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

import { contextForUser } from './helpers';

/**
 * Image paste/drop/insert pack (issue #28). Runs against the local dev
 * stack (api + web); no Mailpit needed. A tiny 1x1 PNG stands in for a
 * "screenshot" — only the magic bytes matter to the upload endpoint (#27).
 */
const BASE_URL = process.env.E2E_BASE_URL ?? 'http://localhost:5173';
const PNG_BASE64 =
  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=';

async function createPage(
  context: Awaited<ReturnType<typeof contextForUser>>,
  title: string,
): Promise<{ pondSlug: string; pageSlug: string }> {
  const ponds = await context.request.get('/api/v1/ponds');
  const pond = (await ponds.json()).find((p: { type: string }) => p.type === 'personal');
  const created = await context.request.post(`/api/v1/ponds/${pond.id}/pages`, {
    data: { title },
  });
  const page = await created.json();
  return { pondSlug: pond.slug, pageSlug: page.slug };
}

async function enterEditMode(page: Page): Promise<void> {
  await page.getByRole('button', { name: /edit|bearbeiten/i }).click();
  await expect(page.locator('.ProseMirror')).toHaveAttribute('contenteditable', 'true');
}

/** Dispatches a real `ClipboardEvent` carrying an image `File`, built and
 * fired entirely inside the page — Playwright's `dispatchEvent` helper only
 * special-cases `dataTransfer` (for drag events), not `clipboardData`, so a
 * paste-with-files has to be constructed with the native constructor here
 * instead of via `evaluateHandle` + `locator.dispatchEvent`. */
async function pasteImage(page: Page, filename: string): Promise<void> {
  await page.evaluate(
    async ({ base64, name }) => {
      const el = document.querySelector('.ProseMirror');
      const response = await fetch(`data:image/png;base64,${base64}`);
      const blob = await response.blob();
      const file = new File([blob], name, { type: 'image/png' });
      const dataTransfer = new DataTransfer();
      dataTransfer.items.add(file);
      el!.dispatchEvent(
        new ClipboardEvent('paste', {
          clipboardData: dataTransfer,
          bubbles: true,
          cancelable: true,
        }),
      );
    },
    { base64: PNG_BASE64, name: filename },
  );
}

/** Drop needs real viewport coordinates: ProseMirror resolves `posAtCoords`
 * from `event.clientX/Y` before ever calling `handleDrop`, and bails out
 * (never reaching our plugin) if they don't land inside the content. */
async function dropImage(page: Page, filename: string): Promise<void> {
  const box = await page.locator('.ProseMirror').boundingBox();
  if (!box) throw new Error('.ProseMirror has no bounding box');
  const dataTransfer = await page.evaluateHandle(
    async ({ base64, name }) => {
      const response = await fetch(`data:image/png;base64,${base64}`);
      const blob = await response.blob();
      const file = new File([blob], name, { type: 'image/png' });
      const dt = new DataTransfer();
      dt.items.add(file);
      return dt;
    },
    { base64: PNG_BASE64, name: filename },
  );
  await page.locator('.ProseMirror').dispatchEvent('drop', {
    dataTransfer,
    clientX: box.x + box.width / 2,
    clientY: box.y + box.height / 2,
  });
}

test('pasting an image inserts it at the cursor after upload', async ({ browser }) => {
  const context = await contextForUser(browser, BASE_URL, 'fixture-user');
  const { pondSlug, pageSlug } = await createPage(context, `E2E Paste ${Date.now()}`);
  const page = await context.newPage();

  await page.goto(`/p/${pondSlug}/${pageSlug}`);
  await enterEditMode(page);
  await page.locator('.ProseMirror').click();

  await pasteImage(page, 'screenshot.png');

  await expect(page.locator('.ProseMirror img[src^="/api/v1/media/"]')).toBeVisible({
    timeout: 10000,
  });
  await expect(page.locator('.editor-image-upload')).toHaveCount(0);

  await context.close();
});

test('toolbar file picker inserts an image', async ({ browser }) => {
  const context = await contextForUser(browser, BASE_URL, 'fixture-user');
  const { pondSlug, pageSlug } = await createPage(context, `E2E Picker ${Date.now()}`);
  const page = await context.newPage();

  await page.goto(`/p/${pondSlug}/${pageSlug}`);
  await enterEditMode(page);

  await page.getByRole('button', { name: /insert image|bild einfügen/i }).click();
  await page.locator('input[type="file"]').setInputFiles({
    name: 'picked.png',
    mimeType: 'image/png',
    buffer: Buffer.from(PNG_BASE64, 'base64'),
  });

  await expect(page.locator('.ProseMirror img[src^="/api/v1/media/"]')).toBeVisible({
    timeout: 10000,
  });

  await context.close();
});

test('drag-and-drop of an image file inserts it', async ({ browser }) => {
  const context = await contextForUser(browser, BASE_URL, 'fixture-user');
  const { pondSlug, pageSlug } = await createPage(context, `E2E Drop ${Date.now()}`);
  const page = await context.newPage();

  await page.goto(`/p/${pondSlug}/${pageSlug}`);
  await enterEditMode(page);
  await page.locator('.ProseMirror').click();

  await dropImage(page, 'dropped.png');

  await expect(page.locator('.ProseMirror img[src^="/api/v1/media/"]')).toBeVisible({
    timeout: 10000,
  });

  await context.close();
});

test('alt text is editable and persists in the document', async ({ browser }) => {
  const context = await contextForUser(browser, BASE_URL, 'fixture-user');
  const { pondSlug, pageSlug } = await createPage(context, `E2E Alt ${Date.now()}`);
  const page = await context.newPage();

  await page.goto(`/p/${pondSlug}/${pageSlug}`);
  await enterEditMode(page);
  await page.locator('.ProseMirror').click();

  await pasteImage(page, 'alt-test.png');
  const image = page.locator('.ProseMirror img[src^="/api/v1/media/"]');
  await expect(image).toBeVisible({ timeout: 10000 });

  await image.click();
  const altInput = page.locator('.editor-image__alt input');
  await expect(altInput).toBeVisible();
  await altInput.fill('A lovely test screenshot');
  await expect(image).toHaveAttribute('alt', 'A lovely test screenshot');

  await expect(page.getByRole('status')).toHaveText(/saved|gespeichert/i, { timeout: 10000 });
  await page.reload();
  await enterEditMode(page);
  await expect(page.locator('.ProseMirror img[src^="/api/v1/media/"]')).toHaveAttribute(
    'alt',
    'A lovely test screenshot',
  );

  await context.close();
});

test('a failed upload never leaves a broken node in the document', async ({ browser }) => {
  const context = await contextForUser(browser, BASE_URL, 'fixture-user');
  const { pondSlug, pageSlug } = await createPage(context, `E2E Fail ${Date.now()}`);
  await context.route('**/api/v1/ponds/*/files', (route) => route.abort('failed'));
  const page = await context.newPage();

  await page.goto(`/p/${pondSlug}/${pageSlug}`);
  await enterEditMode(page);
  await page.locator('.ProseMirror').click();

  await pasteImage(page, 'will-fail.png');

  await expect(page.locator('.editor-image-upload--error')).toBeVisible();
  await expect(page.locator('.editor-image-upload')).toHaveCount(0, { timeout: 10000 });
  await expect(page.locator('.ProseMirror img')).toHaveCount(0);

  await context.close();
});