import { DataSource } from '@angular/cdk/table';
import { Component, OnInit, ViewChild } from '@angular/core';
import { MatPaginator, MatSnackBar, MatSort, PageEvent } from '@angular/material';
import { ActivatedRoute, Params, Router } from '@angular/router';
import { TranslateService } from '@ngx-translate/core';
import { Observable } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { BaseComponent } from '../../core/common/base/base.component';
import { DatasetListingModel } from '../../core/model/dataset/dataset-listing';
import { DatasetCriteria } from '../../core/query/dataset/dataset-criteria';
import { ExploreDatasetCriteriaModel } from '../../core/query/explore-dataset/explore-dataset-criteria';
import { DatasetService } from '../../core/services/dataset/dataset.service';
import { DmpService } from '../../core/services/dmp/dmp.service';
import { DataTableRequest } from '../../core/model/data-table/data-table-request';


@Component({
	selector: 'app-explore-dataset-listing-component',
	templateUrl: 'explore-dataset-listing.component.html',
	styleUrls: ['./explore-dataset-listing.component.scss'],
})
export class ExploreDatasetListingComponent extends BaseComponent implements OnInit {

	@ViewChild(MatPaginator) _paginator: MatPaginator;
	@ViewChild(MatSort) sort: MatSort;
	criteria: ExploreDatasetCriteriaModel = new ExploreDatasetCriteriaModel();

	dataSource: DatasetDataSource | null;
	displayedColumns: String[] = ['label', 'project', 'profile', 'description', 'created'];
	pageEvent: PageEvent;
	titlePrefix: String;
	dmpId: string;

	constructor(
		private datasetService: DatasetService,
		private router: Router,
		private languageService: TranslateService,
		public snackBar: MatSnackBar,
		public route: ActivatedRoute,
		public dmpService: DmpService
	) {
		super();
	}

	ngOnInit() {

		this.route.params
			.pipe(takeUntil(this._destroyed))
			.subscribe(async (params: Params) => {
				this.dmpId = params['dmpId'];
				this.refresh();
				if (this.dmpId != null) {
					const dmp = await this.dmpService.getSingle(this.dmpId).toPromise();
					if (params['dmpLabel'] !== undefined) {
						this.titlePrefix = 'for ' + params['dmpLabel'];
					}
				}
			});
	}

	onCriteriaChange(event: ExploreDatasetCriteriaModel) {
		console.log(event)
		this.criteria = event;
		this.refresh();
	}

	refresh() {
		this.dataSource = new DatasetDataSource(this.datasetService, this._paginator, this.sort, this.languageService, this.snackBar, this.criteria, this.dmpId);
	}

	rowClick(rowId: String) {
		this.router.navigate(['/datasets/publicEdit/' + rowId]);
	}

	getDefaultCriteria(dmpId: String): DatasetCriteria {
		const defaultCriteria = new DatasetCriteria();
		if (dmpId != null) {
			defaultCriteria.dmpIds.push(dmpId);
		}
		return defaultCriteria;
	}

	makeItPublic(id: String) {
		this.datasetService.makeDatasetPublic(id)
			.pipe(takeUntil(this._destroyed))
			.subscribe();
	}
}

export class DatasetDataSource extends DataSource<DatasetListingModel> {

	totalCount = 0;

	constructor(
		private _service: DatasetService,
		private _paginator: MatPaginator,
		private _sort: MatSort,
		private _languageService: TranslateService,
		private _snackBar: MatSnackBar,
		private _criteria: ExploreDatasetCriteriaModel,
		private dmpId: String
	) {
		super();

	}

	connect(): Observable<DatasetListingModel[]> {
		const displayDataChanges = [
			this._paginator.page
			//this._sort.matSortChange
		];


		return Observable.merge(...displayDataChanges)
			.startWith(null)
			.switchMap(() => {
				const startIndex = this._paginator.pageIndex * this._paginator.pageSize;
				let fields: Array<string> = new Array();
				if (this._sort.active) { fields = this._sort.direction === 'asc' ? ['+' + this._sort.active] : ['-' + this._sort.active]; }
				const request = new DataTableRequest<ExploreDatasetCriteriaModel>(startIndex, this._paginator.pageSize, { fields: fields });
				request.criteria = this._criteria;
				//if (this.dmpId) request.criteria.allVersions = true;
				return this._service.getPublicPaged(request);
			})
			/*.catch((error: any) => {
			  this._snackBar.openFromComponent(SnackBarNotificationComponent, {
				data: { message: 'GENERAL.SNACK-BAR.FORMS-BAD-REQUEST', language: this._languageService },
				duration: 3000,
				extraClasses: ['snackbar-warning']
			  });
			  //this._criteria.criteria.onCallbackError(error);
			  return Observable.of(null);
			})
			.map(result => {
				return result;
			})*/
			.map(result => {
				if (!result) { return []; }
				if (this._paginator.pageIndex === 0) { this.totalCount = result.totalCount; }
				return result.data;
			});
	}

	disconnect() {
		// No-op
	}
}