import { describe, it, expect, vi, afterEach } from 'vitest';
import { cleanup, render } from 'vitest-browser-svelte';
import { page } from 'vitest/browser';
import UploadZone from './UploadZone.svelte';

afterEach(cleanup);

describe('UploadZone', () => {
	describe('idle state', () => {
		it('shows the filename in the upload zone', async () => {
			render(UploadZone, {
				props: { filename: 'brief_1920.pdf', isUploading: false, isDragging: false, error: null }
			});
			await expect.element(page.getByText('brief_1920.pdf')).toBeVisible();
		});

		it('shows "Datei auswählen" button', async () => {
			render(UploadZone, {
				props: { filename: 'scan.pdf', isUploading: false, isDragging: false, error: null }
			});
			await expect.element(page.getByText('Datei auswählen')).toBeVisible();
		});

		it('does not show the uploading animation', async () => {
			render(UploadZone, {
				props: { filename: 'scan.pdf', isUploading: false, isDragging: false, error: null }
			});
			expect(document.querySelector('[role="status"]')).toBeNull();
		});
	});

	describe('uploading state', () => {
		it('shows the uploading progress region', async () => {
			render(UploadZone, {
				props: { filename: 'scan.pdf', isUploading: true, isDragging: false, error: null }
			});
			await expect.element(page.getByRole('status')).toBeVisible();
		});

		it('shows Abbrechen button during upload', async () => {
			render(UploadZone, {
				props: { filename: 'scan.pdf', isUploading: true, isDragging: false, error: null }
			});
			await expect.element(page.getByText('Abbrechen')).toBeVisible();
		});

		it('calls onCancel when Abbrechen is clicked', async () => {
			const onCancel = vi.fn();
			render(UploadZone, {
				props: { filename: 'scan.pdf', isUploading: true, isDragging: false, error: null, onCancel }
			});
			// Click the button inside [role="status"] — more specific than querySelector('button')
			const btn = document.querySelector('[role="status"] button') as HTMLButtonElement;
			btn.dispatchEvent(new MouseEvent('click', { bubbles: true }));
			expect(onCancel).toHaveBeenCalledOnce();
		});
	});

	describe('error state', () => {
		it('shows the error message', async () => {
			render(UploadZone, {
				props: {
					filename: 'scan.pdf',
					isUploading: false,
					isDragging: false,
					error: 'Dateityp nicht unterstützt'
				}
			});
			await expect.element(page.getByText('Dateityp nicht unterstützt')).toBeVisible();
		});
	});

	describe('file selection', () => {
		it('calls onFile for a valid PDF', () => {
			const onFile = vi.fn();
			render(UploadZone, {
				props: { filename: 'scan.pdf', isUploading: false, isDragging: false, error: null, onFile }
			});
			const input = document.querySelector('input[type="file"]') as HTMLInputElement;
			const pdf = new File(['%PDF-1.4'], 'brief.pdf', { type: 'application/pdf' });
			Object.defineProperty(input, 'files', { value: [pdf], writable: false });
			input.dispatchEvent(new Event('change', { bubbles: true }));
			expect(onFile).toHaveBeenCalledWith(pdf);
		});

		it('does not call onFile for an unsupported MIME type', async () => {
			const onFile = vi.fn();
			render(UploadZone, {
				props: { filename: 'scan.pdf', isUploading: false, isDragging: false, error: null, onFile }
			});
			const input = document.querySelector('input[type="file"]') as HTMLInputElement;
			const docxFile = new File(['x'], 'test.docx', {
				type: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
			});
			Object.defineProperty(input, 'files', { value: [docxFile], writable: false });
			input.dispatchEvent(new Event('change', { bubbles: true }));
			expect(onFile).not.toHaveBeenCalled();
			await expect
				.element(page.getByText('Dieser Dateityp wird nicht unterstützt (PDF, JPG, PNG, TIFF).'))
				.toBeVisible();
		});

		it('does not call onFile when file exceeds 50 MB', async () => {
			const onFile = vi.fn();
			render(UploadZone, {
				props: { filename: 'scan.pdf', isUploading: false, isDragging: false, error: null, onFile }
			});
			const input = document.querySelector('input[type="file"]') as HTMLInputElement;
			const bigFile = new File(['x'.repeat(1)], 'huge.pdf', { type: 'application/pdf' });
			Object.defineProperty(bigFile, 'size', { value: 51 * 1024 * 1024 });
			Object.defineProperty(input, 'files', { value: [bigFile], writable: false });
			input.dispatchEvent(new Event('change', { bubbles: true }));
			expect(onFile).not.toHaveBeenCalled();
			await expect.element(page.getByText('Die Datei ist zu groß (max. 50 MB).')).toBeVisible();
		});
	});
});