/** 
 * Importing necessary components and interfaces.
 * */
import { Component, OnInit, Input } from '@angular/core';
import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
import { BackendService, ScrumSprint } from '../../../services/backend.service';

@Component({
	selector: 'app-task-form',
	templateUrl: './sprint-form.component.html',
	styleUrls: ['./sprint-form.component.css']
})

/** 
 * Class implements the logic for a popup window form to create and modify sprints.
*/
export class SprintFormComponent implements OnInit {
	@Input() public sprint: ScrumSprint;
	public editing: Boolean;
	public sprintId: string;

	constructor(private backendService: BackendService, private activeModalService: NgbActiveModal) { }

	/**
   * If no sprint exists a new one will be created.
   * In other cases the sprint exists and gets modifiable.
   */
	ngOnInit(): void {
		if (this.sprint === null || this.sprint === undefined) {
			this.sprint = { title: '', startDate: '', endDate: '' };
			this.editing = false;
		} else {
			this.editing = true;
		}
		document.getElementById('titleField').focus();
	}

	/**
   * A new created sprint will be saved in the backend (POST).
   * If a sprint already exists, modifiying results an update (PUT) to the backend.
   */
	onSubmit() {
		if (this.editing) {
			this.backendService.putSprint(this.sprint).subscribe((response) => {
				if (response.status > 399) {
					alert('Fehler');
				}
			});
		} else {
			this.backendService.postSprint(this.sprint).subscribe((response) => {
				console.log('Sprint gespeichert!');
				if (response.status > 399) {
					alert('Fehler');
				} else {
					// Copy properties returned by the API
					Object.assign(this.sprint, response.body);
				}
			});
		}
		// Closes the popup window after submitting/canceling.
		this.activeModalService.close(this.sprint);
	}

	/**
   * Closes the popup form window (by clicking "close button"):
   */
	onClose() {
		this.activeModalService.dismiss(this.sprint);
	}
}