/*
 * Copyright (C) 1998-2009 Andre Noll <maan@systemlinux.org>
 *
 * Licensed under the GPL v2. For licencing details see COPYING.
 */

/** \file gui.c Curses-based interface for paraslash. */

#include <signal.h>
#include <sys/types.h>
#include <dirent.h>
#include "gui.cmdline.h"
#include "para.h"
#include "gui.h"
#include "string.h"
#include <curses.h>
#include "ringbuffer.h"
#include "fd.h"
#include "error.h"
#include "list.h"
#include "sched.h"
#include "signal.h"

/** define the array of error lists needed by para_gui */
INIT_GUI_ERRLISTS;
static char *stat_content[NUM_STAT_ITEMS];

#define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"

static int signal_pipe;

static struct win_data {
	WINDOW *win;
	NCURSES_SIZE_T begx;
	NCURSES_SIZE_T begy;
	NCURSES_SIZE_T cols;
	NCURSES_SIZE_T lines;
} top, bot, sb, in, sep;

#define RINGBUFFER_SIZE 512
struct rb_entry {
	char *msg;
	size_t len;
	int color;
};
struct ringbuffer *bot_win_rb;
#define NUM_LINES(len) (1 + (len) / bot.cols)

static unsigned scroll_position;

static int cmd_died, curses_active;
static pid_t cmd_pid;

static int command_pipe = -1;
static int audiod_pipe = -1;
static struct gui_args_info conf;

enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};


#define COLOR_STATUSBAR 52
#define COLOR_COMMAND 53
#define COLOR_OUTPUT 54
#define COLOR_MSG 55
#define COLOR_ERRMSG 56
#define COLOR_WELCOME 57
#define COLOR_SEPARATOR 58
#define COLOR_TOP 59
#define COLOR_BOT 60

struct gui_command {
	const char *key;
	const char *name;
	const char *description;
	void (*handler)(void);
};

struct stat_item {
	char name[MAXLINE];
	char prefix[MAXLINE];
	char postfix[MAXLINE];
	unsigned y;
	unsigned x;
	unsigned len;
	int fg, bg;
	int align;
	char content[MAXLINE];
};

static struct gui_theme theme;

int _argc;
char **_argv;

static void com_help(void);
static void com_reread_conf(void);
static void com_enlarge_top_win(void);
static void com_shrink_top_win(void);
static void com_version(void);
static void com_quit(void);
static void com_refresh(void);
static void com_ll_incr(void);
static void com_ll_decr(void);
static void com_prev_theme(void);
static void com_next_theme(void);
static void com_scroll_up(void);
static void com_scroll_down(void);
static void com_page_up(void);
static void com_page_down(void);

struct gui_command command_list[] = {
	{
		.key = "?",
		.name = "help",
		.description = "print help",
		.handler = com_help
	}, {
		.key = "+",
		.name = "enlarge_win",
		.description = "enlarge the top window",
		.handler = com_enlarge_top_win
	}, {
		.key = "-",
		.name = "shrink_win",
		.description = "shrink the top window",
		.handler = com_shrink_top_win
	}, {
		.key = "r",
		.name = "reread_conf",
		.description = "reread configuration file",
		.handler = com_reread_conf
	}, {
		.key = "q",
		.name = "quit",
		.description = "exit para_gui",
		.handler = com_quit
	}, {
		.key = "^L",
		.name = "refresh",
		.description = "redraw the screen",
		.handler = com_refresh
	}, {
		.key = ".",
		.name = "next_theme",
		.description = "switch to next theme",
		.handler = com_next_theme
	}, {
		.key = ",",
		.name = "prev_theme",
		.description = "switch to previous stream",
		.handler = com_prev_theme
	}, {
		.key = ">",
		.name = "ll_incr",
		.description = "increase loglevel (decreases verbosity)",
		.handler = com_ll_incr
	}, {
		.key = "<",
		.name = "ll_decr",
		.description = "decrease loglevel (increases verbosity)",
		.handler = com_ll_decr
	}, {
		.key = "V",
		.name = "version",
		.description = "show the para_gui version",
		.handler = com_version
	}, {
		.key = "<up>",
		.name = "scroll_up",
		.description = "scroll up one line",
		.handler = com_scroll_up
	}, {
		.key = "<down>",
		.name = "scroll_down",
		.description = "scroll down one line",
		.handler = com_scroll_down
	}, {
		.key = "<ppage>",
		.name = "page_up",
		.description = "scroll up one page",
		.handler = com_page_up
	}, {
		.key = "<npage>",
		.name = "page_down",
		.description = "scroll down one page",
		.handler = com_page_down
	}, {
		.handler = NULL
	}
};

static int para_open_audiod_pipe(char *cmd)
{
	int fds[3] = {0, 1, 0};
	pid_t pid;
	int ret = para_exec_cmdline_pid(&pid, cmd, fds);
	if (ret < 0)
		return ret;
	ret = mark_fd_nonblocking(fds[1]);
	if (ret > 0)
		return fds[1];
	close(fds[1]);
	return ret;
}

static int read_audiod_pipe(int fd, line_handler_t *line_handler)
{
	static char buf[4096];
	const ssize_t bufsize = sizeof(buf) - 1;
	static ssize_t loaded;
	ssize_t ret;

	if (loaded >= bufsize)
		loaded = 0;
	ret = read(fd, buf + loaded, bufsize - loaded);
	if (ret > 0) {
		loaded += ret;
		buf[loaded] = '\0';
		loaded = for_each_line(buf, loaded, line_handler, NULL);
	}
	return ret;
}

static int find_cmd_byname(char *name)
{
	int i;

	for (i = 0; command_list[i].handler; i++)
		if (!strcmp(command_list[i].name, name))
			return i;
	return -1;
}

/* taken from mutt */
static char *km_keyname(int c)
{
	static char buf[10];

	if (c == KEY_UP) {
		sprintf(buf, "<up>");
		return buf;
	}
	if (c == KEY_DOWN) {
		sprintf(buf, "<down>");
		return buf;
	}
	if (c == KEY_LEFT) {
		sprintf(buf, "<left>");
		return buf;
	}
	if (c == KEY_RIGHT) {
		sprintf(buf, "<right>");
		return buf;
	}
	if (c == KEY_NPAGE) {
		sprintf(buf, "<npage>");
		return buf;
	}
	if (c == KEY_PPAGE) {
		sprintf(buf, "<ppage>");
		return buf;
	}
	if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
		if (c < 0)
			c += 256;
		if (c < 128) {
			buf[0] = '^';
			buf[1] = (c + '@') & 0x7f;
			buf[2] = 0;
		} else
			snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
				(c >> 3) & 7, c & 7);
	} else if (c >= KEY_F0 && c < KEY_F(256))
		sprintf(buf, "<F%d>", c - KEY_F0);
	else if (isprint(c))
		snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
	else
		snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
	return buf;
}

static char *configfile_exists(void)
{
	static char *config_file;
	char *tmp;

	if (!conf.config_file_given) {
		if (!config_file) {
			char *home = para_homedir();
			config_file = make_message("%s/.paraslash/gui.conf",
				home);
			free(home);
		}
		tmp = config_file;
	} else
		tmp = conf.config_file_arg;
	return file_exists(tmp)? tmp: NULL;
}

/*
 * print num spaces to curses window
 */
static void add_spaces(WINDOW* win, unsigned int num)
{
	while (num > 0) {
		num--;
		waddstr(win, " ");
	}
}

/*
 * print aligned string to curses window. This function always prints
 * exactly len chars.
 */
static int align_str(WINDOW* win, const char *string, unsigned int len,
		unsigned int align)
{
	int num; /* of spaces */
	char *str;

	if (!win || !string)
		return -1;
	num = len - strlen(string);
	str = para_strdup(string);
	if (num < 0) {
		str[len] = '\0';
		num = 0;
	}
	if (align == LEFT) {
		waddstr(win, str);
		add_spaces(win, num);
	} else if (align == RIGHT) {
		add_spaces(win, num);
		waddstr(win, str);
	} else {
		add_spaces(win, num / 2);
		waddstr(win, str[0]? str: "");
		add_spaces(win, num - num / 2);
	}
	free(str);
	return 1;
}

__printf_2_3 static void print_in_bar(int color, const char *fmt,...)
{
	char *msg;

	if (!curses_active)
		return;
	wattron(in.win, COLOR_PAIR(color));
	PARA_VSPRINTF(fmt, msg);
	wmove(in.win, 0, 0);
	align_str(in.win, msg, sb.cols, LEFT);
	free(msg);
	wrefresh(in.win);
}

/*
 * update the status bar
 */
static void print_status_bar(void)
{
	if (!curses_active)
		return;
	wmove(sb.win, 0, 0);
	align_str(sb.win, STANDARD_STATUS_BAR, sb.cols, CENTER);
	wrefresh(sb.win);
}

/*
 * get the number of the oldest rbe that is (partially) visible. On return,
 * lines contains the sum of the number of lines of all visable entries. If the
 * first one is only partially visible, lines is greater than bot.lines.
 */
static int first_visible_rbe(unsigned *lines)
{
	int i;
	*lines = 0;
	for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
		struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
		int rbe_lines;
		if (!rbe)
			return i - 1;
//		fprintf(stderr, "found: %s\n", rbe->msg);
		rbe_lines = NUM_LINES(rbe->len);
		if (rbe_lines > bot.lines)
			return -1;
		*lines += rbe_lines;
		if (*lines >= bot.lines)
			return i;
	}
	return RINGBUFFER_SIZE - 1;
}

static int draw_top_rbe(unsigned *lines)
{
	unsigned len;
	int offset, fvr = first_visible_rbe(lines);
	struct rb_entry *rbe;

	if (fvr < 0)
		return -1;
	wmove(bot.win, 0, 0);
	rbe = ringbuffer_get(bot_win_rb, fvr);
	if (!rbe)
		return -1;
	/* first rbe might be only partially visible */
	offset = (*lines - bot.lines) * bot.cols;
	len = strlen(rbe->msg);
	if (offset < 0 || len < offset)
		return -1;
	wattron(bot.win, COLOR_PAIR(rbe->color));
	waddstr(bot.win, rbe->msg + offset);
	*lines = NUM_LINES(len - offset);
	return fvr;
}

static void redraw_bot_win(void)
{
	unsigned lines;
	int i;

	wmove(bot.win, 0, 0);
	wclear(bot.win);
	i = draw_top_rbe(&lines);
	if (i <= 0)
		goto out;
	while (i > 0 && lines < bot.lines) {
		struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
		if (!rbe) {
			lines++;
			waddstr(bot.win, "\n");
			continue;
		}
		lines += NUM_LINES(rbe->len);
		wattron(bot.win, COLOR_PAIR(rbe->color));
		waddstr(bot.win, "\n");
		waddstr(bot.win, rbe->msg);
	}
out:
	wrefresh(bot.win);
}

static void rb_add_entry(int color, char *msg)
{
	struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
	int x, y;
	new->color = color;
	new->len = strlen(msg);
	new->msg = msg;
	old = ringbuffer_add(bot_win_rb, new);
//	fprintf(stderr, "added: %s\n", new->msg);
	if (old) {
		free(old->msg);
		free(old);
	}
	if (scroll_position) {
		/* discard current scrolling, like xterm does */
		scroll_position = 0;
		redraw_bot_win();
		return;
	}
	wattron(bot.win, COLOR_PAIR(color));
	getyx(bot.win, y, x);
	if (y || x)
		waddstr(bot.win, "\n");
	waddstr(bot.win, msg);
}

/*
 * print formated output to bot win and refresh
 */
__printf_2_3 static void outputf(int color, const char* fmt,...)
{
	char *msg;

	if (!curses_active)
		return;
	PARA_VSPRINTF(fmt, msg);
	rb_add_entry(color, msg);
	wrefresh(bot.win);
}

static int add_output_line(char *line, __a_unused void *data)
{
	if (!curses_active)
		return 1;
	rb_add_entry(COLOR_OUTPUT, para_strdup(line));
	return 1;
}

static int loglevel;

__printf_2_3 void para_log(int ll, const char *fmt,...)
{
	int color;
	char *msg;

	if (ll < loglevel || !curses_active)
		return;
	switch (ll) {
		case LL_DEBUG:
		case LL_INFO:
		case LL_NOTICE:
			color = COLOR_MSG;
			break;
		default:
			color = COLOR_ERRMSG;
	}
	PARA_VSPRINTF(fmt, msg);
	chop(msg);
	rb_add_entry(color, msg);
	wrefresh(bot.win);
}

static void setup_signal_handling(void)
{
	signal_pipe = para_signal_init();
	para_install_sighandler(SIGINT);
	para_install_sighandler(SIGTERM);
	para_install_sighandler(SIGCHLD);
	para_install_sighandler(SIGWINCH);
	para_install_sighandler(SIGUSR1);
	para_sigaction(SIGHUP, SIG_IGN);
}

__noreturn static void do_exit(int ret)
{
	para_sigaction(SIGTERM, SIG_IGN);
	kill(0, SIGTERM);
	exit(ret);
}

static void shutdown_curses(void)
{
	if (!curses_active)
		return;
	def_prog_mode();
	curses_active = 0;
	endwin();
}

__noreturn static void finish(int ret)
{
	shutdown_curses();
	do_exit(ret);
}

/*
 * exit curses and print given message to stdout/stderr
 */
__noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
{
	va_list argp;
	FILE *outfd = ret? stderr: stdout;

	shutdown_curses();
	va_start(argp, fmt);
	vfprintf(outfd, fmt, argp);
	va_end(argp);
	do_exit(ret);
}

static void print_welcome(void)
{
	if (loglevel > LL_NOTICE)
		return;
	outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
		" \"" CODENAME "\". Theme: %s", theme.name);
	wclrtoeol(bot.win);
}

/*
 * init all windows
 */
static void init_wins(int top_lines)
{
	int i;

	top.lines = top_lines;
	top.cols = COLS;
	top.begy = 0;
	top.begx = 0;

	bot.lines = LINES - top.lines - 3;
	bot.cols = COLS;
	bot.begy = top.lines + 1;
	bot.begx = 0;

	sb.lines = 1;
	sb.cols = COLS;
	sb.begy = LINES - 2;
	sb.begx = 0;

	in.lines = 1;
	in.cols = COLS;
	in.begy = LINES - 1;
	in.begx = 0;

	sep.lines = 1;
	sep.cols = COLS;
	sep.begy = top.lines;
	sep.begx = 0;

	assume_default_colors(theme.default_fg, theme.default_bg);
	if (top.win) {
		mvwin(top.win, top.begy, top.begx);
		wresize(top.win, top.lines, top.cols);

		mvwin(sb.win, sb.begy, sb.begx);
		wresize(sb.win, sb.lines, sb.cols);

		mvwin(sep.win, sep.begy, sep.begx);
		wresize(sep.win, sep.lines, sep.cols);

		mvwin(bot.win, bot.begy, bot.begx);
		wresize(bot.win, bot.lines, bot.cols);

		mvwin(in.win, in.begy, in.begx);
		wresize(in.win, in.lines, in.cols);
	} else {
		sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
		top.win = newwin(top.lines, top.cols, top.begy, top.begx);
		bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
		sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
		in.win = newwin(in.lines, in.cols, in.begy, in.begx);
		if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
			msg_n_exit(1, "Error: Cannot create curses windows\n");
		wclear(bot.win);
		wclear(sb.win);
		wclear(in.win);
		scrollok(bot.win, 1);
		wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
		wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
		wattron(bot.win, COLOR_PAIR(COLOR_BOT));
		wattron(top.win, COLOR_PAIR(COLOR_TOP));
		nodelay(top.win, 1);
		nodelay(bot.win, 1);
		nodelay(sb.win, 1);
		nodelay(in.win, 0);

		keypad(top.win, 1);
		keypad(bot.win, 1);
		keypad(sb.win, 1);
		keypad(in.win, 1);
		print_status_bar();
	}
	wmove(sep.win, 0, 0);
	for (i = 1; i <= COLS; i++)
		waddstr(sep.win, theme.sep_str);
	wclear(top.win);
	//wclear(bot.win);
	wnoutrefresh(top.win);
	wnoutrefresh(bot.win);
	//wnoutrefresh(sb.win);
	print_status_bar();
	wnoutrefresh(in.win);
	wnoutrefresh(sep.win);
	doupdate();
}

static void check_geometry(void)
{
	if (LINES < theme.lines_min || COLS < theme.cols_min)
		msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
			" (need at least %dx%d)\n", COLS, LINES,
			theme.cols_min, theme.lines_min);
}

/*
 * Print stat item #i to curses window
 */
static void print_stat_item(int i)
{
	char *tmp;
	struct stat_item_data d = theme.data[i];
	char *c = stat_content[i];

	if (!curses_active || !d.len || !c)
		return;
	tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
	wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
	wrefresh(top.win);
	wattron(top.win, COLOR_PAIR(i + 1));
	align_str(top.win, tmp, d.len * COLS / 100, d.align);
	free(tmp);
	wrefresh(top.win);
}

static void print_all_items(void)
{
	int i;

	if (!curses_active)
		return;
	FOR_EACH_STATUS_ITEM(i)
		print_stat_item(i);
}

static void clear_all_items(void)
{
	int i;

	FOR_EACH_STATUS_ITEM(i) {
		free(stat_content[i]);
		stat_content[i] = para_strdup("");
	}
}

static void init_colors(void)
{
	int i;

	if (!has_colors())
		msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
	start_color();
	FOR_EACH_STATUS_ITEM(i)
		if (theme.data[i].len)
			init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
	init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
	init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
	init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
	init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
	init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
	init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
	init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
	init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
	init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
}

/*
 * (re-)initialize the curses library  FIXME: Error checking
 */
static void init_curses(void)
{
	curses_active = 1;
	if (top.win && refresh() == ERR) { /* refesh is really needed */
		msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
	}
	check_geometry();
	curs_set(0); /* make cursor invisible, ignore errors */
//	if (noraw() == ERR);
//		msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
//			"raw mode\n");
	nonl(); /* tell curses not to do NL->CR/NL on output */
	noecho(); /* don't echo input */
	cbreak(); /* take input chars one at a time, no wait for \n */
	//reset_prog_mode();
	init_colors();
	clear();
	init_wins(theme.top_lines_default);
	print_all_items();
	noecho(); /* don't echo input */
}


static void check_sigchld(void)
{
	int ret;
	pid_t pid;
reap_next_child:
	ret = para_reap_child(&pid);
	if (ret <= 0)
		return;
	if (pid == cmd_pid) {
		cmd_pid = 0;
		cmd_died = 1;
	}
	goto reap_next_child;
}

/*
 * print status line if line starts with known command.
 */
static int check_stat_line(char *line, __a_unused void *data)
{
	int i;

//	PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
	i = stat_line_valid(line);
	if (i >= 0) {
		line += strlen(status_item_list[i]) + 1;
		if (*line == ' ')
			line++;
		free(stat_content[i]);
		stat_content[i] = para_strdup(line);
		print_stat_item(i);
	}
	return 1;
}

/*
 * This sucker modifies its first argument. *handler and *arg are
 * pointers to 0-terminated strings (inside line). Crap.
 */
static int split_key_map(char *line, char **handler, char **arg)
{
	if (!(*handler = strchr(line + 1, ':')))
		goto err_out;
	**handler = '\0';
	(*handler)++;
	if (!(*arg = strchr(*handler, ':')))
		goto err_out;
	**arg = '\0';
	(*arg)++;
	return 1;
err_out:
	return 0;
}

static int check_key_map_args(void)
{
	char *s;
	int i, ret = -1;
	char *tmp = NULL, *handler, *arg;

	for (i = 0; i < conf.key_map_given; ++i) {
		s = conf.key_map_arg[i];
		if (!(*s))
			goto err_out;
		free(tmp);
		tmp = para_strdup(s);
		if (!split_key_map(tmp, &handler, &arg))
			goto err_out;
		if (strlen(handler) != 1)
			goto err_out;
		if (*handler != 'x'
			&& *handler != 'd'
			&& *handler != 'i'
			&& *handler != 'p')
			goto err_out;
		if (*handler != 'i')
			continue;
		if (find_cmd_byname(arg) < 0)
			goto err_out;
	}
	ret = 0;
err_out:
	free(tmp);
	return ret;
}

/*
 * React to various signal-related events
 */
static void handle_signal(int sig)
{
	switch (sig) {
	case SIGTERM:
		msg_n_exit(EXIT_FAILURE,
			"only the good die young (caught SIGTERM))\n");
		return;
	case SIGWINCH:
		if (curses_active) {
			shutdown_curses();
			init_curses();
			redraw_bot_win();
		}
		return;
	case SIGINT:
		PARA_WARNING_LOG("caught SIGINT, reset");
		/* Nothing to do. SIGINT killed our child, para_client stat.
		 * This get noticed by do_select which resets everything
		 */
		return;
	case SIGUSR1:
		PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
		com_reread_conf();
		return;
	case SIGCHLD:
		check_sigchld();
		return;
	}
}

static int open_audiod_pipe(void)
{
	static int init = 1;

	if (init)
		init = 0;
	else
		/*
		 * Sleep a bit to avoid a busy loop. As the call to sleep() may
		 * be interrupted by SIGCHLD, we simply wait until the call
		 * succeeds.
		 */
		while (sleep(2))
			; /* nothing */
	return para_open_audiod_pipe(conf.stat_cmd_arg);
}

/*
 * This is the core select loop. Besides the (internal) signal
 * pipe, the following other fds are checked according to the mode:
 *
 * GETCH_MODE: check stdin, return when key is pressed
 *
 * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 * of output has been read or when other end has closed command pipe or
 * when any key is pressed.
 *
 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 * is running. During that time curses is disabled.  Returns when
 * cmd_pid == 0.
 */
static int do_select(int mode)
{
	fd_set rfds;
	int ret;
	int max_fileno, cp_numread = 1;
	char command_buf[4096] = "";
	int cbo = 0; /* command buf offset */
	struct timeval tv;
repeat:
	tv.tv_sec = conf.timeout_arg  / 1000;
	tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
//	ret = refresh_status();
	FD_ZERO(&rfds);
	max_fileno = 0;
	/* audiod pipe */
	if (audiod_pipe < 0)
		audiod_pipe = open_audiod_pipe();
	if (audiod_pipe >= 0)
		para_fd_set(audiod_pipe, &rfds, &max_fileno);
	/* signal pipe */
	para_fd_set(signal_pipe, &rfds, &max_fileno);
	/* command pipe only for COMMAND_MODE */
	if (command_pipe >= 0 && mode == COMMAND_MODE)
		para_fd_set(command_pipe, &rfds, &max_fileno);
	ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
	if (ret <= 0)
		goto check_return; /* skip fd checks */
	/* signals */
	if (FD_ISSET(signal_pipe, &rfds)) {
		int sig_nr = para_next_signal();
		if (sig_nr > 0)
			handle_signal(sig_nr);
	}
	/* read command pipe if ready */
	if (command_pipe >= 0 && mode == COMMAND_MODE &&
			FD_ISSET(command_pipe, &rfds)) {
		cp_numread = read(command_pipe, command_buf + cbo,
			sizeof(command_buf) - 1 - cbo);
		if (cp_numread >= 0)
			cbo += cp_numread;
		else {
			if (cp_numread < 0)
				PARA_ERROR_LOG("read error (%d)", cp_numread);
			close(command_pipe);
			command_pipe = -1;
		}
	}
	if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
		if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
			close(audiod_pipe);
			audiod_pipe = -1;
			clear_all_items();
			free(stat_content[SI_BASENAME]);
			stat_content[SI_BASENAME] =
				para_strdup("audiod not running!?");
			print_all_items();
		}
check_return:
	switch (mode) {
	case COMMAND_MODE:
		if (cp_numread <= 0 && !cbo) /* command complete */
			return 0;
		if (cbo)
			cbo = for_each_line(command_buf, cbo,
				&add_output_line, NULL);
		if (cp_numread <= 0)
			cbo = 0;
		wrefresh(bot.win);
		ret = wgetch(top.win);
		if (ret != ERR && ret != KEY_RESIZE) {
			if (command_pipe) {
				close(command_pipe);
				command_pipe = -1;
			}
			if (cmd_pid)
				kill(cmd_pid, SIGTERM);
			return -1;
		}
		break;
	case GETCH_MODE:
		ret = wgetch(top.win);
		if (ret != ERR && ret != KEY_RESIZE)
			return ret;
		break;
	case EXTERNAL_MODE:
		if (cmd_died) {
			cmd_died = 0;
			return 0;
		}
	}
	goto repeat;
}

/*
 * read from command pipe and print data to bot window
 */
static int send_output(void)
{
	int ret;

	if (command_pipe < 0)
		return 0;
	ret = mark_fd_nonblocking(command_pipe);
	if (ret < 0) {
		close(command_pipe);
		return ret;
	}
	if (do_select(COMMAND_MODE) >= 0)
		PARA_INFO_LOG("command complete");
	else
		PARA_NOTICE_LOG("command aborted");
	print_in_bar(COLOR_MSG, " ");
	return 1;
}

static int client_cmd_cmdline(char *cmd)
{
	int ret, fds[3] = {0, 1, 0};
	char *c = make_message(BINDIR "/para_client -- %s", cmd);

	outputf(COLOR_COMMAND, "%s", c);
	print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
	ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
	free(c);
	if (ret < 0)
		return -1;
	command_pipe = fds[1];
	return send_output();
}

/*
 * exec command and print output to bot win
 */
static int display_cmd(char *cmd)
{
	int fds[3] = {0, 1, 0};

	print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
	outputf(COLOR_COMMAND, "%s", cmd);
	if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
		return -1;
	command_pipe = fds[1];
	return send_output();
}

/*
 * shutdown curses and stat pipe before executing external commands
 */
static int external_cmd(char *cmd)
{
	int fds[3] = {-1, -1, -1};

	if (cmd_pid)
		return -1;
	shutdown_curses();
	para_exec_cmdline_pid(&cmd_pid, cmd, fds);
	cmd_died = 0;
	do_select(EXTERNAL_MODE);
	init_curses();
	return 0;
}

static void print_scroll_msg(void)
{
	unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
	int first_rbe = first_visible_rbe(&lines_total);
	print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
		filled - scroll_position, ringbuffer_filled(bot_win_rb));
}

static void com_page_down(void)
{
	unsigned lines = 0;
	int i = scroll_position;
	while (lines < bot.lines && --i > 0) {
		struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
		if (!rbe)
			break;
		lines += NUM_LINES(strlen(rbe->msg));
	}
	if (lines) {
		scroll_position = i;
		redraw_bot_win();
		print_scroll_msg();
		return;
	}
	print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
}

static void com_page_up(void)
{
	unsigned lines;
	int fvr = first_visible_rbe(&lines);

	if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
		print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
		return;
	}
	scroll_position = fvr + 1;
	for (; scroll_position > 0; scroll_position--) {
		first_visible_rbe(&lines);
		if (lines == bot.lines)
			break;
	}
	redraw_bot_win();
	print_scroll_msg();
}

static void com_scroll_down(void)
{
	struct rb_entry *rbe;
	int rbe_lines;

	if (!scroll_position) {
		print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
		return;
	}
	scroll_position--;
	rbe = ringbuffer_get(bot_win_rb, scroll_position);
	rbe_lines = NUM_LINES(rbe->len);
	wscrl(bot.win, rbe_lines);
	wmove(bot.win, bot.lines - rbe_lines, 0);
	wattron(bot.win, COLOR_PAIR(rbe->color));
	waddstr(bot.win, rbe->msg);
	wrefresh(bot.win);
	print_scroll_msg();
}

static void com_scroll_up(void)
{
	struct rb_entry *rbe = NULL;
	unsigned lines;
	int i, first_rbe, num_scroll;

	/* the entry that is going to vanish */
	rbe = ringbuffer_get(bot_win_rb, scroll_position);
	if (!rbe)
		goto err_out;
	num_scroll = NUM_LINES(rbe->len);
	first_rbe = first_visible_rbe(&lines);
	if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
		goto err_out;
	scroll_position++;
	wscrl(bot.win, -num_scroll);
	i = draw_top_rbe(&lines);
	if (i < 0)
		goto err_out;
	while (i > 0 && lines < num_scroll) {
		int rbe_lines;
		rbe = ringbuffer_get(bot_win_rb, --i);
		if (!rbe)
			break;
		rbe_lines = NUM_LINES(rbe->len);
		lines += rbe_lines;
//		fprintf(stderr, "msg: %s\n", rbe->msg);
		wattron(bot.win, COLOR_PAIR(rbe->color));
		waddstr(bot.win, "\n");
		waddstr(bot.win, rbe->msg);
		if (!i)
			break;
		i--;
	}
	wrefresh(bot.win);
	print_scroll_msg();
	return;
err_out:
	print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
}

static void com_ll_decr(void)
{
	if (loglevel <= LL_DEBUG) {
		print_in_bar(COLOR_ERRMSG,
			"loglevel already at maximal verbosity\n");
		return;
	}
	loglevel--;
	print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
}

static void com_ll_incr(void)
{
	if (loglevel >= LL_EMERG) {
		print_in_bar(COLOR_ERRMSG,
			"loglevel already at minimal verbosity\n");
		return;
	}
	loglevel++;
	print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
}

/*
 * reread configuration, terminate on errors
 */
static void com_reread_conf(void)
{
	char *cf =configfile_exists();
	struct gui_cmdline_parser_params params = {
		.override = 1,
		.initialize = 1,
		.check_required = 0,
		.check_ambiguity = 0
	};

	if (!cf) {
		PARA_WARNING_LOG("there is no configuration to read");
		return;
	}
	PARA_INFO_LOG("rereading command line options and config file");
	gui_cmdline_parser(_argc, _argv, &conf);
	gui_cmdline_parser_config_file(cf, &conf, &params);
	PARA_NOTICE_LOG("config file reloaded");
	if (check_key_map_args() < 0)
		finish(EXIT_FAILURE);
}

static void com_help(void)
{
	int i;

	for (i = 0; i < conf.key_map_given; ++i) {
		char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
		const char *handler_text = "???", *desc = NULL;

		if (!split_key_map(tmp, &handler, &arg)) {
			free(tmp);
			return;
		}
		switch (*handler) {
			case 'i':
				handler_text = "internal";
				desc = command_list[find_cmd_byname(arg)].description;
				break;
			case 'x': handler_text = "external"; break;
			case 'd': handler_text = "display "; break;
			case 'p': handler_text = "para    "; break;
		}
		outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
			strlen(arg) < 8? "\t" : "",
			desc? desc : "");
		free(tmp);
	}
	for (i = 0; command_list[i].handler; i++) {
		struct gui_command gc = command_list[i];

		outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
			strlen(gc.name) < 8? "\t" : "",
			gc.description);
	}
	print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
		"for more info");
}

static void com_shrink_top_win(void)
{
	if (top.lines <= theme.top_lines_min) {
		PARA_WARNING_LOG("can not decrease top window");
		return;
	}
	init_wins(top.lines - 1);
	wclear(top.win);
	print_all_items();
	print_in_bar(COLOR_MSG, "%s", "decreased top window");
}

static void com_enlarge_top_win(void)
{
	if (bot.lines < 3) {
		PARA_WARNING_LOG("can not increase top window");
		return;
	}
	init_wins(top.lines + 1);
	wclear(top.win);
	print_all_items();
	print_in_bar(COLOR_MSG, "increased top window");
}

static void com_version(void)
{
	print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
		CODENAME "\"");
}

__noreturn static void com_quit(void)
{
	finish(0);
}

static void com_refresh(void)
{
	shutdown_curses();
	init_curses();
}

static void change_theme(int next)
{
	if (next)
		next_theme(&theme);
	else
		prev_theme(&theme);
	/* This seems to be needed twice, why? */
	com_refresh();
	com_refresh();
	PARA_NOTICE_LOG("new theme: %s", theme.name);
}

static void com_next_theme(void)
{
	change_theme(1);
}

static void com_prev_theme(void)
{
	change_theme(0);
}


static void handle_command(int c)
{
	int i;

	/* first check user's key bindings */
	for (i = 0; i < conf.key_map_given; ++i) {
		char tmp[MAXLINE], *handler, *arg;

		strcpy(tmp, conf.key_map_arg[i]);
		if (!split_key_map(tmp, &handler, &arg))
			return;
		if (!strcmp(tmp, km_keyname(c))) {
			if (*handler == 'd') {
				display_cmd(arg);
				return;
			}
			if (*handler == 'x') {
				external_cmd(arg);
				return;
			}
			if (*handler == 'p') {
				client_cmd_cmdline(arg);
				return;
			}
			if (*handler == 'i') {
				int num = find_cmd_byname(arg);
				if (num >= 0)
					command_list[num].handler();
				return;
			}
		}
	}
	/* not found, check internal key bindings */
	for (i = 0; command_list[i].handler; i++) {
		if (!strcmp(km_keyname(c), command_list[i].key)) {
			command_list[i].handler();
			return;
		}
	}
	print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
		km_keyname(c));
}

int main(int argc, char *argv[])
{
	int ret;
	char *cf;

	_argc = argc;
	_argv = argv;

	if (gui_cmdline_parser(argc, argv, &conf)) {
		fprintf(stderr, "parse error while reading command line\n");
		exit(EXIT_FAILURE);
	}
	HANDLE_VERSION_FLAG("gui", conf);
	init_theme(0, &theme);
	top.lines = theme.top_lines_default;
	if (check_key_map_args() < 0) {
		fprintf(stderr, "invalid key map\n");
		exit(EXIT_FAILURE);
	}
	cf = configfile_exists();
	if (!cf && conf.config_file_given) {
		fprintf(stderr, "can not read config file %s\n",
			conf.config_file_arg);
		exit(EXIT_FAILURE);
	}
	if (cf) {
		struct gui_cmdline_parser_params params = {
			.override = 0,
			.initialize = 0,
			.check_required = 0,
			.check_ambiguity = 0
		};
		gui_cmdline_parser_config_file(cf, &conf, &params);
	}
	loglevel = get_loglevel_by_name(conf.loglevel_arg);
	if (check_key_map_args() < 0) {
		fprintf(stderr, "invalid key map in config file\n");
		exit(EXIT_FAILURE);
	}
	setup_signal_handling();
	bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
	initscr(); /* needed only once, always successful */
	init_curses();
	print_welcome();
	for (;;) {
		print_status_bar();
		ret = do_select(GETCH_MODE);
		if (!ret)
			continue;
		print_in_bar(COLOR_MSG, " ");
		handle_command(ret);
	}
}