let { DefaultButton, addDays, getDateRangeArray, Calendar, DayOfWeek, DateRangeType, Fabric } = window.Fabric;

const DayPickerStrings = {
  months: [
    'January',
    'February',
    'March',
    'April',
    'May',
    'June',
    'July',
    'August',
    'September',
    'October',
    'November',
    'December'
  ],

  shortMonths: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],

  days: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],

  shortDays: ['S', 'M', 'T', 'W', 'T', 'F', 'S'],

  goToToday: 'Go to today',
  weekNumberFormatString: 'Week number {0}'
};

interface ICalendarInlineExampleState {
  selectedDate?: Date | null;
  selectedDateRange?: Date[] | null;
}

interface ICalendarInlineExampleProps {
  isMonthPickerVisible?: boolean;
  dateRangeType: DateRangeType;
  autoNavigateOnSelection: boolean;
  showGoToToday: boolean;
  showNavigateButtons?: boolean;
  highlightCurrentMonth?: boolean;
  highlightSelectedMonth?: boolean;
  isDayPickerVisible?: boolean;
  showMonthPickerAsOverlay?: boolean;
  showWeekNumbers?: boolean;
  minDate?: Date;
  maxDate?: Date;
  showSixWeeksByDefault?: boolean;
  workWeekDays?: DayOfWeek[];
  firstDayOfWeek?: DayOfWeek;
}

class CalendarInlineExample extends React.Component<ICalendarInlineExampleProps, ICalendarInlineExampleState> {
  public constructor(props: ICalendarInlineExampleProps) {
    super(props);

    this.state = {
      selectedDate: null,
      selectedDateRange: null
    };

    this._onDismiss = this._onDismiss.bind(this);
    this._onSelectDate = this._onSelectDate.bind(this);
    this._goNext = this._goNext.bind(this);
    this._goPrevious = this._goPrevious.bind(this);
  }

  public render(): JSX.Element {
    const divStyle: React.CSSProperties = {
      height: '340px'
    };

    const buttonStyle: React.CSSProperties = {
      margin: '17px 10px 0 0'
    };

    let dateRangeString: string | null = null;
    if (this.state.selectedDateRange) {
      const rangeStart = this.state.selectedDateRange[0];
      const rangeEnd = this.state.selectedDateRange[this.state.selectedDateRange.length - 1];
      dateRangeString = rangeStart.toLocaleDateString() + '-' + rangeEnd.toLocaleDateString();
    }

    return (
      <div style={divStyle}>
        {
          <div>
            Selected date(s):{' '}
            <span>{!this.state.selectedDate ? 'Not set' : this.state.selectedDate.toLocaleString()}</span>
          </div>
        }
        <div>
          Selected dates:
          <span> {!dateRangeString ? 'Not set' : dateRangeString}</span>
        </div>
        {(this.props.minDate || this.props.maxDate) && (
          <div>
            Date boundary:
            <span>
              {' '}
              {this.props.minDate ? this.props.minDate.toLocaleDateString() : 'Not set'}-
              {this.props.maxDate ? this.props.maxDate.toLocaleDateString() : 'Not set'}
            </span>
          </div>
        )}
        <Calendar
          onSelectDate={this._onSelectDate}
          onDismiss={this._onDismiss}
          isMonthPickerVisible={this.props.isMonthPickerVisible}
          dateRangeType={this.props.dateRangeType}
          autoNavigateOnSelection={this.props.autoNavigateOnSelection}
          showGoToToday={this.props.showGoToToday}
          value={this.state.selectedDate!}
          firstDayOfWeek={this.props.firstDayOfWeek ? this.props.firstDayOfWeek : DayOfWeek.Sunday}
          strings={DayPickerStrings}
          highlightCurrentMonth={this.props.highlightCurrentMonth}
          highlightSelectedMonth={this.props.highlightSelectedMonth}
          isDayPickerVisible={this.props.isDayPickerVisible}
          showMonthPickerAsOverlay={this.props.showMonthPickerAsOverlay}
          showWeekNumbers={this.props.showWeekNumbers}
          minDate={this.props.minDate}
          maxDate={this.props.maxDate}
          showSixWeeksByDefault={this.props.showSixWeeksByDefault}
          workWeekDays={this.props.workWeekDays}
        />
        {this.props.showNavigateButtons && (
          <div>
            <DefaultButton style={buttonStyle} onClick={this._goPrevious} text="Previous" />
            <DefaultButton style={buttonStyle} onClick={this._goNext} text="Next" />
          </div>
        )}
      </div>
    );
  }

  private _onDismiss(): void {
    this.setState((prevState: ICalendarInlineExampleState) => {
      return prevState;
    });
  }

  private _goPrevious(): void {
    this.setState((prevState: ICalendarInlineExampleState) => {
      const selectedDate = prevState.selectedDate || new Date();
      const dateRangeArray = getDateRangeArray(selectedDate, this.props.dateRangeType, DayOfWeek.Sunday);

      let subtractFrom = dateRangeArray[0];
      let daysToSubtract = dateRangeArray.length;

      if (this.props.dateRangeType === DateRangeType.Month) {
        subtractFrom = new Date(subtractFrom.getFullYear(), subtractFrom.getMonth(), 1);
        daysToSubtract = 1;
      }

      const newSelectedDate = addDays(subtractFrom, -daysToSubtract);

      return {
        selectedDate: newSelectedDate
      };
    });
  }

  private _goNext(): void {
    this.setState((prevState: ICalendarInlineExampleState) => {
      const selectedDate = prevState.selectedDate || new Date();
      const dateRangeArray = getDateRangeArray(selectedDate, this.props.dateRangeType, DayOfWeek.Sunday);
      const newSelectedDate = addDays(dateRangeArray.pop()!, 1);

      return {
        selectedDate: newSelectedDate
      };
    });
  }

  private _onSelectDate(date: Date, dateRangeArray: Date[]): void {
    this.setState((prevState: ICalendarInlineExampleState) => {
      return {
        selectedDate: date,
        selectedDateRange: dateRangeArray
      };
    });
  }
}

ReactDOM.render(<CalendarInlineExample />, document.getElementById('content'));