import {
  ddescribe,
  describe,
  it,
  iit,
  xit,
  expect,
  beforeEach,
  afterEach,
  fakeAsync,
  tick,
  el
} from 'angular2/testing_internal';
import {ControlGroup, Control, Validators, AbstractControl, ControlArray} from 'angular2/common';
import {PromiseWrapper} from 'angular2/src/facade/promise';
import {EventEmitter, ObservableWrapper, TimerWrapper} from 'angular2/src/facade/async';
import {CONST_EXPR} from 'angular2/src/facade/lang';

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

  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 short strings", () => {
        expect(Validators.maxLength(2)(new Control("aaa")))
            .toEqual({"maxlength": {"requiredLength": 2, "actualLength": 3}});
      });
    });

    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, response) {
        return (c) => {
          var emitter = new EventEmitter();
          var res = c.value != expected ? response : null;

          PromiseWrapper.scheduleMicrotask(() => {
            ObservableWrapper.callEmit(emitter, res);
            // this is required because of a bug in ObservableWrapper
            // where callComplete can fire before callEmit
            // remove this one the bug is fixed
            TimerWrapper.setTimeout(() => { ObservableWrapper.callComplete(emitter); }, 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 = null;
           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 = null;
           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 = null;
           c(new Control("invalid")).then(v => value = v);

           tick(1);

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