import 'reflect-metadata';
jest.mock('angular2-http-file-upload');

import {
    FileUploaderComponent,
} from './file-uploader.component';

const initFileUploaderComponent = () => {
    const fileUploaderComponent = new FileUploaderComponent();
    fileUploaderComponent.fileInput = {
        nativeElement: {
            click: () => { return; },
        },
    };
    return fileUploaderComponent;
};

describe('clickedUpload', () => {
    test('Calls nativeElement.click on fileInput reference', () => {
        const fileUploaderComponent = initFileUploaderComponent();
        jest.spyOn(fileUploaderComponent.fileInput.nativeElement, 'click');
        fileUploaderComponent.clickedUpload();
        expect(fileUploaderComponent.fileInput.nativeElement.click)
            .toBeCalled();
        expect(fileUploaderComponent.fileInput.nativeElement.click)
            .toHaveBeenCalledTimes(1);
    });
});

describe('uploadFiles', () => {
    test('Returns undefined if fileList.length is 0', () => {
        const fileUploaderComponent = initFileUploaderComponent();
        fileUploaderComponent.fileInput.nativeElement.files = [];
        expect(fileUploaderComponent.uploadFiles()).toEqual(undefined);
    });
    test('Calls onFilesSelected.emit with the fileList', () => {
        const fileUploaderComponent = initFileUploaderComponent();
        fileUploaderComponent.fileInput.nativeElement.files = [ 1, 2, 3 ];
        jest.spyOn(fileUploaderComponent.onFilesSelected, 'emit');

        fileUploaderComponent.uploadFiles();

        expect(fileUploaderComponent.onFilesSelected.emit)
        .toHaveBeenCalledWith(
            fileUploaderComponent.fileInput.nativeElement.files,
        );
    });
    // tslint:disable-next-line
    test('Sets fileInput.nativeElement.value to \'\' if fileList.length > 0', () => {
        const fileUploaderComponent = initFileUploaderComponent();
        fileUploaderComponent.fileInput.nativeElement.files = [ 1 ];
        fileUploaderComponent.uploadFiles();
        expect(fileUploaderComponent.fileInput.nativeElement.value)
            .toEqual('');
    });
});