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

describe('trim methods', function() {
  lodashStable.each(['trim', 'trimStart', 'trimEnd'], function(methodName, index) {
    var func = _[methodName],
        parts = [];

    if (index != 2) {
      parts.push('leading');
    }
    if (index != 1) {
      parts.push('trailing');
    }
    parts = parts.join(' and ');

    it('`_.' + methodName + '` should remove ' + parts + ' whitespace', function() {
      var string = whitespace + 'a b c' + whitespace,
          expected = (index == 2 ? whitespace : '') + 'a b c' + (index == 1 ? whitespace : '');

      assert.strictEqual(func(string), expected);
    });

    it('`_.' + methodName + '` should coerce `string` to a string', function() {
      var object = { 'toString': lodashStable.constant(whitespace + 'a b c' + whitespace) },
          expected = (index == 2 ? whitespace : '') + 'a b c' + (index == 1 ? whitespace : '');

      assert.strictEqual(func(object), expected);
    });

    it('`_.' + methodName + '` should remove ' + parts + ' `chars`', function() {
      var string = '-_-a-b-c-_-',
          expected = (index == 2 ? '-_-' : '') + 'a-b-c' + (index == 1 ? '-_-' : '');

      assert.strictEqual(func(string, '_-'), expected);
    });

    it('`_.' + methodName + '` should coerce `chars` to a string', function() {
      var object = { 'toString': lodashStable.constant('_-') },
          string = '-_-a-b-c-_-',
          expected = (index == 2 ? '-_-' : '') + 'a-b-c' + (index == 1 ? '-_-' : '');

      assert.strictEqual(func(string, object), expected);
    });

    it('`_.' + methodName + '` should return an empty string for empty values and `chars`', function() {
      lodashStable.each([null, '_-'], function(chars) {
        assert.strictEqual(func(null, chars), '');
        assert.strictEqual(func(undefined, chars), '');
        assert.strictEqual(func('', chars), '');
      });
    });

    it('`_.' + methodName + '` should work with `undefined` or empty string values for `chars`', function() {
      var string = whitespace + 'a b c' + whitespace,
          expected = (index == 2 ? whitespace : '') + 'a b c' + (index == 1 ? whitespace : '');

      assert.strictEqual(func(string, undefined), expected);
      assert.strictEqual(func(string, ''), string);
    });

    it('`_.' + methodName + '` should work as an iteratee for methods like `_.map`', function() {
      var string = Object(whitespace + 'a b c' + whitespace),
          trimmed = (index == 2 ? whitespace : '') + 'a b c' + (index == 1 ? whitespace : ''),
          actual = lodashStable.map([string, string, string], func);

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

    it('`_.' + methodName + '` should return an unwrapped value when implicitly chaining', function() {
      var string = whitespace + 'a b c' + whitespace,
          expected = (index == 2 ? whitespace : '') + 'a b c' + (index == 1 ? whitespace : '');

      assert.strictEqual(_(string)[methodName](), expected);
    });

    it('`_.' + methodName + '` should return a wrapped value when explicitly chaining', function() {
      var string = whitespace + 'a b c' + whitespace;
      assert.ok(_(string).chain()[methodName]() instanceof _);
    });
  });
});