/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* global MozElements, MozXULElement */

"use strict";

//                           The calendar view class hierarchy.
//
//                                 CalendarFilteredViewMixin
//                                             |
//                                     CalendarBaseView
//                                     /               \
//             CalendarMultidayBaseView                CalendarMonthBaseView
//                 /           \                           /               \
//     CalendarDayView     CalendarWeekView    CalendarMultiweekView    CalendarMonthView

// Wrap in a block to prevent leaking to window scope.
{
  var { cal } = ChromeUtils.import("resource:///modules/calendar/calUtils.jsm");

  /**
   * The calendar view for viewing a single day.
   *
   * @augments {MozElements.CalendarMultidayBaseView}
   * @implements {calICalendarView}
   */
  class CalendarDayView extends MozElements.CalendarMultidayBaseView {
    get observerID() {
      return "day-view-observer";
    }

    get supportsWorkdaysOnly() {
      return false;
    }

    goToDay(date) {
      if (!date) {
        this.relayout();
        return;
      }
      const timezoneDate = date.getInTimezone(this.timezone);
      this.setDateRange(timezoneDate, timezoneDate);
      this.selectedDay = timezoneDate;
    }

    moveView(number) {
      if (number) {
        const currentDay = this.startDay.clone();
        currentDay.day += number;
        this.goToDay(currentDay);
      } else {
        this.goToDay(cal.dtz.now());
      }
    }
  }

  MozXULElement.implementCustomInterface(CalendarDayView, [Ci.calICalendarView]);

  customElements.define("calendar-day-view", CalendarDayView);

  /**
   * The calendar view for viewing a single week.
   *
   * @augments {MozElements.CalendarMultidayBaseView}
   * @implements {calICalendarView}
   */
  class CalendarWeekView extends MozElements.CalendarMultidayBaseView {
    get observerID() {
      return "week-view-observer";
    }

    goToDay(date) {
      this.displayDaysOff = !this.mWorkdaysOnly;

      if (!date) {
        this.relayout();
        return;
      }
      date = date.getInTimezone(this.timezone);
      const weekStart = cal.weekInfoService.getStartOfWeek(date);
      const weekEnd = weekStart.clone();
      weekEnd.day += 6;
      this.setDateRange(weekStart, weekEnd);
      this.selectedDay = date;
    }

    moveView(number) {
      if (number) {
        const date = this.selectedDay.clone();
        date.day += 7 * number;
        this.goToDay(date);
      } else {
        this.goToDay(cal.dtz.now());
      }
    }
  }

  MozXULElement.implementCustomInterface(CalendarWeekView, [Ci.calICalendarView]);

  customElements.define("calendar-week-view", CalendarWeekView);

  /**
   * The calendar view for viewing multiple weeks.
   *
   * @augments {MozElements.CalendarMonthBaseView}
   * @implements {calICalendarView}
   */
  class CalendarMultiweekView extends MozElements.CalendarMonthBaseView {
    connectedCallback() {
      if (this.delayConnectedCallback() || this.hasConnected) {
        return;
      }
      // this.hasConnected is set to true via super.connectedCallback.
      super.connectedCallback();

      this.mWeeksInView = Services.prefs.getIntPref("calendar.weeks.inview", 4);
    }

    set weeksInView(weeks) {
      this.mWeeksInView = weeks;
      Services.prefs.setIntPref("calendar.weeks.inview", Number(weeks));
      this.refreshView();
    }

    get weeksInView() {
      return this.mWeeksInView;
    }

    get supportsZoom() {
      return true;
    }

    get observerID() {
      return "multiweek-view-observer";
    }

    zoomIn(level = 1) {
      const visibleWeeks = level + Services.prefs.getIntPref("calendar.weeks.inview", 4);

      Services.prefs.setIntPref("calendar.weeks.inview", Math.min(visibleWeeks, 6));
    }

    zoomOut(level = 1) {
      const visibleWeeks = level + Services.prefs.getIntPref("calendar.weeks.inview", 4);

      Services.prefs.setIntPref("calendar.weeks.inview", Math.max(visibleWeeks, 2));
    }

    zoomReset() {
      Services.prefs.setIntPref("calendar.view.visiblehours", 4);
    }

    goToDay(date) {
      this.showFullMonth = false;
      this.displayDaysOff = !this.mWorkdaysOnly;

      // If date is null it means that only a refresh is needed
      // without changing the start and end of the view.
      if (date) {
        date = date.getInTimezone(this.timezone);

        // Get the first date that should be shown. This is the
        // start of the week of the day that we're centering around
        // adjusted for the day the week starts on and the number
        // of previous weeks we're supposed to display.
        const dayStart = cal.weekInfoService.getStartOfWeek(date);
        dayStart.day -= 7 * Services.prefs.getIntPref("calendar.previousweeks.inview", 0);

        // The last day we're supposed to show.
        const dayEnd = dayStart.clone();
        dayEnd.day += 7 * this.mWeeksInView - 1;
        this.setDateRange(dayStart, dayEnd);
        this.selectedDay = date;
      } else {
        this.relayout();
      }
    }

    moveView(weeksToMove) {
      if (weeksToMove) {
        const date = this.startDay.clone();
        const savedSelectedDay = this.selectedDay.clone();
        // weeksToMove only corresponds to the number of weeks to move
        // make sure to compensate for previous weeks in view too.
        const prevWeeks = Services.prefs.getIntPref("calendar.previousweeks.inview", 4);
        date.day += 7 * (weeksToMove + prevWeeks);
        this.goToDay(date);
        savedSelectedDay.day += 7 * weeksToMove;
        this.selectedDay = savedSelectedDay;
      } else {
        const date = cal.dtz.now();
        this.goToDay(date);
        this.selectedDay = date;
      }
    }
  }

  MozXULElement.implementCustomInterface(CalendarMultiweekView, [Ci.calICalendarView]);

  customElements.define("calendar-multiweek-view", CalendarMultiweekView);

  /**
   * The calendar view for viewing a single month.
   *
   * @augments {MozElements.CalendarMonthBaseView}
   * @implements {calICalendarView}
   */
  class CalendarMonthView extends MozElements.CalendarMonthBaseView {
    connectedCallback() {
      if (this.delayConnectedCallback() || this.hasConnected) {
        return;
      }
      // this.hasConnected is set to true via super.connectedCallback.
      super.connectedCallback();
    }

    // calICalendarView Methods and Properties.

    get observerID() {
      return "month-view-observer";
    }

    goToDay(date) {
      this.displayDaysOff = !this.mWorkdaysOnly;

      this.showDate(date ? date.getInTimezone(this.timezone) : null);
      if (!date) {
        this.setDateBoxRelations();
      }
    }

    getRangeDescription() {
      const monthName = cal.l10n.formatMonth(
        this.rangeStartDate.month + 1,
        "calendar",
        "monthInYear"
      );

      return cal.l10n.getCalString("monthInYear", [monthName, this.rangeStartDate.year]);
    }

    moveView(number) {
      const dates = this.getDateList();
      this.displayDaysOff = !this.mWorkdaysOnly;

      if (number) {
        // The first few dates in this list are likely in the month
        // prior to the one actually being shown (since the month
        // probably doesn't start on a Sunday).  The 7th item must
        // be in correct month though.
        const date = dates[6].clone();

        date.month += number;
        // Store selected day before we move.
        const oldSelectedDay = this.selectedDay;

        this.goToDay(date);

        // Most of the time we want to select the date with the
        // same day number in the next month.
        const newSelectedDay = oldSelectedDay.clone();
        newSelectedDay.month += number;

        // Correct for accidental rollover into the next month.
        if ((newSelectedDay.month - number + 12) % 12 != oldSelectedDay.month) {
          newSelectedDay.month -= 1;
          newSelectedDay.day = newSelectedDay.endOfMonth.day;
        }

        this.selectedDay = newSelectedDay;
      } else {
        const date = cal.dtz.now();
        this.goToDay(date);
        this.selectedDay = date;
      }
    }

    // End calICalendarView Methods and Properties.
  }

  MozXULElement.implementCustomInterface(CalendarMonthView, [Ci.calICalendarView]);

  customElements.define("calendar-month-view", CalendarMonthView);
}