/* eslint-env jest */
import getTabIndex from '../../../src/util/getTabIndex';
import IdentifierMock from '../../../__mocks__/IdentifierMock';
import JSXAttributeMock from '../../../__mocks__/JSXAttributeMock';

describe('getTabIndex', () => {
  describe('tabIndex is defined', () => {
    describe('as a number ', () => {
      describe('zero', () => {
        it('should return zero', () => {
          expect(
            getTabIndex(
              JSXAttributeMock('tabIndex', 0),
            ),
          ).toBe(0);
        });
      });
      describe('positive integer', () => {
        it('should return the integer', () => {
          expect(
            getTabIndex(
              JSXAttributeMock('tabIndex', 1),
            ),
          ).toBe(1);
        });
      });
      describe('negative integer', () => {
        it('should return the integer', () => {
          expect(
            getTabIndex(
              JSXAttributeMock('tabIndex', -1),
            ),
          ).toBe(-1);
        });
      });
      describe('float', () => {
        it('should return undefined', () => {
          expect(
            getTabIndex(
              JSXAttributeMock('tabIndex', 9.1),
            ),
          ).toBeUndefined();
        });
      });
    });
    describe('as a string', () => {
      describe('empty', () => {
        it('should return undefined', () => {
          expect(
            getTabIndex(
              JSXAttributeMock('tabIndex', ''),
            ),
          ).toBeUndefined();
        });
      });
      describe('which converts to a number', () => {
        it('should return an integer', () => {
          expect(
            getTabIndex(
              JSXAttributeMock('tabIndex', '0'),
            ),
          ).toBe(0);
        });
      });
      describe('which is NaN', () => {
        it('should return undefined', () => {
          expect(
            getTabIndex(
              JSXAttributeMock('tabIndex', '0a'),
            ),
          ).toBeUndefined();
        });
      });
    });
    describe('as a boolean', () => {
      describe('true', () => {
        it('should return undefined', () => {
          expect(
            getTabIndex(
              JSXAttributeMock('tabIndex', true),
            ),
          ).toBeUndefined();
        });
      });
      describe('false', () => {
        it('should return undefined', () => {
          expect(
            getTabIndex(
              JSXAttributeMock('tabIndex', false),
            ),
          ).toBeUndefined();
        });
      });
    });
    describe('as an expression', () => {
      describe('function expression', () => {
        it('should return the correct type', () => {
          const attr = function mockFn() { return 0; };
          expect(
            typeof getTabIndex(
              JSXAttributeMock('tabIndex', attr),
            ),
          ).toEqual('function');
        });
      });
      describe('variable expression', () => {
        it('should return the Identifier name', () => {
          const name = 'identName';
          expect(
            getTabIndex(
              JSXAttributeMock(
                'tabIndex',
                IdentifierMock(name),
                true,
              ),
            ),
          ).toEqual(name);
        });
      });
    });
  });
  describe('tabIndex is not defined', () => {
    it('should return undefined', () => {
      expect(
        getTabIndex(
          JSXAttributeMock('tabIndex', undefined),
        ),
      ).toBeUndefined();
    });
  });
});