/*
 windows.c : irssi

    Copyright (C) 1999-2000 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.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "module.h"
#include <irssi/src/fe-common/core/module-formats.h>
#include <irssi/src/core/modules.h>
#include <irssi/src/core/signals.h>
#include <irssi/src/core/commands.h>
#include <irssi/src/core/servers.h>
#include <irssi/src/core/misc.h>
#include <irssi/src/core/settings.h>

#include <irssi/src/core/levels.h>

#include <irssi/src/fe-common/core/printtext.h>
#include <irssi/src/fe-common/core/fe-windows.h>
#include <irssi/src/fe-common/core/window-items.h>

GSList *windows; /* first in the list is the active window,
                    next is the last active, etc. */
GSequence *windows_seq;
WINDOW_REC *active_win;

static int daytag;
static int daycheck; /* 0 = don't check, 1 = time is 00:00, check,
                        2 = time is 00:00, already checked */

static int window_refnum_lookup(WINDOW_REC *window, void *refnum_p)
{
	int refnum = GPOINTER_TO_INT(refnum_p);
	return window->refnum == refnum ? 0 : window->refnum < refnum ? -1 : 1;
}

static GSequenceIter *windows_seq_begin(void)
{
	return g_sequence_get_begin_iter(windows_seq);
}

static GSequenceIter *windows_seq_end(void)
{
	return g_sequence_get_end_iter(windows_seq);
}

static GSequenceIter *windows_seq_insert(WINDOW_REC *rec)
{
	return g_sequence_insert_sorted(windows_seq, rec, (GCompareDataFunc)window_refnum_cmp, NULL);
}

static GSequenceIter *windows_seq_refnum_lookup(int refnum)
{
	return g_sequence_lookup(windows_seq, GINT_TO_POINTER(refnum), (GCompareDataFunc)window_refnum_lookup, NULL);
}

static void windows_seq_changed(GSequenceIter *iter)
{
	g_sequence_sort_changed(iter, (GCompareDataFunc)window_refnum_cmp, NULL);
}

static GSequenceIter *windows_seq_window_lookup(WINDOW_REC *rec)
{
	return g_sequence_lookup(windows_seq, rec, (GCompareDataFunc)window_refnum_cmp, NULL);
}

/* search to the numerically right iterator of refnum */
static GSequenceIter *windows_seq_refnum_search_right(int refnum)
{
	return g_sequence_search(windows_seq, GINT_TO_POINTER(refnum), (GCompareDataFunc)window_refnum_lookup, NULL);
}

/* we want to find the numerically left iterator of refnum, so we
   search the right of the previous refnum. but we need to figure out
   the case where the iterator is already at the beginning, i.e
   iter->refnum >= refnum */
static GSequenceIter *windows_seq_refnum_search_left(int refnum)
{
	GSequenceIter *iter = windows_seq_refnum_search_right(refnum - 1);
	return iter == windows_seq_begin() ? NULL : g_sequence_iter_prev(iter);
}

static int window_get_new_refnum(void)
{
	WINDOW_REC *win;
	GSequenceIter *iter, *end;
	int refnum;

	refnum = 1;
	iter = windows_seq_begin();
	end = windows_seq_end();

	while (iter != end) {
		win = g_sequence_get(iter);

		if (refnum != win->refnum)
			return refnum;

		refnum++;
		iter = g_sequence_iter_next(iter);
	}

	return refnum;
}

WINDOW_REC *window_create(WI_ITEM_REC *item, int automatic)
{
	WINDOW_REC *rec;

	rec = g_new0(WINDOW_REC, 1);
	rec->refnum = window_get_new_refnum();
	rec->level = settings_get_level("window_default_level");

	windows = g_slist_prepend(windows, rec);
	windows_seq_insert(rec);
	signal_emit("window created", 2, rec, GINT_TO_POINTER(automatic));

	if (item != NULL) window_item_add(rec, item, automatic);
	if (windows->next == NULL || !automatic || settings_get_bool("window_auto_change")) {
		if (automatic && windows->next != NULL)
			signal_emit("window changed automatic", 1, rec);
		window_set_active(rec);
	}
	return rec;
}

static void window_set_refnum0(WINDOW_REC *window, int refnum)
{
	int old_refnum;

	g_return_if_fail(window != NULL);
	g_return_if_fail(refnum >= 1);
	if (window->refnum == refnum) return;

	old_refnum = window->refnum;
	window->refnum = refnum;
	signal_emit("window refnum changed", 2, window, GINT_TO_POINTER(old_refnum));
}

/* removed_refnum was removed from the windows list, pack the windows so
   there won't be any holes. If there is any holes after removed_refnum,
   leave the windows behind it alone. */
static void windows_pack(int removed_refnum)
{
	WINDOW_REC *window;
	int refnum;
	GSequenceIter *iter, *end;

	refnum = removed_refnum + 1;
	end = windows_seq_end();
	iter = windows_seq_refnum_lookup(refnum);
	if (iter == NULL) return;

	while (iter != end) {
		window = g_sequence_get(iter);

		if (window == NULL || window->sticky_refnum || window->refnum != refnum)
			break;

		window_set_refnum0(window, refnum - 1);
		windows_seq_changed(iter);

		refnum++;
		iter = g_sequence_iter_next(iter);
	}
}

void window_destroy(WINDOW_REC *window)
{
	GSequenceIter *iter;
	g_return_if_fail(window != NULL);

	if (window->destroying) return;
	window->destroying = TRUE;
	windows = g_slist_remove(windows, window);
	iter = windows_seq_window_lookup(window);
	if (iter != NULL) g_sequence_remove(iter);

	if (active_win == window) {
		active_win = NULL; /* it's corrupted */
		if (windows != NULL)
			window_set_active(windows->data);
	}

	while (window->items != NULL)
		window_item_destroy(window->items->data);

        if (settings_get_bool("windows_auto_renumber"))
		windows_pack(window->refnum);

	signal_emit("window destroyed", 1, window);

	while (window->bound_items != NULL)
                window_bind_destroy(window, window->bound_items->data);

	g_free_not_null(window->hilight_color);
	g_free_not_null(window->servertag);
	g_free_not_null(window->theme_name);
	g_free_not_null(window->name);
	g_free(window);
}

void window_auto_destroy(WINDOW_REC *window)
{
	if (settings_get_bool("autoclose_windows") && windows->next != NULL &&
	    window->items == NULL && window->bound_items == NULL &&
	    window->level == 0 && !window->immortal)
                window_destroy(window);
}

void window_set_active(WINDOW_REC *window)
{
	WINDOW_REC *old_window;

	if (window == active_win)
		return;

	old_window = active_win;
	active_win = window;
	if (active_win != NULL) {
		windows = g_slist_remove(windows, active_win);
		windows = g_slist_prepend(windows, active_win);
	}

        if (active_win != NULL)
		signal_emit("window changed", 2, active_win, old_window);
}

void window_change_server(WINDOW_REC *window, void *server)
{
	SERVER_REC *active, *connect;

	if (server != NULL && SERVER(server)->disconnected)
		return;

	if (server == NULL) {
		active = connect = NULL;
	} else if (g_slist_find(servers, server) != NULL) {
		active = server;
		connect = NULL;
	} else {
		active = NULL;
		connect = server;
	}

	if (window->connect_server != connect) {
		window->connect_server = connect;
		signal_emit("window connect changed", 2, window, connect);
	}

	if (window->active_server != active) {
		window->active_server = active;
		signal_emit("window server changed", 2, window, active);
	}
}

void window_set_refnum(WINDOW_REC *window, int refnum)
{
	GSequenceIter *other_iter, *window_iter;
	int old_refnum;

	g_return_if_fail(window != NULL);
	g_return_if_fail(refnum >= 1);
	if (window->refnum == refnum) return;

	other_iter = windows_seq_refnum_lookup(refnum);
	window_iter = windows_seq_refnum_lookup(window->refnum);

	if (other_iter != NULL) {
		WINDOW_REC *rec = g_sequence_get(other_iter);

		rec->refnum = window->refnum;
		signal_emit("window refnum changed", 2, rec, GINT_TO_POINTER(refnum));
	}

	old_refnum = window->refnum;
	window->refnum = refnum;
	signal_emit("window refnum changed", 2, window, GINT_TO_POINTER(old_refnum));

	if (window_iter != NULL && other_iter != NULL) {
		g_sequence_swap(other_iter, window_iter);
	} else {
		windows_seq_changed(window_iter);
	}
}

void window_set_name(WINDOW_REC *window, const char *name)
{
	g_free_not_null(window->name);
	window->name = name == NULL || *name == '\0' ? NULL : g_strdup(name);

	signal_emit("window name changed", 1, window);
}

void window_set_history(WINDOW_REC *window, const char *name)
{
	char *oldname;
	oldname = window->history_name;

	if (name == NULL || *name == '\0')
		window->history_name = NULL;
	else
		window->history_name = g_strdup(name);

	signal_emit("window history changed", 2, window, oldname);

	g_free_not_null(oldname);
}

void window_clear_history(WINDOW_REC *window, const char *name)
{
	signal_emit("window history cleared", 2, window, name);
}

void window_set_level(WINDOW_REC *window, int level)
{
	g_return_if_fail(window != NULL);

	window->level = level;
        signal_emit("window level changed", 1, window);
}

void window_set_immortal(WINDOW_REC *window, int immortal)
{
	g_return_if_fail(window != NULL);

	window->immortal = immortal;
        signal_emit("window immortal changed", 1, window);
}

/* return active item's name, or if none is active, window's name */
const char *window_get_active_name(WINDOW_REC *window)
{
	g_return_val_if_fail(window != NULL, NULL);

	if (window->active != NULL)
		return window->active->visible_name;

	return window->name;
}

#define WINDOW_LEVEL_MATCH(window, server, level) \
	(((window)->level & level) && \
	 (server == NULL || (window)->active_server == server))

WINDOW_REC *window_find_level(void *server, int level)
{
	GSList *tmp;
	WINDOW_REC *match;

	match = NULL;
	for (tmp = windows; tmp != NULL; tmp = tmp->next) {
		WINDOW_REC *rec = tmp->data;

		if (WINDOW_LEVEL_MATCH(rec, server, level)) {
			/* prefer windows without any items */
			if (rec->items == NULL)
				return rec;

			if (match == NULL)
				match = rec;
			else if (active_win == rec) {
				/* prefer active window over others */
				match = rec;
			}
		}
	}

	return match;
}

WINDOW_REC *window_find_closest(void *server, const char *name, int level)
{
	WINDOW_REC *window,*namewindow=NULL;
	WI_ITEM_REC *item;
	int i;

	/* match by name */
	item = name == NULL ? NULL :
		window_item_find(server, name);
	if (item != NULL) {
		namewindow = window_item_window(item);
		if (namewindow != NULL &&
		    ((namewindow->level & level) != 0 ||
		     !settings_get_bool("window_check_level_first"))) {
			/* match, but if multiple windows have the same level
			   we could be choosing a bad one here, eg.
			   name=nick1 would get nick2's query instead of
			   generic msgs window.

	                   And check for prefixed !channel name --Borys  */
			if (g_ascii_strcasecmp(name, item->visible_name) == 0 ||
			    g_ascii_strcasecmp(name, (char *) window_item_get_target((WI_ITEM_REC *) item)) == 0)
				return namewindow;
		}
	}

	/* prefer windows without items */
	for (i = 0; i < 2; i++) {
		/* match by level */
		if (level != MSGLEVEL_HILIGHT)
			level &= ~(MSGLEVEL_HILIGHT | MSGLEVEL_NOHILIGHT);
		window = window_find_level(server, level);
		if (window != NULL && (i == 1 || window->items == NULL))
			return window;

		/* match by level - ignore server */
		window = window_find_level(NULL, level);
		if (window != NULL && (i == 1 || window->items == NULL))
			return window;
	}

	/* still return item's window if we didnt find anything */
	if (namewindow != NULL) return namewindow;

	/* fallback to active */
	return active_win;
}

WINDOW_REC *window_find_refnum(int refnum)
{
	GSequenceIter *iter;

	iter = windows_seq_refnum_lookup(refnum);
	if (iter != NULL) {
		WINDOW_REC *rec = g_sequence_get(iter);

		return rec;
	}

	return NULL;
}

WINDOW_REC *window_find_name(const char *name)
{
	GSList *tmp;

	g_return_val_if_fail(name != NULL, NULL);

	for (tmp = windows; tmp != NULL; tmp = tmp->next) {
		WINDOW_REC *rec = tmp->data;

		if (rec->name != NULL &&
		    g_ascii_strcasecmp(rec->name, name) == 0)
			return rec;
	}

	return NULL;
}

WINDOW_REC *window_find_item(SERVER_REC *server, const char *name)
{
	WINDOW_REC *rec;
	WI_ITEM_REC *item;

	g_return_val_if_fail(name != NULL, NULL);

	rec = window_find_name(name);
	if (rec != NULL) return rec;

	item = server == NULL ? NULL :
		window_item_find(server, name);
	if (item == NULL) {
		/* not found from the active server - any server? */
		item = window_item_find(NULL, name);
	}

	if (item == NULL)
		return NULL;

	return window_item_window(item);
}

int window_refnum_prev(int refnum, int wrap)
{
	WINDOW_REC *rec;
	GSequenceIter *iter, *end;

	iter = windows_seq_refnum_search_left(refnum);
	end = windows_seq_end();

	if (iter != NULL) {
		rec = g_sequence_get(iter);
		return rec->refnum;
	}

	if (wrap) {
		iter = g_sequence_iter_prev(end);
		if (iter != end) {
			rec = g_sequence_get(iter);
			return rec->refnum;
		}
	}

	return -1;
}

int window_refnum_next(int refnum, int wrap)
{
	WINDOW_REC *rec;
	GSequenceIter *iter, *end;

	iter = windows_seq_refnum_search_right(refnum);
	end = windows_seq_end();

	if (iter != end) {
		rec = g_sequence_get(iter);
		return rec->refnum;
	}

	if (wrap) {
		iter = windows_seq_begin();
		if (iter != end) {
			rec = g_sequence_get(iter);
			return rec->refnum;
		}
	}

	return -1;
}

int windows_refnum_last(void)
{
	WINDOW_REC *rec;
	GSequenceIter *end, *iter;

	end = windows_seq_end();
	iter = g_sequence_iter_prev(end);
	if (iter != end) {
		rec = g_sequence_get(iter);
		return rec->refnum;
	}

	return -1;
}

int window_refnum_cmp(WINDOW_REC *w1, WINDOW_REC *w2)
{
	return w1 == w2 ? 0 : w1->refnum < w2->refnum ? -1 : 1;
}

GSList *windows_get_sorted(void)
{
	GSequenceIter *iter, *begin;
	GSList *sorted;

        sorted = NULL;
	iter = windows_seq_end();
	begin = windows_seq_begin();

	while (iter != begin) {
		WINDOW_REC *rec;

		iter = g_sequence_iter_prev(iter);
		rec = g_sequence_get(iter);

		sorted = g_slist_prepend(sorted, rec);
	}

        return sorted;
}

/* Add a new bind to window - if duplicate is found it's returned */
WINDOW_BIND_REC *window_bind_add(WINDOW_REC *window, const char *servertag,
				 const char *name)
{
	WINDOW_BIND_REC *rec;

        g_return_val_if_fail(window != NULL, NULL);
        g_return_val_if_fail(servertag != NULL, NULL);
	g_return_val_if_fail(name != NULL, NULL);

	rec = window_bind_find(window, servertag, name);
	if (rec != NULL)
		return rec;

	rec = g_new0(WINDOW_BIND_REC, 1);
        rec->name = g_strdup(name);
        rec->servertag = g_strdup(servertag);

	window->bound_items = g_slist_append(window->bound_items, rec);
        return rec;
}

void window_bind_destroy(WINDOW_REC *window, WINDOW_BIND_REC *rec)
{
	g_return_if_fail(window != NULL);
        g_return_if_fail(rec != NULL);

	window->bound_items = g_slist_remove(window->bound_items, rec);

        g_free(rec->servertag);
        g_free(rec->name);
        g_free(rec);
}

WINDOW_BIND_REC *window_bind_find(WINDOW_REC *window, const char *servertag,
				  const char *name)
{
	GSList *tmp;

        g_return_val_if_fail(window != NULL, NULL);
        g_return_val_if_fail(servertag != NULL, NULL);
        g_return_val_if_fail(name != NULL, NULL);

	for (tmp = window->bound_items; tmp != NULL; tmp = tmp->next) {
		WINDOW_BIND_REC *rec = tmp->data;

		if (g_ascii_strcasecmp(rec->name, name) == 0 &&
		    g_ascii_strcasecmp(rec->servertag, servertag) == 0)
                        return rec;
	}

        return NULL;
}

void window_bind_remove_unsticky(WINDOW_REC *window)
{
	GSList *tmp, *next;

	for (tmp = window->bound_items; tmp != NULL; tmp = next) {
		WINDOW_BIND_REC *rec = tmp->data;

		next = tmp->next;
		if (!rec->sticky)
                        window_bind_destroy(window, rec);
	}
}

static void sig_server_connected(SERVER_REC *server)
{
	GSList *tmp;

	g_return_if_fail(server != NULL);

	/* Try to keep some server assigned to windows..
	   Also change active window's server if the window is empty */
	for (tmp = windows; tmp != NULL; tmp = tmp->next) {
		WINDOW_REC *rec = tmp->data;

		if ((rec->servertag == NULL ||
		     g_ascii_strcasecmp(rec->servertag, server->tag) == 0) &&
		    (rec->active_server == NULL ||
		     (rec == active_win && rec->items == NULL)))
			window_change_server(rec, server);
	}
}

static void sig_server_disconnected(SERVER_REC *server)
{
	GSList *tmp;
        SERVER_REC *new_server;

	g_return_if_fail(server != NULL);

	new_server = servers == NULL ? NULL : servers->data;
	for (tmp = windows; tmp != NULL; tmp = tmp->next) {
		WINDOW_REC *rec = tmp->data;

		if (rec->active_server == server ||
		    rec->connect_server == server) {
			window_change_server(rec, rec->servertag != NULL ?
					     NULL : new_server);
		}
	}
}

static void window_print_daychange(WINDOW_REC *window, time_t t)
{
        THEME_REC *theme;
        TEXT_DEST_REC dest;
	struct tm *tm;
	char *format, str[256];
	int ret;

	theme = active_win->theme != NULL ? active_win->theme : current_theme;
	format_create_dest(&dest, NULL, NULL, MSGLEVEL_NEVER, window);
	format = format_get_text_theme(theme, MODULE_NAME, &dest,
				       TXT_DAYCHANGE);
	tm = localtime(&t);
	ret = strftime(str, sizeof(str), format, tm);
	g_free(format);
	if (ret <= 0) return;

	printtext_string_window(window, MSGLEVEL_NEVER, str);
}

short color_24bit_256 (const unsigned char rgb[])
{
	static const int cstep_size = 40;
	static const int cstep_start = 0x5f;

	static const int gstep_size = 10;
	static const int gstep_start = 0x08;

	int dist[3] = {0};
	int r[3], gr[3];

	size_t i;

	for (i = 0; i < 3; ++i) {
		const int n = rgb[i];
		gr[i] = -1;
		if (n < cstep_start /2) {
			r[i] = 0;
			dist[i] = -cstep_size/2;
		}
		else {
			r[i] = 1+((n-cstep_start + cstep_size /2)/cstep_size);
			dist[i] = ((n-cstep_start + cstep_size /2)%cstep_size - cstep_size/2);
		}
		if (n < gstep_start /2) {
			gr[i] = -1;
		}
		else {
			gr[i] = ((n-gstep_start + gstep_size /2)/gstep_size);
		}
	}
	if (r[0] == r[1] && r[1] == r[2] &&
	    4*abs(dist[0]) < gstep_size && 4*abs(dist[1]) < gstep_size && 4*abs(dist[2]) < gstep_size) {
		/* skip gray detection */
	}
	else {
		const int j = r[1] == r[2] ? 0 : 1;
		if ((r[0] == r[1] || r[j] == r[2]) && abs(r[j]-r[(j+1)%3]) <= 1) {
			const int k = gr[1] == gr[2] ? 0 : 1;
			if ((gr[0] == gr[1] || gr[k] == gr[2]) && abs(gr[k]-gr[(k+1)%3]) <= 2) {
				if (gr[k] < 0) {
					r[0] = r[1] = r[2] = 0;
				}
				else if (gr[k] > 23) {
					r[0] = r[1] = r[2] = 5;
				}
				else {
					r[0] = 6;
					r[1] = (gr[k] / 6);
					r[2] = gr[k]%6;
				}
			}
		}
	}
	return 16 + r[0]*36 + r[1] * 6 + r[2];
}

static void sig_print_text(void)
{
	GSList *tmp;
	time_t t;
	struct tm *tm;

	t = time(NULL);
	tm = localtime(&t);
	if (tm->tm_hour != 0 || tm->tm_min != 0)
		return;

	daycheck = 2;
	signal_remove("print text", (SIGNAL_FUNC) sig_print_text);

	/* day changed, print notice about it to every window */
	for (tmp = windows; tmp != NULL; tmp = tmp->next)
		window_print_daychange(tmp->data, t);
}

static int sig_check_daychange(void)
{
	time_t t;
	struct tm *tm;

	t = time(NULL);
	tm = localtime(&t);

	if (daycheck == 1 && tm->tm_hour == 0 && tm->tm_min == 0) {
		sig_print_text();
		return TRUE;
	}

	if (tm->tm_hour != 23 || tm->tm_min != 59) {
		daycheck = 0;
		return TRUE;
	}

	/* time is 23:59 */
	if (daycheck == 0) {
		daycheck = 1;
		signal_add("print text", (SIGNAL_FUNC) sig_print_text);
	}
	return TRUE;
}

static void read_settings(void)
{
	if (daytag != -1) {
		g_source_remove(daytag);
		daytag = -1;
	}

	if (settings_get_bool("timestamps"))
		daytag = g_timeout_add(30000, (GSourceFunc) sig_check_daychange, NULL);
}

void windows_init(void)
{
	active_win = NULL;
	windows_seq = g_sequence_new(NULL);
	daycheck = 0; daytag = -1;
	settings_add_bool("lookandfeel", "window_auto_change", FALSE);
	settings_add_bool("lookandfeel", "windows_auto_renumber", TRUE);
	settings_add_bool("lookandfeel", "window_check_level_first", FALSE);
	settings_add_level("lookandfeel", "window_default_level", "NONE");

	read_settings();
	signal_add("server looking", (SIGNAL_FUNC) sig_server_connected);
	signal_add("server connected", (SIGNAL_FUNC) sig_server_connected);
	signal_add("server disconnected", (SIGNAL_FUNC) sig_server_disconnected);
	signal_add("server connect failed", (SIGNAL_FUNC) sig_server_disconnected);
	signal_add("setup changed", (SIGNAL_FUNC) read_settings);
}

void windows_deinit(void)
{
	if (daytag != -1) g_source_remove(daytag);
	if (daycheck == 1) signal_remove("print text", (SIGNAL_FUNC) sig_print_text);

	signal_remove("server looking", (SIGNAL_FUNC) sig_server_connected);
	signal_remove("server connected", (SIGNAL_FUNC) sig_server_connected);
	signal_remove("server disconnected", (SIGNAL_FUNC) sig_server_disconnected);
	signal_remove("server connect failed", (SIGNAL_FUNC) sig_server_disconnected);
	signal_remove("setup changed", (SIGNAL_FUNC) read_settings);
	g_sequence_free(windows_seq);
	windows_seq = NULL;
}