import {JsonTransformerUtil} from './json-transformer.util';

describe('dateTransformer', () => {
  it('leaves numbers alone', () => {
    const someNumber = 42;
    expect(JsonTransformerUtil.transformDates(someNumber)).toBe(42);
  });

  it('leaves booleans alone', () => {
    const theTruth = true;
    expect(JsonTransformerUtil.transformDates(theTruth)).toBeTrue();
  });

  it('handles null and undefined', () => {
    const totallyUndefined = undefined;
    const nullValue = null;

    expect(JsonTransformerUtil.transformDates(totallyUndefined)).toBeUndefined();
    expect(JsonTransformerUtil.transformDates(nullValue)).toBeNull();
    expect(JsonTransformerUtil.transformDates(nullValue)).toBeNull();
  });

  it('leaves non-date string alone', () => {
    const myString = 'I\'m a beautiful string with åll the speciæl charactørs!';
    expect(JsonTransformerUtil.transformDates(myString)).toEqual('I\'m a beautiful string with åll the speciæl charactørs!');
  });

  it('transform a date string', () => {
    const myString = '2020-11-08T11:06:15.31';

    const transformedValue = JsonTransformerUtil.transformDates(myString);

    expect(transformedValue.getTime).toBeDefined();
    expect(transformedValue.toDateString()).toEqual('Sun Nov 08 2020');
  });

  it('transforms all entries in array', () => {
    const list = [{a: '2020-11-08T11:06:15.31'}, {q: '2020-11-08T11:06:15.31', a: 'some string that should not be touched'}];
    const transformedValue = JsonTransformerUtil.transformDates(list);

    expect(transformedValue[0].a.toDateString()).toEqual('Sun Nov 08 2020');
    expect(transformedValue[1].a).toEqual('some string that should not be touched');
    expect(transformedValue[1].q.toDateString()).toEqual('Sun Nov 08 2020');
  });

  it('transforms all properties in object', () => {
    const obj = {
      a: {
        a: {
          nestedDate: '2020-11-08T11:06:15.31'
        },
        b: 'should not be changed'
      },
      b: 'should not change',
      date: '2020-11-08T11:06:15.31'
    };
    const transformedValue = JsonTransformerUtil.transformDates(obj);

    expect(transformedValue.date.toDateString()).toEqual('Sun Nov 08 2020');
    expect(transformedValue.b).toEqual('should not change');
    expect(transformedValue.a.a.nestedDate.toDateString()).toEqual('Sun Nov 08 2020');
    expect(transformedValue.a.b).toEqual('should not be changed');

  });
});