/**
 * @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 {fakeAsync, tick} from '@angular/core/testing';
import {describe, expect, it} from '@angular/core/testing/src/testing_internal';
import {AbstractControl, AsyncValidatorFn, FormArray, FormControl, Validators} from '@angular/forms';
import {normalizeAsyncValidator} from '@angular/forms/src/directives/normalize_validator';
import {AsyncValidator, ValidationErrors, ValidatorFn} from '@angular/forms/src/directives/validators';
import {Observable, of , timer} from 'rxjs';
import {first, map} from 'rxjs/operators';

(function() {
  function validator(key: string, error: any): ValidatorFn {
    return (c: AbstractControl) => {
      const r: ValidationErrors = {};
      r[key] = error;
      return r;
    };
  }

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

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

  describe('Validators', () => {
    describe('min', () => {
      it('should not error on an empty string',
         () => { expect(Validators.min(2)(new FormControl(''))).toBeNull(); });

      it('should not error on null',
         () => { expect(Validators.min(2)(new FormControl(null))).toBeNull(); });

      it('should not error on undefined',
         () => { expect(Validators.min(2)(new FormControl(undefined))).toBeNull(); });

      it('should return null if NaN after parsing',
         () => { expect(Validators.min(2)(new FormControl('a'))).toBeNull(); });

      it('should return a validation error on small values', () => {
        expect(Validators.min(2)(new FormControl(1))).toEqual({'min': {'min': 2, 'actual': 1}});
      });

      it('should return a validation error on small values converted from strings', () => {
        expect(Validators.min(2)(new FormControl('1'))).toEqual({'min': {'min': 2, 'actual': '1'}});
      });

      it('should not error on big values',
         () => { expect(Validators.min(2)(new FormControl(3))).toBeNull(); });

      it('should not error on equal values',
         () => { expect(Validators.min(2)(new FormControl(2))).toBeNull(); });

      it('should not error on equal values when value is string',
         () => { expect(Validators.min(2)(new FormControl('2'))).toBeNull(); });

      it('should validate as expected when min value is a string', () => {
        expect(Validators.min('2' as any)(new FormControl(1))).toEqual({
          'min': {'min': '2', 'actual': 1}
        });
      });

      it('should return null if min value is undefined',
         () => { expect(Validators.min(undefined as any)(new FormControl(3))).toBeNull(); });

      it('should return null if min value is null',
         () => { expect(Validators.min(null as any)(new FormControl(3))).toBeNull(); });
    });

    describe('max', () => {
      it('should not error on an empty string',
         () => { expect(Validators.max(2)(new FormControl(''))).toBeNull(); });

      it('should not error on null',
         () => { expect(Validators.max(2)(new FormControl(null))).toBeNull(); });

      it('should not error on undefined',
         () => { expect(Validators.max(2)(new FormControl(undefined))).toBeNull(); });

      it('should return null if NaN after parsing',
         () => { expect(Validators.max(2)(new FormControl('aaa'))).toBeNull(); });

      it('should return a validation error on big values', () => {
        expect(Validators.max(2)(new FormControl(3))).toEqual({'max': {'max': 2, 'actual': 3}});
      });

      it('should return a validation error on big values converted from strings', () => {
        expect(Validators.max(2)(new FormControl('3'))).toEqual({'max': {'max': 2, 'actual': '3'}});
      });

      it('should not error on small values',
         () => { expect(Validators.max(2)(new FormControl(1))).toBeNull(); });

      it('should not error on equal values',
         () => { expect(Validators.max(2)(new FormControl(2))).toBeNull(); });

      it('should not error on equal values when value is string',
         () => { expect(Validators.max(2)(new FormControl('2'))).toBeNull(); });

      it('should validate as expected when max value is a string', () => {
        expect(Validators.max('2' as any)(new FormControl(3))).toEqual({
          'max': {'max': '2', 'actual': 3}
        });
      });

      it('should return null if max value is undefined',
         () => { expect(Validators.max(undefined as any)(new FormControl(3))).toBeNull(); });

      it('should return null if max value is null',
         () => { expect(Validators.max(null as any)(new FormControl(3))).toBeNull(); });
    });


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

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

      it('should not error on undefined', () => {
        expect(Validators.required(new FormControl(undefined))).toEqual({'required': true});
      });

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

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

      it('should error on an empty array',
         () => expect(Validators.required(new FormControl([]))).toEqual({'required': true}));

      it('should not error on a non-empty array',
         () => expect(Validators.required(new FormControl([1, 2]))).toBeNull());
    });

    describe('requiredTrue', () => {
      it('should error on false',
         () => expect(Validators.requiredTrue(new FormControl(false))).toEqual({'required': true}));

      it('should not error on true',
         () => expect(Validators.requiredTrue(new FormControl(true))).toBeNull());
    });

    describe('email', () => {
      it('should not error on an empty string',
         () => expect(Validators.email(new FormControl(''))).toBeNull());

      it('should not error on null',
         () => expect(Validators.email(new FormControl(null))).toBeNull());

      it('should error on invalid email',
         () => expect(Validators.email(new FormControl('some text'))).toEqual({'email': true}));

      it('should not error on valid email',
         () => expect(Validators.email(new FormControl('test@gmail.com'))).toBeNull());
    });

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

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

      it('should not error on undefined',
         () => { expect(Validators.minLength(2)(new FormControl(undefined))).toBeNull(); });

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

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

      it('should not error when FormArray has valid length', () => {
        const fa = new FormArray([new FormControl(''), new FormControl('')]);
        expect(Validators.minLength(2)(fa)).toBeNull();
      });

      it('should error when FormArray has invalid length', () => {
        const fa = new FormArray([new FormControl('')]);
        expect(Validators.minLength(2)(fa)).toEqual({
          'minlength': {'requiredLength': 2, 'actualLength': 1}
        });
      });
    });

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

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

      it('should not error on undefined',
         () => { expect(Validators.maxLength(2)(new FormControl(undefined))).toBeNull(); });

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

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

      it('should not error when FormArray has valid length', () => {
        const fa = new FormArray([new FormControl(''), new FormControl('')]);
        expect(Validators.maxLength(2)(fa)).toBeNull();
      });

      it('should error when FormArray has invalid length', () => {
        const fa = new FormArray([new FormControl(''), new FormControl('')]);
        expect(Validators.maxLength(1)(fa)).toEqual({
          'maxlength': {'requiredLength': 1, 'actualLength': 2}
        });
      });
    });

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

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

      it('should not error on undefined', () => {
        expect(Validators.pattern('[a-zA-Z ]+')(new FormControl(undefined))).toBeNull();
      });

      it('should not error on null value and "null" pattern',
         () => { expect(Validators.pattern('null')(new FormControl(null))).toBeNull(); });

      it('should not error on valid strings',
         () => expect(Validators.pattern('[a-zA-Z ]*')(new FormControl('aaAA'))).toBeNull());

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

      it('should accept RegExp object', () => {
        const pattern: RegExp = new RegExp('[a-zA-Z ]+');
        expect(Validators.pattern(pattern)(new FormControl('aaAA'))).toBeNull();
      });

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

      it('should not error on "null" pattern',
         () => expect(Validators.pattern(null !)(new FormControl('aaAA'))).toBeNull());

      it('should not error on "undefined" pattern',
         () => expect(Validators.pattern(undefined !)(new FormControl('aaAA'))).toBeNull());

      it('should work with pattern string containing both boundary symbols',
         () => expect(Validators.pattern('^[aA]*$')(new FormControl('aaAA'))).toBeNull());

      it('should work with pattern string containing only start boundary symbols',
         () => expect(Validators.pattern('^[aA]*')(new FormControl('aaAA'))).toBeNull());

      it('should work with pattern string containing only end boundary symbols',
         () => expect(Validators.pattern('[aA]*$')(new FormControl('aaAA'))).toBeNull());

      it('should work with pattern string not containing any boundary symbols',
         () => expect(Validators.pattern('[aA]*')(new FormControl('aaAA'))).toBeNull());
    });

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

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

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

      it('should return null when no errors', () => {
        const c = Validators.compose([Validators.nullValidator, Validators.nullValidator]) !;
        expect(c(new FormControl(''))).toBeNull();
      });

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

    describe('composeAsync', () => {

      describe('promises', () => {
        function promiseValidator(response: {[key: string]: any}): AsyncValidatorFn {
          return (c: AbstractControl) => {
            const res = c.value != 'expected' ? response : null;
            return Promise.resolve(res);
          };
        }

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

        it('should collect errors from all the validators', fakeAsync(() => {
             const v = Validators.composeAsync(
                 [promiseValidator({'one': true}), promiseValidator({'two': true})]) !;

             let errorMap: {[key: string]: any} = undefined !;
             (v(new FormControl('invalid')) as Observable<ValidationErrors|null>)
                 .pipe(first())
                 .subscribe((errors: {[key: string]: any}) => errorMap = errors);
             tick();

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

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

             let errorMap: {[key: string]: any} = undefined !;
             (v(new FormControl('invalid')) as Observable<ValidationErrors|null>)
                 .pipe(first())
                 .subscribe((errors: {[key: string]: any}) => errorMap = errors);
             tick();

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

        it('should return null when no errors', fakeAsync(() => {
             const v = Validators.composeAsync([promiseValidator({'one': true})]) !;

             let errorMap: {[key: string]: any} = undefined !;
             (v(new FormControl('expected')) as Observable<ValidationErrors|null>)
                 .pipe(first())
                 .subscribe((errors: {[key: string]: any}) => errorMap = errors);
             tick();

             expect(errorMap).toBeNull();
           }));

        it('should ignore nulls', fakeAsync(() => {
             const v = Validators.composeAsync([promiseValidator({'one': true}), null !]) !;

             let errorMap: {[key: string]: any} = undefined !;
             (v(new FormControl('invalid')) as Observable<ValidationErrors|null>)
                 .pipe(first())
                 .subscribe((errors: {[key: string]: any}) => errorMap = errors);
             tick();

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

      describe('observables', () => {
        function observableValidator(response: {[key: string]: any}): AsyncValidatorFn {
          return (c: AbstractControl) => {
            const res = c.value != 'expected' ? response : null;
            return of (res);
          };
        }

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

        it('should collect errors from all the validators', () => {
          const v = Validators.composeAsync(
              [observableValidator({'one': true}), observableValidator({'two': true})]) !;

          let errorMap: {[key: string]: any} = undefined !;
          (v(new FormControl('invalid')) as Observable<ValidationErrors|null>)
              .pipe(first())
              .subscribe((errors: {[key: string]: any}) => errorMap = errors);

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

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

          let errorMap: {[key: string]: any} = undefined !;
          (v(new FormControl('invalid')) as Observable<ValidationErrors|null>)
              .pipe(first())
              .subscribe((errors: {[key: string]: any}) => errorMap = errors) !;

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

        it('should return null when no errors', () => {
          const v = Validators.composeAsync([observableValidator({'one': true})]) !;

          let errorMap: {[key: string]: any} = undefined !;
          (v(new FormControl('expected')) as Observable<ValidationErrors|null>)
              .pipe(first())
              .subscribe((errors: {[key: string]: any}) => errorMap = errors);

          expect(errorMap).toBeNull();
        });

        it('should ignore nulls', () => {
          const v = Validators.composeAsync([observableValidator({'one': true}), null !]) !;

          let errorMap: {[key: string]: any} = undefined !;
          (v(new FormControl('invalid')) as Observable<ValidationErrors|null>)
              .pipe(first())
              .subscribe((errors: {[key: string]: any}) => errorMap = errors);

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

        it('should wait for all validators before setting errors', fakeAsync(() => {
             function getTimerObs(time: number, errorMap: {[key: string]: any}): AsyncValidatorFn {
               return (c: AbstractControl) => { return timer(time).pipe(map(() => errorMap)); };
             }

             const v = Validators.composeAsync(
                 [getTimerObs(100, {one: true}), getTimerObs(200, {two: true})]) !;

             let errorMap: {[key: string]: any} = undefined !;
             (v(new FormControl('invalid')) as Observable<ValidationErrors|null>)
                 .pipe(first())
                 .subscribe((errors: {[key: string]: any}) => errorMap = errors);

             tick(100);
             expect(errorMap).not.toBeDefined(
                 `Expected errors not to be set until all validators came back.`);

             tick(100);
             expect(errorMap).toEqual(
                 {one: true, two: true}, `Expected errors to merge once all validators resolved.`);
           }));
      });

    });
  });
})();