import { ChangeDetectorRef, Component, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { async, ComponentFixture, inject, TestBed, } from '@angular/core/testing';
import { CommonModule } from '@angular/common';
import { BrowserModule } from '@angular/platform-browser';
import { FormControl, FormsModule, ReactiveFormsModule } from '@angular/forms';
import 'rxjs/add/observable/of';
import {
  DynamicFormArrayModel,
  DynamicFormControlEvent,
  DynamicFormControlModel,
  DynamicFormValidationService,
  DynamicInputModel
} from '@ng-dynamic-forms/core';
import { Store } from '@ngrx/store';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import { TranslateModule } from '@ngx-translate/core';

import { FormComponent } from './form.component';
import { FormService } from './form.service';
import { FormBuilderService } from './builder/form-builder.service';
import { FormState } from './form.reducer';
import { FormChangeAction, FormStatusChangeAction } from './form.actions';
import { MockStore } from '../testing/mock-store';
import { FormFieldMetadataValueObject } from './builder/models/form-field-metadata-value.model';
import { GLOBAL_CONFIG } from '../../../config';

function createTestComponent<T>(html: string, type: { new(...args: any[]): T }): ComponentFixture<T> {
  TestBed.overrideComponent(type, {
    set: {template: html}
  });
  const fixture = TestBed.createComponent(type);

  fixture.detectChanges();
  return fixture as ComponentFixture<T>;
}

export const TEST_FORM_MODEL = [

  new DynamicInputModel(
    {
      id: 'dc_title',
      label: 'Title',
      placeholder: 'Title',
      validators: {
        required: null
      },
      errorMessages: {
        required: 'You must enter a main title for this item.'
      }
    }
  ),

  new DynamicInputModel(
    {
      id: 'dc_title_alternative',
      label: 'Other Titles',
      placeholder: 'Other Titles',
    }
  ),

  new DynamicInputModel(
    {
      id: 'dc_publisher',
      label: 'Publisher',
      placeholder: 'Publisher',
    }
  ),

  new DynamicInputModel(
    {
      id: 'dc_identifier_citation',
      label: 'Citation',
      placeholder: 'Citation',
    }
  ),

  new DynamicInputModel(
    {
      id: 'dc_identifier_issn',
      label: 'Identifiers',
      placeholder: 'Identifiers',
    }
  ),
];

export const TEST_FORM_MODEL_WITH_ARRAY = [
  new DynamicFormArrayModel({

    id: 'bootstrapFormArray',
    initialCount: 1,
    label: 'Form Array',
    groupFactory: () => {
      return [
        new DynamicInputModel({

          id: 'bootstrapArrayGroupInput',
          placeholder: 'example array group input',
          readOnly: false
        })
      ];
    }
  })
];

describe('FormComponent test suite', () => {
  let testComp: TestComponent;
  let formComp: FormComponent;
  let testFixture: ComponentFixture<TestComponent>;
  let formFixture: ComponentFixture<FormComponent>;

  const config = {
    form: {
      validatorMap: {
        required: 'required',
        regex: 'pattern'
      }
    }
  } as any;
  const formState: FormState = {
    testForm: {
      data: {
        dc_title: null,
        dc_title_alternative: null,
        dc_publisher: null,
        dc_identifier_citation: null,
        dc_identifier_issn: null
      },
      valid: false,
      errors: []
    }
  };
  let html;

  const store: MockStore<FormState> = new MockStore<FormState>(formState);

  // async beforeEach
  beforeEach(async(() => {

    TestBed.configureTestingModule({
      imports: [
        BrowserModule,
        CommonModule,
        FormsModule,
        ReactiveFormsModule,
        NgbModule.forRoot(),
        TranslateModule.forRoot()
      ],
      declarations: [
        FormComponent,
        TestComponent,
      ], // declare the test component
      providers: [
        ChangeDetectorRef,
        DynamicFormValidationService,
        FormBuilderService,
        FormComponent,
        FormService,
        {provide: GLOBAL_CONFIG, useValue: config},
        {
          provide: Store, useValue: store
        }
      ],
      schemas: [CUSTOM_ELEMENTS_SCHEMA]
    });

  }));

  describe('', () => {
    // synchronous beforeEach
    beforeEach(() => {
      html = `
        <ds-form *ngIf="formModel" #formRef="formComponent"
                 [formId]="formId"
                 [formModel]="formModel"
                 [displaySubmit]="displaySubmit"></ds-form>`;

      testFixture = createTestComponent(html, TestComponent) as ComponentFixture<TestComponent>;
      testComp = testFixture.componentInstance;
    });

    it('should create FormComponent', inject([FormComponent], (app: FormComponent) => {

      expect(app).toBeDefined();
    }));
  });

  describe('', () => {
    beforeEach(() => {

      formFixture = TestBed.createComponent(FormComponent);
      formComp = formFixture.componentInstance; // FormComponent test instance
      formComp.formId = 'testForm';
      formComp.formModel = TEST_FORM_MODEL;
      formComp.displaySubmit = false;
      formFixture.detectChanges();
      spyOn(store, 'dispatch');
    });

    afterEach(() => {
      formFixture.destroy();
      formComp = null;
    });

    it('should dispatch a FormStatusChangeAction when Form group status changes', () => {
      const control = formComp.formGroup.get(['dc_title']);
      control.setValue('Test Title');

      expect(store.dispatch).toHaveBeenCalledWith(new FormStatusChangeAction('testForm', formComp.formGroup.valid));

    });

    it('should display form errors when errors are added to the state', () => {
      const errors = [{
        fieldId: 'dc_title',
        message: 'error.validation.required'
      }];

      formState.testForm.errors = errors;
      store.nextState(formState);
      formFixture.detectChanges();

      expect((formComp as any).formErrors).toEqual(errors);

    });

    it('should remove form errors when errors are empty in the state', () => {
      (formComp as any).formErrors = [{
        fieldId: 'dc_title',
        message: 'error.validation.required'
      }];
      const errors = [];

      formState.testForm.errors = errors;
      store.nextState(formState);
      formFixture.detectChanges();

      expect((formComp as any).formErrors).toEqual(errors);

    });

    it('should dispatch FormChangeAction on form change', inject([FormBuilderService], (service: FormBuilderService) => {
      const event = {
        $event: new FormFieldMetadataValueObject('Test Title'),
        context: null,
        control: formComp.formGroup.get('dc_title'),
        group: formComp.formGroup,
        model: formComp.formModel[0],
        type: 'change'
      } as DynamicFormControlEvent;

      spyOn(formComp.change, 'emit');

      formComp.onChange(event);

      expect(store.dispatch).toHaveBeenCalledWith(new FormChangeAction('testForm', service.getValueFromModel(formComp.formModel)));
      expect(formComp.change.emit).toHaveBeenCalled();
    }));

    it('should emit change on form change', inject([FormBuilderService], (service: FormBuilderService) => {
      const event = {
        $event: new FormFieldMetadataValueObject('Test Title'),
        context: null,
        control: formComp.formGroup.get('dc_title'),
        group: formComp.formGroup,
        model: formComp.formModel[0],
        type: 'change'
      } as DynamicFormControlEvent;

      spyOn(formComp.change, 'emit');

      formComp.onChange(event);

      expect(formComp.change.emit).toHaveBeenCalled();
    }));

    it('should not emit change Event on form change when emitChange is false', inject([FormBuilderService], (service: FormBuilderService) => {
      const event = {
        $event: new FormFieldMetadataValueObject('Test Title'),
        context: null,
        control: formComp.formGroup.get('dc_title'),
        group: formComp.formGroup,
        model: formComp.formModel[0],
        type: 'change'
      } as DynamicFormControlEvent;

      formComp.emitChange = false;
      spyOn(formComp.change, 'emit');

      formComp.onChange(event);

      expect(formComp.change.emit).not.toHaveBeenCalled();
    }));

    it('should emit blur Event on blur', () => {
      const event = {
        $event: new FocusEvent('blur'),
        context: null,
        control: formComp.formGroup.get('dc_title'),
        group: formComp.formGroup,
        model: formComp.formModel[0],
        type: 'blur'
      } as DynamicFormControlEvent;

      spyOn(formComp.blur, 'emit');

      formComp.onBlur(event);

      expect(formComp.blur.emit).toHaveBeenCalled();
    });

    it('should emit focus Event on focus', () => {
      const event = {
        $event: new FocusEvent('focus'),
        context: null,
        control: formComp.formGroup.get('dc_title'),
        group: formComp.formGroup,
        model: formComp.formModel[0],
        type: 'focus'
      } as DynamicFormControlEvent;

      spyOn(formComp.focus, 'emit');

      formComp.onFocus(event);

      expect(formComp.focus.emit).toHaveBeenCalled();
    });

    it('should return Observable of form status', () => {

      const control = formComp.formGroup.get(['dc_title']);
      control.setValue('Test Title');
      formState.testForm.valid = true;
      store.nextState(formState);
      formFixture.detectChanges();

      formComp.isValid().subscribe((valid) => {
        expect(valid).toBe(true);
      });
    });

    it('should emit submit Event on form submit whether the form is valid', () => {

      const control = formComp.formGroup.get(['dc_title']);
      control.setValue('Test Title');
      formState.testForm.valid = true;
      spyOn(formComp.submit, 'emit');

      store.nextState(formState);
      formFixture.detectChanges();

      formComp.onSubmit();
      expect(formComp.submit.emit).toHaveBeenCalled();
    });

    it('should not emit submit Event on form submit whether the form is not valid', () => {

      spyOn((formComp as any).formService, 'validateAllFormFields');

      store.nextState(formState);
      formFixture.detectChanges();

      formComp.onSubmit();
      expect((formComp as any).formService.validateAllFormFields).toHaveBeenCalled();
    });

    it('should reset form group', () => {

      spyOn(formComp.formGroup, 'reset');

      formComp.reset();

      expect(formComp.formGroup.reset).toHaveBeenCalled();
    });
  });

  describe('', () => {
    beforeEach(() => {

      formFixture = TestBed.createComponent(FormComponent);
      formComp = formFixture.componentInstance; // FormComponent test instance
      formComp.formId = 'testFormArray';
      formComp.formModel = TEST_FORM_MODEL_WITH_ARRAY;
      formComp.displaySubmit = false;
      formFixture.detectChanges();
      spyOn(store, 'dispatch');
    });

    afterEach(() => {
      formFixture.destroy();
      formComp = null;
    });

    it('should return ReadOnly property from array item', inject([FormBuilderService], (service: FormBuilderService) => {
      const readOnly = formComp.isItemReadOnly(formComp.formModel[0] as DynamicFormArrayModel, 0);

      expect(readOnly).toBe(false);
    }));

    it('should dispatch FormChangeAction when an item has been added to an array', inject([FormBuilderService], (service: FormBuilderService) => {
      formComp.insertItem(new Event('click'), formComp.formModel[0] as DynamicFormArrayModel, 1);

      expect(store.dispatch).toHaveBeenCalledWith(new FormChangeAction('testFormArray', service.getValueFromModel(formComp.formModel)));
    }));

    it('should emit addArrayItem Event when an item has been added to an array', inject([FormBuilderService], (service: FormBuilderService) => {
      spyOn(formComp.addArrayItem, 'emit');

      formComp.insertItem(new Event('click'), formComp.formModel[0] as DynamicFormArrayModel, 1);

      expect(formComp.addArrayItem.emit).toHaveBeenCalled();
    }));

    it('should dispatch FormChangeAction when an item has been removed from an array', inject([FormBuilderService], (service: FormBuilderService) => {
      formComp.removeItem(new Event('click'), formComp.formModel[0] as DynamicFormArrayModel, 1);

      expect(store.dispatch).toHaveBeenCalledWith(new FormChangeAction('testFormArray', service.getValueFromModel(formComp.formModel)));
    }));

    it('should emit removeArrayItem Event when an item has been removed from an array', inject([FormBuilderService], (service: FormBuilderService) => {
      spyOn(formComp.removeArrayItem, 'emit');

      formComp.removeItem(new Event('click'), formComp.formModel[0] as DynamicFormArrayModel, 1);

      expect(formComp.removeArrayItem.emit).toHaveBeenCalled();
    }));
  })
});

// declare a test component
@Component({
  selector: 'ds-test-cmp',
  template: ``
})
class TestComponent {

  public formId;
  public formModel: DynamicFormControlModel[];
  public displaySubmit = false;

  constructor() {
    this.formId = 'testForm';
    this.formModel = TEST_FORM_MODEL;
  }

}