import request from 'supertest';
import app from '../../src/app';
import { pool } from '../../src/db';
import { resetDb, closeDb } from './setup/testDb';
import { resetAlertThrottleForTests } from '../../src/intake/abuseAlert';

const PNG = Buffer.from(
  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==',
  'base64'
);

beforeEach(async () => {
  await resetDb();
  resetAlertThrottleForTests();
});

afterAll(async () => {
  await pool.end();
  await closeDb();
});

async function makeLink(): Promise<string> {
  const res = await request(app)
    .post('/api/admin/upload-links')
    .send({ label: 'ceiling spec', email: 'sarah@example.com' });
  expect(res.status).toBe(201);
  return res.body.token;
}

/** Fills the window with drafts, as though earlier submissions had arrived. */
async function fillWindow(count: number): Promise<void> {
  for (let i = 0; i < count; i++) {
    const { rows } = await pool.query<{ id: number }>(
      `INSERT INTO items (name, status) VALUES ('filler', 'pending') RETURNING id`
    );
    await pool.query(`INSERT INTO item_drafts (item_id) VALUES ($1)`, [rows[0]!.id]);
  }
}

async function setCeiling(value: number): Promise<void> {
  await pool.query(
    `INSERT INTO admin_settings (key, value, updated_at) VALUES ('intake_daily_ceiling', $1, now())
     ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = now()`,
    [String(value)]
  );
}

const submit = (token: string) =>
  request(app).post(`/api/intake/${token}`).attach('images', PNG, 'a.png');

const draftCount = async (): Promise<number> =>
  (await pool.query<{ c: number }>(`SELECT count(*)::int AS c FROM item_drafts`)).rows[0]?.c ?? 0;

describe('the submission ceiling', () => {
  it('accepts a submission below the ceiling', async () => {
    await setCeiling(5);
    const token = await makeLink();

    expect((await submit(token)).status).toBe(201);
  });

  it('refuses with 503 once the ceiling is reached', async () => {
    await setCeiling(2);
    await fillWindow(2);
    const token = await makeLink();

    const res = await submit(token);

    expect(res.status).toBe(503);
    expect(res.body.error).toMatch(/later/i);
  });

  // Nothing the sender did is wrong and the condition clears by itself, so this
  // must not read as a rejection of them or of their link.
  it('leaves the link usable, so it works again when there is room', async () => {
    await setCeiling(1);
    await fillWindow(1);
    const token = await makeLink();
    expect((await submit(token)).status).toBe(503);

    await setCeiling(50);

    expect((await submit(token)).status).toBe(201);
  });

  // A refused submission must write nothing. The check is ordered ahead of
  // uploadImages for the same reason requireUsableLink is.
  it('stores no item when it refuses', async () => {
    await setCeiling(1);
    await fillWindow(1);
    const token = await makeLink();

    await submit(token);

    expect(await draftCount()).toBe(1);
  });

  /**
   * The constraint that matters most. Intake being throttled is an
   * inconvenience; the shop being unable to add its own stock is an outage.
   */
  it('never applies to the admin upload path', async () => {
    await setCeiling(1);
    await fillWindow(5);

    const res = await request(app)
      .post('/api/admin/items')
      .field('name', 'admin adds stock')
      .field('price', '42.00')
      .attach('images', PNG, 'a.png');

    // 200, not 201 — this route answers with the created item rather than a
    // bare created status, unlike the intake route.
    expect(res.status).toBe(200);
  });

  it('accepts again after the window is reset', async () => {
    await setCeiling(1);
    await fillWindow(1);
    const token = await makeLink();
    expect((await submit(token)).status).toBe(503);

    const reset = await request(app).post('/api/admin/upload-links/reset-ceiling');
    expect(reset.status).toBe(200);

    expect((await submit(token)).status).toBe(201);
  });

  // A reset forgives; it does not erase. Those submissions are real and their
  // items are in the review queue.
  it('keeps the submissions it counted after a reset', async () => {
    await fillWindow(3);

    await request(app).post('/api/admin/upload-links/reset-ceiling');

    expect(await draftCount()).toBe(3);
  });

  // reset-ceiling is declared above /:id/revoke, so Express must not read it as
  // an id and try to revoke a link called "reset-ceiling".
  it('does not collide with the revoke route', async () => {
    const res = await request(app).post('/api/admin/upload-links/reset-ceiling');
    expect(res.body).toEqual({ reset: true });
  });
});