/*
 command-history.c : irssi

    Copyright (C) 1999 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 "misc.h"
#include "special-vars.h"
#include "settings.h"

#include "windows.h"
#include "window-items.h"

/* command history */
static GList *cmdhist, *histpos;
static int histlines;
static int window_history;

void command_history_add(WINDOW_REC *window, const char *text, int prepend)
{
	GList **pcmdhist, *link;
	int *phistlines;

	g_return_if_fail(text != NULL);

	if (window_history) {
		/* window specific command history */
		pcmdhist = &window->cmdhist;
		phistlines = &window->histlines;
	} else {
		/* global command history */
		pcmdhist = &cmdhist;
		phistlines = &histlines;
	}

	if (settings_get_int("max_command_history") < 1 || *phistlines < settings_get_int("max_command_history"))
		(*phistlines)++;
	else {
		link = *pcmdhist;
		g_free(link->data);
		*pcmdhist = g_list_remove_link(*pcmdhist, link);
		g_list_free_1(link);
	}

	if (prepend)
		*pcmdhist = g_list_prepend(*pcmdhist, g_strdup(text));
	else
		*pcmdhist = g_list_append(*pcmdhist, g_strdup(text));
}

const char *command_history_prev(WINDOW_REC *window, const char *text)
{
	GList *pos, **phistpos;

	phistpos = window_history ? &window->histpos : &histpos;

	pos = *phistpos;
	if (*phistpos == NULL)
		*phistpos = g_list_last(window_history ? window->cmdhist : cmdhist);
	else
		*phistpos = (*phistpos)->prev;

	if (*text != '\0' &&
	    (pos == NULL || strcmp(pos->data, text) != 0)) {
		/* save the old entry to history */
		command_history_add(window, text, FALSE);
	}

	return *phistpos == NULL ? "" : (*phistpos)->data;
}

const char *command_history_next(WINDOW_REC *window, const char *text)
{
	GList *pos, **phistpos;

	phistpos = window_history ? &window->histpos : &histpos;

	pos = *phistpos;
	if (*phistpos == NULL)
		*phistpos = window_history ? window->cmdhist : cmdhist;
	else
		*phistpos = (*phistpos)->next;

	if (*text != '\0' &&
	    (pos == NULL || strcmp(pos->data, text) != 0)) {
		/* save the old entry to history */
		command_history_add(window, text, TRUE);
	}
	return *phistpos == NULL ? "" : (*phistpos)->data;
}

void command_history_clear_pos(WINDOW_REC *window)
{
	window->histpos = NULL;
	histpos = NULL;
}

static void sig_window_created(WINDOW_REC *window)
{
	window->histlines = 0;
	window->cmdhist = NULL;
	window->histpos = NULL;
}

static void sig_window_destroyed(WINDOW_REC *window)
{
	g_list_foreach(window->cmdhist, (GFunc) g_free, NULL);
	g_list_free(window->cmdhist);
}

static char *special_history_func(const char *text, void *item, int *free_ret)
{
	WINDOW_REC *window;
	GList *tmp;
        char *findtext, *ret;

	window = item == NULL ? active_win : window_item_window(item);

	findtext = g_strdup_printf("*%s*", text);
	ret = NULL;

	tmp = window_history ? window->cmdhist : cmdhist;
	for (; tmp != NULL; tmp = tmp->next) {
		const char *line = tmp->data;

		if (match_wildcards(findtext, line)) {
			*free_ret = TRUE;
                        ret = g_strdup(line);
		}
	}
	g_free(findtext);

	return ret;
}

static void read_settings(void)
{
	window_history = settings_get_bool("window_history");
}

void command_history_init(void)
{
	settings_add_int("history", "max_command_history", 100);
	settings_add_bool("history", "window_history", FALSE);

	special_history_func_set(special_history_func);

	histlines = 0;
	cmdhist = NULL; histpos = NULL;
	read_settings();
	signal_add("window created", (SIGNAL_FUNC) sig_window_created);
	signal_add("window destroyed", (SIGNAL_FUNC) sig_window_destroyed);
	signal_add("setup changed", (SIGNAL_FUNC) read_settings);
}

void command_history_deinit(void)
{
	signal_remove("window created", (SIGNAL_FUNC) sig_window_created);
	signal_remove("window destroyed", (SIGNAL_FUNC) sig_window_destroyed);
	signal_remove("setup changed", (SIGNAL_FUNC) read_settings);

	g_list_foreach(cmdhist, (GFunc) g_free, NULL);
	g_list_free(cmdhist);
}