/*
 fe-core-commands.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "module.h"
#include "module-formats.h"
#include "signals.h"
#include "commands.h"
#include "levels.h"
#include "misc.h"
#include "line-split.h"
#include "irssi-version.h"

#include "windows.h"

static const char *ret_texts[] = {
        NULL,
	"Not enough parameters given",
	"Not connected to IRC server yet",
	"Not joined to any channels yet",
	"Not joined to such channel",
	"Channel not fully synchronized yet, try again after a while",
	"Doing this is not a good idea. Add -YES if you really mean it",
};

static int commands_compare(COMMAND_REC *rec, COMMAND_REC *rec2)
{
	if (rec->category == NULL && rec2->category != NULL)
		return -1;
	if (rec2->category == NULL && rec->category != NULL)
		return 1;

	return strcmp(rec->cmd, rec2->cmd);
}

static void help_category(GSList *cmdlist, gint items, gint max)
{
    COMMAND_REC *rec, *last;
    GString *str;
    GSList *tmp;
    gint lines, cols, line, col, skip;
    gchar *cmdbuf;

    str = g_string_new(NULL);

    cols = max > 65 ? 1 : (65 / max);
    lines = items <= cols ? 1 : items / cols+1;

    last = NULL; cmdbuf = g_malloc(max+1); cmdbuf[max] = '\0';
    for (line = 0, col = 0, skip = 1, tmp = cmdlist; line < lines; last = rec, tmp = tmp->next)
    {
	rec = tmp->data;

	if (--skip == 0)
	{
	    skip = lines;
	    memset(cmdbuf, ' ', max);
	    memcpy(cmdbuf, rec->cmd, strlen(rec->cmd));
	    g_string_sprintfa(str, "%s ", cmdbuf);
	    cols++;
	}

	if (col == cols || tmp->next == NULL)
	{
	    printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, str->str);
	    g_string_truncate(str, 0);
	    col = 0; line++;
	    tmp = g_slist_nth(cmdlist, line-1); skip = 1;
	}
    }
    if (str->len != 0)
	printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, str->str);
    g_string_free(str, TRUE);
    g_free(cmdbuf);
}

static int show_help(COMMAND_REC *cmd)
{
    char tmpbuf[1024], *str, *path;
    LINEBUF_REC *buffer = NULL;
    int f, ret, recvlen;

    /* helpdir/command or helpdir/category/command */
    if (cmd->category == NULL)
	path = g_strdup_printf("%s/%s", HELPDIR, cmd->cmd);
    else
	path = g_strdup_printf("%s/%s/%s", HELPDIR, cmd->category, cmd->cmd);
    f = open(path, O_RDONLY);
    g_free(path);

    if (f == -1)
	return FALSE;

    /* just print to screen whatever is in the file */
    do
    {
	recvlen = read(f, tmpbuf, sizeof(tmpbuf));

	ret = line_split(tmpbuf, recvlen, &str, &buffer);
        if (ret > 0) printtext(NULL, NULL, MSGLEVEL_NEVER, str);
    }
    while (ret > 0);
    line_split_free(buffer);

    close(f);
    return TRUE;
}

static void cmd_help(gchar *data)
{
    COMMAND_REC *rec, *last, *helpitem;
    GSList *tmp, *cmdlist;
    gint len, max, items, findlen;
    gboolean header;

    g_return_if_fail(data != NULL);

    /* sort the commands list */
    commands = g_slist_sort(commands, (GCompareFunc) commands_compare);

    /* print command, sort by category */
    cmdlist = NULL; last = NULL; header = FALSE; helpitem = NULL;
    max = items = 0; findlen = strlen(data);
    for (tmp = commands; tmp != NULL; last = rec, tmp = tmp->next)
    {
	rec = tmp->data;

	if (last != NULL && rec->category != NULL &&
	    (last->category == NULL || strcmp(rec->category, last->category) != 0))
	{
	    /* category changed */
	    if (items > 0)
	    {
		if (!header)
		{
		    printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, "Irssi commands:");
		    header = TRUE;
		}
		if (last->category != NULL)
		{
		    printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, "");
		    printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, "%s:", last->category);
		}
		help_category(cmdlist, items, max);
	    }

	    g_slist_free(cmdlist); cmdlist = NULL;
	    items = 0; max = 0;
	}

	if (last != NULL && g_strcasecmp(rec->cmd, last->cmd) == 0)
	    continue; /* don't display same command twice */

	if (strlen(rec->cmd) >= findlen && g_strncasecmp(rec->cmd, data, findlen) == 0)
	{
	    if (rec->cmd[findlen] == '\0')
	    {
		helpitem = rec;
		break;
	    }
	    else if (strchr(rec->cmd+findlen+1, ' ') == NULL)
	    {
		/* not a subcommand (and matches the query) */
		len = strlen(rec->cmd);
		if (max < len) max = len;
		items++;
		cmdlist = g_slist_append(cmdlist, rec);
	    }
	}
    }

    if ((helpitem == NULL && items == 0) || (helpitem != NULL && !show_help(helpitem)))
	printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, "No help for %s", data);

    if (items != 0)
    {
	/* display the last category */
	if (!header)
	{
	    printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, "Irssi commands:");
	    header = TRUE;
	}

	if (last->category != NULL)
	{
	    printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, "");
	    printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, "%s:", last->category);
	}
	help_category(cmdlist, items, max);
	g_slist_free(cmdlist);
    }
}

static void cmd_echo(const char *data, void *server, WI_ITEM_REC *item)
{
	g_return_if_fail(data != NULL);

	printtext(server, item == NULL ? NULL : item->name, MSGLEVEL_CRAP, "%s", data);
}

static void cmd_version(char *data)
{
	g_return_if_fail(data != NULL);

	if (*data == '\0')
		printtext(NULL, NULL, MSGLEVEL_CLIENTNOTICE, "Client: "PACKAGE" " IRSSI_VERSION);
}

static void cmd_cat(const char *data)
{
	char tmpbuf[1024], *str, *fname;
	LINEBUF_REC *buffer = NULL;
	int f, ret, recvlen;

	fname = convert_home(data);
	f = open(fname, O_RDONLY);
	g_free(fname);
	if (f == -1) {
		/* file not found */
                printtext(NULL, NULL, MSGLEVEL_CLIENTERROR, "%s", g_strerror(errno));
		return;
	}

	do {
		recvlen = read(f, tmpbuf, sizeof(tmpbuf));

		ret = line_split(tmpbuf, recvlen, &str, &buffer);
		if (ret > 0) printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP, "%s", str);
	} while (ret > 0);
	line_split_free(buffer);

	close(f);
}

static void cmd_beep(void)
{
	printbeep();
}

static void cmd_unknown(const char *data, void *server, WI_ITEM_REC *item)
{
	char *cmd;

	cmd = g_strdup(data); g_strup(cmd);
	printtext(server, item == NULL ? NULL : item->name, MSGLEVEL_CRAP, "Unknown command: %s", cmd);
	g_free(cmd);

	signal_stop();
}

static void event_cmderror(gpointer errorp)
{
	int error;

	error = GPOINTER_TO_INT(errorp);
        if (error == CMDERR_ERRNO)
		printtext(NULL, NULL, MSGLEVEL_CLIENTERROR, g_strerror(errno));
	else
		printtext(NULL, NULL, MSGLEVEL_CLIENTERROR, ret_texts[error]);
}

void fe_core_commands_init(void)
{
	command_bind("help", NULL, (SIGNAL_FUNC) cmd_help);
	command_bind("echo", NULL, (SIGNAL_FUNC) cmd_echo);
	command_bind("version", NULL, (SIGNAL_FUNC) cmd_version);
	command_bind("cat", NULL, (SIGNAL_FUNC) cmd_cat);
	command_bind("beep", NULL, (SIGNAL_FUNC) cmd_beep);

	signal_add("unknown command", (SIGNAL_FUNC) cmd_unknown);
	signal_add("default command", (SIGNAL_FUNC) cmd_unknown);
	signal_add("error command", (SIGNAL_FUNC) event_cmderror);
}

void fe_core_commands_deinit(void)
{
	command_unbind("help", (SIGNAL_FUNC) cmd_help);
	command_unbind("echo", (SIGNAL_FUNC) cmd_echo);
	command_unbind("version", (SIGNAL_FUNC) cmd_version);
	command_unbind("cat", (SIGNAL_FUNC) cmd_cat);
	command_unbind("beep", (SIGNAL_FUNC) cmd_beep);

	signal_remove("unknown command", (SIGNAL_FUNC) cmd_unknown);
	signal_remove("default command", (SIGNAL_FUNC) cmd_unknown);
	signal_remove("error command", (SIGNAL_FUNC) event_cmderror);
}