import { describe, it, expect, beforeEach, vi } from 'vitest';
import { http, HttpResponse } from 'msw';
import { useTripStore } from '../../src/store/tripStore';
import { resetAllStores } from '../helpers/store';
import { buildTrip, buildDay, buildPlace, buildPackingItem, buildTodoItem, buildTag, buildCategory, buildAssignment, buildDayNote, buildBudgetItem, buildReservation, buildTripFile } from '../helpers/factories';
import { server } from '../helpers/msw/server';

vi.mock('../../src/api/websocket', () => ({
  connect: vi.fn(),
  disconnect: vi.fn(),
  getSocketId: vi.fn(() => null),
  joinTrip: vi.fn(),
  leaveTrip: vi.fn(),
  addListener: vi.fn(),
  removeListener: vi.fn(),
  setRefetchCallback: vi.fn(),
  setPreReconnectHook: vi.fn(),
}));

beforeEach(() => {
  resetAllStores();
});

/** Full set of MSW handlers for one trip's loadTrip fan-out. */
function tripHandlers(
  id: number,
  data: {
    budget?: unknown[]; reservations?: unknown[]; files?: unknown[];
    tags?: unknown[]; categories?: unknown[];
  },
) {
  return [
    http.get(`/api/trips/${id}`, () => HttpResponse.json({ trip: buildTrip({ id }) })),
    http.get(`/api/trips/${id}/days`, () => HttpResponse.json({ days: [] })),
    http.get(`/api/trips/${id}/places`, () => HttpResponse.json({ places: [] })),
    http.get(`/api/trips/${id}/packing`, () => HttpResponse.json({ items: [] })),
    http.get(`/api/trips/${id}/todo`, () => HttpResponse.json({ items: [] })),
    http.get(`/api/trips/${id}/budget`, () => HttpResponse.json({ items: data.budget ?? [] })),
    http.get(`/api/trips/${id}/reservations`, () => HttpResponse.json({ reservations: data.reservations ?? [] })),
    http.get(`/api/trips/${id}/files`, () => HttpResponse.json({ files: data.files ?? [] })),
    http.get('/api/tags', () => HttpResponse.json({ tags: data.tags ?? [] })),
    http.get('/api/categories', () => HttpResponse.json({ categories: data.categories ?? [] })),
  ];
}

describe('tripStore', () => {
  describe('loadTrip', () => {
    it('FE-TRIP-001: fires parallel API calls for trips, days, places, packing, todo, tags, categories', async () => {
      const calledUrls: string[] = [];
      server.use(
        http.get('/api/trips/:id', ({ params }) => {
          calledUrls.push(`/api/trips/${params.id}`);
          return HttpResponse.json({ trip: buildTrip({ id: Number(params.id) }) });
        }),
        http.get('/api/trips/:id/days', ({ params }) => {
          calledUrls.push(`/api/trips/${params.id}/days`);
          return HttpResponse.json({ days: [] });
        }),
        http.get('/api/trips/:id/places', ({ params }) => {
          calledUrls.push(`/api/trips/${params.id}/places`);
          return HttpResponse.json({ places: [] });
        }),
        http.get('/api/trips/:id/packing', ({ params }) => {
          calledUrls.push(`/api/trips/${params.id}/packing`);
          return HttpResponse.json({ items: [] });
        }),
        http.get('/api/trips/:id/todo', ({ params }) => {
          calledUrls.push(`/api/trips/${params.id}/todo`);
          return HttpResponse.json({ items: [] });
        }),
        http.get('/api/tags', () => {
          calledUrls.push('/api/tags');
          return HttpResponse.json({ tags: [] });
        }),
        http.get('/api/categories', () => {
          calledUrls.push('/api/categories');
          return HttpResponse.json({ categories: [] });
        }),
      );

      await useTripStore.getState().loadTrip(1);

      expect(calledUrls).toContain('/api/trips/1');
      expect(calledUrls).toContain('/api/trips/1/days');
      expect(calledUrls).toContain('/api/trips/1/places');
      expect(calledUrls).toContain('/api/trips/1/packing');
      expect(calledUrls).toContain('/api/trips/1/todo');
      expect(calledUrls).toContain('/api/tags');
      expect(calledUrls).toContain('/api/categories');
    });

    it('FE-TRIP-002: after loadTrip, all store fields are populated', async () => {
      const trip = buildTrip({ id: 1 });
      const place = buildPlace({ trip_id: 1 });
      const packingItem = buildPackingItem({ trip_id: 1 });
      const todoItem = buildTodoItem({ trip_id: 1 });
      const tag = buildTag();
      const category = buildCategory();

      server.use(
        http.get('/api/trips/1', () => HttpResponse.json({ trip })),
        http.get('/api/trips/1/days', () => HttpResponse.json({ days: [] })),
        http.get('/api/trips/1/places', () => HttpResponse.json({ places: [place] })),
        http.get('/api/trips/1/packing', () => HttpResponse.json({ items: [packingItem] })),
        http.get('/api/trips/1/todo', () => HttpResponse.json({ items: [todoItem] })),
        http.get('/api/tags', () => HttpResponse.json({ tags: [tag] })),
        http.get('/api/categories', () => HttpResponse.json({ categories: [category] })),
      );

      await useTripStore.getState().loadTrip(1);
      const state = useTripStore.getState();

      expect(state.trip).toEqual(trip);
      expect(state.places).toEqual([place]);
      expect(state.packingItems).toEqual([packingItem]);
      expect(state.todoItems).toEqual([todoItem]);
      expect(state.tags).toEqual([tag]);
      expect(state.categories).toEqual([category]);
    });

    it('FE-TRIP-003: loadTrip extracts assignments map from days response', async () => {
      const assignment = buildAssignment({ day_id: 10, order_index: 0 });
      const day = buildDay({ id: 10, assignments: [assignment], notes_items: [] });

      server.use(
        http.get('/api/trips/1', () => HttpResponse.json({ trip: buildTrip({ id: 1 }) })),
        http.get('/api/trips/1/days', () => HttpResponse.json({ days: [day] })),
        http.get('/api/trips/1/places', () => HttpResponse.json({ places: [] })),
        http.get('/api/trips/1/packing', () => HttpResponse.json({ items: [] })),
        http.get('/api/trips/1/todo', () => HttpResponse.json({ items: [] })),
        http.get('/api/tags', () => HttpResponse.json({ tags: [] })),
        http.get('/api/categories', () => HttpResponse.json({ categories: [] })),
      );

      await useTripStore.getState().loadTrip(1);
      const { assignments } = useTripStore.getState();

      expect(assignments['10']).toBeDefined();
      expect(assignments['10']).toEqual([assignment]);
    });

    it('FE-TRIP-004: loadTrip extracts dayNotes map from days response', async () => {
      const note = buildDayNote({ day_id: 10 });
      const day = buildDay({ id: 10, assignments: [], notes_items: [note] });

      server.use(
        http.get('/api/trips/1', () => HttpResponse.json({ trip: buildTrip({ id: 1 }) })),
        http.get('/api/trips/1/days', () => HttpResponse.json({ days: [day] })),
        http.get('/api/trips/1/places', () => HttpResponse.json({ places: [] })),
        http.get('/api/trips/1/packing', () => HttpResponse.json({ items: [] })),
        http.get('/api/trips/1/todo', () => HttpResponse.json({ items: [] })),
        http.get('/api/tags', () => HttpResponse.json({ tags: [] })),
        http.get('/api/categories', () => HttpResponse.json({ categories: [] })),
      );

      await useTripStore.getState().loadTrip(1);
      const { dayNotes } = useTripStore.getState();

      expect(dayNotes['10']).toBeDefined();
      expect(dayNotes['10']).toEqual([note]);
    });

    it('FE-TRIP-005: loadTrip sets isLoading true during, false after', async () => {
      let wasLoadingDuringFetch = false;

      server.use(
        http.get('/api/trips/1', () => {
          wasLoadingDuringFetch = useTripStore.getState().isLoading;
          return HttpResponse.json({ trip: buildTrip({ id: 1 }) });
        }),
        http.get('/api/trips/1/days', () => HttpResponse.json({ days: [] })),
        http.get('/api/trips/1/places', () => HttpResponse.json({ places: [] })),
        http.get('/api/trips/1/packing', () => HttpResponse.json({ items: [] })),
        http.get('/api/trips/1/todo', () => HttpResponse.json({ items: [] })),
        http.get('/api/tags', () => HttpResponse.json({ tags: [] })),
        http.get('/api/categories', () => HttpResponse.json({ categories: [] })),
      );

      const promise = useTripStore.getState().loadTrip(1);
      expect(useTripStore.getState().isLoading).toBe(true);
      await promise;
      expect(wasLoadingDuringFetch).toBe(true);
      expect(useTripStore.getState().isLoading).toBe(false);
    });

    it('FE-TRIP-006: loadTrip on API failure sets error and isLoading: false', async () => {
      server.use(
        http.get('/api/trips/1', () => HttpResponse.json({ message: 'Not found' }, { status: 404 })),
        http.get('/api/trips/1/days', () => HttpResponse.json({ days: [] })),
        http.get('/api/trips/1/places', () => HttpResponse.json({ places: [] })),
        http.get('/api/trips/1/packing', () => HttpResponse.json({ items: [] })),
        http.get('/api/trips/1/todo', () => HttpResponse.json({ items: [] })),
        http.get('/api/tags', () => HttpResponse.json({ tags: [] })),
        http.get('/api/categories', () => HttpResponse.json({ categories: [] })),
      );

      await expect(useTripStore.getState().loadTrip(1)).rejects.toThrow();

      const state = useTripStore.getState();
      expect(state.isLoading).toBe(false);
      expect(state.error).not.toBeNull();
    });

    it('FE-TRIP-H5: loadTrip uniformly hydrates budget, reservations and files', async () => {
      const budgetItem = buildBudgetItem({ trip_id: 1 });
      const reservation = buildReservation({ trip_id: 1 });
      const file = buildTripFile({ trip_id: 1 });
      server.use(...tripHandlers(1, { budget: [budgetItem], reservations: [reservation], files: [file] }));

      await useTripStore.getState().loadTrip(1);
      const state = useTripStore.getState();

      expect(state.budgetItems).toEqual([budgetItem]);
      expect(state.reservations).toEqual([reservation]);
      expect(state.files).toEqual([file]);
    });

    it('FE-TRIP-H4: switching trips does not leak budget/reservations/files from the previous trip', async () => {
      // Trip 1 has budget/reservations/files; trip 2 has none.
      server.use(...tripHandlers(1, {
        budget: [buildBudgetItem({ trip_id: 1 })],
        reservations: [buildReservation({ trip_id: 1 })],
        files: [buildTripFile({ trip_id: 1 })],
      }));
      await useTripStore.getState().loadTrip(1);
      expect(useTripStore.getState().budgetItems).toHaveLength(1);

      server.use(...tripHandlers(2, {}));
      await useTripStore.getState().loadTrip(2);
      const state = useTripStore.getState();

      expect(state.trip!.id).toBe(2);
      expect(state.budgetItems).toEqual([]);
      expect(state.reservations).toEqual([]);
      expect(state.files).toEqual([]);
    });

    it('FE-TRIP-H4b: resetTrip clears every trip-scoped slice but keeps tags/categories', async () => {
      server.use(...tripHandlers(1, {
        budget: [buildBudgetItem({ trip_id: 1 })],
        reservations: [buildReservation({ trip_id: 1 })],
        files: [buildTripFile({ trip_id: 1 })],
        tags: [buildTag()],
      }));
      await useTripStore.getState().loadTrip(1);
      expect(useTripStore.getState().budgetItems).toHaveLength(1);

      useTripStore.getState().resetTrip();
      const state = useTripStore.getState();

      expect(state.trip).toBeNull();
      expect(state.places).toEqual([]);
      expect(state.budgetItems).toEqual([]);
      expect(state.reservations).toEqual([]);
      expect(state.files).toEqual([]);
      expect(state.selectedDayId).toBeNull();
      // Global lookups survive a trip reset.
      expect(state.tags).toHaveLength(1);
    });
  });

  describe('hydrateActiveTrip', () => {
    const loadHandlers = (places: unknown[] = [], budget: unknown[] = []) => [
      http.get('/api/trips/1', () => HttpResponse.json({ trip: buildTrip({ id: 1 }) })),
      http.get('/api/trips/1/days', () => HttpResponse.json({ days: [] })),
      http.get('/api/trips/1/places', () => HttpResponse.json({ places })),
      http.get('/api/trips/1/packing', () => HttpResponse.json({ items: [] })),
      http.get('/api/trips/1/todo', () => HttpResponse.json({ items: [] })),
      http.get('/api/trips/1/budget', () => HttpResponse.json({ items: budget })),
      http.get('/api/trips/1/reservations', () => HttpResponse.json({ reservations: [] })),
      http.get('/api/trips/1/files', () => HttpResponse.json({ files: [] })),
      http.get('/api/tags', () => HttpResponse.json({ tags: [] })),
      http.get('/api/categories', () => HttpResponse.json({ categories: [] })),
    ];

    it('FE-TRIP-H1: silently refreshes resources without resetting or splashing', async () => {
      server.use(...loadHandlers());
      await useTripStore.getState().loadTrip(1);
      expect(useTripStore.getState().trip!.id).toBe(1);

      // New collaborative state arrives (as if edited by someone while we were offline).
      const place = buildPlace({ trip_id: 1 });
      const budgetItem = buildBudgetItem({ trip_id: 1 });
      server.use(...loadHandlers([place], [budgetItem]));

      await useTripStore.getState().hydrateActiveTrip(1);
      const state = useTripStore.getState();

      expect(state.places).toEqual([place]);
      expect(state.budgetItems).toEqual([budgetItem]);
      expect(state.trip!.id).toBe(1);      // trip not reset
      expect(state.isLoading).toBe(false); // no splash toggled
    });
  });

  describe('refreshDays', () => {
    it('FE-TRIP-007: refreshDays re-fetches days and rebuilds assignments/dayNotes maps', async () => {
      const assignment = buildAssignment({ day_id: 20, order_index: 0 });
      const note = buildDayNote({ day_id: 20 });
      const day = buildDay({ id: 20, assignments: [assignment], notes_items: [note] });

      server.use(
        http.get('/api/trips/1/days', () => HttpResponse.json({ days: [day] })),
      );

      await useTripStore.getState().refreshDays(1);
      const state = useTripStore.getState();

      expect(state.days).toHaveLength(1);
      expect(state.assignments['20']).toEqual([assignment]);
      expect(state.dayNotes['20']).toEqual([note]);
    });
  });

  describe('updateTrip', () => {
    it('FE-TRIP-008: updateTrip persists and refreshes trip + days', async () => {
      const updatedTrip = buildTrip({ id: 1, title: 'Updated Trip' });

      server.use(
        http.put('/api/trips/1', () => HttpResponse.json({ trip: updatedTrip })),
        http.get('/api/trips/1/days', () => HttpResponse.json({ days: [] })),
      );

      const result = await useTripStore.getState().updateTrip(1, { title: 'Updated Trip' });

      expect(result).toEqual(updatedTrip);
      expect(useTripStore.getState().trip).toEqual(updatedTrip);
    });
  });

  describe('setSelectedDay', () => {
    it('FE-TRIP-009: setSelectedDay updates selectedDayId', () => {
      useTripStore.getState().setSelectedDay(42);
      expect(useTripStore.getState().selectedDayId).toBe(42);

      useTripStore.getState().setSelectedDay(null);
      expect(useTripStore.getState().selectedDayId).toBeNull();
    });
  });

  describe('addTag', () => {
    it('FE-TRIP-010: addTag creates tag and appends to tags', async () => {
      const existingTag = buildTag();
      useTripStore.setState({ tags: [existingTag] });

      const newTagData = { name: 'New Tag', color: '#00ff00' };

      const result = await useTripStore.getState().addTag(newTagData);

      expect(result.name).toBe('New Tag');
      const tags = useTripStore.getState().tags;
      expect(tags).toHaveLength(2);
      expect(tags[tags.length - 1].name).toBe('New Tag');
    });
  });

  describe('addCategory', () => {
    it('FE-TRIP-011: addCategory creates category and appends to categories', async () => {
      const existingCategory = buildCategory();
      useTripStore.setState({ categories: [existingCategory] });

      const newCategoryData = { name: 'New Category', icon: 'hotel' };

      const result = await useTripStore.getState().addCategory(newCategoryData);

      expect(result.name).toBe('New Category');
      const categories = useTripStore.getState().categories;
      expect(categories).toHaveLength(2);
      expect(categories[categories.length - 1].name).toBe('New Category');
    });
  });
});