/*
 * Calcurse - text-based organizer
 *
 * Copyright (c) 2004-2012 calcurse Development Team <misc@calcurse.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the
 *        following disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the
 *        following disclaimer in the documentation and/or other
 *        materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Send your feedback or comments to : misc@calcurse.org
 * Calcurse home page : http://calcurse.org
 *
 */

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

#include "calcurse.h"

llist_ts_t alist_p;
static struct apoint bkp_cut_apoint;
static int hilt;

void apoint_free_bkp(void)
{
  if (bkp_cut_apoint.mesg) {
    mem_free(bkp_cut_apoint.mesg);
    bkp_cut_apoint.mesg = 0;
  }
  erase_note(&bkp_cut_apoint.note);
}

static void apoint_free(struct apoint *apt)
{
  mem_free(apt->mesg);
  erase_note(&apt->note);
  mem_free(apt);
}

static void apoint_dup(struct apoint *in, struct apoint *bkp)
{
  EXIT_IF(!in || !bkp, _("null pointer"));

  bkp->start = in->start;
  bkp->dur = in->dur;
  bkp->state = in->state;
  bkp->mesg = mem_strdup(in->mesg);
  if (in->note)
    bkp->note = mem_strdup(in->note);
}

void apoint_llist_init(void)
{
  LLIST_TS_INIT(&alist_p);
}

/*
 * Called before exit to free memory associated with the appointments linked
 * list. No need to be thread safe, as only the main process remains when
 * calling this function.
 */
void apoint_llist_free(void)
{
  LLIST_TS_FREE_INNER(&alist_p, apoint_free);
  LLIST_TS_FREE(&alist_p);
}

/* Sets which appointment is highlighted. */
void apoint_hilt_set(int highlighted)
{
  hilt = highlighted;
}

void apoint_hilt_decrease(int n)
{
  hilt -= n;
}

void apoint_hilt_increase(int n)
{
  hilt += n;
}

/* Return which appointment is highlighted. */
int apoint_hilt(void)
{
  return hilt;
}

static int apoint_cmp_start(struct apoint *a, struct apoint *b)
{
  return a->start < b->start ? -1 : (a->start == b->start ? 0 : 1);
}

struct apoint *apoint_new(char *mesg, char *note, long start, long dur,
                          char state)
{
  struct apoint *apt;

  apt = mem_malloc(sizeof(struct apoint));
  apt->mesg = mem_strdup(mesg);
  apt->note = (note != NULL) ? mem_strdup(note) : NULL;
  apt->state = state;
  apt->start = start;
  apt->dur = dur;

  LLIST_TS_LOCK(&alist_p);
  LLIST_TS_ADD_SORTED(&alist_p, apt, apoint_cmp_start);
  LLIST_TS_UNLOCK(&alist_p);

  return apt;
}

/*
 * Add an item in either the appointment or the event list,
 * depending if the start time is entered or not.
 */
void apoint_add(void)
{
#define LTIME 6
#define LDUR 12
  const char *mesg_1 =
      _("Enter start time ([hh:mm]), leave blank for an all-day event : ");
  const char *mesg_2 =
      _
      ("Enter end time ([hh:mm]) or duration ([+hh:mm], [+xxxdxxhxxm] or [+mm]) : ");
  const char *mesg_3 = _("Enter description :");
  const char *format_message_1 =
      _("You entered an invalid start time, should be [hh:mm]");
  const char *format_message_2 =
      _
      ("Invalid end time/duration, should be [hh:mm], [+hh:mm], [+xxxdxxhxxm] or [+mm]");
  const char *enter_str = _("Press [Enter] to continue");
  int Id = 1;
  char item_time[LDUR] = "";
  char item_mesg[BUFSIZ] = "";
  long apoint_start;
  unsigned heures, minutes;
  unsigned apoint_duration;
  unsigned end_h, end_m;
  int is_appointment = 1;

  /* Get the starting time */
  for (;;) {
    status_mesg(mesg_1, "");
    if (getstring(win[STA].p, item_time, LTIME, 0, 1) != GETSTRING_ESC) {
      if (strlen(item_time) == 0) {
        is_appointment = 0;
        break;
      }

      if (parse_time(item_time, &heures, &minutes) == 1)
        break;
      else {
        status_mesg(format_message_1, enter_str);
        wgetch(win[STA].p);
      }
    } else
      return;
  }

  /*
   * Check if an event or appointment is entered,
   * depending on the starting time, and record the
   * corresponding item.
   */
  if (is_appointment) {         /* Get the appointment duration */
    item_time[0] = '\0';
    for (;;) {
      status_mesg(mesg_2, "");
      if (getstring(win[STA].p, item_time, LDUR, 0, 1) != GETSTRING_ESC) {
        if (*item_time == '+' && parse_duration(item_time + 1,
                                                &apoint_duration) == 1)
          break;
        else if (parse_time(item_time, &end_h, &end_m) == 1) {
          if (end_h < heures || ((end_h == heures) && (end_m < minutes))) {
            apoint_duration = MININSEC - minutes + end_m
                + (24 + end_h - (heures + 1)) * MININSEC;
          } else {
            apoint_duration = MININSEC - minutes
                + end_m + (end_h - (heures + 1)) * MININSEC;
          }
          break;
        } else {
          status_mesg(format_message_2, enter_str);
          wgetch(win[STA].p);
        }
      } else
        return;
    }
  } else                        /* Insert the event Id */
    Id = 1;

  status_mesg(mesg_3, "");
  if (getstring(win[STA].p, item_mesg, BUFSIZ, 0, 1) == GETSTRING_VALID) {
    if (is_appointment) {
      apoint_start = date2sec(*calendar_get_slctd_day(), heures, minutes);
      apoint_new(item_mesg, 0L, apoint_start, min2sec(apoint_duration), 0L);
      if (notify_bar())
        notify_check_added(item_mesg, apoint_start, 0L);
    } else
      event_new(item_mesg, 0L, date2sec(*calendar_get_slctd_day(), 0, 0), Id);

    if (hilt == 0)
      hilt++;
  }
  wins_erase_status_bar();
}

/* Delete an item from the appointment list. */
void apoint_delete(unsigned *nb_events, unsigned *nb_apoints)
{
  const char *del_app_str = _("Do you really want to delete this item ?");
  long date;
  int nb_items = *nb_apoints + *nb_events;
  int to_be_removed = 0;

  date = calendar_get_slctd_day_sec();

  if (nb_items == 0)
    return;

  if (conf.confirm_delete) {
    if (status_ask_bool(del_app_str) != 1) {
      wins_erase_status_bar();
      return;
    }
  }

  if (nb_items != 0) {
    switch (day_erase_item(date, hilt, ERASE_DONT_FORCE)) {
    case EVNT:
    case RECUR_EVNT:
      (*nb_events)--;
      to_be_removed = 1;
      break;
    case APPT:
    case RECUR_APPT:
      (*nb_apoints)--;
      to_be_removed = 3;
      break;
    case 0:
      return;
    default:
      EXIT(_("no such type"));
      /* NOTREACHED */
    }

    if (hilt > 1)
      hilt--;
    if (apad.first_onscreen >= to_be_removed)
      apad.first_onscreen = apad.first_onscreen - to_be_removed;
    if (nb_items == 1)
      hilt = 0;
  }
}

/* Cut an item, so that it can be pasted somewhere else later. */
int apoint_cut(unsigned *nb_events, unsigned *nb_apoints)
{
  const int NBITEMS = *nb_apoints + *nb_events;
  int item_type, to_be_removed;
  long date;

  if (NBITEMS == 0)
    return 0;

  date = calendar_get_slctd_day_sec();
  item_type = day_cut_item(date, hilt);
  if (item_type == EVNT || item_type == RECUR_EVNT) {
    (*nb_events)--;
    to_be_removed = 1;
  } else if (item_type == APPT || item_type == RECUR_APPT) {
    (*nb_apoints)--;
    to_be_removed = 3;
  } else
    EXIT(_("no such type"));
  /* NOTREACHED */

  if (hilt > 1)
    hilt--;
  if (apad.first_onscreen >= to_be_removed)
    apad.first_onscreen = apad.first_onscreen - to_be_removed;
  if (NBITEMS == 1)
    hilt = 0;

  return item_type;
}

/* Paste a previously cut item. */
void apoint_paste(unsigned *nb_events, unsigned *nb_apoints, int cut_item_type)
{
  int item_type;
  long date;

  date = calendar_get_slctd_day_sec();
  item_type = day_paste_item(date, cut_item_type);
  if (item_type == EVNT || item_type == RECUR_EVNT)
    (*nb_events)++;
  else if (item_type == APPT || item_type == RECUR_APPT)
    (*nb_apoints)++;
  else
    return;

  if (hilt == 0)
    hilt++;
}

unsigned apoint_inday(struct apoint *i, long start)
{
  return (i->start <= start + DAYINSEC && i->start + i->dur > start);
}

void apoint_sec2str(struct apoint *o, long day, char *start, char *end)
{
  struct tm lt;
  time_t t;

  if (o->start < day)
    strncpy(start, "..:..", 6);
  else {
    t = o->start;
    localtime_r(&t, &lt);
    snprintf(start, HRMIN_SIZE, "%02u:%02u", lt.tm_hour, lt.tm_min);
  }
  if (o->start + o->dur > day + DAYINSEC)
    strncpy(end, "..:..", 6);
  else {
    t = o->start + o->dur;
    localtime_r(&t, &lt);
    snprintf(end, HRMIN_SIZE, "%02u:%02u", lt.tm_hour, lt.tm_min);
  }
}

void apoint_write(struct apoint *o, FILE * f)
{
  struct tm lt;
  time_t t;

  t = o->start;
  localtime_r(&t, &lt);
  fprintf(f, "%02u/%02u/%04u @ %02u:%02u", lt.tm_mon + 1, lt.tm_mday,
          1900 + lt.tm_year, lt.tm_hour, lt.tm_min);

  t = o->start + o->dur;
  localtime_r(&t, &lt);
  fprintf(f, " -> %02u/%02u/%04u @ %02u:%02u ", lt.tm_mon + 1, lt.tm_mday,
          1900 + lt.tm_year, lt.tm_hour, lt.tm_min);

  if (o->note != NULL)
    fprintf(f, ">%s ", o->note);

  if (o->state & APOINT_NOTIFY)
    fputc('!', f);
  else
    fputc('|', f);

  fprintf(f, "%s\n", o->mesg);
}

struct apoint *apoint_scan(FILE * f, struct tm start, struct tm end, char state,
                           char *note)
{
  char buf[BUFSIZ], *newline;
  time_t tstart, tend;

  /* Read the appointment description */
  if (!fgets(buf, sizeof buf, f))
    return NULL;

  newline = strchr(buf, '\n');
  if (newline)
    *newline = '\0';

  start.tm_sec = end.tm_sec = 0;
  start.tm_isdst = end.tm_isdst = -1;
  start.tm_year -= 1900;
  start.tm_mon--;
  end.tm_year -= 1900;
  end.tm_mon--;

  tstart = mktime(&start);
  tend = mktime(&end);
  EXIT_IF(tstart == -1 || tend == -1 || tstart > tend,
          _("date error in appointment"));
  return apoint_new(buf, note, tstart, tend - tstart, state);
}

/* Retrieve an appointment from the list, given the day and item position. */
struct apoint *apoint_get(long day, int pos)
{
  llist_item_t *i = LLIST_TS_FIND_NTH(&alist_p, pos, day, apoint_inday);

  if (i)
    return LLIST_TS_GET_DATA(i);

  EXIT(_("item not found"));
  /* NOTREACHED */
}

void apoint_delete_bynum(long start, unsigned num, enum eraseflg flag)
{
  llist_item_t *i;
  int need_check_notify = 0;

  LLIST_TS_LOCK(&alist_p);
  i = LLIST_TS_FIND_NTH(&alist_p, num, start, apoint_inday);

  if (!i)
    EXIT(_("no such appointment"));
  struct apoint *apt = LLIST_TS_GET_DATA(i);

  switch (flag) {
  case ERASE_FORCE_ONLY_NOTE:
    erase_note(&apt->note);
    break;
  case ERASE_CUT:
    apoint_free_bkp();
    apoint_dup(apt, &bkp_cut_apoint);
    erase_note(&apt->note);
    /* FALLTHROUGH */
  default:
    if (notify_bar())
      need_check_notify = notify_same_item(apt->start);
    LLIST_TS_REMOVE(&alist_p, i);
    mem_free(apt->mesg);
    mem_free(apt);
    if (need_check_notify)
      notify_check_next_app(0);
    break;
  }

  LLIST_TS_UNLOCK(&alist_p);
}

/*
 * Return the line number of an item (either an appointment or an event) in
 * the appointment panel. This is to help the appointment scroll function
 * to place beggining of the pad correctly.
 */
static int get_item_line(int item_nb, int nb_events_inday)
{
  int separator = 2;
  int line = 0;

  if (item_nb <= nb_events_inday)
    line = item_nb - 1;
  else
    line = nb_events_inday + separator
        + (item_nb - (nb_events_inday + 1)) * 3 - 1;
  return line;
}

/*
 * Update (if necessary) the first displayed pad line to make the
 * appointment panel scroll down next time pnoutrefresh is called.
 */
void apoint_scroll_pad_down(int nb_events_inday, int win_length)
{
  int pad_last_line = 0;
  int item_first_line = 0, item_last_line = 0;
  int borders = 6;
  int awin_length = win_length - borders;

  item_first_line = get_item_line(hilt, nb_events_inday);
  if (hilt < nb_events_inday)
    item_last_line = item_first_line;
  else
    item_last_line = item_first_line + 1;
  pad_last_line = apad.first_onscreen + awin_length;
  if (item_last_line >= pad_last_line)
    apad.first_onscreen = item_last_line - awin_length;
}

/*
 * Update (if necessary) the first displayed pad line to make the
 * appointment panel scroll up next time pnoutrefresh is called.
 */
void apoint_scroll_pad_up(int nb_events_inday)
{
  int item_first_line = 0;

  item_first_line = get_item_line(hilt, nb_events_inday);
  if (item_first_line < apad.first_onscreen)
    apad.first_onscreen = item_first_line;
}

static int apoint_starts_after(struct apoint *apt, long time)
{
  return apt->start > time;
}

/*
 * Look in the appointment list if we have an item which starts before the item
 * stored in the notify_app structure (which is the next item to be notified).
 */
struct notify_app *apoint_check_next(struct notify_app *app, long start)
{
  llist_item_t *i;

  LLIST_TS_LOCK(&alist_p);
  i = LLIST_TS_FIND_FIRST(&alist_p, start, apoint_starts_after);

  if (i) {
    struct apoint *apt = LLIST_TS_GET_DATA(i);

    if (apt->start <= app->time) {
      app->time = apt->start;
      app->txt = mem_strdup(apt->mesg);
      app->state = apt->state;
      app->got_app = 1;
    }
  }

  LLIST_TS_UNLOCK(&alist_p);

  return app;
}

/*
 * Switch notification state.
 */
void apoint_switch_notify(void)
{
  struct day_item *p;
  long date;
  int apoint_nb = 0, need_chk_notify;

  p = day_get_item(hilt);
  if (p->type != APPT && p->type != RECUR_APPT)
    return;

  date = calendar_get_slctd_day_sec();

  if (p->type == RECUR_APPT) {
    recur_apoint_switch_notify(date, p->appt_pos);
    return;
  } else if (p->type == APPT)
    apoint_nb = day_item_nb(date, hilt, APPT);

  need_chk_notify = 0;
  LLIST_TS_LOCK(&alist_p);

  struct apoint *apt = apoint_get(date, apoint_nb);

  apt->state ^= APOINT_NOTIFY;
  if (notify_bar())
    notify_check_added(apt->mesg, apt->start, apt->state);
  if (need_chk_notify)
    notify_check_next_app(0);

  LLIST_TS_UNLOCK(&alist_p);
}

/* Updates the Appointment panel */
void apoint_update_panel(int which_pan)
{
  int title_xpos;
  int bordr = 1;
  int title_lines = 3;
  int app_width = win[APP].w - bordr;
  int app_length = win[APP].h - bordr - title_lines;
  long date;
  struct date slctd_date;

  /* variable inits */
  slctd_date = *calendar_get_slctd_day();
  title_xpos = win[APP].w - (strlen(_(monthnames[slctd_date.mm - 1])) + 16);
  if (slctd_date.dd < 10)
    title_xpos++;
  date = date2sec(slctd_date, 0, 0);
  day_write_pad(date, app_width, app_length, (which_pan == APP) ? hilt : 0);

  /* Print current date in the top right window corner. */
  erase_window_part(win[APP].p, 1, title_lines, win[APP].w - 2, win[APP].h - 2);
  custom_apply_attr(win[APP].p, ATTR_HIGHEST);
  mvwprintw(win[APP].p, title_lines, title_xpos, "%s  %s %d, %d",
            calendar_get_pom(date), _(monthnames[slctd_date.mm - 1]),
            slctd_date.dd, slctd_date.yyyy);
  custom_remove_attr(win[APP].p, ATTR_HIGHEST);

  /* Draw the scrollbar if necessary. */
  if ((apad.length >= app_length) || (apad.first_onscreen > 0)) {
    float ratio = ((float)app_length) / ((float)apad.length);
    int sbar_length = (int)(ratio * app_length);
    int highend = (int)(ratio * apad.first_onscreen);
    unsigned hilt_bar = (which_pan == APP) ? 1 : 0;
    int sbar_top = highend + title_lines + 1;

    if ((sbar_top + sbar_length) > win[APP].h - 1)
      sbar_length = win[APP].h - 1 - sbar_top;
    draw_scrollbar(win[APP].p, sbar_top, win[APP].w - 2, sbar_length,
                   title_lines + 1, win[APP].h - 1, hilt_bar);
  }

  wnoutrefresh(win[APP].p);
  pnoutrefresh(apad.ptrwin, apad.first_onscreen, 0,
               win[APP].y + title_lines + 1, win[APP].x + bordr,
               win[APP].y + win[APP].h - 2 * bordr,
               win[APP].x + win[APP].w - 3 * bordr);
}

void apoint_paste_item(void)
{
  long bkp_time, bkp_start;

  bkp_time = get_item_time(bkp_cut_apoint.start);
  bkp_start = calendar_get_slctd_day_sec() + bkp_time;
  apoint_new(bkp_cut_apoint.mesg, bkp_cut_apoint.note, bkp_start,
             bkp_cut_apoint.dur, bkp_cut_apoint.state);

  if (notify_bar())
    notify_check_added(bkp_cut_apoint.mesg, bkp_start, bkp_cut_apoint.state);

  apoint_free_bkp();
}