import { Injectable } from '@angular/core';
import { FileFormat } from '@app/core/model/file/file-format.model';
import { BaseService } from '@common/base/base.service';
import { catchError, takeUntil } from 'rxjs/operators';
import { FileTransformerHttpService } from './file-transformer.http.service';
import { Guid } from '@common/types/guid';
import * as FileSaver from 'file-saver';
import { MatomoService } from '../matomo/matomo-service';
import { FileUtils } from '../utilities/file-utils.service';

@Injectable()
export class FileTransformerService extends BaseService {

	constructor(
		private fileTransformerHttpService: FileTransformerHttpService,
		private matomoService: MatomoService,
		private fileUtils: FileUtils
	) { super(); }

	private _initialized: boolean = false;
	private _loading: boolean = false;

	private _availableFormats: FileFormat[] = [];
	get availableFormats(): FileFormat[] {
		// console.log('availableFormats');
		if (!this._initialized && !this._loading) this.init();
		return this._availableFormats;
	}

	init() {
		this._loading = true;
		// console.log('init');
		this.fileTransformerHttpService.getAvailableConfigurations().pipe(takeUntil(this._destroyed), catchError((error) => {
			this._loading = false;
			this._initialized = true;
			return [];
		})).subscribe(items => {
			this._availableFormats = items;
			this._loading = false;
			this._initialized = true;
		});
	}

	exportDmp(id: Guid, format: string) {
		this._loading = true;
		this.fileTransformerHttpService.exportDmp(id, format).pipe(takeUntil(this._destroyed), catchError((error) => {
			this._loading = false;
			return null;
		})).subscribe(result => {
			if (result !== null) {
				const blob = new Blob([result.body], { type: 'application/octet-stream' });
					const filename = this.fileUtils.getFilenameFromContentDispositionHeader(result.headers.get('Content-Disposition'));

					FileSaver.saveAs(blob, filename);
					this.matomoService.trackDownload('dmps', format, id.toString());
			}
		});
	}

	exportDescription(id: Guid, format: string) {
		this._loading = true;
		this.fileTransformerHttpService.exportDescription(id, format).pipe(takeUntil(this._destroyed), catchError((error) => {
			this._loading = false;
			return null;
		})).subscribe(result => {
			if (result !== null) {
				const blob = new Blob([result.body], { type: 'application/octet-stream' });
					const filename = this.fileUtils.getFilenameFromContentDispositionHeader(result.headers.get('Content-Disposition'));

					FileSaver.saveAs(blob, filename);
					this.matomoService.trackDownload('descriptions', format, id.toString());
			}
		});
	}
}