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

import { contextForUser } from './helpers';

/**
 * Knowledge-graph pack (issues #111–#113): the pond graph view (nodes,
 * edges, phantom-create flow, legend), the local neighborhood panel with
 * its hop toggle, and the permission slice — a label-denied reader must
 * not see the hidden page anywhere in the graph. Wikilinks are typed in
 * the editor; a reload flushes the collab store into `page_links` (same
 * ordering constraint as the backlinks pack).
 */
const BASE_URL = process.env.E2E_BASE_URL ?? 'http://localhost:5173';

async function json<T>(
  context: BrowserContext,
  method: 'post' | 'get',
  url: string,
  data?: unknown,
): Promise<T> {
  const response = await context.request[method](url, data !== undefined ? { data } : {});
  if (!response.ok()) throw new Error(`${method} ${url} → ${response.status()}`);
  return response.json() as Promise<T>;
}

interface PageRef {
  id: string;
  slug: string;
}

async function createPage(
  context: BrowserContext,
  pondId: string,
  title: string,
): Promise<PageRef> {
  return json(context, 'post', `/api/v1/ponds/${pondId}/pages`, { title });
}

/** Types `[[query` in the open editor and accepts the first suggestion. */
async function insertWikilink(page: Page, query: string): Promise<void> {
  const body = page.locator('.editor-content .ProseMirror');
  await body.click();
  await page.keyboard.type(`[[${query}`);
  await expect(page.locator('.wikilink-suggest')).toBeVisible();
  await page.keyboard.press('Enter');
}

test('pond graph renders the link structure and creates phantom pages', async ({ browser }) => {
  const context = await contextForUser(browser, BASE_URL, 'fixture-user');
  const ts = Date.now();
  const pond = await json<{ id: string; slug: string }>(context, 'post', '/api/v1/ponds', {
    name: `Graph Pack ${ts}`,
  });
  const source = await createPage(context, pond.id, `GP Source ${ts}`);
  const target = await createPage(context, pond.id, `GP Target ${ts}`);

  const page = await context.newPage();
  await page.goto(`/p/${pond.slug}/${source.slug}`);
  await page.locator('.editor-page__mode-toggle').click();
  await insertWikilink(page, `GP Target ${ts}`);
  await page.keyboard.type(' ');
  // No page matches → the suggestion creates a phantom link.
  await insertWikilink(page, `gp-ghost-${ts}`);
  await page.reload(); // flush the collab store → page_links rows

  // The sidebar links every member to the graph route.
  await page.locator('.sidebar__graph-link').click();
  await expect(page).toHaveURL(new RegExp(`/p/${pond.slug}/graph$`));
  await expect(page.getByTestId(`graph-node-${source.slug}`)).toBeVisible();
  await expect(page.getByTestId(`graph-node-${target.slug}`)).toBeVisible();
  await expect(page.getByTestId(`graph-phantom-gp-ghost-${ts}`)).toBeVisible();
  expect(await page.locator('.force-graph__edge').count()).toBeGreaterThanOrEqual(2);
  await expect(page.locator('.graph-legend')).toBeVisible();

  // A node click opens the page.
  await page.getByTestId(`graph-node-${target.slug}`).click();
  await expect(page).toHaveURL(new RegExp(`/p/${pond.slug}/${target.slug}$`));

  // A phantom click creates the page (confirm) and resolves the links.
  page.on('dialog', (dialog) => void dialog.accept());
  await page.goto(`/p/${pond.slug}/graph`);
  await page.getByTestId(`graph-phantom-gp-ghost-${ts}`).click();
  await expect(page).toHaveURL(new RegExp(`/p/${pond.slug}/gp-ghost-${ts}$`));
  await page.goto(`/p/${pond.slug}/graph`);
  await expect(page.getByTestId(`graph-node-gp-ghost-${ts}`)).toBeVisible();
  await expect(page.getByTestId(`graph-phantom-gp-ghost-${ts}`)).toHaveCount(0);

  await context.close();
});

test('local graph panel shows the neighborhood per hop depth and navigates', async ({
  browser,
}) => {
  const context = await contextForUser(browser, BASE_URL, 'fixture-user');
  const ts = Date.now();
  const pond = await json<{ id: string; slug: string }>(context, 'post', '/api/v1/ponds', {
    name: `Local Graph ${ts}`,
  });
  const a = await createPage(context, pond.id, `LG A ${ts}`);
  const b = await createPage(context, pond.id, `LG B ${ts}`);
  const c = await createPage(context, pond.id, `LG C ${ts}`);
  const lonely = await createPage(context, pond.id, `LG Lonely ${ts}`);

  // Chain A → B → C so the hop depth matters when viewed from A.
  const page = await context.newPage();
  await page.goto(`/p/${pond.slug}/${a.slug}`);
  await page.locator('.editor-page__mode-toggle').click();
  await insertWikilink(page, `LG B ${ts}`);
  await page.goto(`/p/${pond.slug}/${b.slug}`);
  await page.locator('.editor-page__mode-toggle').click();
  await insertWikilink(page, `LG C ${ts}`);
  await page.reload();

  await page.goto(`/p/${pond.slug}/${a.slug}`);
  const panel = page.locator('.local-graph');
  await expect(panel).toBeVisible();
  await expect(page.getByTestId(`local-graph-node-${b.slug}`)).toBeVisible();
  await expect(page.getByTestId(`local-graph-node-${c.slug}`)).toHaveCount(0);
  // The current page carries the highlight ring.
  await expect(
    page.getByTestId(`local-graph-node-${a.slug}`).locator('.force-graph__ring'),
  ).toHaveCount(1);

  await panel.getByRole('button', { name: /two hops|zwei ebenen/i }).click();
  await expect(page.getByTestId(`local-graph-node-${c.slug}`)).toBeVisible();

  await page.getByTestId(`local-graph-node-${b.slug}`).click();
  await expect(page).toHaveURL(new RegExp(`/p/${pond.slug}/${b.slug}$`));

  // Pages without links show no panel at all.
  await page.goto(`/p/${pond.slug}/${lonely.slug}`);
  await expect(page.locator('.editor-content .ProseMirror')).toBeVisible();
  await expect(page.locator('.local-graph')).toHaveCount(0);

  await context.close();
});

test('a label-denied reader sees no trace of the hidden page in the graph', async ({ browser }) => {
  const owner = await contextForUser(browser, BASE_URL, 'fixture-user');
  const viewer = await contextForUser(browser, BASE_URL, 'fixture-viewer');
  const viewerId = (await json<{ id: string }>(viewer, 'get', '/api/v1/auth/me')).id;
  const ts = Date.now();
  const pond = await json<{ id: string; slug: string }>(owner, 'post', '/api/v1/ponds', {
    name: `Sliced Graph ${ts}`,
  });
  // Grants BEFORE content: pond-wide read for the viewer, minus the label.
  const label = await json<{ id: string }>(owner, 'post', `/api/v1/ponds/${pond.id}/labels`, {
    name: 'secret',
  });
  await json(owner, 'post', `/api/v1/ponds/${pond.id}/grants`, {
    subjectType: 'user',
    subjectId: viewerId,
    role: 'reader',
    scopeType: 'pond',
    effect: 'allow',
  });
  await json(owner, 'post', `/api/v1/ponds/${pond.id}/grants`, {
    subjectType: 'user',
    subjectId: viewerId,
    role: 'reader',
    scopeType: 'label',
    scopeId: label.id,
    effect: 'deny',
  });

  const open = await createPage(owner, pond.id, `SG Open ${ts}`);
  const secret = await createPage(owner, pond.id, `SG Secret ${ts}`);
  await json(owner, 'post', `/api/v1/pages/${secret.id}/labels`, { labelId: label.id });

  // Owner links the open page to the secret one.
  const ownerPage = await owner.newPage();
  await ownerPage.goto(`/p/${pond.slug}/${open.slug}`);
  await ownerPage.locator('.editor-page__mode-toggle').click();
  await insertWikilink(ownerPage, `SG Secret ${ts}`);
  await ownerPage.reload();
  await ownerPage.goto(`/p/${pond.slug}/graph`);
  await expect(ownerPage.getByTestId(`graph-node-${secret.slug}`)).toBeVisible();
  expect(await ownerPage.locator('.force-graph__edge').count()).toBe(1);

  // The viewer gets the sliced graph: no secret node, no edge into it.
  const viewerPage = await viewer.newPage();
  await viewerPage.goto(`/p/${pond.slug}/graph`);
  await expect(viewerPage.getByTestId(`graph-node-${open.slug}`)).toBeVisible();
  await expect(viewerPage.getByTestId(`graph-node-${secret.slug}`)).toHaveCount(0);
  expect(await viewerPage.locator('.force-graph__edge').count()).toBe(0);

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