import { Component, OnInit } from '@angular/core';
import { FormControl, Validators } from '@angular/forms';

import { BsModalRef } from 'ngx-bootstrap/modal';
import { Subject } from 'rxjs';

import { RbdService } from '../../../shared/api/rbd.service';
import { CdFormGroup } from '../../../shared/forms/cd-form-group';
import { FinishedTask } from '../../../shared/models/finished-task';
import { NotificationService } from '../../../shared/services/notification.service';
import { TaskManagerService } from '../../../shared/services/task-manager.service';

@Component({
  selector: 'cd-rbd-snapshot-form',
  templateUrl: './rbd-snapshot-form.component.html',
  styleUrls: ['./rbd-snapshot-form.component.scss']
})
export class RbdSnapshotFormComponent implements OnInit {
  poolName: string;
  imageName: string;
  snapName: string;

  snapshotForm: CdFormGroup;

  editing = false;

  public onSubmit: Subject<string>;

  constructor(
    public modalRef: BsModalRef,
    private rbdService: RbdService,
    private taskManagerService: TaskManagerService,
    private notificationService: NotificationService
  ) {
    this.createForm();
  }

  createForm() {
    this.snapshotForm = new CdFormGroup({
      snapshotName: new FormControl('', {
        validators: [Validators.required]
      })
    });
  }

  ngOnInit() {
    this.onSubmit = new Subject();
  }

  setSnapName(snapName) {
    this.snapName = snapName;
    this.snapshotForm.get('snapshotName').setValue(snapName);
  }

  /**
   * Set the 'editing' flag. If set to TRUE, the modal dialog is in
   * 'Edit' mode, otherwise in 'Create' mode.
   * @param {boolean} editing
   */
  setEditing(editing: boolean = true) {
    this.editing = editing;
  }

  editAction() {
    const snapshotName = this.snapshotForm.getValue('snapshotName');
    const finishedTask = new FinishedTask();
    finishedTask.name = 'rbd/snap/edit';
    finishedTask.metadata = {
      pool_name: this.poolName,
      image_name: this.imageName,
      snapshot_name: snapshotName
    };
    this.rbdService
      .renameSnapshot(this.poolName, this.imageName, this.snapName, snapshotName)
      .toPromise()
      .then(() => {
        this.taskManagerService.subscribe(
          finishedTask.name,
          finishedTask.metadata,
          (asyncFinishedTask: FinishedTask) => {
            this.notificationService.notifyTask(asyncFinishedTask);
          }
        );
        this.modalRef.hide();
        this.onSubmit.next(this.snapName);
      })
      .catch(() => {
        this.snapshotForm.setErrors({ cdSubmitButton: true });
      });
  }

  createAction() {
    const snapshotName = this.snapshotForm.getValue('snapshotName');
    const finishedTask = new FinishedTask();
    finishedTask.name = 'rbd/snap/create';
    finishedTask.metadata = {
      pool_name: this.poolName,
      image_name: this.imageName,
      snapshot_name: snapshotName
    };
    this.rbdService
      .createSnapshot(this.poolName, this.imageName, snapshotName)
      .toPromise()
      .then(() => {
        this.taskManagerService.subscribe(
          finishedTask.name,
          finishedTask.metadata,
          (asyncFinishedTask: FinishedTask) => {
            this.notificationService.notifyTask(asyncFinishedTask);
          }
        );
        this.modalRef.hide();
        this.onSubmit.next(snapshotName);
      })
      .catch(() => {
        this.snapshotForm.setErrors({ cdSubmitButton: true });
      });
  }

  submit() {
    if (this.editing) {
      this.editAction();
    } else {
      this.createAction();
    }
  }
}