		sout("PASS %s", password);
	sout("NICK %s", nick);
	sout("USER %s localhost %s :%s", nick, host, nick);
	fflush(srv);
	setbuf(srv, NULL);
	
	/* curses init */
	initscr();
	cbreak();
	noecho();
	nonl();
	intrflush(stdscr, FALSE);
	keypad(stdscr, TRUE);
	curs_set(1);
	timeout(0);
	refresh();

	gettermsize();

	viewwin = newwin(rows - 2, cols, 0, 0);
	idlok(viewwin, TRUE);
	scrollok(viewwin, TRUE);
	barwin = newwin(1, cols, rows - 2, 0);
	whline(barwin, ACS_HLINE, cols);
	inputwin = newwin(1, cols, rows - 1, 0);
	wrefresh(viewwin);
	wrefresh(barwin);
	wrefresh(inputwin);

	running = 1;
	got_sigwinch = 0;
	while (running) { /* main loop */
		if (got_sigwinch) {
			doresize();
			got_sigwinch = 0;
		}
		FD_ZERO(&rd);
		FD_SET(0, &rd);
		FD_SET(fileno(srv), &rd);
		tv.tv_sec = 120;
		tv.tv_usec = 0;
		n = select(fileno(srv) + 1, &rd, 0, 0, &tv);
		if(n < 0) {
			if(errno == EINTR)
				continue;
			endwin();
			eprint("cic: error on select():");
		}
		else if(n == 0) {
			if(time(NULL) - trespond >= 300) {
				endwin();
				eprint("cic shutting down: parse timeout\n");
			}
			sout("PING %s", host);
			continue;
		}
		if(FD_ISSET(fileno(srv), &rd)) {
			if(fgets(bufsrv, sizeof bufin, srv) == NULL) {
				endwin();
				eprint("cic: remote host closed connection\n");
			}
			parsesrv(bufsrv);
			trespond = time(NULL);
		}
		if(FD_ISSET(0, &rd)) {
			if (getinput(bufin, sizeof bufin) > 0)
				parsein(bufin);
		}
	}

	endwin();
	return 0;
}