/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {AbstractControl, Control, ControlArray, ControlGroup, Validators} from '@angular/common/src/forms-deprecated';
import {fakeAsync, flushMicrotasks, tick} from '@angular/core/testing';
import {afterEach, beforeEach, ddescribe, describe, expect, iit, it, xit} from '@angular/core/testing/testing_internal';
import {Observable} from 'rxjs/Observable';

import {EventEmitter} from '../../src/facade/async';
import {normalizeAsyncValidator} from '../../src/forms-deprecated/directives/normalize_validator';

export function main() {
  function validator(key: string, error: any) {
    return function(c: AbstractControl) {
      var r = {};
      (r as any)[key] = error;
      return r;
    };
  }

  class AsyncValidatorDirective {
    constructor(private expected: string, private error: any) {}

    validate(c: any): {[key: string]: any;} {
      return Observable.create((obs: any) => {
        const error = this.expected !== c.value ? this.error : null;
        obs.next(error);
        obs.complete();
      });
    }
  }

  describe('Validators', () => {
    describe('required', () => {
      it('should error on an empty string',
         () => { expect(Validators.required(new Control(''))).toEqual({'required': true}); });

      it('should error on null',
         () => { expect(Validators.required(new Control(null))).toEqual({'required': true}); });

      it('should not error on a non-empty string',
         () => { expect(Validators.required(new Control('not empty'))).toEqual(null); });

      it('should accept zero as valid',
         () => { expect(Validators.required(new Control(0))).toEqual(null); });
    });

    describe('minLength', () => {
      it('should not error on an empty string',
         () => { expect(Validators.minLength(2)(new Control(''))).toEqual(null); });

      it('should not error on null',
         () => { expect(Validators.minLength(2)(new Control(null))).toEqual(null); });

      it('should not error on valid strings',
         () => { expect(Validators.minLength(2)(new Control('aa'))).toEqual(null); });

      it('should error on short strings', () => {
        expect(Validators.minLength(2)(new Control('a'))).toEqual({
          'minlength': {'requiredLength': 2, 'actualLength': 1}
        });
      });
    });

    describe('maxLength', () => {
      it('should not error on an empty string',
         () => { expect(Validators.maxLength(2)(new Control(''))).toEqual(null); });

      it('should not error on null',
         () => { expect(Validators.maxLength(2)(new Control(null))).toEqual(null); });

      it('should not error on valid strings',
         () => { expect(Validators.maxLength(2)(new Control('aa'))).toEqual(null); });

      it('should error on long strings', () => {
        expect(Validators.maxLength(2)(new Control('aaa'))).toEqual({
          'maxlength': {'requiredLength': 2, 'actualLength': 3}
        });
      });
    });

    describe('pattern', () => {
      it('should not error on an empty string',
         () => { expect(Validators.pattern('[a-zA-Z ]*')(new Control(''))).toEqual(null); });

      it('should not error on null',
         () => { expect(Validators.pattern('[a-zA-Z ]*')(new Control(null))).toEqual(null); });

      it('should not error on valid strings',
         () => { expect(Validators.pattern('[a-zA-Z ]*')(new Control('aaAA'))).toEqual(null); });

      it('should error on failure to match string', () => {
        expect(Validators.pattern('[a-zA-Z ]*')(new Control('aaa0'))).toEqual({
          'pattern': {'requiredPattern': '^[a-zA-Z ]*$', 'actualValue': 'aaa0'}
        });
      });
    });

    it('should normalize and evaluate async validator-directives correctly', fakeAsync(() => {
         const c = Validators.composeAsync(
             [normalizeAsyncValidator(new AsyncValidatorDirective('expected', {'one': true}))]);

         let value: any = null;
         c(new Control()).then((v: any) => value = v);
         tick(1);

         expect(value).toEqual({'one': true});
       }));

    describe('compose', () => {
      it('should return null when given null',
         () => { expect(Validators.compose(null)).toBe(null); });

      it('should collect errors from all the validators', () => {
        var c = Validators.compose([validator('a', true), validator('b', true)]);
        expect(c(new Control(''))).toEqual({'a': true, 'b': true});
      });

      it('should run validators left to right', () => {
        var c = Validators.compose([validator('a', 1), validator('a', 2)]);
        expect(c(new Control(''))).toEqual({'a': 2});
      });

      it('should return null when no errors', () => {
        var c = Validators.compose([Validators.nullValidator, Validators.nullValidator]);
        expect(c(new Control(''))).toEqual(null);
      });

      it('should ignore nulls', () => {
        var c = Validators.compose([null, Validators.required]);
        expect(c(new Control(''))).toEqual({'required': true});
      });
    });

    describe('composeAsync', () => {
      function asyncValidator(expected: any /** TODO #9100 */, response: any /** TODO #9100 */) {
        return (c: any /** TODO #9100 */) => {
          var emitter = new EventEmitter();
          var res = c.value != expected ? response : null;
          Promise.resolve(null).then(() => {
            emitter.emit(res);
            // this is required because of a bug in ObservableWrapper
            // where callComplete can fire before callEmit
            // remove this one the bug is fixed
            setTimeout(() => { emitter.complete(); }, 0);
          });

          return emitter;
        };
      }

      it('should return null when given null',
         () => { expect(Validators.composeAsync(null)).toEqual(null); });

      it('should collect errors from all the validators', fakeAsync(() => {
           var c = Validators.composeAsync([
             asyncValidator('expected', {'one': true}), asyncValidator('expected', {'two': true})
           ]);

           var value: any /** TODO #9100 */ = null;
           (<Promise<any>>c(new Control('invalid'))).then(v => value = v);

           tick(1);

           expect(value).toEqual({'one': true, 'two': true});
         }));

      it('should return null when no errors', fakeAsync(() => {
           var c = Validators.composeAsync([asyncValidator('expected', {'one': true})]);

           var value: any /** TODO #9100 */ = null;
           (<Promise<any>>c(new Control('expected'))).then(v => value = v);

           tick(1);

           expect(value).toEqual(null);
         }));

      it('should ignore nulls', fakeAsync(() => {
           var c = Validators.composeAsync([asyncValidator('expected', {'one': true}), null]);

           var value: any /** TODO #9100 */ = null;
           (<Promise<any>>c(new Control('invalid'))).then(v => value = v);

           tick(1);

           expect(value).toEqual({'one': true});
         }));
    });
  });
}