/**
 * @license
 * Copyright Google LLC 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.dev/license
 */

import {Observable, of, timer} from 'rxjs';
import {first, map} from 'rxjs/operators';
import {
  AbstractControl,
  AsyncValidator,
  AsyncValidatorFn,
  FormArray,
  FormControl,
  ValidationErrors,
  ValidatorFn,
  Validators,
} from '../index';

import {normalizeValidators} from '../src/validators';
import {useAutoTick, timeout} from '@angular/private/testing';

(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 new Observable((obs: any) => {
        const error = this.expected !== c.value ? this.error : null;
        obs.next(error);
        obs.complete();
      });
    }
  }

  describe('Validators', () => {
    useAutoTick();

    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 small float number validation', () => {
        expect(Validators.min(1.2)(new FormControl(1.25))).toBeNull();
      });

      it('should not error on equal float values', () => {
        expect(Validators.min(1.25)(new FormControl(1.25))).toBeNull();
      });

      it('should return a validation error on big values', () => {
        expect(Validators.min(1.25)(new FormControl(1.2))).toEqual({
          'min': {'min': 1.25, 'actual': 1.2},
        });
      });

      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 not error on small float number validation', () => {
        expect(Validators.max(1.2)(new FormControl(1.15))).toBeNull();
      });

      it('should not error on equal float values', () => {
        expect(Validators.max(1.25)(new FormControl(1.25))).toBeNull();
      });

      it('should return a max validation error on decimal values', () => {
        expect(Validators.max(1.25)(new FormControl(1.3))).toEqual({
          'max': {'max': 1.25, 'actual': 1.3},
        });
      });

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

      it('should return a max validation error 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());

      it('should not error on an object containing a length attribute that is zero', () => {
        expect(Validators.required(new FormControl({id: 1, length: 0, width: 0}))).toBeNull();
      });

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

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

      it('should not error on an object containing a size attribute that is zero', () => {
        expect(Validators.required(new FormControl({id: 1, size: 0, width: 0}))).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 empty array', () => {
        expect(Validators.minLength(2)(new FormControl([]))).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},
        });
      });

      it('should always return null with numeric values', () => {
        expect(Validators.minLength(1)(new FormControl(0))).toBeNull();
        expect(Validators.minLength(1)(new FormControl(1))).toBeNull();
        expect(Validators.minLength(1)(new FormControl(-1))).toBeNull();
        expect(Validators.minLength(1)(new FormControl(+1))).toBeNull();
      });

      it('should trigger validation for an object that contains numeric length property', () => {
        const value = {length: 5, someValue: [1, 2, 3, 4, 5]};
        expect(Validators.minLength(1)(new FormControl(value))).toBeNull();
        expect(Validators.minLength(10)(new FormControl(value))).toEqual({
          'minlength': {'requiredLength': 10, 'actualLength': 5},
        });
      });

      it('should return null when passing a boolean', () => {
        expect(Validators.minLength(1)(new FormControl(true))).toBeNull();
        expect(Validators.minLength(1)(new FormControl(false))).toBeNull();
      });

      it('should trigger validation for an object that contains numeric size property', () => {
        const value = new Set([1, 2, 3, 4, 5]);
        expect(Validators.minLength(1)(new FormControl(value))).toBeNull();
        expect(Validators.minLength(10)(new FormControl(value))).toEqual({
          'minlength': {'requiredLength': 10, 'actualLength': 5},
        });
      });

      it('should not error on empty set', () => {
        const value = new Set();
        expect(Validators.minLength(1)(new FormControl(value))).toBeNull();
      });
    });

    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},
        });
      });

      it('should always return null with numeric values', () => {
        expect(Validators.maxLength(1)(new FormControl(0))).toBeNull();
        expect(Validators.maxLength(1)(new FormControl(1))).toBeNull();
        expect(Validators.maxLength(1)(new FormControl(-1))).toBeNull();
        expect(Validators.maxLength(1)(new FormControl(+1))).toBeNull();
      });

      it('should trigger validation for an object that contains numeric length property', () => {
        const value = {length: 5, someValue: [1, 2, 3, 4, 5]};
        expect(Validators.maxLength(10)(new FormControl(value))).toBeNull();
        expect(Validators.maxLength(1)(new FormControl(value))).toEqual({
          'maxlength': {'requiredLength': 1, 'actualLength': 5},
        });
      });

      it('should trigger validation for an object that contains numeric size property', () => {
        const value = new Set([1, 2, 3, 4, 5]);
        expect(Validators.maxLength(10)(new FormControl(value))).toBeNull();
        expect(Validators.maxLength(1)(new FormControl(value))).toEqual({
          'maxlength': {'requiredLength': 1, 'actualLength': 5},
        });
      });

      it('should return null when passing a boolean', () => {
        expect(Validators.maxLength(1)(new FormControl(true))).toBeNull();
        expect(Validators.maxLength(1)(new FormControl(false))).toBeNull();
      });
    });

    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', async () => {
          const v = Validators.composeAsync([
            promiseValidator({'one': true}),
            promiseValidator({'two': true}),
          ])!;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        it('should wait for all validators before setting errors', async () => {
          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} | null | undefined = undefined;
          (v(new FormControl('invalid')) as Observable<ValidationErrors | null>)
            .pipe(first())
            .subscribe((errors: {[key: string]: any} | null) => (errorMap = errors));

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

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