/**
 * Watching a pro, and asking one a question.
 *
 *   pnpm services:up && pnpm db:migrate && pnpm db:seed
 *
 * The deck's two new answers. Most of what follows is about the cap on
 * enquiries, because this is the first way in the product to reach a pro who
 * has not agreed to anything — until now chat was gated behind
 * message → match → accepted request → job, and that gate is what made a pro's
 * inbox worth opening.
 */
import { config } from 'dotenv';
import { sql } from 'drizzle-orm';
import { afterAll, beforeAll, beforeEach, describe, expect, it } from 'vitest';
import { MAX_OPEN_ENQUIRIES } from '@linkder/shared';

config({ path: '../../.env' });

const { closePool, db } = await import('@linkder/db');
const { appRouter } = await import('../src/root');
const { createInnerContext } = await import('../src/context');
const { createCallerFactory } = await import('../src/trpc');

const createCaller = createCallerFactory(appRouter);
type Session = import('../src/context').Session;

const callerFor = (session: Session | null) =>
  createCaller(createInnerContext({ db, session }));

const clientSession = (userId: string): Session => ({
  userId,
  role: 'client',
  name: 'Test Client',
  email: 'client@test',
  phone: null,
  verificationStatus: null,
});

const proSession = (userId: string): Session => ({
  userId,
  role: 'pro',
  name: 'Test Pro',
  email: 'pro@test',
  phone: null,
  verificationStatus: 'verified',
});

const RUN = Math.random().toString(36).slice(2, 8);

let client: string;
let pros: string[] = [];
let unverifiedPro: string;

async function insertUser(name: string, role: 'client' | 'pro'): Promise<string> {
  const [row] = await db.execute<{ id: string }>(sql`
    INSERT INTO users (name, email, role)
    VALUES (${name}, ${`${RUN}-${Math.random().toString(36).slice(2, 8)}@example.com`}, ${role})
    RETURNING id
  `);
  return row!.id;
}

/**
 * Fixture pros are on holiday (`is_accepting_jobs = false` by default here where
 * it does not matter, true where it does).
 *
 * Test files share one database. A verified, accepting pro at the city centre is
 * eligible for the SEEDED job's deck, so creating and deleting them mid-run
 * shifts `deck.list().remaining` underneath deck.router.test.ts. Parked far
 * outside the city instead, which keeps them off every deck without changing
 * the availability these tests actually assert on.
 */
async function insertPro(name: string, accepting = true, verified = true): Promise<string> {
  const id = await insertUser(name, 'pro');
  await db.execute(sql`
    INSERT INTO pro_profiles (
      user_id, headline, bio, hourly_rate_cents, base_location, base_location_precision,
      service_radius_m, verification_status, verified_at, is_accepting_jobs
    )
    VALUES (
      ${id}, ${`${name} headline`}, 'Exists only for the discovery tests.', 3000,
      ST_SetSRID(ST_MakePoint(-40.0, -40.0), 4326)::geography, 'exact',
      15000, ${verified ? 'verified' : 'pending'}, now(), ${accepting}
    )
  `);
  return id;
}

beforeAll(async () => {
  client = await insertUser(`Discovery Client ${RUN}`, 'client');
  for (let i = 0; i < MAX_OPEN_ENQUIRIES + 2; i += 1) {
    pros.push(await insertPro(`Discovery Pro ${RUN}-${i}`));
  }
  unverifiedPro = await insertPro(`Discovery Unverified ${RUN}`, true, false);
});

beforeEach(async () => {
  await db.execute(sql`DELETE FROM enquiries WHERE client_id = ${client}`);
  await db.execute(sql`DELETE FROM pro_watches WHERE watcher_id = ${client}`);
});

afterAll(async () => {
  // One at a time rather than `= ANY(...)`: drizzle passes a JS array through as
  // a scalar parameter, which Postgres rejects.
  for (const id of [client, unverifiedPro, ...pros]) {
    await db.execute(sql`DELETE FROM users WHERE id = ${id}`);
  }
  await closePool();
});

describe('watch', () => {
  it('toggles on and off with one call', async () => {
    const caller = callerFor(clientSession(client));

    expect((await caller.watch.isWatching({ proId: pros[0]! })).watching).toBe(false);

    const on = await caller.watch.toggle({ proId: pros[0]! });
    expect(on.watching).toBe(true);
    expect((await caller.watch.isWatching({ proId: pros[0]! })).watching).toBe(true);

    const off = await caller.watch.toggle({ proId: pros[0]! });
    expect(off.watching).toBe(false);
    expect((await caller.watch.mine()).map((w) => w.proId)).not.toContain(pros[0]);
  });

  it('refuses an unverified pro, and refuses to watch yourself', async () => {
    const caller = callerFor(clientSession(client));
    await expect(caller.watch.toggle({ proId: unverifiedPro })).rejects.toThrow(/not available/i);
    await expect(caller.watch.toggle({ proId: client })).rejects.toThrow();
  });

  it('does not fire for a pro who was already free when watched', async () => {
    // The trigger is a CHANGE, not a state. Without the snapshot taken at watch
    // time, every sweep would notify every watcher, because "available" stays
    // true for as long as they stay available.
    const caller = callerFor(clientSession(client));
    await caller.watch.toggle({ proId: pros[0]! });

    expect(await caller.watch.dueNotification()).toEqual([]);
  });

  it('fires once a pro who was away comes back', async () => {
    const away = pros[1]!;
    await db.execute(
      sql`UPDATE pro_profiles SET is_accepting_jobs = false WHERE user_id = ${away}`,
    );

    const caller = callerFor(clientSession(client));
    await caller.watch.toggle({ proId: away });
    expect(await caller.watch.dueNotification()).toEqual([]);

    await db.execute(
      sql`UPDATE pro_profiles SET is_accepting_jobs = true WHERE user_id = ${away}`,
    );

    const due = await caller.watch.dueNotification();
    expect(due.map((d) => d.proId)).toContain(away);

    // Told once: marking it notified takes it out of the queue, so a pro
    // toggling twice does not send two messages.
    await db.execute(
      sql`UPDATE pro_watches SET notified_at = now()
           WHERE watcher_id = ${client} AND pro_id = ${away}`,
    );
    expect(await caller.watch.dueNotification()).toEqual([]);
  });
});

describe('enquiry', () => {
  it('creates a thread and its first message together', async () => {
    // An enquiry with no message is an empty room — a pro opening one would
    // find nothing to answer.
    const caller = callerFor(clientSession(client));
    const { enquiryId } = await caller.enquiry.create({
      proId: pros[0]!,
      body: 'Do you cover replacing a whole bathroom suite, or only repairs?',
    });

    const [count] = await db.execute<{ n: number }>(
      sql`SELECT count(*)::int AS n FROM messages WHERE enquiry_id = ${enquiryId}`,
    );
    expect(count!.n).toBe(1);

    const inbox = await callerFor(proSession(pros[0]!)).enquiry.mine();
    expect(inbox.map((e) => e.id)).toContain(enquiryId);
    expect(inbox.find((e) => e.id === enquiryId)!.unreadCount).toBe(1);
  });

  it('puts a second question in the same thread, not a new one', async () => {
    const caller = callerFor(clientSession(client));
    const first = await caller.enquiry.create({
      proId: pros[0]!,
      body: 'Do you cover replacing a whole bathroom suite?',
    });
    const second = await caller.enquiry.create({
      proId: pros[0]!,
      body: 'And would that include taking the old one away with you?',
    });

    // Also what stops the cap being walked around by asking one pro repeatedly.
    expect(second.enquiryId).toBe(first.enquiryId);
  });

  it('caps unanswered enquiries', async () => {
    const caller = callerFor(clientSession(client));

    for (let i = 0; i < MAX_OPEN_ENQUIRIES; i += 1) {
      await caller.enquiry.create({
        proId: pros[i]!,
        body: `Question number ${i} for a pro who has not agreed to anything yet.`,
      });
    }

    expect((await caller.enquiry.allowance()).remaining).toBe(0);

    await expect(
      caller.enquiry.create({
        proId: pros[MAX_OPEN_ENQUIRIES]!,
        body: 'One more question, which should be refused by the open-enquiry cap.',
      }),
    ).rejects.toThrow(/still waiting on an answer/i);
  });

  it('stops counting an enquiry once the pro replies', async () => {
    // Somebody having real conversations should not be throttled; only somebody
    // broadcasting.
    const caller = callerFor(clientSession(client));
    for (let i = 0; i < MAX_OPEN_ENQUIRIES; i += 1) {
      await caller.enquiry.create({
        proId: pros[i]!,
        body: `Question number ${i} for a pro who has not agreed to anything yet.`,
      });
    }
    expect((await caller.enquiry.allowance()).remaining).toBe(0);

    const answered = (await callerFor(proSession(pros[0]!)).enquiry.mine())[0]!;
    await callerFor(proSession(pros[0]!)).message.send({
      ref: { enquiryId: answered.id },
      body: 'Yes, full bathroom suites are fine — happy to quote if you post the job.',
      attachments: [],
    });

    expect((await caller.enquiry.allowance()).remaining).toBe(1);
  });

  it('refuses a pro who is unverified or on holiday', async () => {
    const caller = callerFor(clientSession(client));
    await expect(
      caller.enquiry.create({
        proId: unverifiedPro,
        body: 'Are you able to take on a small job next week at all?',
      }),
    ).rejects.toThrow(/not available/i);
  });

  it('lets the pro close it, after which nothing more can be sent', async () => {
    const caller = callerFor(clientSession(client));
    const { enquiryId } = await caller.enquiry.create({
      proId: pros[0]!,
      body: 'A question that this pro is going to decide not to entertain.',
    });

    // Only the pro. A customer must not be able to close their own way around
    // the cap.
    await expect(caller.enquiry.close({ enquiryId })).rejects.toThrow(/not found/i);

    await callerFor(proSession(pros[0]!)).enquiry.close({ enquiryId });

    await expect(
      caller.message.send({
        ref: { enquiryId },
        body: 'Are you still there? I would really like an answer to this.',
        attachments: [],
      }),
    ).rejects.toThrow(/closed/i);

    // The history stays — a closed thread is still evidence.
    const thread = await caller.message.thread({ ref: { enquiryId } });
    expect(thread.messages.length).toBe(1);
    expect(thread.match.canReply).toBe(false);
  });

  it('is not readable by anyone who is not in it', async () => {
    const caller = callerFor(clientSession(client));
    const { enquiryId } = await caller.enquiry.create({
      proId: pros[0]!,
      body: 'A private question between me and this particular tradesperson.',
    });

    const stranger = await insertUser(`Discovery Stranger ${RUN}`, 'client');
    await expect(
      callerFor(clientSession(stranger)).message.thread({ ref: { enquiryId } }),
    ).rejects.toThrow(/not found/i);
    await db.execute(sql`DELETE FROM users WHERE id = ${stranger}`);
  });
});