/**
 * Integration tests for the deck router, run against the live seeded database.
 *
 *   pnpm services:up && pnpm db:migrate && pnpm db:seed
 *   pnpm --filter @linkdr/api test
 *
 * The point of these is authorization. The swipe path previously lived in a Next
 * server action that trusted whatever jobId it was handed, so anyone could swipe
 * on anyone else's job. Most of what follows exists to prove that is now closed.
 */
import { config } from 'dotenv';
import { sql } from 'drizzle-orm';
import { afterAll, beforeAll, beforeEach, describe, expect, it } from 'vitest';
import { MAX_OPEN_REQUESTS_PER_JOB } from '@linkdr/shared';

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

const { closePool, db } = await import('@linkdr/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,
});

let jobId: string;
let ownerId: string;
let strangerId: string;
let adminId: string;
let verifiedProId: string;
let unverifiedProId: string;

beforeAll(async () => {
  /**
   * The seeded city-centre job, chosen by the properties these tests depend on
   * rather than by being the oldest row.
   *
   * "Oldest" stopped meaning "the fixture" the moment the seed grew backdated
   * jobs for other features, and the TTL assertion below silently started
   * measuring somebody else's `flexible` job.
   */
  const jobs = await db.execute<{ id: string; client_id: string }>(
    sql`SELECT id, client_id FROM jobs
         WHERE urgency = 'now' AND status = 'open'
         ORDER BY created_at LIMIT 1`,
  );
  const job = jobs[0];
  if (!job) throw new Error('No seeded open "now" job — run `pnpm db:seed`');
  jobId = job.id;
  ownerId = job.client_id;

  const others = await db.execute<{ id: string }>(
    // Seeded only — see the note on the job lookup above. A probe client from
    // another test file could otherwise land here and be deleted mid-run.
    sql`SELECT id FROM users
         WHERE role = 'client' AND email LIKE '%@linkder.test' AND id <> ${ownerId}
         LIMIT 1`,
  );
  strangerId = others[0]!.id;

  const admins = await db.execute<{ id: string }>(
    sql`SELECT id FROM users WHERE role = 'admin' LIMIT 1`,
  );
  adminId = admins[0]!.id;

  const verified = await db.execute<{ id: string }>(sql`
    SELECT p.user_id AS id FROM pro_profiles p
    JOIN pro_categories pc ON pc.pro_id = p.user_id
    JOIN jobs j ON j.category_id = pc.category_id AND j.id = ${jobId}
    WHERE p.verification_status = 'verified' AND p.is_accepting_jobs = true
    LIMIT 1
  `);
  verifiedProId = verified[0]!.id;

  const unverified = await db.execute<{ id: string }>(
    sql`SELECT user_id AS id FROM pro_profiles WHERE verification_status <> 'verified' LIMIT 1`,
  );
  unverifiedProId = unverified[0]!.id;
});

beforeEach(async () => {
  await db.execute(sql`DELETE FROM requests WHERE job_id = ${jobId}`);
  await db.execute(sql`DELETE FROM swipes WHERE job_id = ${jobId}`);
  await db.execute(sql`UPDATE jobs SET status = 'open' WHERE id = ${jobId}`);
});

afterAll(async () => {
  await db.execute(sql`DELETE FROM requests WHERE job_id = ${jobId}`);
  await db.execute(sql`DELETE FROM swipes WHERE job_id = ${jobId}`);
  await db.execute(sql`UPDATE jobs SET status = 'open' WHERE id = ${jobId}`);
  await closePool();
});

describe('authorization — the reason this router exists', () => {
  it('refuses an anonymous caller', async () => {
    await expect(callerFor(null).deck.list({ jobId })).rejects.toThrow(/signed in/i);
  });

  it('refuses to show a stranger a deck that is not theirs', async () => {
    await expect(callerFor(clientSession(strangerId)).deck.list({ jobId })).rejects.toThrow(
      /not found/i,
    );
  });

  it('refuses a swipe on a job the caller does not own', async () => {
    await expect(
      callerFor(clientSession(strangerId)).deck.swipe({
        jobId,
        proId: verifiedProId,
        direction: 'right',
      }),
    ).rejects.toThrow(/not found/i);
  });

  it('hides the existence of the job rather than admitting 403', async () => {
    // A stranger must not be able to distinguish "exists but forbidden" from "no such job".
    const real = await callerFor(clientSession(strangerId))
      .deck.list({ jobId })
      .catch((e: Error) => e.message);
    const fake = await callerFor(clientSession(strangerId))
      .deck.list({ jobId: '00000000-0000-4000-8000-000000000000' })
      .catch((e: Error) => e.message);
    expect(real).toBe(fake);
  });

  it('lets the owner through', async () => {
    const result = await callerFor(clientSession(ownerId)).deck.list({ jobId });
    expect(result.cards.length).toBeGreaterThan(0);
  });

  it('lets an admin through', async () => {
    const admin: Session = { ...clientSession(adminId), role: 'admin' };
    const result = await callerFor(admin).deck.list({ jobId });
    expect(result.cards.length).toBeGreaterThan(0);
  });

  it('rejects a pro trying to browse a deck', async () => {
    const proSession: Session = {
      ...clientSession(verifiedProId),
      role: 'pro',
      verificationStatus: 'verified',
    };
    await expect(callerFor(proSession).deck.list({ jobId })).rejects.toThrow(/only clients/i);
  });
});

describe('swipe', () => {
  it('records a left swipe without creating a request', async () => {
    const caller = callerFor(clientSession(ownerId));
    const result = await caller.deck.swipe({
      jobId,
      proId: verifiedProId,
      direction: 'left',
    });
    expect(result.requested).toBe(false);

    const rows = await db.execute<{ n: number }>(
      sql`SELECT count(*)::int AS n FROM requests WHERE job_id = ${jobId}`,
    );
    expect(rows[0]!.n).toBe(0);
  });

  it('creates a pending request on a right swipe', async () => {
    const caller = callerFor(clientSession(ownerId));
    const result = await caller.deck.swipe({
      jobId,
      proId: verifiedProId,
      direction: 'right',
    });
    expect(result.requested).toBe(true);
    // Narrow the discriminated union before reading the right-swipe fields.
    if (!result.requested) throw new Error('expected a request to be created');
    expect(result.requestId).toBeTruthy();
    // The seeded job is urgency 'now', so a 12h TTL.
    expect(result.expiresInHours).toBe(12);
  });

  it('removes the pro from the deck once swiped', async () => {
    const caller = callerFor(clientSession(ownerId));
    const before = await caller.deck.list({ jobId });
    await caller.deck.swipe({ jobId, proId: verifiedProId, direction: 'left' });
    const after = await caller.deck.list({ jobId });

    expect(after.cards.map((c) => c.proId)).not.toContain(verifiedProId);
    expect(after.remaining).toBe(before.remaining - 1);
  });

  it('is idempotent — a double-tap does not create two requests', async () => {
    const caller = callerFor(clientSession(ownerId));
    await caller.deck.swipe({ jobId, proId: verifiedProId, direction: 'right' });
    await caller.deck.swipe({ jobId, proId: verifiedProId, direction: 'right' });

    const rows = await db.execute<{ n: number }>(
      sql`SELECT count(*)::int AS n FROM requests WHERE job_id = ${jobId} AND pro_id = ${verifiedProId}`,
    );
    expect(rows[0]!.n).toBe(1);
  });

  it('refuses to send a job to an unverified pro even if asked directly', async () => {
    await expect(
      callerFor(clientSession(ownerId)).deck.swipe({
        jobId,
        proId: unverifiedProId,
        direction: 'right',
      }),
    ).rejects.toThrow(/not available/i);
  });

  it('enforces the open-request cap', async () => {
    const caller = callerFor(clientSession(ownerId));
    const { cards } = await caller.deck.list({ jobId, limit: 50 });

    let sent = 0;
    let capped = false;
    for (const card of cards) {
      try {
        await caller.deck.swipe({ jobId, proId: card.proId, direction: 'right' });
        sent++;
      } catch (error) {
        expect((error as Error).message).toMatch(/already have/i);
        capped = true;
        break;
      }
    }

    // The seed has 5 eligible plumbers and the cap is 5, so the cap only trips if
    // there are more candidates than the cap. Assert whichever case applies.
    if (capped) {
      expect(sent).toBe(5);
    } else {
      expect(sent).toBeLessThanOrEqual(5);
    }
  });

  it('holds the cap under concurrent swipes', async () => {
    // Regression: counting pending requests and then inserting one is a
    // read-then-write race. Fired in parallel, the unguarded version let more
    // than MAX_OPEN_REQUESTS_PER_JOB through.
    const caller = callerFor(clientSession(ownerId));
    const { cards } = await caller.deck.list({ jobId, limit: 50 });

    const outcomes = await Promise.allSettled(
      cards.map((card) =>
        caller.deck.swipe({ jobId, proId: card.proId, direction: 'right' }),
      ),
    );

    const created = outcomes.filter((o) => o.status === 'fulfilled').length;
    const [row] = await db.execute<{ n: number }>(
      sql`SELECT count(*)::int AS n FROM requests WHERE job_id = ${jobId} AND status = 'pending'`,
    );

    expect(row!.n).toBeLessThanOrEqual(MAX_OPEN_REQUESTS_PER_JOB);
    expect(row!.n).toBe(created);
  });

  it('leaves no swipe tombstone when the cap rejects the request', async () => {
    const caller = callerFor(clientSession(ownerId));
    const { cards } = await caller.deck.list({ jobId, limit: 50 });
    if (cards.length <= MAX_OPEN_REQUESTS_PER_JOB) return; // not enough supply to trip the cap

    for (let i = 0; i < MAX_OPEN_REQUESTS_PER_JOB; i++) {
      await caller.deck.swipe({ jobId, proId: cards[i]!.proId, direction: 'right' });
    }

    const overflow = cards[MAX_OPEN_REQUESTS_PER_JOB]!;
    await expect(
      caller.deck.swipe({ jobId, proId: overflow.proId, direction: 'right' }),
    ).rejects.toThrow(/already have/i);

    // The rejected pro must still be on the deck — nothing was written for them.
    const [tombstone] = await db.execute<{ n: number }>(
      sql`SELECT count(*)::int AS n FROM swipes WHERE job_id = ${jobId} AND pro_id = ${overflow.proId}`,
    );
    expect(tombstone!.n).toBe(0);

    const after = await caller.deck.list({ jobId, limit: 50 });
    expect(after.cards.map((c) => c.proId)).toContain(overflow.proId);
  });

  it('refuses a swipe on a cancelled job', async () => {
    await db.execute(sql`UPDATE jobs SET status = 'cancelled' WHERE id = ${jobId}`);
    await expect(
      callerFor(clientSession(ownerId)).deck.swipe({
        jobId,
        proId: verifiedProId,
        direction: 'right',
      }),
    ).rejects.toThrow(/no longer taking offers/i);
  });

  it('rejects a malformed proId before touching the database', async () => {
    await expect(
      callerFor(clientSession(ownerId)).deck.swipe({
        jobId,
        proId: 'not-a-uuid',
        direction: 'right',
      }),
    ).rejects.toThrow();
  });
});

describe('undo', () => {
  it('puts a passed pro back on the deck', async () => {
    const caller = callerFor(clientSession(ownerId));
    await caller.deck.swipe({ jobId, proId: verifiedProId, direction: 'left' });
    expect((await caller.deck.list({ jobId })).cards.map((c) => c.proId)).not.toContain(
      verifiedProId,
    );

    await caller.deck.undo({ jobId, proId: verifiedProId });
    expect((await caller.deck.list({ jobId })).cards.map((c) => c.proId)).toContain(verifiedProId);
  });

  it('refuses to undo a swipe that already reached the pro', async () => {
    const caller = callerFor(clientSession(ownerId));
    await caller.deck.swipe({ jobId, proId: verifiedProId, direction: 'right' });
    await expect(caller.deck.undo({ jobId, proId: verifiedProId })).rejects.toThrow(
      /already been sent/i,
    );
  });

  it('refuses an undo from a stranger', async () => {
    await expect(
      callerFor(clientSession(strangerId)).deck.undo({ jobId, proId: verifiedProId }),
    ).rejects.toThrow(/not found/i);
  });
});

/**
 * The entry deck has no job in context, so a right swipe there has to ask which
 * job it means. These are the states that question can be in.
 */
describe('deck.sendable', () => {
  it('lists the jobs a pro could be sent, and flags the ones they already have', async () => {
    const caller = callerFor(clientSession(ownerId));

    const before = await caller.deck.sendable({ proId: verifiedProId });
    const target = before.jobs.find((j) => j.id === jobId);
    expect(target).toBeDefined();
    expect(target!.alreadySent).toBe(false);
    expect(target!.atCap).toBe(false);
    expect(before.proAvailable).toBe(true);

    await caller.deck.swipe({ jobId, proId: verifiedProId, direction: 'right' });

    const after = await caller.deck.sendable({ proId: verifiedProId });
    const sent = after.jobs.find((j) => j.id === jobId);
    // The sheet offers "send" only where this is false — without it a second
    // swipe would silently no-op against the unique constraint.
    expect(sent!.alreadySent).toBe(true);
    expect(sent!.requestStatus).toBe('pending');
    expect(sent!.pendingCount).toBe(1);
  });

  it('only ever lists jobs that are still taking offers', async () => {
    const caller = callerFor(clientSession(ownerId));

    await db.execute(sql`UPDATE jobs SET status = 'completed' WHERE id = ${jobId}`);
    const closed = await caller.deck.sendable({ proId: verifiedProId });
    expect(closed.jobs.map((j) => j.id)).not.toContain(jobId);

    await db.execute(sql`UPDATE jobs SET status = 'open' WHERE id = ${jobId}`);
    const open = await caller.deck.sendable({ proId: verifiedProId });
    expect(open.jobs.map((j) => j.id)).toContain(jobId);
  });

  it("never lists somebody else's jobs", async () => {
    const theirs = await callerFor(clientSession(strangerId)).deck.sendable({
      proId: verifiedProId,
    });
    expect(theirs.jobs.map((j) => j.id)).not.toContain(jobId);
  });

  it('reports a pro who cannot be sent anything rather than failing later', async () => {
    const result = await callerFor(clientSession(ownerId)).deck.sendable({
      proId: unverifiedProId,
    });
    // swipe would throw NOT_FOUND for this pro. Knowing up front is what lets
    // the sheet say so instead of opening and then erroring.
    expect(result.proAvailable).toBe(false);
  });

  it('says whether the pro actually works the trade, without hiding the job', async () => {
    const caller = callerFor(clientSession(ownerId));

    // verifiedProId was picked precisely because they cover this job's category.
    const matching = await caller.deck.sendable({ proId: verifiedProId });
    expect(matching.jobs.find((j) => j.id === jobId)!.tradeMatches).toBe(true);

    const [offTrade] = await db.execute<{ id: string }>(sql`
      SELECT p.user_id AS id FROM pro_profiles p
       WHERE p.verification_status = 'verified'
         AND NOT EXISTS (
           SELECT 1 FROM pro_categories pc
            JOIN jobs j ON j.category_id = pc.category_id AND j.id = ${jobId}
            WHERE pc.pro_id = p.user_id
         )
       LIMIT 1
    `);

    if (offTrade) {
      const other = await caller.deck.sendable({ proId: offTrade.id });
      const row = other.jobs.find((j) => j.id === jobId);
      // Flagged, still offered — the client picked this person on purpose.
      expect(row).toBeDefined();
      expect(row!.tradeMatches).toBe(false);
    }
  });

  it('refuses a pro asking who they could hire', async () => {
    const asPro: Session = {
      ...clientSession(verifiedProId),
      role: 'pro',
      verificationStatus: 'verified',
    };
    await expect(callerFor(asPro).deck.sendable({ proId: verifiedProId })).rejects.toThrow(
      /only clients/i,
    );
  });
});

describe('job router', () => {
  it("lists only the caller's own jobs", async () => {
    const mine = await callerFor(clientSession(ownerId)).job.mine();
    // `mine` no longer returns client_id — it is scoped by it in the WHERE
    // clause, so the column would only be a chance for the two to disagree.
    // Ownership is asserted by what the list does and does not contain.
    expect(mine.map((j) => j.id)).toContain(jobId);

    const theirs = await callerFor(clientSession(strangerId)).job.mine();
    expect(theirs.map((j) => j.id)).not.toContain(jobId);
  });

  it('exposes categories publicly', async () => {
    const categories = await callerFor(null).job.categories();
    expect(categories.length).toBeGreaterThan(0);
    expect(categories.map((c) => c.name)).toContain('Plumber');
  });

  it("refuses to fetch someone else's job by id", async () => {
    await expect(callerFor(clientSession(strangerId)).job.byId({ id: jobId })).rejects.toThrow(
      /not found/i,
    );
  });
});