import { expect, test, type Download, type Locator, type Page } from '@playwright/test';
import {
	decodePDFRawStream,
	degrees,
	PDFArray,
	PDFDocument,
	PDFRawStream,
	StandardFonts,
	rgb
} from 'pdf-lib';
import { PDFDocument as EncryptablePdfDocument } from '@cantoo/pdf-lib';
import { unzipSync, zipSync } from 'fflate';
import { readFile } from 'node:fs/promises';

const createPdf = async (pageCount: number, label: string) => {
	const document = await PDFDocument.create();
	const font = await document.embedFont(StandardFonts.Helvetica);
	for (let pageNumber = 1; pageNumber <= pageCount; pageNumber += 1) {
		const page = document.addPage([420, 594]);
		page.drawText(`${label} – Seite ${pageNumber}`, {
			x: 40,
			y: 520,
			size: 20,
			font,
			color: rgb(0.1, 0.2, 0.4)
		});
	}
	return Buffer.from(await document.save());
};

const createStampPng = (page: Page) =>
	page.evaluate(
		async () =>
			new Promise<string>((resolve, reject) => {
				const canvas = document.createElement('canvas');
				canvas.width = 32;
				canvas.height = 32;
				const context = canvas.getContext('2d');
				if (!context) {
					reject(new Error('Kein 2D-Kontext'));
					return;
				}
				context.fillStyle = '#cc1a1a';
				context.fillRect(0, 0, 32, 32);
				canvas.toBlob(async (blob) => {
					if (!blob) {
						reject(new Error('PNG konnte nicht erzeugt werden'));
						return;
					}
					const bytes = new Uint8Array(await blob.arrayBuffer());
					let binary = '';
					bytes.forEach((byte) => {
						binary += String.fromCharCode(byte);
					});
					resolve(btoa(binary));
				}, 'image/png');
			})
	);

const dropFiles = async (
	page: Page,
	target: Locator | 'window',
	files: Array<{ name: string; mimeType: string; buffer: Buffer }>
) => {
	await page.locator('[data-dropzone-ready="true"]').first().waitFor();
	const dataTransfer = await page.evaluateHandle(
		(droppedFiles) => {
			const transfer = new DataTransfer();
			for (const droppedFile of droppedFiles) {
				const bytes = Uint8Array.from(atob(droppedFile.base64), (character) =>
					character.charCodeAt(0)
				);
				transfer.items.add(
					new File([bytes], droppedFile.name, {
						type: droppedFile.mimeType,
						lastModified: Date.now()
					})
				);
			}
			return transfer;
		},
		files.map((file) => ({
			name: file.name,
			mimeType: file.mimeType,
			base64: file.buffer.toString('base64')
		}))
	);

	if (target === 'window') {
		await page.evaluate((transfer) => {
			window.dispatchEvent(
				new DragEvent('drop', { dataTransfer: transfer, bubbles: true, cancelable: true })
			);
		}, dataTransfer);
	} else {
		await target.dispatchEvent('drop', { dataTransfer });
	}
	await dataTransfer.dispose();
};

const expectPdfDownload = async (download: Download, name: RegExp) => {
	expect(download.suggestedFilename()).toMatch(name);
	const path = await download.path();
	expect(path).not.toBeNull();
	const bytes = await readFile(path!);
	expect(bytes.subarray(0, 5).toString()).toBe('%PDF-');
	return bytes;
};

const getPageContentStreamCount = (document: PDFDocument, pageIndex: number) => {
	const contents = document.getPage(pageIndex).node.Contents();
	if (!contents) return 0;
	return contents instanceof PDFArray ? contents.size() : 1;
};

const getPageContentText = (document: PDFDocument, pageIndex: number) => {
	const contents = document.getPage(pageIndex).node.Contents();
	const refs = contents instanceof PDFArray ? contents.asArray() : contents ? [contents] : [];
	return refs
		.map((ref) => document.context.lookup(ref))
		.filter((stream): stream is PDFRawStream => stream instanceof PDFRawStream)
		.map((stream) => Buffer.from(decodePDFRawStream(stream).decode()).toString('latin1'))
		.join('\n');
};

const createEncryptedPdf = async (pageCount: number, label: string, password: string) => {
	const document = await EncryptablePdfDocument.load(await createPdf(pageCount, label));
	document.encrypt({
		userPassword: password,
		ownerPassword: 'owner-passwort',
		permissions: { printing: true, copying: true }
	});
	return Buffer.from(await document.save());
};

const createPreRotatedPdf = async (pageCount: number, label: string) => {
	const document = await PDFDocument.create();
	const font = await document.embedFont(StandardFonts.Helvetica);
	for (let pageNumber = 1; pageNumber <= pageCount; pageNumber += 1) {
		const page = document.addPage([420, 594]);
		page.drawText(`${label} – Seite ${pageNumber}`, {
			x: 40,
			y: 520,
			size: 20,
			font,
			color: rgb(0.1, 0.2, 0.4)
		});
		if (pageNumber === 1) page.setRotation(degrees(90));
	}
	return Buffer.from(await document.save());
};

const trackPageErrors = (page: Page) => {
	const errors: Error[] = [];
	page.on('pageerror', (error) => errors.push(error));
	return errors;
};

const pdfDropzone = (page: Page) => page.getByRole('button', { name: 'PDF-Dateien hinzufügen' });
const zipDropzone = (page: Page) =>
	page.getByRole('button', { name: 'beA-ZIP-Dateien hinzufügen' });

const createZip = async (label: string, pageCount = 1) =>
	Buffer.from(zipSync({ [`${label}.pdf`]: await createPdf(pageCount, label) }));

const newZipButton = (page: Page) => page.getByRole('button', { name: 'Neue ZIP bearbeiten' });
const settingsButton = (page: Page) =>
	page.getByRole('button', { name: 'Einstellungen', exact: true });
const replaceZipInput = (page: Page) => page.locator('input[data-zip-picker="replace-zip"]');
const appendZipInput = (page: Page) => page.locator('input[data-zip-picker="append-zip"]');
const workspaceStatus = (page: Page, pattern: RegExp) => page.getByText(pattern);

const waitForLoadedWorkspace = async (
	page: Page,
	status: RegExp,
	options?: { timeout?: number }
) => {
	await expect(newZipButton(page)).toBeVisible();
	await expect(workspaceStatus(page, status)).toBeVisible({ timeout: options?.timeout ?? 15_000 });
};

const replaceThroughDialog = async (page: Page, zip: Buffer, confirm: boolean) => {
	await newZipButton(page).click();
	await replaceZipInput(page).setInputFiles([
		{ name: 'archiv-b.zip', mimeType: 'application/zip', buffer: zip }
	]);
	await expect(page.getByText('Aktuelle Bearbeitung ersetzen?')).toBeVisible();
	if (confirm) {
		await page.getByRole('button', { name: 'Neue ZIP öffnen' }).click();
	} else {
		await page.getByRole('button', { name: 'Abbrechen' }).click();
	}
	await expect(page.getByText('Aktuelle Bearbeitung ersetzen?')).toBeHidden();
};

test('start page exposes only working tools and forwards a dropped ZIP to beA', async ({
	page
}) => {
	const pageErrors = trackPageErrors(page);
	const pdf = await createPdf(1, 'beA');
	const zip = Buffer.from(zipSync({ 'anlage.pdf': pdf }));

	await page.goto('/');
	await expect(page.getByRole('heading', { name: 'Werkzeugkasten für beA' })).toBeVisible();
	await expect(page.getByRole('link', { name: /Stempeln/ })).toBeVisible();
	await expect(page.getByRole('link', { name: /Signieren/ })).toHaveCount(0);

	await dropFiles(page, 'window', [
		{ name: 'bea-archiv.zip', mimeType: 'application/zip', buffer: zip }
	]);

	await expect(page).toHaveURL(/\/tools\/bea$/);
	await expect(page.getByText('1 lose Datei')).toBeVisible({ timeout: 15_000 });
	expect(pageErrors).toEqual([]);
});

test('beA reports an invalid ZIP and lets the user remove it', async ({ page }) => {
	const pageErrors = trackPageErrors(page);

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{
			name: 'defektes-archiv.zip',
			mimeType: 'application/zip',
			buffer: Buffer.from('kein gueltiges ZIP-Archiv')
		}
	]);

	await expect(page.getByText('defektes-archiv.zip', { exact: true })).toBeVisible();
	await expect(page.getByText('Konnte nicht geöffnet werden.')).toBeVisible();
	await expect(page.getByRole('status')).toContainText('1 fehlgeschlagen');
	await expect(page.getByRole('button', { name: 'Erneut versuchen' })).toBeVisible();

	await page.getByRole('button', { name: 'Entfernen' }).click();
	await expect(zipDropzone(page)).toBeVisible();
	expect(pageErrors).toEqual([]);
});

test('short tool pages keep the footer flush with the viewport bottom', async ({ page }) => {
	const expectFooterAtViewportBottom = async (viewport: { width: number; height: number }) => {
		await page.setViewportSize(viewport);
		await page.goto('/tools/watermark');

		const footerBottom = await page.locator('footer').evaluate((footer) => {
			return footer.getBoundingClientRect().bottom;
		});

		expect(Math.abs(footerBottom - viewport.height)).toBeLessThanOrEqual(1);
	};

	await expectFooterAtViewportBottom({ width: 1440, height: 900 });
	await expectFooterAtViewportBottom({ width: 390, height: 844 });
});

test('merge accepts dropped PDFs and downloads a merged PDF', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/merge');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'eins.pdf', mimeType: 'application/pdf', buffer: await createPdf(1, 'Eins') },
		{ name: 'zwei.pdf', mimeType: 'application/pdf', buffer: await createPdf(2, 'Zwei') }
	]);

	await expect(page.getByText('2 Dateien ausgewählt')).toBeVisible();
	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'PDFs zusammenfügen' }).click();
	await expectPdfDownload(await downloadPromise, /^zusammengefuegt\.pdf$/);
	expect(pageErrors).toEqual([]);
});

test('separate renders dropped PDF pages and removes a selected page', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/separate');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'seiten.pdf', mimeType: 'application/pdf', buffer: await createPdf(3, 'Trennen') }
	]);

	await expect(page.getByRole('button', { name: /Seite 1/ })).toBeVisible({ timeout: 15_000 });
	await page.getByRole('button', { name: /Seite 2/ }).click();
	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Seiten entfernen & herunterladen' }).click();
	await expectPdfDownload(await downloadPromise, /^seiten_ohne_seiten\.pdf$/);
	expect(pageErrors).toEqual([]);
});

test('rotate turns pages losslessly via /Rotate and reset clears deltas', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/rotate');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'drehung.pdf', mimeType: 'application/pdf', buffer: await createPdf(3, 'Drehen') }
	]);

	const downloadButton = page.getByRole('button', { name: 'Drehen & herunterladen' });
	await expect(page.getByRole('button', { name: 'Seite 2 um 90° nach rechts drehen' })).toBeVisible(
		{
			timeout: 15_000
		}
	);
	await expect(downloadButton).toBeDisabled();

	const rotateRightPage2 = page.getByRole('button', { name: 'Seite 2 um 90° nach rechts drehen' });
	await rotateRightPage2.click();
	await rotateRightPage2.click();
	await expect(page.getByText('1 von 3 Seiten gedreht')).toBeVisible();
	await expect(page.getByText('180°', { exact: true })).toBeVisible();

	const downloadPromise = page.waitForEvent('download');
	await downloadButton.click();
	const bytes = await expectPdfDownload(await downloadPromise, /^drehung_gedreht\.pdf$/);
	const output = await PDFDocument.load(bytes);
	expect(output.getPage(1).getRotation().angle).toBe(180);
	expect(output.getPage(0).getRotation().angle).toBe(0);

	await page.getByRole('button', { name: 'Zurücksetzen' }).click();
	await expect(page.getByText('0 von 3 Seiten gedreht')).toBeVisible();
	await expect(downloadButton).toBeDisabled();
	expect(pageErrors).toEqual([]);
});

test('rotate adds the delta on top of an existing /Rotate value', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/rotate');
	await dropFiles(page, pdfDropzone(page), [
		{
			name: 'vorgedreht.pdf',
			mimeType: 'application/pdf',
			buffer: await createPreRotatedPdf(2, 'Vorgedreht')
		}
	]);

	await expect(page.getByRole('button', { name: 'Seite 1 um 90° nach rechts drehen' })).toBeVisible(
		{
			timeout: 15_000
		}
	);
	await page.getByRole('button', { name: 'Seite 1 um 90° nach rechts drehen' }).click();
	await expect(page.getByText('1 von 2 Seiten gedreht')).toBeVisible();

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Drehen & herunterladen' }).click();
	const bytes = await expectPdfDownload(await downloadPromise, /^vorgedreht_gedreht\.pdf$/);
	const output = await PDFDocument.load(bytes);
	expect(output.getPage(0).getRotation().angle).toBe(180);
	expect(output.getPage(1).getRotation().angle).toBe(0);
	expect(pageErrors).toEqual([]);
});

test('watermark accepts numeric controls and downloads text and image watermarks', async ({
	page
}) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/watermark');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'marke.pdf', mimeType: 'application/pdf', buffer: await createPdf(1, 'Marke') }
	]);

	await expect(page.getByRole('heading', { name: 'Wasserzeichen-Einstellungen' })).toBeVisible();
	await page.locator('#watermark-color').fill('#00ff00');
	await page.locator('#watermark-opacity').fill('0.45');
	await page.getByRole('button', { name: 'Wasserzeichen anwenden', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toBeVisible({ timeout: 15_000 });
	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'marke.pdf herunterladen' }).click();
	await expectPdfDownload(await downloadPromise, /^marke_wasserzeichen\.pdf$/);

	await page.getByLabel('Bild', { exact: true }).check();
	await dropFiles(page, page.getByRole('button', { name: 'Wasserzeichenbild hinzufügen' }), [
		{
			name: 'logo.png',
			mimeType: 'image/png',
			buffer: Buffer.from(
				'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAusB9Y9Z5rAAAAAASUVORK5CYII=',
				'base64'
			)
		}
	]);
	// The file is already done, so reset it to pending by removing and re-adding it.
	await page.getByRole('button', { name: 'marke.pdf entfernen' }).click();
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'marke.pdf', mimeType: 'application/pdf', buffer: await createPdf(1, 'Marke') }
	]);
	await page.getByRole('button', { name: 'Wasserzeichen anwenden', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toBeVisible({ timeout: 15_000 });
	const imageDownloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'marke.pdf herunterladen' }).click();
	await expectPdfDownload(await imageDownloadPromise, /^marke_wasserzeichen\.pdf$/);

	expect(pageErrors).toEqual([]);
});

test('stamp presets fill the editable text and EILT is applied to every page', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/stamp');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'akte.pdf', mimeType: 'application/pdf', buffer: await createPdf(3, 'Akte') }
	]);

	const stampInput = page.locator('#stamp-text');
	for (const preset of ['BEGLAUBIGT', 'AUSFERTIGUNG', 'KOPIE', 'EILT', 'ENTWURF', 'ERLEDIGT']) {
		await page.getByRole('button', { name: preset, exact: true }).click();
		await expect(stampInput).toHaveValue(preset);
	}
	await page.getByRole('button', { name: 'EILT', exact: true }).click();
	await page.locator('#stamp-rotation').fill('20');
	await expect(page.getByTestId('stamp-preview')).toContainText('EILT');
	await expect(page.getByTestId('stamp-preview')).not.toHaveCSS('transform', 'none');

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Stempel anwenden & herunterladen' }).click();
	const outputBytes = await expectPdfDownload(await downloadPromise, /^akte_stempel\.pdf$/);
	const output = await PDFDocument.load(outputBytes);
	expect(output.getPageCount()).toBe(3);
	for (let pageIndex = 0; pageIndex < output.getPageCount(); pageIndex += 1) {
		expect(getPageContentStreamCount(output, pageIndex)).toBeGreaterThan(1);
	}
	expect(pageErrors).toEqual([]);
});

test('stamp custom text adds a German date and only changes selected pages', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	const inputBytes = await createPdf(3, 'Auswahl');
	const input = await PDFDocument.load(inputBytes);
	const originalStreamCounts = input
		.getPages()
		.map((_, pageIndex) => getPageContentStreamCount(input, pageIndex));

	await page.goto('/tools/stamp');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'auswahl.pdf', mimeType: 'application/pdf', buffer: inputBytes }
	]);
	await page.locator('#stamp-text').fill('nur hier');
	await page.getByRole('checkbox', { name: 'Datum anhängen' }).check();
	await expect(page.getByTestId('stamp-preview')).toHaveText(/NUR HIER \d{2}\.\d{2}\.\d{4}/);
	await page.getByRole('checkbox', { name: 'Auf alle Seiten anwenden' }).uncheck();
	await page.getByRole('button', { name: /Seite 2/ }).click();

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Stempel anwenden & herunterladen' }).click();
	const outputBytes = await expectPdfDownload(await downloadPromise, /^auswahl_stempel\.pdf$/);
	const output = await PDFDocument.load(outputBytes);
	expect(output.getPageCount()).toBe(3);
	expect(getPageContentStreamCount(output, 0)).toBe(originalStreamCounts[0]);
	expect(getPageContentStreamCount(output, 1)).toBeGreaterThan(originalStreamCounts[1]);
	expect(getPageContentStreamCount(output, 2)).toBe(originalStreamCounts[2]);
	expect(pageErrors).toEqual([]);
});

test('stamp uses an image instead of text and makes the border optional', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/stamp');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'bildakte.pdf', mimeType: 'application/pdf', buffer: await createPdf(2, 'Bild') }
	]);
	await page.locator('#stamp-image').setInputFiles({
		name: 'stempel.png',
		mimeType: 'image/png',
		buffer: Buffer.from(await createStampPng(page), 'base64')
	});

	await expect(page.getByText('stempel.png')).toBeVisible();
	await expect(page.getByTestId('stamp-preview').locator('img')).toBeVisible();
	await expect(page.locator('#stamp-text')).toHaveCount(0);
	await expect(page.getByRole('checkbox', { name: 'Rahmen um das Bild anzeigen' })).toBeVisible();
	await expect(
		page.getByRole('checkbox', { name: 'Rahmen um das Bild anzeigen' })
	).not.toBeChecked();

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Stempel anwenden & herunterladen' }).click();
	const outputBytes = await expectPdfDownload(await downloadPromise, /^bildakte_stempel\.pdf$/);
	const output = await PDFDocument.load(outputBytes);
	expect(output.getPageCount()).toBe(2);
	// Image without frame: the image XObject is drawn, no stroked rectangle is present.
	for (const pageIndex of [0, 1]) {
		const content = getPageContentText(output, pageIndex);
		expect(content).toContain(' Do\n');
		expect(content).not.toContain(' RG');
	}

	await page.getByRole('checkbox', { name: 'Rahmen um das Bild anzeigen' }).check();
	await expect(page.getByTestId('stamp-preview')).toHaveCSS('border-style', 'solid');
	const borderedDownloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Stempel anwenden & herunterladen' }).click();
	const borderedBytes = await expectPdfDownload(
		await borderedDownloadPromise,
		/^bildakte_stempel\.pdf$/
	);
	const bordered = await PDFDocument.load(borderedBytes);
	// The optional frame adds a stroked rectangle around the drawn image.
	for (const pageIndex of [0, 1]) {
		const content = getPageContentText(bordered, pageIndex);
		expect(content).toContain(' Do\n');
		expect(content).toContain(' RG');
		expect(content).toMatch(/\bh\nS\n/);
	}
	expect(pageErrors).toEqual([]);
});

test('stamp explains how to handle a password-protected PDF', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/stamp');
	await dropFiles(page, pdfDropzone(page), [
		{
			name: 'geschuetzt.pdf',
			mimeType: 'application/pdf',
			buffer: await createEncryptedPdf(1, 'Geschützt', 'test-passwort')
		}
	]);

	await expect(page.getByRole('alert')).toContainText('passwortgeschützt');
	await expect(page.getByRole('alert')).toContainText('Passwort entfernen');
	expect(pageErrors).toEqual([]);
});

test('watermark batch applies to every file and bundles results in one ZIP', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/watermark');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'eins.pdf', mimeType: 'application/pdf', buffer: await createPdf(1, 'Eins') },
		{ name: 'zwei.pdf', mimeType: 'application/pdf', buffer: await createPdf(2, 'Zwei') },
		{
			name: 'kaputt.pdf',
			mimeType: 'application/pdf',
			buffer: Buffer.from('kein gueltiges PDF')
		}
	]);

	await expect(page.getByText('Dateien (3)')).toBeVisible();
	await page.getByRole('button', { name: 'Wasserzeichen anwenden', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toHaveCount(2, { timeout: 15_000 });
	await expect(page.getByText('Fehler')).toBeVisible();
	// With several files the per-file page selection is replaced by all pages.
	await expect(page.getByRole('checkbox', { name: 'Auf alle Seiten anwenden' })).toHaveCount(0);

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Alle herunterladen' }).click();
	const download = await downloadPromise;
	expect(download.suggestedFilename()).toMatch(/^wasserzeichen_\d{4}-\d{2}-\d{2}\.zip$/);
	const zipPath = await download.path();
	expect(zipPath).not.toBeNull();
	const entries = Object.keys(unzipSync(new Uint8Array(await readFile(zipPath!))));
	expect(entries.sort()).toEqual(['eins_wasserzeichen.pdf', 'zwei_wasserzeichen.pdf']);
	expect(pageErrors).toEqual([]);
});

test('encrypt protects a dropped PDF and decrypt rebuilds it with the password', async ({
	page
}) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/encrypt');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'geheim.pdf', mimeType: 'application/pdf', buffer: await createPdf(1, 'Geheim') }
	]);

	await page.locator('#encrypt-password').fill('test-passwort');
	await page.locator('#encrypt-password-confirmation').fill('test-passwort');
	await page.getByRole('button', { name: 'Passwort setzen', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toBeVisible({ timeout: 15_000 });
	const encryptedDownloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'geheim.pdf herunterladen' }).click();
	const encryptedBytes = await expectPdfDownload(
		await encryptedDownloadPromise,
		/^geheim_geschuetzt\.pdf$/
	);

	await page.goto('/tools/decrypt');
	await dropFiles(page, pdfDropzone(page), [
		{
			name: 'geheim_geschuetzt.pdf',
			mimeType: 'application/pdf',
			buffer: encryptedBytes
		}
	]);
	await page.locator('#decrypt-password').fill('test-passwort');
	await page.getByRole('button', { name: 'Passwort entfernen', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toBeVisible({ timeout: 20_000 });
	const decryptedDownloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'geheim_geschuetzt.pdf herunterladen' }).click();
	await expectPdfDownload(await decryptedDownloadPromise, /^geheim_geschuetzt_entsperrt\.pdf$/);
	expect(pageErrors).toEqual([]);
});

test('encrypt batch protects every file and bundles results in one ZIP', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/encrypt');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'eins.pdf', mimeType: 'application/pdf', buffer: await createPdf(1, 'Eins') },
		{ name: 'zwei.pdf', mimeType: 'application/pdf', buffer: await createPdf(2, 'Zwei') }
	]);

	await expect(page.getByText('Dateien (2)')).toBeVisible();
	await page.locator('#encrypt-password').fill('test-passwort');
	await page.locator('#encrypt-password-confirmation').fill('test-passwort');
	await page.getByRole('button', { name: 'Passwort setzen', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toHaveCount(2, { timeout: 15_000 });

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Alle herunterladen' }).click();
	const download = await downloadPromise;
	expect(download.suggestedFilename()).toMatch(/^geschuetzt_\d{4}-\d{2}-\d{2}\.zip$/);
	const zipPath = await download.path();
	expect(zipPath).not.toBeNull();
	const entries = Object.keys(unzipSync(new Uint8Array(await readFile(zipPath!))));
	expect(entries.sort()).toEqual(['eins_geschuetzt.pdf', 'zwei_geschuetzt.pdf']);
	expect(pageErrors).toEqual([]);
});

test('decrypt batch unlocks every file and bundles results in one ZIP', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/decrypt');
	await dropFiles(page, pdfDropzone(page), [
		{
			name: 'eins_geschuetzt.pdf',
			mimeType: 'application/pdf',
			buffer: await createEncryptedPdf(1, 'Eins', 'test-passwort')
		},
		{
			name: 'zwei_geschuetzt.pdf',
			mimeType: 'application/pdf',
			buffer: await createEncryptedPdf(2, 'Zwei', 'test-passwort')
		},
		{
			name: 'kaputt.pdf',
			mimeType: 'application/pdf',
			buffer: Buffer.from('kein gueltiges PDF')
		}
	]);

	await expect(page.getByText('Dateien (3)')).toBeVisible();
	await page.locator('#decrypt-password').fill('test-passwort');
	await page.getByRole('button', { name: 'Passwort entfernen', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toHaveCount(2, { timeout: 20_000 });
	await expect(page.getByText(/Fehler beim Entsperren/)).toBeVisible();

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Alle herunterladen' }).click();
	const download = await downloadPromise;
	expect(download.suggestedFilename()).toMatch(/^entsperrt_\d{4}-\d{2}-\d{2}\.zip$/);
	const zipPath = await download.path();
	expect(zipPath).not.toBeNull();
	const entries = Object.keys(unzipSync(new Uint8Array(await readFile(zipPath!))));
	expect(entries.sort()).toEqual([
		'eins_geschuetzt_entsperrt.pdf',
		'zwei_geschuetzt_entsperrt.pdf'
	]);
	expect(pageErrors).toEqual([]);
});

test('compress processes a single dropped file and offers its download per row', async ({
	page
}) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/compress');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'gross.pdf', mimeType: 'application/pdf', buffer: await createPdf(2, 'Komprimieren') }
	]);

	await expect(page.getByText('Dateien (1)')).toBeVisible();
	await page.getByRole('button', { name: 'Komprimieren', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toBeVisible({ timeout: 20_000 });
	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'gross.pdf herunterladen' }).click();
	await expectPdfDownload(await downloadPromise, /^gross_komprimiert\.pdf$/);
	expect(pageErrors).toEqual([]);
});

test('compress appends further files and bundles all results in one ZIP', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/compress');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'eins.pdf', mimeType: 'application/pdf', buffer: await createPdf(1, 'Eins') }
	]);
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'zwei.pdf', mimeType: 'application/pdf', buffer: await createPdf(2, 'Zwei') }
	]);

	await expect(page.getByText('Dateien (2)')).toBeVisible();
	await page.getByRole('button', { name: 'Komprimieren', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toHaveCount(2, { timeout: 30_000 });

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Alle herunterladen' }).click();
	const download = await downloadPromise;
	expect(download.suggestedFilename()).toMatch(/^komprimiert_\d{4}-\d{2}-\d{2}\.zip$/);
	const zipPath = await download.path();
	expect(zipPath).not.toBeNull();
	const entries = Object.keys(unzipSync(new Uint8Array(await readFile(zipPath!))));
	expect(entries.sort()).toEqual(['eins_komprimiert.pdf', 'zwei_komprimiert.pdf']);
	expect(pageErrors).toEqual([]);
});

test('compress batch keeps processing after a failing file and supports retry and removal', async ({
	page
}) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/compress');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'gut.pdf', mimeType: 'application/pdf', buffer: await createPdf(1, 'Gut') },
		{
			name: 'kaputt.pdf',
			mimeType: 'application/pdf',
			buffer: Buffer.from('kein gueltiges PDF')
		}
	]);

	await page.getByRole('button', { name: 'Komprimieren', exact: true }).click();
	await expect(page.getByText('Fertig ✓')).toHaveCount(1, { timeout: 30_000 });
	await expect(page.getByText('Fehler')).toBeVisible();

	// Only one result exists, so the bulk ZIP action stays hidden.
	await expect(page.getByRole('button', { name: 'Alle herunterladen' })).toHaveCount(0);

	// Retrying the broken file fails again without disturbing the finished row.
	await page.getByRole('button', { name: 'kaputt.pdf erneut versuchen' }).click();
	await expect(page.getByText('Fertig ✓')).toHaveCount(1);
	await expect(page.getByText('Fehler')).toBeVisible();

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'gut.pdf herunterladen' }).click();
	await expectPdfDownload(await downloadPromise, /^gut_komprimiert\.pdf$/);

	await page.getByRole('button', { name: 'kaputt.pdf entfernen' }).click();
	await expect(page.getByText('kaputt.pdf')).toHaveCount(0);
	await expect(page.getByRole('button', { name: 'gut.pdf herunterladen' })).toBeVisible();
	expect(pageErrors).toEqual([]);
});

test('convert bundles a multi-page PDF as a correctly named ZIP', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	await page.goto('/tools/convert');
	await dropFiles(page, pdfDropzone(page), [
		{ name: 'bilder.pdf', mimeType: 'application/pdf', buffer: await createPdf(2, 'Bilder') }
	]);

	const downloadPromise = page.waitForEvent('download');
	await page.getByRole('button', { name: 'Konvertieren & herunterladen' }).click();
	const download = await downloadPromise;
	expect(download.suggestedFilename()).toBe('bilder_bilder.zip');
	expect(download.suggestedFilename()).not.toContain('.pdf');
	expect(pageErrors).toEqual([]);
});

test('cancelling the replacement confirmation keeps the current archive', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a');
	const zipB = await createZip('archiv-b');

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);

	await replaceThroughDialog(page, zipB, false);

	await expect(workspaceStatus(page, /1 ZIP · 1 Archiv geöffnet/)).toBeVisible();
	await expect(page.getByText('2 ZIPs')).toHaveCount(0);
	expect(pageErrors).toEqual([]);
});

test('confirming the replacement opens only the new ZIP and drops stale results', async ({
	page
}) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a', 3);
	const zipB = await createZip('archiv-b');

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	// Replace while the first ZIP may still be extracting; generation guarding
	// must ensure no late result from archiv-a reappears.
	await replaceThroughDialog(page, zipB, true);

	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);
	await expect(page.getByText('1 lose Datei')).toHaveCount(1);
	expect(pageErrors).toEqual([]);
});

test('cancelling the system file picker leaves the workspace unchanged', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a');

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);

	await newZipButton(page).click();
	await replaceZipInput(page).setInputFiles([]);
	await expect(page.getByText('Aktuelle Bearbeitung ersetzen?')).toHaveCount(0);
	await expect(workspaceStatus(page, /1 ZIP · 1 Archiv geöffnet/)).toBeVisible();
	expect(pageErrors).toEqual([]);
});

test('the replacement input accepts the same ZIP twice', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a');
	const zipB = await createZip('archiv-b');

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);

	await replaceThroughDialog(page, zipB, true);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);

	await replaceThroughDialog(page, zipB, true);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);
	await expect(page.getByText('1 lose Datei')).toHaveCount(1);
	expect(pageErrors).toEqual([]);
});

test('appending a ZIP keeps both archive editors visible', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a');
	const zipB = await createZip('archiv-b');

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);

	await settingsButton(page).click();
	await appendZipInput(page).setInputFiles([
		{ name: 'archiv-b.zip', mimeType: 'application/zip', buffer: zipB }
	]);

	await waitForLoadedWorkspace(page, /2 ZIPs · 2 Archive geöffnet/);
	await expect(page.getByText('1 lose Datei')).toHaveCount(2);
	expect(pageErrors).toEqual([]);
});

test('bulk export only appears for two or more processed archives', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a');
	const zipB = await createZip('archiv-b');

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);

	await settingsButton(page).click();
	await expect(
		page.getByRole('button', { name: 'Alle Archive als PDF herunterladen' })
	).toHaveCount(0);

	await appendZipInput(page).setInputFiles([
		{ name: 'archiv-b.zip', mimeType: 'application/zip', buffer: zipB }
	]);
	await waitForLoadedWorkspace(page, /2 ZIPs · 2 Archive geöffnet/);

	// The popover stays open, so the new bulk export action appears in place.
	const exportButton = page.getByRole('button', { name: 'Alle Archive als PDF herunterladen' });
	await expect(exportButton).toBeVisible();

	const downloadPromise = page.waitForEvent('download');
	await exportButton.click();
	await expectPdfDownload(await downloadPromise, /\.pdf$/);
	expect(pageErrors).toEqual([]);
});

test('clearing the workspace requires confirmation and returns to the dropzone', async ({
	page
}) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a');

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);

	await settingsButton(page).click();
	await page.getByRole('button', { name: 'Aktuelle Bearbeitung leeren' }).click();
	await expect(page.getByText('Aktuelle Bearbeitung leeren?')).toBeVisible();
	await page.getByRole('button', { name: 'Abbrechen' }).click();
	await expect(workspaceStatus(page, /1 ZIP · 1 Archiv geöffnet/)).toBeVisible();

	await page.getByRole('button', { name: 'Aktuelle Bearbeitung leeren' }).click();
	await page.getByRole('button', { name: 'Bearbeitung leeren', exact: true }).click();
	await expect(zipDropzone(page)).toBeVisible();
	await expect(newZipButton(page)).toHaveCount(0);
	expect(pageErrors).toEqual([]);
});

test('the preview-size slider works with arrow keys and survives a reload', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a');

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);
	await expect(page.locator('li[style*="width: 200px"]').first()).toBeVisible();

	await settingsButton(page).click();
	const slider = page.getByRole('slider', { name: 'Vorschaugröße' });
	await expect(page.getByText('200 px')).toBeVisible();
	await slider.focus();
	await page.keyboard.press('ArrowRight');
	await expect(page.getByText('201 px')).toBeVisible();
	await expect(page.locator('li[style*="width: 201px"]').first()).toBeVisible();

	await page.reload();
	await page.locator('[data-dropzone-ready="true"]').first().waitFor();
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);
	await settingsButton(page).click();
	await expect(page.getByText('201 px')).toBeVisible();
	await expect(await page.evaluate(() => localStorage.getItem('thumbnailWidth'))).toBe('201');
	expect(pageErrors).toEqual([]);
});

test('settings closes on Escape and outside click and returns focus to its trigger', async ({
	page
}) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a');

	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);

	await expect(settingsButton(page)).toHaveAccessibleName('Einstellungen');
	await settingsButton(page).click();
	await expect(page.getByText('Vorschaugröße')).toBeVisible();
	await page.keyboard.press('Escape');
	await expect(page.getByText('Vorschaugröße')).toHaveCount(0);
	await expect(settingsButton(page)).toBeFocused();

	await settingsButton(page).click();
	await expect(page.getByText('Vorschaugröße')).toBeVisible();
	await page.getByRole('heading', { name: 'beA-Edit' }).click();
	await expect(page.getByText('Vorschaugröße')).toHaveCount(0);
	expect(pageErrors).toEqual([]);
});

test('mobile toolbar and settings popover stay inside the viewport', async ({ page }) => {
	const pageErrors = trackPageErrors(page);
	const zipA = await createZip('archiv-a');

	await page.setViewportSize({ width: 390, height: 844 });
	await page.goto('/tools/bea');
	await dropFiles(page, zipDropzone(page), [
		{ name: 'archiv-a.zip', mimeType: 'application/zip', buffer: zipA }
	]);
	await waitForLoadedWorkspace(page, /1 ZIP · 1 Archiv geöffnet/);

	await settingsButton(page).click();
	const popover = page.locator('[data-slot="popover-content"]');
	await expect(popover).toBeVisible();
	await expect(page.getByText('Weitere ZIP hinzufügen')).toBeVisible();

	const popoverBox = await popover.boundingBox();
	expect(popoverBox).not.toBeNull();
	expect(popoverBox!.x).toBeGreaterThanOrEqual(0);
	expect(popoverBox!.x + popoverBox!.width).toBeLessThanOrEqual(390);
	expect(popoverBox!.y).toBeGreaterThanOrEqual(0);
	expect(popoverBox!.y + popoverBox!.height).toBeLessThanOrEqual(844);
	const popoverMetrics = await popover.evaluate((element) => ({
		scrollWidth: element.scrollWidth,
		clientWidth: element.clientWidth
	}));
	expect(popoverMetrics.scrollWidth).toBeLessThanOrEqual(popoverMetrics.clientWidth);

	// The toolbar sits in normal flow, so it must not cover the archive header.
	const toolbarBox = await workspaceStatus(page, /1 ZIP · 1 Archiv geöffnet/).boundingBox();
	const archiveHeaderBox = await page.getByText('1 lose Datei').first().boundingBox();
	expect(toolbarBox).not.toBeNull();
	expect(archiveHeaderBox).not.toBeNull();
	expect(toolbarBox!.y + toolbarBox!.height).toBeLessThanOrEqual(archiveHeaderBox!.y);

	expect(pageErrors).toEqual([]);
});