import { strToU8, zipSync } from 'fflate';
import { expect, test } from '@playwright/test';
import type { BrowserContext, Page } from '@playwright/test';

import { contextForUser } from './helpers';
import { BLOCK_PLUGIN_SOURCE, blockManifest } from './plugin-fixtures';

/**
 * Block plugins end to end (issue #76): the fixture block plugin (see
 * plugin-fixtures.ts) is installed as `required`, then driven through the
 * acceptance criteria — insert → edit → reload round-trip, live collab
 * updates, disable→fallback→re-enable without document mutation, and
 * copy/paste within and across pages. Selectors are language-neutral
 * (classes and iframe content, not labels).
 */
const BASE_URL = process.env.E2E_BASE_URL ?? 'http://localhost:5173';
const PLUGIN_ID = 'e2e-block';
const PLUGIN_NAME = 'E2E Block';

function pluginZip(): Buffer {
  return Buffer.from(
    zipSync({
      'manifest.json': strToU8(JSON.stringify(blockManifest(PLUGIN_ID, PLUGIN_NAME))),
      'plugin.js': strToU8(BLOCK_PLUGIN_SOURCE),
    }),
  );
}

async function installAsRequired(admin: BrowserContext): Promise<void> {
  await admin.request.patch(`/api/v1/admin/plugins/${PLUGIN_ID}/mode`, {
    data: { mode: 'disabled' },
  });
  await admin.request.delete(`/api/v1/admin/plugins/${PLUGIN_ID}`);
  const installed = await admin.request.post('/api/v1/admin/plugins', {
    multipart: {
      file: { name: `${PLUGIN_ID}.zip`, mimeType: 'application/zip', buffer: pluginZip() },
    },
  });
  expect(installed.status(), await installed.text()).toBe(201);
  const mode = await admin.request.patch(`/api/v1/admin/plugins/${PLUGIN_ID}/mode`, {
    data: { mode: 'required' },
  });
  expect(mode.status(), await mode.text()).toBe(200);
}

async function setMode(admin: BrowserContext, mode: string): Promise<void> {
  const res = await admin.request.patch(`/api/v1/admin/plugins/${PLUGIN_ID}/mode`, {
    data: { mode },
  });
  expect(res.status(), await res.text()).toBe(200);
}

async function personalPond(context: BrowserContext): Promise<{ id: string; slug: string }> {
  const ponds = await context.request.get('/api/v1/ponds');
  const pond = (await ponds.json()).find((p: { type: string }) => p.type === 'personal');
  return { id: pond.id, slug: pond.slug };
}

async function createPage(
  context: BrowserContext,
  pondId: string,
  title: string,
): Promise<{ id: string; slug: string }> {
  const created = await context.request.post(`/api/v1/ponds/${pondId}/pages`, {
    data: { title },
  });
  return created.json();
}

/** Opens the page in edit mode and waits for the live connection. */
async function openEditor(context: BrowserContext, pondSlug: string, slug: string): Promise<Page> {
  const page = await context.newPage();
  await page.goto(`/p/${pondSlug}/${slug}`);
  await page.getByRole('button', { name: /edit|bearbeiten/i }).click();
  await expect(page.locator('.ProseMirror')).toHaveAttribute('contenteditable', 'true');
  await expect(page.locator('.editor-connection')).toHaveAttribute('data-status', 'connected', {
    timeout: 15000,
  });
  return page;
}

/** The rendered body of the block plugin's sandbox frame on `page`. */
function frameBody(page: Page, nth = 0) {
  return page.frameLocator(`.plugin-block iframe >> nth=${nth}`).locator('body');
}

async function insertBlock(page: Page): Promise<void> {
  await page.locator('.editor-toolbar__block-select').selectOption(`${PLUGIN_ID}/note`);
  await expect(page.locator('.plugin-block__surface')).toHaveAttribute('data-state', 'ready', {
    timeout: 10000,
  });
}

test('a block round-trips: insert → edit data → reload → render', async ({ browser }) => {
  const admin = await contextForUser(browser, BASE_URL, 'fixture-admin');
  await installAsRequired(admin);
  const pond = await personalPond(admin);
  const created = await createPage(admin, pond.id, `E2E Block Roundtrip ${Date.now()}`);

  const page = await openEditor(admin, pond.slug, created.slug);
  await insertBlock(page);
  await expect(frameBody(page)).toHaveText('block:empty', { timeout: 10000 });

  // The edit affordance switches the frame to edit mode; the fixture persists
  // "+e" through blockData.setData (→ node attrs → Yjs document).
  await page.locator('.plugin-block__bar button').click();
  await expect(frameBody(page)).toHaveText('editing:+e');
  await page.locator('.plugin-block__bar button').click();
  await expect(frameBody(page)).toHaveText('block:+e');

  // Persisted: a fresh load (read mode) renders the stored data.
  await page.reload();
  await expect(frameBody(page)).toHaveText('block:+e', { timeout: 15000 });

  await admin.close();
});

test('two collaborating users see block-data changes live', async ({ browser }) => {
  const owner = await contextForUser(browser, BASE_URL, 'fixture-user');
  const admin = await contextForUser(browser, BASE_URL, 'fixture-admin');
  await installAsRequired(admin);
  const pond = await personalPond(owner);
  const created = await createPage(owner, pond.id, `E2E Block Collab ${Date.now()}`);

  const pageA = await openEditor(owner, pond.slug, created.slug);
  const pageB = await openEditor(admin, pond.slug, created.slug);

  await insertBlock(pageA);
  // The block arrives at the collaborator and renders through their sandbox.
  await expect(frameBody(pageB)).toHaveText('block:empty', { timeout: 15000 });

  // A data change by one user re-renders the other user's frame live.
  await pageA.locator('.plugin-block__bar button').click();
  await expect(frameBody(pageA)).toHaveText('editing:+e');
  await expect(frameBody(pageB)).toHaveText('block:+e', { timeout: 10000 });

  await owner.close();
  await admin.close();
});

test('disabling renders the fallback without document mutation; re-enabling restores', async ({
  browser,
}) => {
  const admin = await contextForUser(browser, BASE_URL, 'fixture-admin');
  await installAsRequired(admin);
  const pond = await personalPond(admin);
  const created = await createPage(admin, pond.id, `E2E Block Fallback ${Date.now()}`);

  const page = await openEditor(admin, pond.slug, created.slug);
  await insertBlock(page);
  await page.locator('.plugin-block__bar button').click();
  await expect(frameBody(page)).toHaveText('editing:+e');

  // Give the collab autosave a moment to persist before reloading around the
  // mode switch (the export below reads the server-side cache).
  await page.locator('.plugin-block__bar button').click();
  await expect(frameBody(page)).toHaveText('block:+e');

  await setMode(admin, 'disabled');
  await page.reload();
  const fallback = page.locator('.plugin-block__fallback');
  await expect(fallback).toContainText(`[${PLUGIN_NAME}]`, { timeout: 15000 });

  // The document itself still carries the block with its data (no mutation):
  // the markdown export keeps the reserved fence and the edited payload.
  await expect
    .poll(
      async () => {
        const md = await admin.request.get(`/api/v1/pages/${created.id}/export/markdown`);
        return md.text();
      },
      { timeout: 15000 },
    )
    .toContain('dorfteich-plugin');
  const markdown = await (
    await admin.request.get(`/api/v1/pages/${created.id}/export/markdown`)
  ).text();
  expect(markdown).toContain('"text":"+e"');

  // Re-enabling brings the live surface back.
  await setMode(admin, 'required');
  await page.reload();
  await expect(frameBody(page)).toHaveText('block:+e', { timeout: 15000 });

  await admin.close();
});

test('copy/paste preserves block data within and across pages', async ({ browser }) => {
  const admin = await contextForUser(browser, BASE_URL, 'fixture-admin');
  await admin.grantPermissions(['clipboard-read', 'clipboard-write']);
  await installAsRequired(admin);
  const pond = await personalPond(admin);
  const pageOne = await createPage(admin, pond.id, `E2E Block Copy A ${Date.now()}`);
  const pageTwo = await createPage(admin, pond.id, `E2E Block Copy B ${Date.now()}`);

  const page = await openEditor(admin, pond.slug, pageOne.slug);
  // A text anchor above the block gives the later paste a reliable cursor
  // home (clicking an atom node only ever yields a node selection).
  await page.locator('.ProseMirror').click();
  await page.keyboard.type('anchor');
  await insertBlock(page);
  await page.locator('.plugin-block__bar button').click();
  await expect(frameBody(page)).toHaveText('editing:+e');
  await page.locator('.plugin-block__bar button').click();
  await expect(frameBody(page)).toHaveText('block:+e');

  // Select the block node (clicks inside the sandbox iframe never reach the
  // editor — the bar is host DOM) and copy it: the markdown clipboard
  // serializer puts the reserved fence with the data JSON on text/plain.
  await page.locator('.plugin-block__bar').click();
  await expect(page.locator('.plugin-block')).toHaveClass(/plugin-block--selected/);
  // Synthetic copy event: ProseMirror serializes the node selection into the
  // event's DataTransfer (native clipboard keys need editor focus, which the
  // non-editable bar click does not grant in headless Chromium).
  const clipboardText = await page.evaluate(() => {
    const dataTransfer = new DataTransfer();
    document.querySelector('.ProseMirror')!.dispatchEvent(
      new ClipboardEvent('copy', {
        clipboardData: dataTransfer,
        bubbles: true,
        cancelable: true,
      }),
    );
    return dataTransfer.getData('text/plain');
  });
  expect(clipboardText).toContain('dorfteich-plugin e2e-block/note');
  expect(clipboardText).toContain('"text":"+e"');

  // Paste within the same page (synthetic event — headless Chromium does not
  // feed the real clipboard into a keyboard paste). ArrowRight first: pasting
  // onto the still-selected node would replace it instead of adding one.
  const pasteMarkdown = async () => {
    await page.evaluate((text) => {
      const dataTransfer = new DataTransfer();
      dataTransfer.setData('text/plain', text);
      document.querySelector('.ProseMirror')!.dispatchEvent(
        new ClipboardEvent('paste', {
          clipboardData: dataTransfer,
          bubbles: true,
          cancelable: true,
        }),
      );
    }, clipboardText);
  };
  // Park the cursor in the anchor text (a real text click focuses the editor
  // and clears the node selection — pasting onto the selected node would
  // replace it instead of adding one), then paste.
  await page.locator('.ProseMirror p', { hasText: 'anchor' }).click();
  await page.keyboard.press('End');
  await pasteMarkdown();
  await expect(page.locator('.plugin-block')).toHaveCount(2);
  await expect(frameBody(page, 1)).toHaveText('block:+e', { timeout: 10000 });

  // Paste across pages of the same pond.
  await page.goto(`/p/${pond.slug}/${pageTwo.slug}`);
  await page.getByRole('button', { name: /edit|bearbeiten/i }).click();
  const editor = page.locator('.ProseMirror');
  await expect(editor).toHaveAttribute('contenteditable', 'true');
  await editor.click();
  await pasteMarkdown();
  await expect(frameBody(page)).toHaveText('block:+e', { timeout: 10000 });

  await admin.close();
});