import { Component, DebugElement } from '@angular/core';
import { By } from '@angular/platform-browser';
import { inject, ComponentFixture, TestBed } from '@angular/core/testing';

import { FileUploader } from '../file-upload/file-uploader.class';
import { FileUploadModule } from '../file-upload/file-upload.module';
import { FileDropDirective } from '../file-upload/file-drop.directive';
import { FileUploaderService } from '../file-upload/file-uploader.service';

@Component({
	selector: 'ngx-container',
	template: `<div type="file" ngxFileDrop [uploader]="uploader"></div>`,
})
export class ContainerComponent {
	public get url(): string { return 'localhost:3000'; }
	public uploader: FileUploader;
	constructor(uploaderService: FileUploaderService) {
		uploaderService.defaultLinks = {
			downloadEntry: this.url,
			updateEntry: this.url,
			createEntry: this.url,
			deleteEntry: 'this.url',
		};
		uploaderService.defaultOptions = {
			createMethod: 'POST',
			updateMethod: 'POST',
			authorizationHeaderName: 'Authorization',
			tokenPattern: null,
			token: null,
			chunkSize: 0,
			totalChunkParamName: 'total_chunks',
			currentChunkParamName: 'current_chunk',
			contentTypeParamName: 'content_type',
			fileParamName: 'file',
			idAttribute: 'id',
		};
		this.uploader = new FileUploader({
			uploaderService: uploaderService,
		});
	}
}

describe('Directive: FileDropDirective', () => {

	let fixture: ComponentFixture<ContainerComponent>;
	let hostComponent: ContainerComponent;
	let directiveElement: DebugElement;
	let fileDropDirective: FileDropDirective;

	beforeEach(() => {
		TestBed.configureTestingModule({
			imports: [FileUploadModule],
			declarations: [ContainerComponent],
			providers: [ContainerComponent]
		});
	});

	beforeEach(() => {
		fixture = TestBed.createComponent(ContainerComponent);
		hostComponent = fixture.componentInstance;

		fixture.detectChanges();

		directiveElement = fixture.debugElement.query(By.directive(FileDropDirective));
		fileDropDirective = directiveElement.injector.get(FileDropDirective) as FileDropDirective;
	});

	it('can be initialized', () => {
		expect(fixture).toBeDefined();
		expect(hostComponent).toBeDefined();
		expect(fileDropDirective).toBeDefined();
	});

	it('can set file uploader', () => {
		expect(fileDropDirective.uploader).toBe(hostComponent.uploader);
	});

	it('can get uploader options', () => {
		const options = fileDropDirective.getOptions();

		// Check url set through binding
		expect(options.url).toBe(hostComponent.url);

		// Check default options
		expect(options.autoUpload).toBeFalsy();
		expect(options.isHTML5).toBeTruthy();
		expect(options.removeAfterUpload).toBeFalsy();
		expect(options.disableMultipart).toBeFalsy();
	});

	it('can get filters', () => {
		const filters = fileDropDirective.getFilters();

		// TODO: Update test once implemented
		expect(filters).toEqual({});
	});

	it('handles drop event', () => {
		spyOn(fileDropDirective, 'onDrop');

		directiveElement.triggerEventHandler('drop', getFakeEventData());

		expect(fileDropDirective.onDrop).toHaveBeenCalled();
	});

	it('adds file to upload', () => {
		spyOn(fileDropDirective.uploader, 'addToQueue');

		let fileOverData: any;
		fileDropDirective.fileOver.subscribe((data: any) => fileOverData = data);

		let fileDropData: any;
		fileDropDirective.onFileDrop.subscribe((data: File[]) => fileDropData = data);

		fileDropDirective.onDrop(getFakeEventData());

		const uploadedFiles = getFakeEventData().dataTransfer.files;
		const expectedArguments = [uploadedFiles, fileDropDirective.getOptions(), fileDropDirective.getFilters()];

		expect(fileDropDirective.uploader.addToQueue).toHaveBeenCalledWith(...expectedArguments);
		expect(fileOverData).toBeFalsy();
		expect(fileDropData).toEqual(uploadedFiles);
	});

	it('handles dragover event', () => {
		spyOn(fileDropDirective, 'onDragOver');

		directiveElement.triggerEventHandler('dragover', getFakeEventData());

		expect(fileDropDirective.onDragOver).toHaveBeenCalled();
	});

	it('handles file over', () => {
		let fileOverData;
		fileDropDirective.fileOver.subscribe((data: any) => fileOverData = data);

		fileDropDirective.onDragOver(getFakeEventData());

		expect(fileOverData).toBeTruthy();
	});

	it('handles dragleave event', () => {
		spyOn(fileDropDirective, 'onDragLeave');

		directiveElement.triggerEventHandler('dragleave', getFakeEventData());

		expect(fileDropDirective.onDragLeave).toHaveBeenCalled();
	});

	it('handles file over leave', () => {
		let fileOverData;
		fileDropDirective.fileOver.subscribe((data: any) => fileOverData = data);

		fileDropDirective.onDragLeave(getFakeEventData());

		expect(fileOverData).toBeFalsy();
	});
});

function getFakeEventData(): any {
	return {
		dataTransfer: {
			files: ['foo.bar'],
			types: ['Files'],
		},
		preventDefault: (): any => undefined,
		stopPropagation: (): any => undefined,
	};
}