import assert from 'assert';
import lodashStable from 'lodash';
import { falsey } from './utils.js';
import orderBy from '../orderBy.js';

describe('orderBy', function() {
  var objects = [
    { 'a': 'x', 'b': 3 },
    { 'a': 'y', 'b': 4 },
    { 'a': 'x', 'b': 1 },
    { 'a': 'y', 'b': 2 }
  ];

  it('should sort by a single property by a specified order', function() {
    var actual = orderBy(objects, 'a', 'desc');
    assert.deepStrictEqual(actual, [objects[1], objects[3], objects[0], objects[2]]);
  });

  it('should sort by multiple properties by specified orders', function() {
    var actual = orderBy(objects, ['a', 'b'], ['desc', 'asc']);
    assert.deepStrictEqual(actual, [objects[3], objects[1], objects[2], objects[0]]);
  });

  it('should sort by a property in ascending order when its order is not specified', function() {
    var expected = [objects[2], objects[0], objects[3], objects[1]],
        actual = orderBy(objects, ['a', 'b']);

    assert.deepStrictEqual(actual, expected);

    expected = lodashStable.map(falsey, lodashStable.constant([objects[3], objects[1], objects[2], objects[0]]));

    actual = lodashStable.map(falsey, function(order, index) {
      return orderBy(objects, ['a', 'b'], index ? ['desc', order] : ['desc']);
    });

    assert.deepStrictEqual(actual, expected);
  });

  it('should work with `orders` specified as string objects', function() {
    var actual = orderBy(objects, ['a'], [Object('desc')]);
    assert.deepStrictEqual(actual, [objects[1], objects[3], objects[0], objects[2]]);
  });
});