/*
 statusbar-items.c : irssi

    Copyright (C) 1999-2001 Timo Sirainen

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

#include "module.h"
#include "signals.h"
#include "settings.h"
#include "servers.h"

#include "themes.h"
#include "statusbar.h"
#include "gui-entry.h"
#include "gui-windows.h"

/* how often to redraw lagging time (seconds) */
#define LAG_REFRESH_TIME 10

static GList *activity_list;
static GSList *more_visible; /* list of MAIN_WINDOW_RECs which have --more-- */
static GHashTable *input_entries;
static int last_lag, last_lag_unknown, lag_timeout_tag;

static void item_window_active(SBAR_ITEM_REC *item, int get_size_only)
{
	WINDOW_REC *window;

        window = active_win;
	if (item->bar->parent_window != NULL)
		window = item->bar->parent_window->active;

	if (window != NULL && window->active != NULL) {
		statusbar_item_default_handler(item, get_size_only,
					       NULL, "", TRUE);
	} else if (get_size_only) {
                item->min_size = item->max_size = 0;
	}
}

static void item_window_empty(SBAR_ITEM_REC *item, int get_size_only)
{
	WINDOW_REC *window;

        window = active_win;
	if (item->bar->parent_window != NULL)
		window = item->bar->parent_window->active;

	if (window != NULL && window->active == NULL) {
		statusbar_item_default_handler(item, get_size_only,
					       NULL, "", TRUE);
	} else if (get_size_only) {
                item->min_size = item->max_size = 0;
	}
}

static char *get_activity_list(MAIN_WINDOW_REC *window, int normal, int hilight)
{
        THEME_REC *theme;
	GString *str;
	GList *tmp;
        char *ret, *name, *format, *value;
        int is_det;

	str = g_string_new(NULL);

	theme = window != NULL && window->active != NULL &&
		window->active->theme != NULL ?
		window->active->theme : current_theme;

	for (tmp = activity_list; tmp != NULL; tmp = tmp->next) {
		WINDOW_REC *window = tmp->data;

		is_det = window->data_level >= DATA_LEVEL_HILIGHT;
		if ((!is_det && !normal) || (is_det && !hilight))
                        continue;

                /* comma separator */
		if (str->len > 0) {
			value = theme_format_expand(theme, "{sb_act_sep ,}");
			g_string_append(str, value);
			g_free(value);
		}

		switch (window->data_level) {
		case DATA_LEVEL_NONE:
		case DATA_LEVEL_TEXT:
			name = "{sb_act_text %d}";
			break;
		case DATA_LEVEL_MSG:
			name = "{sb_act_msg %d}";
			break;
		default:
                        if (window->hilight_color == NULL)
				name = "{sb_act_hilight %d}";
			else
                                name = NULL;
			break;
		}

		if (name != NULL)
			format = g_strdup_printf(name, window->refnum);
		else
			format = g_strdup_printf("{sb_act_hilight_color %s %d}",
						 window->hilight_color,
						 window->refnum);

		value = theme_format_expand(theme, format);
		g_string_append(str, value);
                g_free(value);

		g_free(format);
	}

	ret = str->len == 0 ? NULL : str->str;
        g_string_free(str, ret == NULL);
        return ret;
}

/* redraw activity, FIXME: if we didn't get enough size, this gets buggy.
   At least "Det:" isn't printed properly. also we should rearrange the
   act list so that the highest priority items comes first. */
static void item_act(SBAR_ITEM_REC *item, int get_size_only)
{
	char *actlist;

	actlist = get_activity_list(item->bar->parent_window, TRUE, TRUE);
	if (actlist == NULL) {
		if (get_size_only)
			item->min_size = item->max_size = 0;
		return;
	}

	statusbar_item_default_handler(item, get_size_only,
				       NULL, actlist, FALSE);

	g_free_not_null(actlist);
}

static void sig_statusbar_activity_hilight(WINDOW_REC *window, gpointer oldlevel)
{
	GList *tmp;
	int inspos;

	g_return_if_fail(window != NULL);

	if (settings_get_bool("actlist_moves")) {
		/* Move the window to the first in the activity list */
		if (g_list_find(activity_list, window) != NULL)
			activity_list = g_list_remove(activity_list, window);
		if (window->data_level != 0)
			activity_list = g_list_prepend(activity_list, window);
		statusbar_items_redraw("act");
		return;
	}

	if (g_list_find(activity_list, window) != NULL) {
		/* already in activity list */
		if (window->data_level == 0) {
			/* remove from activity list */
			activity_list = g_list_remove(activity_list, window);
			statusbar_items_redraw("act");
		} else if (window->data_level != GPOINTER_TO_INT(oldlevel) ||
			 window->hilight_color != 0) {
			/* different level as last time (or maybe different
			   hilight color?), just redraw it. */
			statusbar_items_redraw("act");
		}
		return;
	}

	if (window->data_level == 0)
		return;

	/* add window to activity list .. */
	inspos = 0;
	for (tmp = activity_list; tmp != NULL; tmp = tmp->next, inspos++) {
		WINDOW_REC *rec = tmp->data;

		if (window->refnum < rec->refnum) {
			activity_list =
				g_list_insert(activity_list, window, inspos);
			break;
		}
	}
	if (tmp == NULL)
		activity_list = g_list_append(activity_list, window);

	statusbar_items_redraw("act");
}

static void sig_statusbar_activity_window_destroyed(WINDOW_REC *window)
{
	g_return_if_fail(window != NULL);

	if (g_list_find(activity_list, window) != NULL)
		activity_list = g_list_remove(activity_list, window);
	statusbar_items_redraw("act");
}

static void sig_statusbar_activity_updated(void)
{
	statusbar_items_redraw("act");
}

static void item_more(SBAR_ITEM_REC *item, int get_size_only)
{
        MAIN_WINDOW_REC *mainwin;
	int visible;

	if (active_win == NULL) {
                mainwin = NULL;
		visible = FALSE;
	} else {
		mainwin = WINDOW_MAIN(active_win);
		visible = WINDOW_GUI(active_win)->view->more_text;
	}

	if (!visible) {
		if (mainwin != NULL)
			more_visible = g_slist_remove(more_visible, mainwin);
		if (get_size_only)
			item->min_size = item->max_size = 0;
		return;
	}

	more_visible = g_slist_prepend(more_visible, mainwin);
	statusbar_item_default_handler(item, get_size_only, NULL, "", FALSE);
}

static void sig_statusbar_more_updated(void)
{
	int visible;

        visible = g_slist_find(more_visible, WINDOW_MAIN(active_win)) != NULL;
	if (WINDOW_GUI(active_win)->view->more_text != visible)
                statusbar_items_redraw("more");
}

/* Returns the lag in milliseconds. If we haven't been able to ask the lag
   for a while, unknown is set to TRUE. */
static int get_lag(SERVER_REC *server, int *unknown)
{
	long lag;

        *unknown = FALSE;

	if (server == NULL || server->lag_last_check == 0) {
                /* lag has not been asked even once yet */
		return 0;
	}

	if (server->lag_sent.tv_sec == 0) {
		/* no lag queries going on currently */
                return server->lag;
	}

        /* we're not sure about our current lag.. */
	*unknown = TRUE;

        lag = (long) (time(NULL)-server->lag_sent.tv_sec);
	if (server->lag/1000 > lag) {
		/* we've been waiting the lag reply less time than
		   what last known lag was -> use the last known lag */
		return server->lag;
	}

        /* return how long we have been waiting for lag reply */
        return lag*1000;
}

static void item_lag(SBAR_ITEM_REC *item, int get_size_only)
{
	SERVER_REC *server;
        char str[MAX_INT_STRLEN+10];
	int lag, lag_unknown;

	server = active_win == NULL ? NULL : active_win->active_server;
	lag = get_lag(server, &lag_unknown)/10;

	if (lag <= 0 || lag < settings_get_int("lag_min_show")) {
		/* don't print the lag item */
		if (get_size_only)
			item->min_size = item->max_size = 0;
		return;
	}

	last_lag = lag;
	last_lag_unknown = lag_unknown;

	if (lag_unknown) {
		g_snprintf(str, sizeof(str), "%d (?""?)", lag/100);
	} else {
		g_snprintf(str, sizeof(str),
			   lag%100 == 0 ? "%d" : "%d.%02d", lag/100, lag%100);
	}

	statusbar_item_default_handler(item, get_size_only,
				       NULL, str, TRUE);
}

static void lag_check_update(void)
{
	SERVER_REC *server;
	int lag, lag_unknown;

	server = active_win == NULL ? NULL : active_win->active_server;
	lag = get_lag(server, &lag_unknown)/10;

	if (lag < settings_get_int("lag_min_show"))
                lag = 0;

	if (lag != last_lag || (lag > 0 && lag_unknown != last_lag_unknown))
                statusbar_items_redraw("lag");
}

static void sig_server_lag_updated(SERVER_REC *server)
{
	if (active_win != NULL && active_win->active_server == server)
                lag_check_update();
}

static int sig_lag_timeout(void)
{
        lag_check_update();
        return 1;
}

static void item_input(SBAR_ITEM_REC *item, int get_size_only)
{
	GUI_ENTRY_REC *rec;

	rec = g_hash_table_lookup(input_entries, item);
	if (rec == NULL) {
		rec = gui_entry_create(item->xpos, item->bar->real_ypos,
				       item->size);
		gui_entry_set_active(rec);
		g_hash_table_insert(input_entries, item, rec);
	}

	if (get_size_only) {
		item->min_size = 2+term_width/10;
                item->max_size = term_width;
                return;
	}

	gui_entry_move(rec, item->xpos, item->bar->real_ypos,
		       item->size);
	gui_entry_redraw(rec); /* FIXME: this is only necessary with ^L.. */
}

static void sig_statusbar_item_destroyed(SBAR_ITEM_REC *item)
{
	GUI_ENTRY_REC *rec;

	rec = g_hash_table_lookup(input_entries, item);
	if (rec != NULL) {
		gui_entry_destroy(rec);
		g_hash_table_remove(input_entries, item);
	}
}

void statusbar_items_init(void)
{
	settings_add_int("misc", "lag_min_show", 100);
	settings_add_bool("lookandfeel", "actlist_moves", FALSE);

	statusbar_item_register("window", NULL, item_window_active);
	statusbar_item_register("window_empty", NULL, item_window_empty);
	statusbar_item_register("prompt", NULL, item_window_active);
	statusbar_item_register("prompt_empty", NULL, item_window_empty);
	statusbar_item_register("lag", NULL, item_lag);
	statusbar_item_register("act", NULL, item_act);
	statusbar_item_register("more", NULL, item_more);
	statusbar_item_register("input", NULL, item_input);

        /* activity */
	activity_list = NULL;
	signal_add("window activity", (SIGNAL_FUNC) sig_statusbar_activity_hilight);
	signal_add("window destroyed", (SIGNAL_FUNC) sig_statusbar_activity_window_destroyed);
	signal_add("window refnum changed", (SIGNAL_FUNC) sig_statusbar_activity_updated);

        /* more */
        more_visible = NULL;
	signal_add("gui page scrolled", (SIGNAL_FUNC) sig_statusbar_more_updated);
	signal_add("window changed", (SIGNAL_FUNC) sig_statusbar_more_updated);
	signal_add_last("gui print text finished", (SIGNAL_FUNC) sig_statusbar_more_updated);
	signal_add_last("command clear", (SIGNAL_FUNC) sig_statusbar_more_updated);
	signal_add_last("command scrollback", (SIGNAL_FUNC) sig_statusbar_more_updated);

        /* lag */
	last_lag = 0; last_lag_unknown = FALSE;
	signal_add("server lag", (SIGNAL_FUNC) sig_server_lag_updated);
	signal_add("window changed", (SIGNAL_FUNC) lag_check_update);
	signal_add("window server changed", (SIGNAL_FUNC) lag_check_update);
        lag_timeout_tag = g_timeout_add(5000, (GSourceFunc) sig_lag_timeout, NULL);

        /* input */
	input_entries = g_hash_table_new((GHashFunc) g_direct_hash,
					 (GCompareFunc) g_direct_equal);
	signal_add("statusbar item destroyed", (SIGNAL_FUNC) sig_statusbar_item_destroyed);
}

void statusbar_items_deinit(void)
{
        /* activity */
	signal_remove("window activity", (SIGNAL_FUNC) sig_statusbar_activity_hilight);
	signal_remove("window destroyed", (SIGNAL_FUNC) sig_statusbar_activity_window_destroyed);
	signal_remove("window refnum changed", (SIGNAL_FUNC) sig_statusbar_activity_updated);
	g_list_free(activity_list);
        activity_list = NULL;

        /* more */
        g_slist_free(more_visible);
	signal_remove("gui page scrolled", (SIGNAL_FUNC) sig_statusbar_more_updated);
	signal_remove("window changed", (SIGNAL_FUNC) sig_statusbar_more_updated);
	signal_remove("gui print text finished", (SIGNAL_FUNC) sig_statusbar_more_updated);
	signal_remove("command clear", (SIGNAL_FUNC) sig_statusbar_more_updated);
	signal_remove("command scrollback", (SIGNAL_FUNC) sig_statusbar_more_updated);

        /* lag */
	signal_remove("server lag", (SIGNAL_FUNC) sig_server_lag_updated);
	signal_remove("window changed", (SIGNAL_FUNC) lag_check_update);
	signal_remove("window server changed", (SIGNAL_FUNC) lag_check_update);
        g_source_remove(lag_timeout_tag);

        /* input */
	signal_remove("statusbar item destroyed", (SIGNAL_FUNC) sig_statusbar_item_destroyed);
        g_hash_table_destroy(input_entries);
}