///
/// Copyright © 2016-2019 The Thingsboard Authors
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///

import { BaseData, HasId } from '@shared/models/base-data';
import { FormGroup, NgForm } from '@angular/forms';
import { PageComponent } from '@shared/components/page.component';
import { EventEmitter, Input, OnInit, Output, ViewChild } from '@angular/core';
import { Store } from '@ngrx/store';
import { AppState } from '@core/core.state';
import { EntityAction } from '@home/models/entity/entity-component.models';
import { EntityTableConfig } from '@home/models/entity/entities-table-config.models';

export abstract class EntityComponent<T extends BaseData<HasId>> extends PageComponent implements OnInit {

  entityValue: T;
  entityForm: FormGroup;

  @ViewChild('entityNgForm', {static: true}) entityNgForm: NgForm;

  isEditValue: boolean;

  @Input()
  set isEdit(isEdit: boolean) {
    this.isEditValue = isEdit;
    this.updateFormState();
  }

  get isEdit() {
    return this.isEditValue;
  }

  get isAdd(): boolean {
    return this.entityValue && !this.entityValue.id;
  }

  @Input()
  set entity(entity: T) {
    this.entityValue = entity;
    if (this.entityForm) {
      this.entityForm.reset();
      this.updateForm(entity);
    }
  }

  get entity(): T {
    return this.entityValue;
  }

  @Input()
  entitiesTableConfig: EntityTableConfig<T>;

  @Output()
  entityAction = new EventEmitter<EntityAction<T>>();

  protected constructor(protected store: Store<AppState>) {
    super(store);
  }

  ngOnInit() {
    this.entityForm = this.buildForm(this.entityValue);
  }

  onEntityAction($event: Event, action: string) {
    const entityAction = {event: $event, action, entity: this.entity} as EntityAction<T>;
    let handled = false;
    if (this.entitiesTableConfig) {
      handled = this.entitiesTableConfig.onEntityAction(entityAction);
    }
    if (!handled) {
      this.entityAction.emit(entityAction);
    }
  }

  updateFormState() {
    if (this.entityForm) {
      if (this.isEditValue) {
        this.entityForm.enable({emitEvent: false});
      } else {
        this.entityForm.disable({emitEvent: false});
      }
    }
  }

  entityFormValue() {
    const formValue = this.entityForm ? {...this.entityForm.value} : {};
    return this.prepareFormValue(formValue);
  }

  prepareFormValue(formValue: any): any {
    return formValue;
  }

  abstract buildForm(entity: T): FormGroup;

  abstract updateForm(entity: T);

}