import { expect, type Page } from '@playwright/test';
import { test } from '../../fixtures/multi-client';
import { installTestServerEndpoints } from '../../helpers/seed-test-endpoint';
import { startTestServer } from '../../helpers/test-server';
import { readSignalServerCredentialFromPage } from '../../helpers/auth-api';
import { RegisterPage } from '../../pages/register.page';
import { ServerSearchPage } from '../../pages/server-search.page';
import { ChatMessagesPage } from '../../pages/chat-messages.page';

/**
 * P4 coverage: one human must own one DM thread, and a call that reached
 * nobody must not look live.
 *
 * The fork this guards against: a peer on another signal server addresses the
 * local user by their provisioned actor id, so the inbound conversation id does
 * not match the id the local user builds from their home identity. Before the
 * canonicalization the recipient ended up with two threads for the same human -
 * one holding the peer's messages, one empty - and clicking the peer opened the
 * empty one.
 */
const USER_PASSWORD = 'TestPass123!';
const PRIMARY_SIGNAL_ID = 'e2e-dm-identity-primary';
const SECONDARY_SIGNAL_ID = 'e2e-dm-identity-secondary';

test.describe('Cross-signal direct message identity', () => {
  test.describe.configure({ timeout: 240_000 });

  test('keeps one DM thread when the peer addresses the local user by a provisioned actor id', async ({
    createClient,
    testServer
  }) => {
    const secondaryServer = await startTestServer();

    try {
      const suffix = uniqueName('xsig-dm');
      const serverName = `Cross Signal DM ${suffix}`;
      const message = `cross signal hello ${suffix}`;
      const alice = await createClient();
      const bob = await createClient();
      const endpoints = [
        {
          id: PRIMARY_SIGNAL_ID,
          name: 'E2E DM Signal A',
          url: testServer.url,
          isActive: true,
          status: 'online'
        },
        {
          id: SECONDARY_SIGNAL_ID,
          name: 'E2E DM Signal B',
          url: secondaryServer.url,
          isActive: true,
          status: 'online'
        }
      ];

      await installTestServerEndpoints(alice.context, endpoints);
      await installTestServerEndpoints(bob.context, endpoints);

      await test.step('Alice is home on signal A, Bob on signal B', async () => {
        await registerOn(alice.page, PRIMARY_SIGNAL_ID, `alice_${suffix}`, 'Alice');
        await registerOn(bob.page, SECONDARY_SIGNAL_ID, `bob_${suffix}`, 'Bob');
      });

      await test.step('They meet in a room on signal A, so Bob acts through a provisioned identity', async () => {
        await new ServerSearchPage(alice.page).createServer(serverName, {
          description: 'Cross-signal DM identity coverage',
          sourceId: PRIMARY_SIGNAL_ID
        });

        await expect(alice.page).toHaveURL(/\/room\//, { timeout: 20_000 });
        await new ChatMessagesPage(alice.page).waitForReady();

        await new ServerSearchPage(bob.page).joinServerFromSearch(serverName);
        await expect(bob.page).toHaveURL(/\/room\//, { timeout: 20_000 });
        await new ChatMessagesPage(bob.page).waitForReady();

        await expect
          .poll(async () => await readSignalServerCredentialFromPage(bob.page, testServer.url), { timeout: 30_000 })
          .not.toBeNull();
      });

      await test.step('Alice sends Bob a DM addressed to his provisioned actor id', async () => {
        await openDmFromRoomUserCard(alice.page, 'Bob');
        await alice.page.getByTestId('dm-input').fill(message);
        await alice.page.getByTestId('dm-input').press('Enter');

        // Bob stores the thread before he ever opens the DM view, so the
        // inbound conversation id is the only id his device knows.
        await expect
          .poll(async () => await countStoredConversations(bob.page), { timeout: 30_000 })
          .toBeGreaterThan(0);
      });

      await test.step('Bob opens Alice and finds one thread holding her message', async () => {
        await openDmFromRoomUserCard(bob.page, 'Alice');

        await expect(bob.page.locator('app-dm-chat').getByText(message)).toBeVisible({ timeout: 20_000 });
        await expect(bob.page.locator('app-dm-conversation-item')).toHaveCount(1, { timeout: 20_000 });
        expect(await countStoredConversations(bob.page)).toBe(1);
      });
    } finally {
      await secondaryServer.stop();
    }
  });

  test('surfaces an undelivered ring instead of a call that looks live', async ({ createClient }) => {
    const suffix = uniqueName('undelivered-ring');
    const serverName = `Undelivered Ring ${suffix}`;
    const alice = await createClient();
    const bob = await createClient();

    await test.step('Alice and Bob meet in a room', async () => {
      await registerOn(alice.page, null, `alice_${suffix}`, 'Alice');
      await registerOn(bob.page, null, `bob_${suffix}`, 'Bob');

      await new ServerSearchPage(alice.page).createServer(serverName, {
        description: 'Undelivered call ring coverage'
      });

      await expect(alice.page).toHaveURL(/\/room\//, { timeout: 20_000 });
      await new ChatMessagesPage(alice.page).waitForReady();

      await new ServerSearchPage(bob.page).joinServerFromSearch(serverName);
      await expect(bob.page).toHaveURL(/\/room\//, { timeout: 20_000 });
      await new ChatMessagesPage(bob.page).waitForReady();
    });

    await test.step('Alice calls Bob with no transport that can carry the ring', async () => {
      await openDmFromRoomUserCard(alice.page, 'Bob');
      await alice.page.evaluate(() => window.simulateOffline?.());

      const callButton = alice.page.locator('app-dm-chat header').getByRole('button', { name: 'Call Bob' });

      await expect(callButton).toBeEnabled({ timeout: 20_000 });
      await callButton.click();
      await expect(alice.page).toHaveURL(/\/call\//, { timeout: 20_000 });
    });

    await test.step('The call view says the ring reached nobody', async () => {
      await expect(alice.page.getByTestId('private-call-error')).toContainText('Could not reach anyone', {
        timeout: 20_000
      });

      await expect(bob.page.getByRole('dialog', { name: /is calling/ })).toBeHidden();
    });
  });
});

async function registerOn(
  page: Page,
  signalServerId: string | null,
  username: string,
  displayName: string
): Promise<void> {
  const registerPage = new RegisterPage(page);

  await registerPage.goto();

  if (signalServerId) {
    await registerPage.serverSelect.selectOption(signalServerId);
  }

  await registerPage.register(username, displayName, USER_PASSWORD);
  await expect(page).toHaveURL(/\/dashboard/, { timeout: 20_000 });
}

async function openDmFromRoomUserCard(page: Page, displayName: string): Promise<void> {
  const userCard = page.locator('[data-testid^="room-user-card-"]', { hasText: displayName }).first();

  await expect(userCard).toBeVisible({ timeout: 20_000 });
  await userCard.getByRole('button', { name: `Message ${displayName}` }).click();
  await expect(page).toHaveURL(/\/dm\//, { timeout: 20_000 });
  await expect(page.getByRole('heading', { name: displayName })).toBeVisible({ timeout: 20_000 });
}

/** Count stored DM threads for whichever user owns this browser profile. */
async function countStoredConversations(page: Page): Promise<number> {
  return await page.evaluate(() => {
    const prefix = 'metoyou_direct_message_conversations:';

    let total = 0;

    for (let index = 0; index < localStorage.length; index++) {
      const key = localStorage.key(index);

      if (!key?.startsWith(prefix)) {
        continue;
      }

      try {
        const parsed = JSON.parse(localStorage.getItem(key) ?? '[]') as unknown[];

        total += Array.isArray(parsed) ? parsed.length : 0;
      } catch {
        // A half-written entry is not a thread.
      }
    }

    return total;
  });
}

function uniqueName(prefix: string): string {
  return `${prefix}-${Date.now()}-${Math.random().toString(36)
    .slice(2, 8)}`;
}