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

/**
 * Tier 3 (Gitea #220): regression tests against a throwaway Synapse the job
 * starts itself (`scripts/dev-homeserver.sh start`). No prod secrets. Set
 * E2E_LOCAL_HS (default http://localhost:8008) — the spec skips when the
 * server isn't reachable.
 */
export const HS = process.env.E2E_LOCAL_HS || 'http://localhost:8008';
export const PASSWORD = 'password123';
export const enc = encodeURIComponent;

export async function hsReachable(): Promise<boolean> {
  try {
    const res = await fetch(`${HS}/_matrix/client/versions`);
    return res.ok;
  } catch {
    return false;
  }
}

export async function api<T = Record<string, unknown>>(
  method: string,
  path: string,
  token?: string,
  body?: unknown,
): Promise<T> {
  const res = await fetch(`${HS}${path}`, {
    method,
    headers: {
      'Content-Type': 'application/json',
      ...(token ? { Authorization: `Bearer ${token}` } : {}),
    },
    body: body === undefined ? undefined : JSON.stringify(body),
  });
  return (await res.json()) as T;
}

export type TestUser = { localpart: string; userId: string; token: string };

/** Registers (open registration) or logs in a test user. */
export async function ensureUser(localpart: string): Promise<TestUser> {
  const reg = await api<{ user_id?: string; access_token?: string }>(
    'POST',
    '/_matrix/client/v3/register',
    undefined,
    { username: localpart, password: PASSWORD, auth: { type: 'm.login.dummy' } },
  );
  if (reg.access_token && reg.user_id) {
    return { localpart, userId: reg.user_id, token: reg.access_token };
  }
  const login = await api<{ user_id: string; access_token: string }>(
    'POST',
    '/_matrix/client/v3/login',
    undefined,
    {
      type: 'm.login.password',
      identifier: { type: 'm.id.user', user: localpart },
      password: PASSWORD,
    },
  );
  return { localpart, userId: login.user_id, token: login.access_token };
}

export async function createRoom(
  owner: TestUser,
  name: string,
  opts: { invite?: string[]; preset?: string } = {},
): Promise<string> {
  const res = await api<{ room_id: string }>('POST', '/_matrix/client/v3/createRoom', owner.token, {
    name,
    preset: opts.preset ?? 'public_chat',
    invite: opts.invite,
  });
  return res.room_id;
}

export async function joinRoom(user: TestUser, roomId: string): Promise<void> {
  await api('POST', `/_matrix/client/v3/rooms/${enc(roomId)}/join`, user.token, {});
}

let txn = 0;
export async function sendText(
  user: TestUser,
  roomId: string,
  body: string,
  extra: Record<string, unknown> = {},
): Promise<string> {
  txn += 1;
  const res = await api<{ event_id: string }>(
    'PUT',
    `/_matrix/client/v3/rooms/${enc(roomId)}/send/m.room.message/e2e${Date.now()}_${txn}`,
    user.token,
    { msgtype: 'm.text', body, ...extra },
  );
  return res.event_id;
}

/** Password login through the UI against the local homeserver. */
export async function loginUI(page: Page, user: TestUser): Promise<void> {
  await page.goto(`/login/${enc(HS)}/`);
  await page.getByLabel('Username or email').fill(user.localpart);
  await page.getByLabel('Password', { exact: true }).fill(PASSWORD);
  await page.getByRole('button', { name: 'Login' }).click();
  await page.waitForURL(/\/home/, { timeout: 60_000 });
}

export async function openRoom(page: Page, roomId: string): Promise<void> {
  await page.goto(`/home/${enc(roomId)}`);
  await expect(page.locator('[data-slate-editor]').first()).toBeVisible({ timeout: 30_000 });
}

export const uniq = (prefix: string): string =>
  `${prefix}${Date.now().toString(36)}${Math.random().toString(36).slice(2, 6)}`;