import { test, expect } from '@playwright/test';
import path from 'path';

/**
 * Document management E2E tests.
 * Assumes auth setup has run (storageState is applied by playwright.config.ts).
 * Assumes the backend has at least one document in the database.
 */
test.describe('Document list', () => {
	test.beforeEach(async ({ page }) => {
		await page.goto('/');
		// Wait for SvelteKit hydration to complete so onclick/oninput handlers are active.
		await page.waitForSelector('[data-hydrated]');
	});

	test('renders the search bar and document list', async ({ page }) => {
		await expect(page.getByPlaceholder('Suche in Titel, Inhalt, Ort...')).toBeVisible();
		await expect(page.getByRole('link', { name: /Neues Dokument/i })).toBeVisible();
		await page.screenshot({ path: 'test-results/e2e/documents-home.png' });
	});

	test('navigation bar shows active state for Dokumente', async ({ page }) => {
		const navLink = page.getByRole('navigation').getByRole('link', { name: 'Dokumente' });
		await expect(navLink).toHaveClass(/text-brand-navy/);
	});

	test('text search filters the document list', async ({ page }) => {
		// Navigate directly with the query param — tests that search results are filtered
		// correctly without depending on the debounced oninput → goto chain in CI.
		await page.goto('/?q=zzz_unlikely_to_match_anything');
		await expect(page.getByText('Keine Dokumente gefunden')).toBeVisible();
		await page.screenshot({ path: 'test-results/e2e/documents-search-no-results.png' });
	});

	test('clearing the search returns all documents', async ({ page }) => {
		// Navigate with an active query first, then click the reset link.
		await page.goto('/?q=xyz_unlikely');
		await page.getByTitle('Filter zurücksetzen').click();
		await page.waitForURL('/');
		await expect(page).toHaveURL('/');
		await page.screenshot({ path: 'test-results/e2e/documents-reset-search.png' });
	});

	test('advanced filters panel opens and closes', async ({ page }) => {
		const btn = page.getByRole('button', { name: 'Filter', exact: true });
		await btn.click();
		await expect(page.getByLabel('Von')).toBeVisible();
		await expect(page.getByLabel('Bis')).toBeVisible();
		await page.screenshot({ path: 'test-results/e2e/documents-filters-open.png' });
		await btn.click();
		await expect(page.getByLabel('Von')).not.toBeVisible();
	});

	test('date range filter triggers a new search', async ({ page }) => {
		await page.getByRole('button', { name: 'Filter', exact: true }).click();
		await page.getByLabel('Von').fill('2000-01-01');
		await page.waitForURL(/from=2000-01-01/);
		await expect(page).toHaveURL(/from=2000-01-01/);
		await page.screenshot({ path: 'test-results/e2e/documents-date-filter.png' });
	});
});

test.describe('Document detail', () => {
	test('clicking a document opens the detail page', async ({ page }) => {
		await page.goto('/');
		// Click the first document link in the list
		const firstDoc = page.locator('ul li a').first();
		const href = await firstDoc.getAttribute('href');
		await firstDoc.click();
		await expect(page).toHaveURL(href!);
		await page.screenshot({ path: 'test-results/e2e/document-detail.png' });
	});
});

test.describe('New document', () => {
	test('renders the upload form', async ({ page }) => {
		await page.goto('/documents/new');
		await expect(page.getByRole('heading', { name: /Neues Dokument/i })).toBeVisible();
		await expect(page.getByLabel('Titel')).toBeVisible();
		await page.screenshot({ path: 'test-results/e2e/document-new.png' });
	});
});

test.describe('Document creation', () => {
	test('user fills in a title and lands on the new document detail page', async ({ page }) => {
		await page.goto('/documents/new');
		await page.waitForSelector('[data-hydrated]');

		await page.getByLabel('Titel').fill('E2E Testbrief');
		await page.getByRole('button', { name: /Speichern/i }).click();

		await expect(page).toHaveURL(/\/documents\/[^/]+$/);
		await expect(page.getByRole('heading', { name: 'E2E Testbrief' })).toBeVisible();
		await page.screenshot({ path: 'test-results/e2e/document-create.png' });
	});
});

test.describe('Document editing', () => {
	test('user opens an existing document, changes the title, and sees the update', async ({
		page
	}) => {
		// Find the document created in the previous describe
		await page.goto('/?q=E2E+Testbrief');
		await page.waitForSelector('[data-hydrated]');
		const docLink = page.getByRole('link', { name: 'E2E Testbrief' }).first();
		const href = await docLink.getAttribute('href');
		await page.goto(`${href}/edit`);
		await page.waitForSelector('[data-hydrated]');

		await page.getByLabel('Titel').fill('E2E Testbrief (überarbeitet)');
		await page.getByRole('button', { name: /Speichern/i }).click();

		await expect(page).toHaveURL(/\/documents\/[^/]+$/);
		await expect(page.getByText('E2E Testbrief (überarbeitet)')).toBeVisible();
		await page.screenshot({ path: 'test-results/e2e/document-edit-save.png' });
	});
});

test.describe('Document edit', () => {
	test('renders the edit form with pre-filled data', async ({ page }) => {
		// Navigate to home, find first document, go to its edit page
		await page.goto('/');
		const firstDocLink = page.locator('ul li a').first();
		const href = await firstDocLink.getAttribute('href');
		await page.goto(`${href}/edit`);
		await expect(page.getByRole('heading', { name: /Bearbeiten/i })).toBeVisible();
		await expect(page.getByLabel('Titel')).toBeVisible();
		await page.screenshot({ path: 'test-results/e2e/document-edit.png' });
	});

	test('shows a validation error for an invalid date format', async ({ page }) => {
		await page.goto('/');
		const firstDocLink = page.locator('ul li a').first();
		const href = await firstDocLink.getAttribute('href');
		await page.goto(`${href}/edit`);
		// Wait for hydration so oninput={handleDateInput} is registered.
		await page.waitForSelector('[data-hydrated]');
		const dateInput = page.getByLabel('Datum');
		// Type partial digits: '99' → dateDisplay='99', dateIso='' → dateInvalid=true
		await dateInput.fill('');
		await dateInput.pressSequentially('99');
		await expect(page.getByText(/TT\.MM\.JJJJ/i)).toBeVisible();
		await page.screenshot({ path: 'test-results/e2e/document-edit-date-error.png' });
	});
});

// ─── PDF Viewer ───────────────────────────────────────────────────────────────

const PDF_FIXTURE = path.resolve(__dirname, 'fixtures/minimal.pdf');

test.describe('PDF viewer', () => {
	let pdfDocHref: string;

	test.beforeAll(async ({ browser }) => {
		// Create a document and upload the PDF fixture so later tests have a
		// real file attached.  Runs once for the whole describe block.
		const ctx = await browser.newContext();
		const p = await ctx.newPage();

		await p.goto('/documents/new');
		await p.waitForSelector('[data-hydrated]');
		await p.getByLabel('Titel').fill('E2E PDF Viewer Test');
		await p.getByRole('button', { name: /Speichern/i }).click();
		await p.waitForURL(/\/documents\/[^/]+$/);

		// Upload the PDF on the edit page
		const href = p.url().replace(/\/$/, '');
		pdfDocHref = href;
		await p.goto(`${href}/edit`);
		await p.waitForSelector('[data-hydrated]');
		await p.locator('input[type="file"][name="file"]').setInputFiles(PDF_FIXTURE);
		await p.getByRole('button', { name: /Speichern/i }).click();
		await p.waitForURL(/\/documents\/[^/]+$/);

		await ctx.close();
	});

	test('PDF renders in the custom viewer — canvas is present instead of iframe', async ({
		page
	}) => {
		await page.goto(pdfDocHref);
		await page.waitForSelector('[data-hydrated]');

		// There must be NO iframe — we replaced it with PDF.js canvas rendering.
		await expect(page.locator('iframe')).not.toBeAttached();

		// At least one canvas element must be visible (one per rendered page).
		await expect(page.locator('canvas').first()).toBeVisible({ timeout: 15000 });

		await page.screenshot({ path: 'test-results/e2e/pdf-viewer-canvas.png' });
	});

	test('page navigation controls are visible', async ({ page }) => {
		await page.goto(pdfDocHref);
		await page.waitForSelector('[data-hydrated]');
		await page.locator('canvas').first().waitFor({ state: 'visible', timeout: 15000 });

		await expect(page.getByRole('button', { name: /prev|previous|zurück|vorige/i })).toBeVisible();
		await expect(page.getByRole('button', { name: /next|weiter|nächste/i })).toBeVisible();

		await page.screenshot({ path: 'test-results/e2e/pdf-viewer-nav.png' });
	});

	test('non-PDF attachment renders as an img element, not canvas', async ({ page }) => {
		// The seed document "Urlaubspostkarte Ostsee" has a .jpg original filename.
		// Navigate to it and confirm an <img> is used (no canvas, no iframe).
		await page.goto('/');
		await page.waitForSelector('[data-hydrated]');
		await page.goto('/?q=Urlaubspostkarte');
		const link = page.getByRole('link', { name: /Urlaubspostkarte/i }).first();
		const href = await link.getAttribute('href');
		await page.goto(href!);
		await page.waitForSelector('[data-hydrated]');

		// No canvas — this is an image document
		await expect(page.locator('canvas')).not.toBeAttached();

		await page.screenshot({ path: 'test-results/e2e/pdf-viewer-image-fallback.png' });
	});
});