import {Ng2vDateISOParserFormatter} from './ng2v-date-parser-formatter';

describe('ng2v-date parsing and formatting', () => {
  let pf: Ng2vDateISOParserFormatter;

  beforeEach(() => { pf = new Ng2vDateISOParserFormatter(); });

  describe('parsing', () => {

    it('should parse null undefined and empty string as null', () => {
      expect(pf.parse(null)).toBeNull();
      expect(pf.parse(undefined)).toBeNull();
      expect(pf.parse('')).toBeNull();
      expect(pf.parse('   ')).toBeNull();
    });

    it('should parse valid date', () => { expect(pf.parse('2016-05-12')).toEqual({year: 2016, month: 5, day: 12}); });

    it('should parse non-date as null', () => {
      expect(pf.parse('foo-bar-baz')).toBeNull();
      expect(pf.parse('2014-bar')).toBeNull();
      expect(pf.parse('2014-11-12-15')).toBeNull();
    });

    it('should do its best parsing incomplete dates',
       () => { expect(pf.parse('2011-5')).toEqual({year: 2011, month: 5, day: null}); });
  });

  describe('formatting', () => {

    it('should format null and undefined as an empty string', () => {
      expect(pf.format(null, null)).toBe('');
      expect(pf.format(undefined, undefined)).toBe('');
    });

    it('should format a valid date', () => { expect(pf.format({year: 2016, month: 10, day: 15}, "DD-MMM-YYYY")).toBe('15-Oct-2016'); });

    it('should format a valid date with padding',
       () => { expect(pf.format({year: 2016, month: 10, day: 5}, "")).toBe('2016-10-05'); });

    it('should try its best with invalid dates', () => {
      expect(pf.format({year: 2016, month: NaN, day: undefined}, "")).toBe('2016--');
      expect(pf.format({year: 2016, month: null, day: 0}, "")).toBe('2016--00');
    });
  });

});