/*	$calcurse: event.c,v 1.6 2008/01/20 10:45:38 culot Exp $	*/

/*
 * Calcurse - text-based organizer
 * Copyright (c) 2004-2008 Frederic Culot
 *
 * 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.
 *
 * Send your feedback or comments to : calcurse@culot.org
 * Calcurse home page : http://culot.org/calcurse
 *
 */

#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>

#include "vars.h"
#include "i18n.h"
#include "event.h"

struct event_s *eventlist;

/* Create a new event */
struct event_s *
event_new(char *mesg, char *note, long day, int id)
{
	struct event_s *o, **i;
	o = (struct event_s *) malloc(sizeof(struct event_s));
	o->mesg = (char *) malloc(strlen(mesg) + 1);
	strncpy(o->mesg, mesg, strlen(mesg) + 1);
	o->day = day;
	o->id = id;
	o->note = (note != NULL) ? strdup(note) : NULL;
	i = &eventlist;
	for (;;) {
		if (*i == 0 || (*i)->day > day) {
			o->next = *i;
			*i = o;
			break;
		}
		i = &(*i)->next;
	}
	return o;
}

/* Check if the event belongs to the selected day */
unsigned 
event_inday(struct event_s *i, long start)
{
	if (i->day <= start + DAYINSEC && i->day > start) {
		return 1;
	}
	return 0;
}

/* Write to file the event in user-friendly format */
void 
event_write(struct event_s *o, FILE * f)
{
	struct tm *lt;
	time_t t;

	t = o->day;
	lt = localtime(&t);
	fprintf(f, "%02u/%02u/%04u [%d] ",
	    lt->tm_mon + 1, lt->tm_mday, 1900 + lt->tm_year, o->id);
	if (o->note != NULL)
		fprintf(f, ">%s ", o->note); 
	fprintf(f, "%s\n", o->mesg);
}

/* Load the events from file */
struct event_s *
event_scan(FILE * f, struct tm start, int id, char *note)
{
	struct tm *lt;
	char buf[MESG_MAXSIZE], *nl;
	time_t tstart, t;

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

        /* Read the event description */
	fgets(buf, MESG_MAXSIZE, f);
	nl = strchr(buf, '\n');
	if (nl) {
		*nl = '\0';
	}
        start.tm_hour = 12;
        start.tm_min = 0;
	start.tm_sec =  0;
	start.tm_isdst = -1;
	start.tm_year -= 1900;
	start.tm_mon--;

	tstart = mktime(&start);
	if (tstart == -1) {
		fputs(_("FATAL ERROR in event_scan: date error in the event\n"), stderr);
		exit(EXIT_FAILURE);
	}
	return (event_new(buf, note, tstart, id));
}

/* Retrieve an event from the list, given the day and item position. */
struct event_s *
event_get(long day, int pos)
{
	struct event_s *o;
	int n;

	n = 0;
	for (o = eventlist; o; o = o->next) {
		if (event_inday(o, day)) {
			if (n == pos)
				return o;
			n++;
		}
	}
	/* NOTREACHED */
	fputs(_("FATAL ERROR in event_get: no such item\n"), stderr);
	exit(EXIT_FAILURE);
}

/* Delete an event from the list. */
void 
event_delete_bynum(long start, unsigned num, erase_flag_e flag)
{
	unsigned n;
	struct event_s *i, **iptr;

	n = 0;
	iptr = &eventlist;
	for (i = eventlist; i != 0; i = i->next) {
		if (event_inday(i, start)) {
			if (n == num) {
				if (flag == ERASE_FORCE_ONLY_NOTE)
					erase_note(&i->note, flag);
				else {
					*iptr = i->next;
					free(i->mesg);
					erase_note(&i->note, flag);
					free(i);
				}
				return;
			}
			n++;
		}
		iptr = &i->next;
	}
	/* NOTREACHED */
	fputs(_("FATAL ERROR in event_delete_bynum: no such event\n"), stderr);
	exit(EXIT_FAILURE);
}