import { NbNativeDateService, NbCalendarYearModelService } from '@nebular/theme';

describe('NbCalendarYearModelService', () => {
  let yearModelService: NbCalendarYearModelService<Date>;
  let yearsInView: number;
  let yearsInRow: number;

  beforeEach(() => {
    yearModelService = new NbCalendarYearModelService(new NbNativeDateService('en-US'));
    yearsInView = yearModelService.getYearsInView();
    yearsInRow = yearModelService.getYearsInRow();
  });

  it('should return correct years range', () => {
    const date = new Date(2017, 0, 1);
    const viewYears: Date[][] = yearModelService.getViewYears(date);

    const firstYear = viewYears[0][0];
    const lastRow = viewYears[viewYears.length - 1];
    const lastYear = lastRow[lastRow.length - 1];

    expect(firstYear.getFullYear()).toBe(2016);
    expect(lastYear.getFullYear()).toBe(2027);
  });

  it('should return correct year range for 0 year', () => {
    const date = new Date();
    date.setFullYear(0);
    const viewYears: Date[][] = yearModelService.getViewYears(date);

    const firstYear = viewYears[0][0];
    const lastRow = viewYears[viewYears.length - 1];
    const lastYear = lastRow[lastRow.length - 1];

    expect(firstYear.getFullYear()).toBe(0);
    expect(lastYear.getFullYear()).toBe(11);
  });

  it('should return correct year range for negative year', () => {
    const date = new Date();
    date.setFullYear(-1);
    const viewYears: Date[][] = yearModelService.getViewYears(date);

    const firstYear = viewYears[0][0];
    const lastRow = viewYears[viewYears.length - 1];
    const lastYear = lastRow[lastRow.length - 1];

    expect(firstYear.getFullYear()).toBe(-12);
    expect(lastYear.getFullYear()).toBe(-1);
  });
});