import assert from 'assert';
import lodashStable from 'lodash';
import { args, toArgs } from './utils.js';
import pick from '../pick.js';

describe('pick', function() {
  var args = toArgs(['a', 'c']),
      object = { 'a': 1, 'b': 2, 'c': 3, 'd': 4 },
      nested = { 'a': 1, 'b': { 'c': 2, 'd': 3 } };

  it('should flatten `paths`', function() {
    assert.deepStrictEqual(pick(object, 'a', 'c'), { 'a': 1, 'c': 3 });
    assert.deepStrictEqual(pick(object, ['a', 'd'], 'c'), { 'a': 1, 'c': 3, 'd': 4 });
  });

  it('should support deep paths', function() {
    assert.deepStrictEqual(pick(nested, 'b.c'), { 'b': { 'c': 2 } });
  });

  it('should support path arrays', function() {
    var object = { 'a.b': 1, 'a': { 'b': 2 } },
        actual = pick(object, [['a.b']]);

    assert.deepStrictEqual(actual, { 'a.b': 1 });
  });

  it('should pick a key over a path', function() {
    var object = { 'a.b': 1, 'a': { 'b': 2 } };

    lodashStable.each(['a.b', ['a.b']], function(path) {
      assert.deepStrictEqual(pick(object, path), { 'a.b': 1 });
    });
  });

  it('should coerce `paths` to strings', function() {
    assert.deepStrictEqual(pick({ '0': 'a', '1': 'b' }, 0), { '0': 'a' });
  });

  it('should return an empty object when `object` is nullish', function() {
    lodashStable.each([null, undefined], function(value) {
      assert.deepStrictEqual(pick(value, 'valueOf'), {});
    });
  });

  it('should work with a primitive `object`', function() {
    assert.deepStrictEqual(pick('', 'slice'), { 'slice': ''.slice });
  });

  it('should work with `arguments` object `paths`', function() {
    assert.deepStrictEqual(pick(object, args), { 'a': 1, 'c': 3 });
  });
});