/**
 * Integration tests for chat, against the live seeded database.
 *
 *   pnpm services:up && pnpm db:migrate && pnpm db:seed
 *   pnpm --filter @linkder/api test
 *
 * A thread is a private conversation between exactly two people, so most of this
 * file is about the third person: a stranger must not be able to read it, write
 * to it, mark it read, or learn that it exists at all.
 *
 * Fixtures are built with SQL rather than by driving `deck.swipe` →
 * `request.accept`. That flow has its own correctness to prove; borrowing it
 * here would mean a change to request expiry could fail the chat tests.
 */
import { config } from 'dotenv';
import { sql } from 'drizzle-orm';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';

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;

function callerFor(session: Session | null) {
  return 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 owner: string;
let pro: string;
let stranger: string;
let jobId: string;
let matchId: string;
/** A second job/thread pair, used for the "closed once the job is" tests. */
let closedJobId: string;
let closedMatchId: 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}, ${`${name.toLowerCase().replace(/\s+/g, '-')}-${RUN}@example.com`}, ${role})
    RETURNING id
  `);
  return row!.id;
}

/** A job owned by `owner`, plus an accepted request and the match it opens. */
async function insertJobWithMatch(categoryId: string, status: string): Promise<{
  jobId: string;
  matchId: string;
}> {
  const [job] = await db.execute<{ id: string }>(sql`
    INSERT INTO jobs (client_id, category_id, title, description, location, address_text, status)
    VALUES (
      ${owner}, ${categoryId}, 'Chat fixture job',
      'A job that exists only so a conversation can hang off it.',
      ST_SetSRID(ST_MakePoint(2.1686, 41.3874), 4326)::geography,
      'Carrer de Prova 1', ${sql.raw(`'${status}'`)}
    )
    RETURNING id
  `);

  const [request] = await db.execute<{ id: string }>(sql`
    INSERT INTO requests (job_id, pro_id, status, expires_at, responded_at)
    VALUES (${job!.id}, ${pro}, 'accepted', now() + interval '2 days', now())
    RETURNING id
  `);

  const [match] = await db.execute<{ id: string }>(sql`
    INSERT INTO matches (request_id, job_id, pro_id, client_id)
    VALUES (${request!.id}, ${job!.id}, ${pro}, ${owner})
    RETURNING id
  `);

  return { jobId: job!.id, matchId: match!.id };
}

beforeAll(async () => {
  const [plumber] = await db.execute<{ id: string }>(
    sql`SELECT id FROM categories WHERE slug = 'plumber' LIMIT 1`,
  );
  if (!plumber) throw new Error('plumber category missing from seed');

  owner = await insertUser(`Chat Owner ${RUN}`, 'client');
  stranger = await insertUser(`Chat Stranger ${RUN}`, 'client');
  pro = await insertUser(`Chat Pro ${RUN}`, 'pro');

  await db.execute(sql`
    INSERT INTO pro_profiles (
      user_id, headline, bio, hourly_rate_cents, base_location, service_radius_m,
      verification_status, verified_at
    )
    VALUES (
      ${pro}, 'Chat fixture pro', 'Exists only for the message router tests.', 4000,
      ST_SetSRID(ST_MakePoint(2.1686, 41.3874), 4326)::geography, 15000, 'verified', now()
    )
  `);

  ({ jobId, matchId } = await insertJobWithMatch(plumber.id, 'matched'));
  ({ jobId: closedJobId, matchId: closedMatchId } = await insertJobWithMatch(
    plumber.id,
    'cancelled',
  ));
});

afterAll(async () => {
  // jobs, requests, matches, messages and pro_profiles all cascade from users.
  await db.execute(sql`DELETE FROM users WHERE id IN (${owner}, ${stranger}, ${pro})`);
  await closePool();
});

describe('message.thread', () => {
  it('gives each side the same conversation, newest last', async () => {
    await callerFor(clientSession(owner)).message.send({
      ref: { matchId },
      body: 'Morning — when could you take a look?',
      attachments: [],
    });
    await callerFor(proSession(pro)).message.send({
      ref: { matchId },
      body: 'Thursday afternoon works.',
      attachments: [],
    });

    const asClient = await callerFor(clientSession(owner)).message.thread({ ref: { matchId } });
    const asPro = await callerFor(proSession(pro)).message.thread({ ref: { matchId } });

    expect(asClient.messages.map((m) => m.body)).toEqual([
      'Morning — when could you take a look?',
      'Thursday afternoon works.',
    ]);
    expect(asPro.messages.map((m) => m.id)).toEqual(asClient.messages.map((m) => m.id));

    // Same rows, opposite ownership.
    expect(asClient.messages.map((m) => m.isMine)).toEqual([true, false]);
    expect(asPro.messages.map((m) => m.isMine)).toEqual([false, true]);
  });

  it('names the peer, not the caller', async () => {
    const asClient = await callerFor(clientSession(owner)).message.thread({ ref: { matchId } });
    const asPro = await callerFor(proSession(pro)).message.thread({ ref: { matchId } });

    expect(asClient.match.peer?.id).toBe(pro);
    expect(asPro.match.peer?.id).toBe(owner);
    expect(asClient.match.jobId).toBe(jobId);
  });

  it('is a 404 to a stranger — never a 403', async () => {
    // A 403 would confirm the conversation exists. Same rule as job.byId.
    await expect(
      callerFor(clientSession(stranger)).message.thread({ ref: { matchId } }),
    ).rejects.toThrow(/not found/i);
  });

  it('refuses an anonymous caller', async () => {
    await expect(callerFor(null).message.thread({ ref: { matchId } })).rejects.toThrow();
  });

  it('pages oldest-ward without dropping or repeating a message', async () => {
    // 30 is the page size; 35 forces a second page with a clear boundary.
    //
    // Inserted directly rather than sent: `message.send` is rate-limited, and
    // tripping the limiter is exactly what a 35-message loop is supposed to do.
    //
    // They land MICROSECONDS apart, inside a single millisecond, on purpose.
    // That is the case a millisecond-precision cursor silently drops — five
    // messages went missing here before the cursor became an id.
    await db.execute(sql`
      INSERT INTO messages (match_id, sender_id, body, created_at)
      SELECT ${matchId}, ${pro}, 'page probe ' || i, now() + (i || ' microseconds')::interval
        FROM generate_series(0, 34) AS i
    `);

    const first = await callerFor(clientSession(owner)).message.thread({ ref: { matchId } });
    expect(first.messages).toHaveLength(30);
    expect(first.nextCursor).not.toBeNull();

    const second = await callerFor(clientSession(owner)).message.thread({
      ref: { matchId },
      cursor: first.nextCursor!,
    });

    const firstIds = new Set(first.messages.map((m) => m.id));
    expect(second.messages.some((m) => firstIds.has(m.id))).toBe(false);

    // Two opening messages + 35 probes, and every one accounted for across the pages.
    expect(second.messages).toHaveLength(7);
    expect(second.nextCursor).toBeNull();

    const [total] = await db.execute<{ n: number }>(
      sql`SELECT count(*)::int AS n FROM messages WHERE match_id = ${matchId}`,
    );
    expect(first.messages.length + second.messages.length).toBe(total!.n);
  });

  it('will not page into a conversation the cursor does not belong to', async () => {
    // A cursor is a message id. One lifted from another thread must not act as
    // a window into it — the anchor subquery is scoped to the match.
    const other = await callerFor(clientSession(owner)).message.thread({
      ref: { matchId: closedMatchId },
    });
    const foreign = (await callerFor(clientSession(owner)).message.thread({ ref: { matchId } })).messages[0];

    const page = await callerFor(clientSession(owner)).message.thread({
      ref: { matchId: closedMatchId },
      cursor: foreign!.id,
    });

    expect(other.messages.length).toBeGreaterThanOrEqual(0);
    expect(page.messages).toHaveLength(0);
  });
});

describe('message.send', () => {
  it('moves lastMessageAt so the jobs list can sort on it', async () => {
    const [before] = await db.execute<{ last_message_at: Date | null }>(
      sql`SELECT last_message_at FROM matches WHERE id = ${matchId}`,
    );

    const sent = await callerFor(clientSession(owner)).message.send({
      ref: { matchId },
      body: 'One more thing.',
      attachments: [],
    });

    const [after] = await db.execute<{ last_message_at: Date | null }>(
      sql`SELECT last_message_at FROM matches WHERE id = ${matchId}`,
    );

    expect(after!.last_message_at).not.toBeNull();
    expect(new Date(after!.last_message_at!).getTime()).toBe(sent.createdAt.getTime());
    if (before!.last_message_at) {
      expect(new Date(after!.last_message_at!).getTime()).toBeGreaterThanOrEqual(
        new Date(before!.last_message_at).getTime(),
      );
    }
  });

  it('rejects a message of nothing but whitespace', async () => {
    await expect(
      callerFor(clientSession(owner)).message.send({ ref: { matchId }, body: '   ', attachments: [] }),
    ).rejects.toThrow();
  });

  it('rejects a message that is neither words nor files', async () => {
    await expect(
      callerFor(clientSession(owner)).message.send({ ref: { matchId }, body: '', attachments: [] }),
    ).rejects.toThrow();
  });

  it('accepts a photo with no caption', async () => {
    // The commonest message on this product is a picture of the broken thing.
    // Requiring words alongside it would make people type "see photo".
    const sent = await callerFor(clientSession(owner)).message.send({
      ref: { matchId },
      body: '',
      attachments: ['https://cdn.example.com/messages/leak.jpg'],
    });

    expect(sent.body).toBe('');
    expect(sent.attachments).toEqual(['https://cdn.example.com/messages/leak.jpg']);
  });

  it('caps attachments at five and requires them to be URLs', async () => {
    const caller = callerFor(clientSession(owner));
    const six = Array.from({ length: 6 }, (_, i) => `https://cdn.example.com/m/${i}.jpg`);

    await expect(caller.message.send({ ref: { matchId }, body: 'here', attachments: six })).rejects.toThrow();
    await expect(
      caller.message.send({ ref: { matchId }, body: 'here', attachments: ['not-a-url'] }),
    ).rejects.toThrow();
  });

  it('rejects a message past the length cap', async () => {
    await expect(
      callerFor(clientSession(owner)).message.send({
        ref: { matchId },
        body: 'x'.repeat(4001),
        attachments: [],
      }),
    ).rejects.toThrow();
  });

  it('refuses a stranger', async () => {
    await expect(
      callerFor(clientSession(stranger)).message.send({
        ref: { matchId },
        body: 'let me in',
        attachments: [],
      }),
    ).rejects.toThrow(/not found/i);
  });

  it('closes the conversation once the job is history', async () => {
    // The thread stays readable — it is the record of what was agreed.
    const thread = await callerFor(clientSession(owner)).message.thread({
      ref: { matchId: closedMatchId },
    });
    expect(thread.match.canReply).toBe(false);

    await expect(
      callerFor(clientSession(owner)).message.send({
        ref: { matchId: closedMatchId },
        body: 'still there?',
        attachments: [],
      }),
    ).rejects.toThrow(/cancelled/i);
  });
});

describe('message.markRead and unreadTotal', () => {
  it('counts only what the other side sent, and clears it once', async () => {
    const { matchId: freshMatch } = await insertJobWithMatch(
      (await db.execute<{ id: string }>(
        sql`SELECT id FROM categories WHERE slug = 'plumber' LIMIT 1`,
      ))[0]!.id,
      'matched',
    );

    const proCaller = callerFor(proSession(pro));
    await proCaller.message.send({ ref: { matchId: freshMatch }, body: 'On my way.', attachments: [] });
    await proCaller.message.send({ ref: { matchId: freshMatch }, body: 'Ten minutes.', attachments: [] });

    // The sender never badges themselves.
    const proUnread = await proCaller.message.unreadTotal();
    const proOwnHere = await proCaller.message.markRead({ ref: { matchId: freshMatch } });
    expect(proOwnHere.read).toBe(0);

    const ownerCaller = callerFor(clientSession(owner));
    const before = await ownerCaller.message.unreadTotal();
    expect(before.unread).toBeGreaterThanOrEqual(2);

    const cleared = await ownerCaller.message.markRead({ ref: { matchId: freshMatch } });
    expect(cleared.read).toBe(2);

    // Idempotent: the partial index predicate is also the WHERE clause.
    const again = await ownerCaller.message.markRead({ ref: { matchId: freshMatch } });
    expect(again.read).toBe(0);

    const after = await ownerCaller.message.unreadTotal();
    expect(after.unread).toBe(before.unread - 2);
    expect(proUnread.unread).toBeGreaterThanOrEqual(0);
  });

  it('refuses to mark a stranger’s thread read', async () => {
    await expect(
      callerFor(clientSession(stranger)).message.markRead({ ref: { matchId } }),
    ).rejects.toThrow(/not found/i);
  });
});

describe('job.matches', () => {
  it('lists the pros who accepted, with their unread counts', async () => {
    const rows = await callerFor(clientSession(owner)).job.matches({ jobId });
    const row = rows.find((r) => r.matchId === matchId);

    expect(row).toBeDefined();
    expect(row!.proId).toBe(pro);
    expect(row!.headline).toBe('Chat fixture pro');
    expect(row!.unreadCount).toBeGreaterThanOrEqual(0);

    // The newest message on this thread is the caption-less photo sent above.
    // The row has to be able to say "Attachment" rather than preview a blank
    // line, which is what the count is for.
    expect(row!.lastMessage).toBe('');
    expect(row!.lastMessageAttachments).toBe(1);
  });

  it('is a 404 for someone else’s job', async () => {
    await expect(
      callerFor(clientSession(stranger)).job.matches({ jobId }),
    ).rejects.toThrow(/not found/i);
  });
});