import request from 'supertest';
import { promises as fs } from 'fs';
import app from '../../src/app';
import { pool } from '../../src/db';
import { resetDb, closeDb } from './setup/testDb';

const UPLOADS_DIR = process.env.UPLOADS_DIR as string;

// The same 1x1 PNG the upload validation suite uses, so the accepted case
// exercises the whole path rather than a buffer that merely starts right.
const PNG = Buffer.from(
  'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==',
  'base64'
);

// multer.diskStorage does not create its destination.
beforeAll(async () => {
  await fs.mkdir(UPLOADS_DIR, { recursive: true });
});

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

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

async function storedFiles(): Promise<string[]> {
  return fs.readdir(UPLOADS_DIR);
}

async function issueLink(label = 'Sarah', maxSubmissions?: number | null): Promise<string> {
  const res = await request(app)
    .post('/api/admin/upload-links')
    .send({ label, email: 'sarah@example.com', ...(maxSubmissions === undefined ? {} : { maxSubmissions }) });
  expect(res.status).toBe(201);
  return res.body.token as string;
}

/** A submission with optional extra multipart fields beside the photo. */
function postPhoto(token: string, fields: Record<string, string> = {}) {
  const req = request(app).post(`/api/intake/${token}`);
  for (const [name, value] of Object.entries(fields)) void req.field(name, value);
  return req.attach('images', PNG, 'a.png');
}

describe('checking a link before showing the form', () => {
  it('names the link so the page can greet the sender', async () => {
    const token = await issueLink('Sarah');
    const res = await request(app).get(`/api/intake/${token}`);

    expect(res.status).toBe(200);
    expect(res.body.label).toBe('Sarah');
  });

  // 404 rather than 403 throughout: whether a link exists is not something a
  // stranger needs to be able to distinguish. Same reasoning as uploads.ts.
  it('404s an unknown token', async () => {
    const res = await request(app).get('/api/intake/not-a-real-token');
    expect(res.status).toBe(404);
  });

  it('404s a revoked link', async () => {
    const token = await issueLink();
    const { rows } = await pool.query<{ id: number }>(`SELECT id FROM upload_links`);
    await request(app).post(`/api/admin/upload-links/${rows[0]?.id}/revoke`);

    const res = await request(app).get(`/api/intake/${token}`);
    expect(res.status).toBe(404);
  });
});

describe('submitting an item', () => {
  it('creates a pending item with its images, note and provenance', async () => {
    const token = await issueLink('Sarah');

    const res = await request(app)
      .post(`/api/intake/${token}`)
      .field('note', 'Hand-thrown stoneware, chip on the base')
      .attach('images', PNG, 'front.png')
      .attach('images', PNG, 'back.png');

    expect(res.status).toBe(201);
    expect(res.body.ok).toBe(true);

    const { rows: items } = await pool.query<{ id: number; status: string; price_cents: number }>(
      `SELECT id, status, price_cents FROM items`
    );
    expect(items).toHaveLength(1);
    expect(items[0]?.status).toBe('pending');
    // The migration's default, not a price anyone chose.
    expect(items[0]?.price_cents).toBe(8000);

    const { rows: images } = await pool.query<{ image_path: string }>(
      `SELECT image_path FROM item_images WHERE item_id = $1 ORDER BY sort_order`,
      [items[0]?.id]
    );
    expect(images).toHaveLength(2);
    expect(images[0]?.image_path).toMatch(/^\/uploads\/[a-f0-9-]+\.png$/);

    const { rows: drafts } = await pool.query(
      `SELECT submitter_note, state, price_source, upload_link_id
       FROM item_drafts WHERE item_id = $1`,
      [items[0]?.id]
    );
    expect(drafts[0]?.submitter_note).toBe('Hand-thrown stoneware, chip on the base');
    expect(drafts[0]?.state).toBe('queued');
    expect(drafts[0]?.price_source).toBe('default');
    expect(drafts[0]?.upload_link_id).not.toBeNull();
  });

  it('counts the submission against the link', async () => {
    const token = await issueLink();
    await request(app).post(`/api/intake/${token}`).attach('images', PNG, 'a.png');

    const { rows } = await pool.query<{ submission_count: number; last_used_at: string | null }>(
      `SELECT submission_count, last_used_at FROM upload_links`
    );
    expect(rows[0]?.submission_count).toBe(1);
    expect(rows[0]?.last_used_at).not.toBeNull();
  });

  it('refuses a submission with no photos', async () => {
    const token = await issueLink();
    const res = await request(app).post(`/api/intake/${token}`).field('note', 'nothing attached');

    expect(res.status).toBe(400);
    const { rows } = await pool.query(`SELECT id FROM items`);
    expect(rows).toHaveLength(0);
  });

  // The file is named .png and declared image/png, but the bytes are not.
  // This is the check that cannot happen before the write.
  it('refuses a file whose bytes disagree with its type', async () => {
    const token = await issueLink();
    const res = await request(app)
      .post(`/api/intake/${token}`)
      .attach('images', Buffer.from('<html>not an image</html>'), {
        filename: 'evil.png',
        contentType: 'image/png'
      });

    expect(res.status).toBe(400);
    const { rows } = await pool.query(`SELECT id FROM items`);
    expect(rows).toHaveLength(0);
  });

  it('404s a revoked link without creating anything', async () => {
    const token = await issueLink();
    const { rows: links } = await pool.query<{ id: number }>(`SELECT id FROM upload_links`);
    await request(app).post(`/api/admin/upload-links/${links[0]?.id}/revoke`);

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

    expect(res.status).toBe(404);
    const { rows } = await pool.query(`SELECT id FROM items`);
    expect(rows).toHaveLength(0);
  });

  // The reason requireUsableLink is ordered ahead of uploadImages. Without that
  // ordering this still returns 404 and still creates no item — the bytes just
  // reach the disk first and are deleted afterwards. This asserts they never
  // arrive, so a future reordering fails here rather than quietly handing an
  // unauthenticated caller control of disk churn.
  it('writes nothing to the uploads volume for a token that does not work', async () => {
    const before = await storedFiles();

    const res = await request(app)
      .post('/api/intake/not-a-real-token')
      .attach('images', PNG, 'a.png');

    expect(res.status).toBe(404);
    expect(await storedFiles()).toEqual(before);
  });

  it('stops accepting once the link hits its cap', async () => {
    const token = await issueLink('One shot', 1);

    const first = await request(app).post(`/api/intake/${token}`).attach('images', PNG, 'a.png');
    expect(first.status).toBe(201);

    const second = await request(app).post(`/api/intake/${token}`).attach('images', PNG, 'b.png');
    expect(second.status).toBe(404);

    const { rows } = await pool.query(`SELECT id FROM items`);
    expect(rows).toHaveLength(1);
  });

  // #226 applies here too, and this route is exactly where it matters most:
  // the photo comes from a stranger's phone rather than the shop's own camera.
  it('strips metadata from a submitted photo', async () => {
    const token = await issueLink();
    await request(app).post(`/api/intake/${token}`).attach('images', PNG, 'a.png');

    const { rows } = await pool.query<{ image_path: string }>(`SELECT image_path FROM item_images`);
    const sharp = (await import('sharp')).default;
    const stored = await sharp(
      `${UPLOADS_DIR}/${rows[0]?.image_path.replace('/uploads/', '')}`
    ).metadata();

    expect(stored.exif).toBeUndefined();
  });
});

describe('a submitted item does not reach the storefront', () => {
  it('is absent from the public catalogue', async () => {
    const token = await issueLink();
    await request(app).post(`/api/intake/${token}`).attach('images', PNG, 'a.png');

    const res = await request(app).get('/api/items');
    expect(res.status).toBe(200);
    expect(res.body).toHaveLength(0);
  });
});

describe('the background-removal intent', () => {
  // Ticked by default on the page, so absent means yes. An older client or a
  // curl call then behaves like the current default rather than silently
  // opting out of something every other submission gets.
  it('defaults to true when the field is not sent', async () => {
    const token = await issueLink();
    await postPhoto(token);

    const { rows } = await pool.query<{ remove_background: boolean }>(
      `SELECT remove_background FROM item_drafts ORDER BY id DESC LIMIT 1`
    );
    expect(rows[0]?.remove_background).toBe(true);
  });

  it('records a submitter who unticked it', async () => {
    const token = await issueLink();
    await postPhoto(token, { removeBackground: 'false' });

    const { rows } = await pool.query<{ remove_background: boolean }>(
      `SELECT remove_background FROM item_drafts ORDER BY id DESC LIMIT 1`
    );
    expect(rows[0]?.remove_background).toBe(false);
  });

  // Only the exact string opts out. A stray value is not a considered "no",
  // and reading it as one would quietly deny somebody something they asked for.
  it('treats anything other than "false" as consent', async () => {
    const token = await issueLink();
    await postPhoto(token, { removeBackground: 'no' });

    const { rows } = await pool.query<{ remove_background: boolean }>(
      `SELECT remove_background FROM item_drafts ORDER BY id DESC LIMIT 1`
    );
    expect(rows[0]?.remove_background).toBe(true);
  });
});

describe('what the submission page is told', () => {
  it('says the feature is off when there is no sidecar', async () => {
    delete process.env.REMBG_URL;
    const token = await issueLink();

    const res = await request(app).get(`/api/intake/${token}`);

    expect(res.status).toBe(200);
    expect(res.body.backgroundRemoval).toBe(false);
  });

  it('says it is on when there is one', async () => {
    process.env.REMBG_URL = 'http://rembg-syn:7000';
    const token = await issueLink();

    const res = await request(app).get(`/api/intake/${token}`);

    expect(res.body.backgroundRemoval).toBe(true);
    delete process.env.REMBG_URL;
  });
});