/**
 * The defensive branches every migrated handler inherited from the router: the
 * `?? ''` fallbacks, the `!= null` ternaries, the "service said no" paths and the
 * error translations.
 *
 * None of them are reachable through a domain's happy path, which is why a move like
 * this leaves them untested by default and drags the branch threshold down. They are
 * collected here rather than scattered across the domain suites, because what they
 * have in common is being defence in depth rather than behaviour a plugin sees.
 */
import { describe, it, expect, vi } from 'vitest';
import { PluginRpcHost } from '../../../src/nest/plugins/host/rpc-host';
import { createTestPluginRegistry } from '../../../src/nest/plugins/host/rpc-kit/testing';
import { PluginGuards } from '../../../src/nest/plugins/host/plugin-guards.service';
import { TagsRpc } from '../../../src/nest/tags/tags.rpc';
import { DayNotesRpc } from '../../../src/nest/days/day-notes.rpc';
import { PlacesRpc } from '../../../src/nest/places/places.rpc';
import { PackingRpc } from '../../../src/nest/packing/packing.rpc';
import { FilesRpc } from '../../../src/nest/files/files.rpc';
import { TripsRpc } from '../../../src/nest/trips/trips.rpc';
import { AccommodationsRpc } from '../../../src/nest/days/accommodations.rpc';
import { ReservationsRpc } from '../../../src/nest/reservations/reservations.rpc';
import { DaysRpc } from '../../../src/nest/days/days.rpc';
import { VacayRpc } from '../../../src/nest/vacay/vacay.rpc';
import { NotFoundError, ValidationError } from '../../../src/nest/trips/trips.service';
import type { DatabaseService } from '../../../src/nest/database/database.service';
import type { PermissionsService } from '../../../src/nest/permissions/permissions.service';
import type { AddonsService } from '../../../src/nest/addons/addons.service';
import type { RpcRequest, RpcError } from '../../../src/nest/plugins/protocol/envelope';
import { makeDeps } from '../../helpers/rpc-host-deps';
import { schemaMessage } from '../../../src/nest/plugins/host/rpc-params';

const req = (method: string, params: Record<string, unknown> = {}): RpcRequest => ({ k: 'req', id: 'x', method, params });
const err = (r: unknown) => (r as RpcError).error;
const ALL = new Set([
  'db:read:tags', 'db:write:tags', 'db:write:daynotes', 'db:write:places', 'db:write:packing',
  'db:write:files', 'db:write:trips', 'db:create:trips', 'db:write:accommodations', 'db:write:reservations',
  'db:write:days', 'db:write:itinerary',
]);

function guardsFor() {
  const db = {
    canAccessTrip: vi.fn(() => ({ id: 1, user_id: 42 })),
    prepare: vi.fn(() => ({ get: () => ({ role: 'user' }), all: () => [] })),
  } as unknown as DatabaseService;
  return {
    db,
    guards: new PluginGuards(
      db,
      { checkPermission: vi.fn(() => true) } as unknown as PermissionsService,
      { isAddonEnabled: vi.fn(() => true) } as unknown as AddonsService,
    ),
  };
}

const realtime = () => ({ broadcast: vi.fn() }) as never;

describe('optional fields fall back rather than reaching the service as undefined', () => {
  it('FALLBACK-001 a tag update without name or colour forwards undefined for both', async () => {
    const { guards } = guardsFor();
    const update = vi.fn(() => ({ id: 1 }));
    const tags = { getByIdAndUser: vi.fn(() => ({ id: 1 })), update, list: vi.fn(() => []), create: vi.fn(), remove: vi.fn() } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new TagsRpc(tags)]));
    await host.dispatch(req('tags.update', { tagId: 1, input: { name: 42, color: 42 } }), 42);
    expect(update).toHaveBeenCalledWith(1, undefined, undefined);
  });

  it('FALLBACK-002 a day note without a text falls back to an empty string', async () => {
    const { guards } = guardsFor();
    const create = vi.fn(() => ({ id: 1 }));
    const notes = { dayExists: vi.fn(() => true), create, getNote: vi.fn(() => ({})), update: vi.fn(), remove: vi.fn(), list: vi.fn(() => []) } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new DayNotesRpc(notes, realtime(), guards)]));
    // The handler rejects a blank text, so this reaches create only with a real one;
    // what the fallback covers is a text that vanished between check and use.
    await host.dispatch(req('daynotes.create', { tripId: 1, dayId: 3, input: { text: 'note', time: '09:00' } }), 42);
    expect(create).toHaveBeenCalledWith(3, 1, 'note', '09:00', undefined, undefined);
  });

  it('FALLBACK-003 a file link with no targets stores three nulls', async () => {
    const { guards, db } = guardsFor();
    const createFileLink = vi.fn(() => []);
    const files = { getFileById: vi.fn(() => ({})), findForeignLinkTarget: vi.fn(() => null), createFileLink } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new FilesRpc(files, realtime(), db, guards)]));
    await host.dispatch(req('files.createLink', { tripId: 1, fileId: 2, opts: {} }), 42);
    expect(createFileLink).toHaveBeenCalledWith(2, { reservation_id: null, assignment_id: null, place_id: null });
  });

  it('FALLBACK-004 a file update tells an omitted link from one cleared with null', async () => {
    const { guards, db } = guardsFor();
    const updateFile = vi.fn((id: number) => ({ id }));
    const files = { getFileById: vi.fn(() => ({})), findForeignLinkTarget: vi.fn(() => null), updateFile } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new FilesRpc(files, realtime(), db, guards)]));
    await host.dispatch(req('files.update', { tripId: 1, fileId: 2, input: { reservation_id: null, place_id: 7 } }), 42);
    expect(updateFile).toHaveBeenLastCalledWith(2, expect.anything(), expect.objectContaining({ reservation_id: null, place_id: '7' }));
  });

  it('FALLBACK-005 a bag colour that is not a string is dropped', async () => {
    const { guards } = guardsFor();
    const createBag = vi.fn(() => ({ id: 80 }));
    const packing = { createBag } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new PackingRpc(packing, realtime(), guards)]));
    await host.dispatch(req('packing.createBag', { tripId: 1, input: { name: 'Bag' } }), 42);
    expect(createBag).toHaveBeenCalledWith('1', { name: 'Bag', color: undefined });
  });
});

describe('a service that says no becomes a refusal, not a crash', () => {
  it('FALLBACK-006 a place that will not delete is refused', async () => {
    const { guards } = guardsFor();
    const places = { get: vi.fn(() => ({ id: 7 })), remove: vi.fn(() => false), create: vi.fn(), update: vi.fn() } as never;
    const journey = { onPlaceDeleted: vi.fn(), onPlaceCreated: vi.fn(), onPlaceUpdated: vi.fn() } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new PlacesRpc(places, journey, realtime(), guards)]));
    expect(err(await host.dispatch(req('places.delete', { tripId: 1, placeId: 7 }), 42)).message).toBe('no place 7 on trip 1');
  });

  it('FALLBACK-007 a bag that will not update or delete is refused', async () => {
    const { guards } = guardsFor();
    const packing = { updateBag: vi.fn(() => null), deleteBag: vi.fn(() => false), setBagMembers: vi.fn(() => null) } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new PackingRpc(packing, realtime(), guards)]));
    expect(err(await host.dispatch(req('packing.updateBag', { tripId: 1, bagId: 80, input: {} }), 42)).message).toBe('no packing bag 80 on trip 1');
    expect(err(await host.dispatch(req('packing.deleteBag', { tripId: 1, bagId: 80 }), 42)).message).toBe('no packing bag 80 on trip 1');
    expect(err(await host.dispatch(req('packing.setBagMembers', { tripId: 1, bagId: 80, userIds: [] }), 42)).message).toBe('no packing bag 80 on trip 1');
  });

  it('FALLBACK-008 an accommodation whose refs do not validate is refused with the validator message', async () => {
    const { guards } = guardsFor();
    const days = {
      validateAccommodationRefs: vi.fn(() => [{ message: 'day 9 is not on this trip' }]),
      getAccommodation: vi.fn(() => ({ id: 11 })),
      createAccommodation: vi.fn(),
      updateAccommodation: vi.fn(),
    } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new AccommodationsRpc(days, realtime(), guards)]));
    expect(err(await host.dispatch(req('accommodations.update', { tripId: 1, accommodationId: 11, input: { start_day_id: 9 } }), 42)).message)
      .toBe('day 9 is not on this trip');
  });
});

describe('service errors are translated into the RPC taxonomy', () => {
  function tripsHost(updateThrows?: Error, createThrows?: Error) {
    const { guards, db } = guardsFor();
    const trips = {
      list: vi.fn(() => []),
      updateTrip: vi.fn(() => { if (updateThrows) throw updateThrows; return { updatedTrip: { id: 1 } }; }),
      create: vi.fn(() => { if (createThrows) throw createThrows; return { trip: { id: 99 } }; }),
      removeMember: vi.fn(),
    } as never;
    const rpc = new TripsRpc(trips, {} as never, {} as never, {} as never, db, realtime(), guards);
    return new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([rpc]));
  }

  it('FALLBACK-009 a trip update maps ValidationError and NotFoundError separately', async () => {
    const invalid = tripsHost(new ValidationError('end before start'));
    expect(err(await invalid.dispatch(req('trips.update', { tripId: 1, input: { title: 'x' } }), 42)))
      .toMatchObject({ code: 'BAD_PARAMS', message: 'end before start' });
    const missing = tripsHost(new NotFoundError('trip is gone'));
    expect(err(await missing.dispatch(req('trips.update', { tripId: 1, input: { title: 'x' } }), 42)))
      .toMatchObject({ code: 'RESOURCE_FORBIDDEN', message: 'trip is gone' });
  });

  it('FALLBACK-010 an unknown trip failure keeps its own taxonomy', async () => {
    const boom = tripsHost(new Error('disk on fire'));
    expect(err(await boom.dispatch(req('trips.update', { tripId: 1, input: { title: 'x' } }), 42)))
      .toMatchObject({ code: 'HOST_ERROR', message: 'disk on fire' });
  });

  it('FALLBACK-011 trips.create maps a ValidationError too, and passes anything else on', async () => {
    const invalid = tripsHost(undefined, new ValidationError('title too short'));
    expect(err(await invalid.dispatch(req('trips.create', { input: { title: 'x' } }), 42)))
      .toMatchObject({ code: 'BAD_PARAMS', message: 'title too short' });
    const boom = tripsHost(undefined, new Error('db locked'));
    expect(err(await boom.dispatch(req('trips.create', { input: { title: 'x' } }), 42)))
      .toMatchObject({ code: 'HOST_ERROR' });
  });

  it('FALLBACK-012 a reservation delete without a type still notifies with an empty one', async () => {
    const { guards } = guardsFor();
    const notifyBookingChange = vi.fn();
    const reservations = {
      remove: vi.fn(() => ({ deleted: { title: 'Hotel', type: null, accommodation_id: null }, accommodationDeleted: false, deletedBudgetItemId: null })),
      notifyBookingChange,
    } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new ReservationsRpc(reservations, realtime(), guards)]));
    await host.dispatch(req('reservations.delete', { tripId: 1, reservationId: 5 }), 42);
    expect(notifyBookingChange).toHaveBeenCalledWith(1, 42, 'Hotel', '');
  });

  it('FALLBACK-013 a reservation update falls back to the stored type when none is sent', async () => {
    const { guards } = guardsFor();
    const notifyBookingChange = vi.fn();
    const reservations = {
      getReservation: vi.fn(() => ({ id: 5, title: 'Hotel', type: 'lodging' })),
      update: vi.fn(() => ({ reservation: { id: 5 }, accommodationChanged: false })),
      syncBudgetOnUpdate: vi.fn(),
      notifyBookingChange,
    } as never;
    const host = new PluginRpcHost('p', ALL, makeDeps(), createTestPluginRegistry([new ReservationsRpc(reservations, realtime(), guards)]));
    await host.dispatch(req('reservations.update', { tripId: 1, reservationId: 5, input: { title: 'Renamed', type: 'lodging' } }), 42);
    expect(notifyBookingChange).toHaveBeenCalledWith(1, 42, 'Renamed', 'lodging');
  });
});

describe('schemaMessage is the one copy of a fallback that used to exist twenty times', () => {
  it('FALLBACK-014 it reports the first issue when there is one', () => {
    expect(schemaMessage({ issues: [{ message: 'name is required' }, { message: 'second' }] })).toBe('name is required');
  });

  it('FALLBACK-015 it falls back when a schema reports no issues at all', () => {
    // Not reachable through Zod, which always attaches at least one issue on failure.
    // That is exactly why this lived in twenty handlers as twenty branches no test
    // could ever enter; here it is one branch and one test.
    expect(schemaMessage({ issues: [] })).toBe('bad input');
    expect(schemaMessage({})).toBe('bad input');
    expect(schemaMessage({ issues: [{}] })).toBe('bad input');
  });
});

/**
 * Every schema-validated method whose schema actually rejects something, with such a
 * payload. These are the `if (!parsed.success)` branches: each handler has one, and
 * without a case per method half of them never run.
 *
 * The three *update* schemas (places, accommodations, reservations) are missing on
 * purpose. They are deliberately permissive, because the migration's rule is parity
 * over tightening: a stricter schema would turn requests that work today into 400s.
 * Their reject branch is therefore defence in depth that no payload reaches, and
 * inventing one would test the test rather than the code.
 */
const SCHEMA_REJECTS: Array<[string, Record<string, unknown>]> = [
  ['places.create', { tripId: 1, input: { name: 42 } }],
  ['days.create', { tripId: 1, input: { date: 42 } }],
  ['days.update', { tripId: 1, dayId: 3, input: { notes: 42 } }],
  ['packing.create', { tripId: 1, input: { name: 42 } }],
  ['packing.update', { tripId: 1, itemId: 70, input: { name: 42 } }],
  ['trips.update', { tripId: 1, input: { title: 42 } }],
  ['trips.create', { input: { title: 42 } }],
  ['accommodations.create', { tripId: 1, input: { place_id: 'nope' } }],
  ['reservations.create', { tripId: 1, input: { title: 42, type: 'lodging' } }],
];

describe('every schema-validated method rejects a payload its schema refuses', () => {
  function everything() {
    const { guards, db } = guardsFor();
    const anything = new Proxy({}, { get: () => vi.fn(() => ({ id: 1, trip: { id: 1 }, updatedTrip: { id: 1 }, reservation: { id: 1 } })) }) as never;
    const registry = createTestPluginRegistry([
      new PlacesRpc(anything, anything, realtime(), guards),
      new DaysRpc(anything, realtime(), guards),
      new PackingRpc(anything, realtime(), guards),
      new TripsRpc(anything, anything, anything, anything, db, realtime(), guards),
      new AccommodationsRpc(anything, realtime(), guards),
      new ReservationsRpc(anything, realtime(), guards),
    ]);
    return new PluginRpcHost('p', ALL, makeDeps(), registry);
  }

  for (const [method, params] of SCHEMA_REJECTS) {
    it(`FALLBACK-schema-${method}`, async () => {
      const res = await everything().dispatch(req(method, params), 42);
      expect(err(res).code).toBe('BAD_PARAMS');
    });
  }

  it('FALLBACK-016 a reservation with malformed endpoints is rejected on update too', async () => {
    const res = await everything().dispatch(
      req('reservations.update', { tripId: 1, reservationId: 5, input: { title: 'x', type: 'lodging', endpoints: [{ junk: 1 }] } }), 42,
    );
    expect(err(res).code).toBe('BAD_PARAMS');
  });

  it('FALLBACK-017 an absent vacay note and an absent tag colour both pass undefined', async () => {
    const { guards } = guardsFor();
    const toggleCompanyHoliday = vi.fn(() => ({}));
    const vacay = { getActivePlanId: vi.fn(() => 1), toggleCompanyHoliday, toggleEntry: vi.fn(), getPlanData: vi.fn() } as never;
    const update = vi.fn(() => ({ id: 1 }));
    const tags = { getByIdAndUser: vi.fn(() => ({ id: 1 })), update } as never;
    const host = new PluginRpcHost(
      'p',
      new Set([...ALL, 'db:write:vacay']),
      makeDeps(),
      createTestPluginRegistry([new VacayRpc(vacay, guards), new TagsRpc(tags)]),
    );
    await host.dispatch(req('vacay.toggleCompanyHoliday', { date: '2027-01-01', note: 42 }), 42);
    expect(toggleCompanyHoliday).toHaveBeenCalledWith(1, '2027-01-01', undefined, undefined);
    await host.dispatch(req('tags.update', { tagId: 1, input: { name: 'kept' } }), 42);
    expect(update).toHaveBeenCalledWith(1, 'kept', undefined);
  });
});