/**
 * Unit tests for the DI-discovered DaysMcp: the update_day and reorder_days
 * tools, create_day's mid-trip insert and dated append, and the trek://trips/{tripId}/days
 * resource (moved from resources.test.ts when the legacy registrar was ported).
 * create_day's plain append is covered in tools-days-accommodations.test.ts.
 */
import { db as testDb } from '../../../src/db/database';
import { DayAssignments } from '../../../src/db/entities/DayAssignments.entity';
import { Days } from '../../../src/db/entities/Days.entity';
import { Trips } from '../../../src/db/entities/Trips.entity';
import { DaysService } from '../../../src/nest/days/days.service';
import {
  createUser,
  createTrip,
  createDay,
  createPlace,
  createDayAssignment,
  createDayAccommodation,
} from '../../helpers/factories';
import { findRow, updateRows } from '../../helpers/factories/rows';
import { readTripDays } from '../../helpers/factories/trips';
import { FakeRealtimeService } from '../../helpers/fake-realtime';
import { createMcpHarness, parseToolResult, parseResourceResult, type McpHarness } from '../../helpers/mcp-harness';
import { resetTestDb } from '../../helpers/test-db';
import { createTestOrm, type TestOrm } from '../../helpers/test-orm';

import { describe, it, expect, vi, beforeAll, beforeEach, afterAll } from 'vitest';

vi.mock('../../../src/db/database', async () => {
  const { createSnapshotTestDb, buildDbMock } = await import('../../helpers/db-mock');
  return buildDbMock(createSnapshotTestDb());
});

const realtime = new FakeRealtimeService();
const broadcastMock = realtime.broadcastMock;

beforeEach(() => {
  resetTestDb(testDb);
  broadcastMock.mockClear();
  delete process.env.DEMO_MODE;
});

let orm: TestOrm;

beforeAll(async () => {
  orm = await createTestOrm(testDb);
});

afterAll(async () => {
  await orm.close();
  testDb.close();
});

async function withHarness(userId: number, fn: (h: McpHarness) => Promise<void>) {
  const h = await createMcpHarness({ realtime, userId, withResources: false });
  try {
    await fn(h);
  } finally {
    await h.cleanup();
  }
}

/** The stored day row, which is what a tool's echo can disagree with. */
async function dayRow(dayId: number) {
  const row = await findRow(orm, Days, { id: dayId });
  if (!row) throw new Error(`no day ${dayId}`);
  return row;
}

/** Day ids of a trip in stored order, so a reorder can be read back positionally. */
async function dayIdsInOrder(tripId: number): Promise<number[]> {
  return (await readTripDays(orm, tripId)).map((r) => r.id);
}

async function dayDatesInOrder(tripId: number): Promise<(string | null)[]> {
  return (await readTripDays(orm, tripId)).map((r) => r.date ?? null);
}

// ---------------------------------------------------------------------------
// update_day
// ---------------------------------------------------------------------------

describe('Tool: update_day', () => {
  it('sets a day title', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const day = createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip.id, dayId: day.id, title: 'Arrival in Paris' },
      });
      const data = parseToolResult(result) as any;
      expect(data.day.title).toBe('Arrival in Paris');
    });
  });

  it('clears a day title with null', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const day = createDay(testDb, trip.id, { title: 'Old Title' });

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip.id, dayId: day.id, title: null },
      });
      const data = parseToolResult(result) as any;
      expect(data.day.title).toBeNull();
    });
  });

  it('setting a title preserves the day notes (post-port defect fix)', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const day = createDay(testDb, trip.id);
    await updateRows(orm, Days, { id: day.id }, { notes: 'Walking day' });

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip.id, dayId: day.id, title: 'Arrival' },
      });
      const data = parseToolResult(result) as { day: { title: string; notes: string } };
      expect(data.day).toMatchObject({ title: 'Arrival', notes: 'Walking day' });
    });
  });

  it('writes notes without being sent a title, and keeps the title', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const day = createDay(testDb, trip.id, { title: 'Arrival in Paris' });

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip.id, dayId: day.id, notes: 'Ferry leaves at 08:00' },
      });
      const data = parseToolResult(result) as { day: { notes: string } };
      expect(data.day.notes).toBe('Ferry leaves at 08:00');
    });

    expect(await dayRow(day.id)).toMatchObject({ title: 'Arrival in Paris', notes: 'Ferry leaves at 08:00' });
  });

  it('sets a title and notes in one call', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const day = createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip.id, dayId: day.id, title: 'Free day', notes: 'Nothing booked' },
      });
    });

    expect(await dayRow(day.id)).toMatchObject({ title: 'Free day', notes: 'Nothing booked' });
  });

  it('clears the notes with an empty string', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const day = createDay(testDb, trip.id, { title: 'Arrival' });
    await updateRows(orm, Days, { id: day.id }, { notes: 'Ferry leaves at 08:00' });

    await withHarness(user.id, async (h) => {
      await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip.id, dayId: day.id, notes: '' },
      });
    });

    expect(await dayRow(day.id)).toMatchObject({ title: 'Arrival', notes: null });
  });

  it('refuses a non-string notes value', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const day = createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip.id, dayId: day.id, notes: 42 },
      });
      expect(result.isError).toBe(true);
      expect((result.content as { text: string }[])[0].text).toContain('Invalid arguments');
    });

    expect((await dayRow(day.id)).notes).toBeNull();
  });

  it('broadcasts day:updated event', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const day = createDay(testDb, trip.id);
    await withHarness(user.id, async (h) => {
      await h.client.callTool({ name: 'update_day', arguments: { tripId: trip.id, dayId: day.id, title: 'Day 1' } });
      expect(broadcastMock).toHaveBeenCalledWith(trip.id, 'day:updated', expect.any(Object));
    });
  });

  it('returns error when day does not belong to trip', async () => {
    const { user } = createUser(testDb);
    const trip1 = createTrip(testDb, user.id);
    const trip2 = createTrip(testDb, user.id);
    const dayFromTrip2 = createDay(testDb, trip2.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip1.id, dayId: dayFromTrip2.id, title: 'X' },
      });
      expect(result.isError).toBe(true);
    });
  });

  it('returns access denied for non-member', async () => {
    const { user } = createUser(testDb);
    const { user: other } = createUser(testDb);
    const trip = createTrip(testDb, other.id);
    const day = createDay(testDb, trip.id);
    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip.id, dayId: day.id, title: 'X' },
      });
      expect(result.isError).toBe(true);
    });
  });

  it('blocks demo user', async () => {
    process.env.DEMO_MODE = 'true';
    const { user } = createUser(testDb, { email: 'demo@nomad.app' });
    const trip = createTrip(testDb, user.id);
    const day = createDay(testDb, trip.id);
    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'update_day',
        arguments: { tripId: trip.id, dayId: day.id, title: 'X' },
      });
      expect(result.isError).toBe(true);
    });
  });
});

// ---------------------------------------------------------------------------
// create_day with a position (the mid-trip insert behind POST /days)
// ---------------------------------------------------------------------------

describe('Tool: create_day (position)', () => {
  it('inserts an empty day into the middle of a dateless trip', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const d1 = createDay(testDb, trip.id);
    const d2 = createDay(testDb, trip.id);
    const d3 = createDay(testDb, trip.id);

    let insertedId = 0;
    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'create_day',
        arguments: { tripId: trip.id, position: 2 },
      });
      insertedId = (parseToolResult(result) as { day: { id: number } }).day.id;
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d1.id, insertedId, d2.id, d3.id]);
    expect(await dayRow(insertedId)).toMatchObject({ day_number: 2, date: null });
  });

  it('re-pins the dates and extends the trip when inserting into a dated trip', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id, { start_date: '2025-06-01', end_date: '2025-06-03' });
    const [d1, d2, d3] = await dayIdsInOrder(trip.id);

    let insertedId = 0;
    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'create_day',
        // date and notes are ignored next to a position, exactly as on REST.
        arguments: { tripId: trip.id, position: 2, date: '2030-01-01', notes: 'ignored' },
      });
      insertedId = (parseToolResult(result) as { day: { id: number } }).day.id;
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d1, insertedId, d2, d3]);
    expect(await dayDatesInOrder(trip.id)).toEqual(['2025-06-01', '2025-06-02', '2025-06-03', '2025-06-04']);
    expect(await dayRow(insertedId)).toMatchObject({ date: '2025-06-02', notes: null });
    expect((await findRow(orm, Trips, { id: trip.id }))?.end_date).toBe('2025-06-04');
  });

  it('appends when position is omitted and still honours date and notes', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const d1 = createDay(testDb, trip.id);

    let appendedId = 0;
    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'create_day',
        arguments: { tripId: trip.id, date: '2025-06-15', notes: 'Arrival day' },
      });
      appendedId = (parseToolResult(result) as { day: { id: number } }).day.id;
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d1.id, appendedId]);
    expect(await dayRow(appendedId)).toMatchObject({ date: '2025-06-15', notes: 'Arrival day' });
  });

  it('broadcasts day:reordered for an insert and day:created for an append', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      await h.client.callTool({ name: 'create_day', arguments: { tripId: trip.id, position: 1 } });
      expect(broadcastMock).toHaveBeenCalledWith(trip.id, 'day:reordered', expect.any(Object));
      expect(broadcastMock).not.toHaveBeenCalledWith(trip.id, 'day:created', expect.any(Object));

      broadcastMock.mockClear();
      await h.client.callTool({ name: 'create_day', arguments: { tripId: trip.id } });
      expect(broadcastMock).toHaveBeenCalledWith(trip.id, 'day:created', expect.any(Object));
    });
  });

  it('refuses a position below 1', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'create_day',
        arguments: { tripId: trip.id, position: 0 },
      });
      expect(result.isError).toBe(true);
      expect((result.content as { text: string }[])[0].text).toContain('Invalid arguments');
    });

    expect(await dayIdsInOrder(trip.id)).toHaveLength(1);
  });

  it('refuses an insert that would invert a stay, leaving the trip untouched', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id, { start_date: '2025-06-01', end_date: '2025-06-03' });
    const [d1, d2, d3] = await dayIdsInOrder(trip.id);
    const place = createPlace(testDb, trip.id);
    // The stay ends on the last day, so pushing a day in front of its start
    // cannot invert it; anchoring it the other way round is what does.
    createDayAccommodation(testDb, trip.id, place.id, d3, d1);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'create_day',
        arguments: { tripId: trip.id, position: 2 },
      });
      expect(result.isError).toBe(true);
      expect((result.content as { text: string }[])[0].text).toContain('accommodation');
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d1, d2, d3]);
    expect(await dayDatesInOrder(trip.id)).toEqual(['2025-06-01', '2025-06-02', '2025-06-03']);
  });

  it('blocks demo user on an insert', async () => {
    process.env.DEMO_MODE = 'true';
    const { user } = createUser(testDb, { email: 'demo@nomad.app' });
    const trip = createTrip(testDb, user.id);
    createDay(testDb, trip.id);
    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({ name: 'create_day', arguments: { tripId: trip.id, position: 1 } });
      expect(result.isError).toBe(true);
    });
    expect(await dayIdsInOrder(trip.id)).toHaveLength(1);
  });
});

// ---------------------------------------------------------------------------
// create_day (dated)
// ---------------------------------------------------------------------------

describe('Tool: create_day (dated)', () => {
  const endDate = async (tripId: number) => (await findRow(orm, Trips, { id: tripId }))?.end_date;

  it('appends the next date behind the dated days, extends the trip and answers with both', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id, { start_date: '2025-06-01', end_date: '2025-06-02' });
    const [d1, d2] = await dayIdsInOrder(trip.id);
    const spare = createDay(testDb, trip.id);

    let data = {} as {
      day: { id: number; date: string; notes: string | null };
      trip: { end_date: string; day_count: number };
    };
    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'create_day',
        arguments: { tripId: trip.id, dated: true, notes: 'Late checkout' },
      });
      data = parseToolResult(result) as typeof data;
    });

    expect(data.day).toMatchObject({ date: '2025-06-03', notes: 'Late checkout' });
    expect(data.trip).toMatchObject({ end_date: '2025-06-03', day_count: 4 });
    expect(await dayIdsInOrder(trip.id)).toEqual([d1, d2, data.day.id, spare.id]);
    expect(await dayDatesInOrder(trip.id)).toEqual(['2025-06-01', '2025-06-02', '2025-06-03', null]);
    expect(await endDate(trip.id)).toBe('2025-06-03');
    // The insert shape of day:reordered, so collaborators refetch, then the trip.
    expect(broadcastMock).toHaveBeenCalledWith(
      trip.id,
      'day:reordered',
      expect.objectContaining({ day: expect.objectContaining({ id: data.day.id }) }),
    );
    expect(broadcastMock).toHaveBeenCalledWith(
      trip.id,
      'trip:updated',
      expect.objectContaining({ trip: expect.objectContaining({ end_date: '2025-06-03' }) }),
    );
    expect(broadcastMock).not.toHaveBeenCalledWith(trip.id, 'day:created', expect.any(Object));
  });

  it('refuses dated next to a position or a date, the way the REST contract does', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id, { start_date: '2025-06-01', end_date: '2025-06-02' });

    await withHarness(user.id, async (h) => {
      for (const extra of [{ position: 1 }, { date: '2025-07-01' }]) {
        const result = await h.client.callTool({
          name: 'create_day',
          arguments: { tripId: trip.id, dated: true, ...extra },
        });
        expect(result.isError).toBe(true);
        expect((result.content as { text: string }[])[0].text).toContain(
          'dated cannot be combined with date or position',
        );
      }
    });

    expect(await dayIdsInOrder(trip.id)).toHaveLength(2);
    expect(await endDate(trip.id)).toBe('2025-06-02');
    expect(broadcastMock).not.toHaveBeenCalled();
  });

  it('refuses a trip without dates and writes nothing', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({ name: 'create_day', arguments: { tripId: trip.id, dated: true } });
      expect(result.isError).toBe(true);
      expect((result.content as { text: string }[])[0].text).toContain('This trip has no dates');
    });

    expect(await dayDatesInOrder(trip.id)).toEqual([null]);
    expect(broadcastMock).not.toHaveBeenCalled();
  });

  it('lets an unexpected failure surface as one, not as a refusal of the trip', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id, { start_date: '2025-06-01', end_date: '2025-06-02' });
    const boom = vi.spyOn(DaysService.prototype, 'appendDated').mockImplementation(() => {
      throw new Error('disk full');
    });
    try {
      await withHarness(user.id, async (h) => {
        const result = await h.client.callTool({ name: 'create_day', arguments: { tripId: trip.id, dated: true } });
        expect(result.isError).toBe(true);
        expect(JSON.stringify(result.content)).not.toContain('This trip has no dates');
      });
    } finally {
      boom.mockRestore();
    }
    expect(broadcastMock).not.toHaveBeenCalled();
  });

  it('blocks a demo user', async () => {
    process.env.DEMO_MODE = 'true';
    const { user } = createUser(testDb, { email: 'demo@nomad.app' });
    const trip = createTrip(testDb, user.id, { start_date: '2025-06-01', end_date: '2025-06-02' });

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({ name: 'create_day', arguments: { tripId: trip.id, dated: true } });
      expect(result.isError).toBe(true);
    });

    expect(await dayIdsInOrder(trip.id)).toHaveLength(2);
    expect(await endDate(trip.id)).toBe('2025-06-02');
  });

  it('an insert at a position announces the grown trip as well', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id, { start_date: '2025-06-01', end_date: '2025-06-02' });

    await withHarness(user.id, async (h) => {
      await h.client.callTool({ name: 'create_day', arguments: { tripId: trip.id, position: 1 } });
    });

    expect(broadcastMock).toHaveBeenCalledWith(
      trip.id,
      'trip:updated',
      expect.objectContaining({ trip: expect.objectContaining({ end_date: '2025-06-03', day_count: 3 }) }),
    );
  });
});

// ---------------------------------------------------------------------------
// reorder_days
// ---------------------------------------------------------------------------

describe('Tool: reorder_days', () => {
  it('renumbers the days and carries each day content along', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const d1 = createDay(testDb, trip.id, { title: 'First' });
    const d2 = createDay(testDb, trip.id, { title: 'Second' });
    const d3 = createDay(testDb, trip.id, { title: 'Third' });
    const place = createPlace(testDb, trip.id);
    const assignment = createDayAssignment(testDb, d3.id, place.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'reorder_days',
        arguments: { tripId: trip.id, orderedIds: [d3.id, d1.id, d2.id] },
      });
      expect(parseToolResult(result)).toEqual({ success: true });
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d3.id, d1.id, d2.id]);
    expect(await dayRow(d3.id)).toMatchObject({ day_number: 1, title: 'Third' });
    expect((await findRow(orm, DayAssignments, { id: assignment.id }))?.day_id).toBe(d3.id);
  });

  it('keeps the dates pinned to their slots so the content moves across them', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id, { start_date: '2025-06-01', end_date: '2025-06-03' });
    const [d1, d2, d3] = await dayIdsInOrder(trip.id);

    await withHarness(user.id, async (h) => {
      await h.client.callTool({
        name: 'reorder_days',
        arguments: { tripId: trip.id, orderedIds: [d3, d1, d2] },
      });
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d3, d1, d2]);
    expect(await dayDatesInOrder(trip.id)).toEqual(['2025-06-01', '2025-06-02', '2025-06-03']);
    expect((await dayRow(d3)).date).toBe('2025-06-01');
  });

  it('broadcasts day:reordered with the ordered ids', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const d1 = createDay(testDb, trip.id);
    const d2 = createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      await h.client.callTool({ name: 'reorder_days', arguments: { tripId: trip.id, orderedIds: [d2.id, d1.id] } });
    });

    expect(broadcastMock).toHaveBeenCalledWith(
      trip.id,
      'day:reordered',
      expect.objectContaining({ orderedIds: [d2.id, d1.id] }),
    );
  });

  it('refuses a list that is not a permutation of the trip days', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const d1 = createDay(testDb, trip.id);
    const d2 = createDay(testDb, trip.id);
    const d3 = createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'reorder_days',
        arguments: { tripId: trip.id, orderedIds: [d2.id, d1.id] },
      });
      expect(result.isError).toBe(true);
      expect((result.content as { text: string }[])[0].text).toContain('permutation');
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d1.id, d2.id, d3.id]);
    expect(broadcastMock).not.toHaveBeenCalled();
  });

  it('refuses a day id from another trip', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const other = createTrip(testDb, user.id);
    const d1 = createDay(testDb, trip.id);
    const d2 = createDay(testDb, trip.id);
    const foreign = createDay(testDb, other.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'reorder_days',
        arguments: { tripId: trip.id, orderedIds: [d1.id, foreign.id] },
      });
      expect(result.isError).toBe(true);
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d1.id, d2.id]);
    expect((await dayRow(foreign.id)).day_number).toBe(1);
  });

  it('refuses a move that would make a stay end before it starts, and rolls back', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id, { start_date: '2025-06-01', end_date: '2025-06-03' });
    const [d1, d2, d3] = await dayIdsInOrder(trip.id);
    const place = createPlace(testDb, trip.id);
    createDayAccommodation(testDb, trip.id, place.id, d1, d2);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'reorder_days',
        arguments: { tripId: trip.id, orderedIds: [d2, d1, d3] },
      });
      expect(result.isError).toBe(true);
      expect((result.content as { text: string }[])[0].text).toContain('accommodation');
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d1, d2, d3]);
    expect(broadcastMock).not.toHaveBeenCalled();
  });

  it('refuses an empty list', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'reorder_days',
        arguments: { tripId: trip.id, orderedIds: [] },
      });
      expect(result.isError).toBe(true);
      expect((result.content as { text: string }[])[0].text).toContain('Invalid arguments');
    });
  });

  it('returns access denied for non-member', async () => {
    const { user } = createUser(testDb);
    const { user: other } = createUser(testDb);
    const trip = createTrip(testDb, other.id);
    const d1 = createDay(testDb, trip.id);
    const d2 = createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'reorder_days',
        arguments: { tripId: trip.id, orderedIds: [d2.id, d1.id] },
      });
      expect(result.isError).toBe(true);
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d1.id, d2.id]);
  });

  it('blocks demo user', async () => {
    process.env.DEMO_MODE = 'true';
    const { user } = createUser(testDb, { email: 'demo@nomad.app' });
    const trip = createTrip(testDb, user.id);
    const d1 = createDay(testDb, trip.id);
    const d2 = createDay(testDb, trip.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.callTool({
        name: 'reorder_days',
        arguments: { tripId: trip.id, orderedIds: [d2.id, d1.id] },
      });
      expect(result.isError).toBe(true);
    });

    expect(await dayIdsInOrder(trip.id)).toEqual([d1.id, d2.id]);
  });
});

// ---------------------------------------------------------------------------
// trek://trips/{tripId}/days resource (moved from resources.test.ts)
// ---------------------------------------------------------------------------

describe('Resource: trek://trips/{tripId}/days', () => {
  it('returns days with assignments in order', async () => {
    const { user } = createUser(testDb);
    const trip = createTrip(testDb, user.id);
    const day1 = createDay(testDb, trip.id, { day_number: 1 });
    const day2 = createDay(testDb, trip.id, { day_number: 2 });
    const place = createPlace(testDb, trip.id);
    createDayAssignment(testDb, day1.id, place.id);
    void day2;

    await withHarness(user.id, async (h) => {
      const result = await h.client.readResource({ uri: `trek://trips/${trip.id}/days` });
      const days = parseResourceResult(result) as any[];
      expect(days).toHaveLength(2);
      expect(days[0].day_number).toBe(1);
      expect(days[0].assignments).toHaveLength(1);
      expect(days[1].day_number).toBe(2);
      expect(days[1].assignments).toHaveLength(0);
    });
  });

  it('returns access denied for unauthorized trip', async () => {
    const { user } = createUser(testDb);
    const { user: other } = createUser(testDb);
    const trip = createTrip(testDb, other.id);

    await withHarness(user.id, async (h) => {
      const result = await h.client.readResource({ uri: `trek://trips/${trip.id}/days` });
      const data = parseResourceResult(result) as any;
      expect(data.error).toBeTruthy();
    });
  });
});