import { Component, OnInit, OnDestroy } from '@angular/core';
import { LanguageService } from '@app/core/services/language/language.service';
import { BaseComponent } from '@common/base/base.component';
import { takeUntil } from 'rxjs/operators';
import { FormGroup, FormBuilder } from '@angular/forms';
import { TranslateService } from '@ngx-translate/core';
import { UiNotificationService, SnackBarNotificationLevel } from '@app/core/services/notification/ui-notification-service';
import { Router } from '@angular/router';

@Component({
  selector: 'app-language-editor',
  templateUrl: './language-editor.component.html',
  styleUrls: ['./language-editor.component.scss']
})
export class LanguageEditorComponent extends BaseComponent implements OnInit, OnDestroy {
	readonly rowHeight = 100;
	readonly maxElements = 12;

	allkeys = [];
	keys = [];
	visibleKeys = [];
	startIndex = 0;
	endIndex: number;
	parseFinished = false;
	currentLang: string;
	formGroup: FormGroup;
	formBuilder: FormBuilder;

  constructor(
	  private language: LanguageService,
	  private uiNotificationService: UiNotificationService,
	  private translate: TranslateService,
	  private router: Router,
  ) { super(); }

  ngOnInit() {
	  this.formBuilder = new FormBuilder();
	  this.formGroup = this.formBuilder.group({});
	  this.endIndex = this.maxElements;
	  window.addEventListener('scroll', this.refreshFn, true);
	  this.language.getCurrentLanguageJSON()
	  .pipe(takeUntil(this._destroyed))
	  .subscribe(response => {
		const blob = new Blob([response.body], { type: 'application/json' });
		this.convertBlobToJSON(blob);

	  });
  }

  ngOnDestroy() {
	window.removeEventListener('scroll', this.refreshFn, true);
  }

  convertBlobToJSON(blob: Blob) {
	const fr = new FileReader();
	fr.onload = ev => {
		const langObj = JSON.parse(fr.result as string);
		this.convertObjectToForm(langObj, '', this.formGroup);
		this.currentLang = this.language.getCurrentLanguageName();
		this.keys.length = 0;
		for (const key of this.allkeys) {
			this.keys.push(key);
		}
		this.visibleKeys = this.keys.slice(this.startIndex, this.endIndex);
		this.parseFinished = true;

	};
	fr.readAsText(blob);
  }

  convertObjectToForm(obj: any, parentKey: string, form: FormGroup) {
	  for (let prop in obj) {
		  const key = parentKey !== '' ? `${parentKey}.${prop}` : prop;
		  if (typeof obj[prop] === 'object') {
			  form.addControl(prop, this.formBuilder.group({}));
			  this.convertObjectToForm(obj[prop], key, form.get(prop) as FormGroup);
			  continue;
		  } else {
			  form.addControl(prop, this.formBuilder.control(obj[prop]));
			  this.allkeys.push(key);
		  }
	  }
	  return;
  }

  updateLang() {
	  const json = JSON.stringify(this.formGroup.value, null, "	");
	  this.language.updateLanguage(json).pipe(takeUntil(this._destroyed))
	  .subscribe(
		  complete => {
			   this.onCallbackSuccess(complete);
		  },
		  error => {
			  this.onCallbackError(error);
		  }
	  );

  }

  onCallbackSuccess(id?: String): void {
	this.uiNotificationService.snackBarNotification( this.translate.instant('GENERAL.SNACK-BAR.SUCCESSFUL-UPDATE'), SnackBarNotificationLevel.Success);
	this.router.navigate(['/reload']).then(() => this.router.navigate(['/language-editor']));
}

onCallbackError(error: any) {
	this.uiNotificationService.snackBarNotification( error, SnackBarNotificationLevel.Error);
	//this.validateAllFormFields(this.formGroup);
}

refreshFn = (ev: Event) => {

	if ((ev.srcElement as HTMLDocument).scrollingElement !== undefined) {
		this.startIndex = Math.floor((ev.srcElement as HTMLDocument).scrollingElement.scrollTop / this.rowHeight);
		this.endIndex = this.startIndex + this.maxElements;
		const tempKeys = this.keys.slice(this.startIndex, this.endIndex);
		this.visibleKeys.length = 0;
		for (const key of tempKeys) {
			this.visibleKeys.push(key);
		}
	}
}

findKeys(ev: any) {
	let tempKeys = [];
	if (ev.value === "") {
		tempKeys = this.allkeys;
	} else {
		tempKeys = this.allkeys.filter((key) => (this.formGroup.get(key).value as string).toLowerCase().includes(ev.value.toLowerCase()));
		window.scrollTo({top: 0});
	}
	this.keys.length = 0;
	for (const key of tempKeys) {
		this.keys.push(key);
	}
	this.visibleKeys = this.keys.slice(this.startIndex, this.endIndex);
}

}