import {ChangeDetectorRef, Component, Input, OnDestroy, OnInit, ViewChild} from "@angular/core";
import {FormArray, FormBuilder, FormGroup, Validators} from "@angular/forms";
import {User} from "../../login/utils/helper.class";
import {UserManagementService} from "../../services/user-management.service";
import {of, Subscription} from "rxjs";
import {NotificationService} from "../notification.service";
import {Notification} from "../notifications";
import {InputComponent, Option} from "../../sharedComponents/input/input.component";
import {properties} from "../../../../environments/environment";

declare var UIkit;

@Component({
  selector: '[notify-form]',
  template: `
    <form *ngIf="user && form" [formGroup]="form">
      <ng-template [ngIf]="form.get('notify')">
        <mat-checkbox formControlName="notify" class="uk-text-small">{{label}}</mat-checkbox>
        <div [class.uk-hidden]="!form.get('notify').value" class="uk-grid uk-grid-small uk-margin-top" uk-grid>
          <div style="margin-left: -5px;">
            <notification-user [name]="user.firstname" [surname]="user.lastname"></notification-user>
          </div>
          <div dashboard-input [formInput]="form.get('message')"
               rows="3" placeholder="Send a notification"
               type="textarea" class="uk-width-expand"></div>
        </div>
      </ng-template>
      <ng-template [ngIf]="form.get('groups') && availableGroups">
        <div class="uk-grid uk-grid-small" uk-grid>
          <span style="opacity: 0.5;" class="uk-text-bold uk-margin-small-top">Send to: </span>
          <div [class.uk-hidden]="focused" class="uk-width-expand uk-margin-small" (click)="focus($event)">
            <span *ngIf="groups.length === 0" class="placeholder">Add a recipient</span>
            <span *ngIf="groups.length > 0" [attr.uk-tooltip]="(groups.length > 2)?groups.join(', '):null">
              {{groups.slice(0, 2).join(', ')}}
              <span *ngIf="groups.length > 2" style="opacity: 0.5; margin-left: 4px">+ {{groups.length - 2}}  more</span>
            </span>
          </div>
          <div #recipients dashboard-input type="chips" [options]="availableGroups" [class.uk-hidden]="!focused"
               panelClass="uk-text-small" [showOptionsOnEmpty]="false"
               inputClass="input-borderless" class="uk-width-expand" (focusEmitter)="onFocus($event)" [panelWidth]="400"
               [smallChip]="true" [gridSmall]="true" [formInput]="form.get('groups')">
          </div>
        </div>
        <div class="uk-grid uk-grid-small uk-margin-top" uk-grid>
          <div>
            <notification-user [name]="user.firstname" [surname]="user.lastname"></notification-user>
          </div>
          <div dashboard-input [formInput]="form.get('message')"
               [rows]="4" placeholder="Send a notification"
               type="textarea" class="uk-width-expand">
            <div options class="uk-margin-top uk-width-1-1 uk-flex uk-flex-right">
              <button *ngIf="!sending && message" (click)="sendNotification()"
                      class="uk-button uk-button-small uk-button-secondary">Send</button>
              <button *ngIf="sending || !message" (click)="sendNotification()"
                      class="uk-button uk-button-small uk-button-secondary" disabled>Send</button>
            </div>
          </div>
        </div>
      </ng-template>
    </form>
  `
})
export class NotifyFormComponent implements OnInit, OnDestroy {
  @Input()
  public label: string = 'Notify Managers';
  public form: FormGroup;
  @Input()
  public availableGroups: Option[] = null;
  @Input() service: string;
  public user: User;
  public focused: boolean = false;
  public groups: string[] = [];
  @ViewChild('recipients', { static: false }) recipients: InputComponent;
  private notification: Notification;
  private subscriptions: any[] = [];
  public sending: boolean = false;
  
  constructor(private fb: FormBuilder,
              private cdr: ChangeDetectorRef,
              private userManagementService: UserManagementService,
              private notificationService: NotificationService) {
  }
  
  ngOnInit() {
    this.reset();
    this.subscriptions.push(this.userManagementService.getUserInfo().subscribe(user => {
      this.user = user;
    }));
  }
  
  ngOnDestroy() {
    this.subscriptions.forEach(subscription => {
      if (subscription instanceof Subscription) {
        subscription.unsubscribe();
      }
    })
  }
  
  reset(message: string = null) {
    if (!this.availableGroups) {
      this.form = this.fb.group({
        notify: this.fb.control(properties.environment !== 'production'),
        message: this.fb.control(message)
      });
      this.subscriptions.push(this.form.get('notify').valueChanges.subscribe(value => {
        if (value) {
          this.form.get('message').markAsUntouched();
        }
      }));
    } else {
      this.form = this.fb.group({
        groups: this.fb.array([]),
        message: this.fb.control(message)
      });
      this.groups = [];
      this.subscriptions.push(this.form.get('groups').valueChanges.subscribe(value => {
        this.groups = [];
        value.forEach(group => {
          this.groups.push(this.availableGroups.find(available => available.value === group).label);
        });
        this.cdr.detectChanges();
      }));
    }
  }
  
  sendNotification(notification: Notification = null) {
    if (this.message) {
      if(notification === null) {
        notification = new Notification('CUSTOM', [this.service], null, null);
        notification.groups = this.groupsAsFromArray.value;
        this.sending = true;
      }
      this.notification = notification;
      this.notification.message = this.form.value.message;
      // TODO remove
      this.notification.name = this.user.firstname;
      this.notification.surname = this.user.lastname;
      this.subscriptions.push(this.notificationService.sendNotification(this.notification).subscribe(notification => {
        this.sending = false;
        UIkit.notification('A notification has been <b>sent</b> successfully', {
          status: 'success',
          timeout: 6000,
          pos: 'bottom-right'
        });
        this.reset();
      }, error => {
        this.sending = false;
        UIkit.notification('An error has occurred. Please try again later', {
          status: 'danger',
          timeout: 6000,
          pos: 'bottom-right'
        });
        this.reset();
      }));
    }
  }
  
  get groupsAsFromArray(): FormArray {
    return this.form.get('groups')?(<FormArray>this.form.get('groups')):null;
  }
  
  get message(): string {
    if ((this.form.get('notify') && !this.form.get('notify').value) || (this.groupsAsFromArray && this.groupsAsFromArray.length === 0)) {
      return null;
    }
    return this.form.get('message').value;
  }
  
  onFocus(event: boolean) {
    this.focused = event;
  }
  
  focus(event) {
    this.focused = true;
    event.stopPropagation();
    this.cdr.detectChanges();
    setTimeout(() => {
      this.recipients.searchInput.nativeElement.focus();
    }, 0);
  }
}