import assert from 'assert';
import lodashStable from 'lodash';
import { _, args, LARGE_ARRAY_SIZE } from './utils.js';

describe('xor methods', function() {
  lodashStable.each(['xor', 'xorBy', 'xorWith'], function(methodName) {
    var func = _[methodName];

    it('`_.' + methodName + '` should return the symmetric difference of two arrays', function() {
      var actual = func([2, 1], [2, 3]);
      assert.deepStrictEqual(actual, [1, 3]);
    });

    it('`_.' + methodName + '` should return the symmetric difference of multiple arrays', function() {
      var actual = func([2, 1], [2, 3], [3, 4]);
      assert.deepStrictEqual(actual, [1, 4]);

      actual = func([1, 2], [2, 1], [1, 2]);
      assert.deepStrictEqual(actual, []);
    });

    it('`_.' + methodName + '` should return an empty array when comparing the same array', function() {
      var array = [1],
          actual = func(array, array, array);

      assert.deepStrictEqual(actual, []);
    });

    it('`_.' + methodName + '` should return an array of unique values', function() {
      var actual = func([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]);
      assert.deepStrictEqual(actual, [1, 4]);

      actual = func([1, 1]);
      assert.deepStrictEqual(actual, [1]);
    });

    it('`_.' + methodName + '` should return a new array when a single array is given', function() {
      var array = [1];
      assert.notStrictEqual(func(array), array);
    });

    it('`_.' + methodName + '` should ignore individual secondary arguments', function() {
      var array = [0];
      assert.deepStrictEqual(func(array, 3, null, { '0': 1 }), array);
    });

    it('`_.' + methodName + '` should ignore values that are not arrays or `arguments` objects', function() {
      var array = [1, 2];
      assert.deepStrictEqual(func(array, 3, { '0': 1 }, null), array);
      assert.deepStrictEqual(func(null, array, null, [2, 3]), [1, 3]);
      assert.deepStrictEqual(func(array, null, args, null), [3]);
    });

    it('`_.' + methodName + '` should return a wrapped value when chaining', function() {
      var wrapped = _([1, 2, 3])[methodName]([5, 2, 1, 4]);
      assert.ok(wrapped instanceof _);
    });

    it('`_.' + methodName + '` should work when in a lazy sequence before `head` or `last`', function() {
      var array = lodashStable.range(LARGE_ARRAY_SIZE + 1),
          wrapped = _(array).slice(1)[methodName]([LARGE_ARRAY_SIZE, LARGE_ARRAY_SIZE + 1]);

      var actual = lodashStable.map(['head', 'last'], function(methodName) {
        return wrapped[methodName]();
      });

      assert.deepEqual(actual, [1, LARGE_ARRAY_SIZE + 1]);
    });
  });
});