'use strict';

const request = require('supertest');
const app = require('../../src/main/app');
const { setDb } = require('../../src/db/knex');
const { createTestDb } = require('../helpers/testDb');
const { issueToken } = require('../../src/utils/jwt');
const { v4: uuidv4 } = require('uuid');

function makeUser(overrides = {}) {
  return {
    id: uuidv4(),
    email: 'jane@example.com',
    name: 'Jane Doe',
    profile_picture_url: null,
    email_verified: true,
    deleted_at: null,
    deletion_scheduled_at: null,
    created_at: new Date().toISOString(),
    updated_at: new Date().toISOString(),
    ...overrides,
  };
}

describe('Sync Route', () => {
  let db;
  let user;
  let token;

  beforeEach(() => {
    user = makeUser();
    db = createTestDb({
      users: [user],
      pantry_items: [],
      shopping_lists: [],
      shopping_list_items: [],
      deleted_records: [],
    });
    setDb(db);
    token = issueToken(user).token;
  });

  describe('GET /v1/sync', () => {
    it('returns full sync when no since param', async () => {
      const res = await request(app)
        .get('/v1/sync')
        .set('Authorization', `Bearer ${token}`);

      expect(res.status).toBe(200);
      expect(res.body.full_sync).toBe(true);
      expect(res.body.server_timestamp).toBeDefined();
      expect(res.body.pantry).toBeDefined();
      expect(res.body.shopping_lists).toBeDefined();
    });

    it('returns delta sync when since param provided', async () => {
      const since = new Date(Date.now() - 60000).toISOString(); // 1 minute ago
      const res = await request(app)
        .get(`/v1/sync?since=${encodeURIComponent(since)}`)
        .set('Authorization', `Bearer ${token}`);

      expect(res.status).toBe(200);
      expect(res.body.full_sync).toBe(false);
    });

    it('includes pantry items in full sync', async () => {
      db.seedTable('pantry_items', [
        {
          id: uuidv4(),
          user_id: user.id,
          item_name: 'Flour',
          item_name_lower: 'flour',
          quantity: 5,
          last_modified: new Date().toISOString(),
          created_at: new Date().toISOString(),
          updated_at: new Date().toISOString(),
        },
      ]);

      const res = await request(app)
        .get('/v1/sync')
        .set('Authorization', `Bearer ${token}`);

      expect(res.body.pantry.items).toHaveLength(1);
      expect(res.body.pantry.items[0].item_name).toBe('Flour');
      expect(res.body.pantry.items[0].deleted).toBe(false);
    });

    it('includes shopping lists in full sync', async () => {
      const listId = uuidv4();
      db.seedTable('shopping_lists', [
        {
          id: listId,
          user_id: user.id,
          list_name: 'Weekly',
          last_modified: new Date().toISOString(),
          created_at: new Date().toISOString(),
          updated_at: new Date().toISOString(),
        },
      ]);

      const res = await request(app)
        .get('/v1/sync')
        .set('Authorization', `Bearer ${token}`);

      expect(res.body.shopping_lists.lists).toHaveLength(1);
      expect(res.body.shopping_lists.lists[0].list_name).toBe('Weekly');
    });

    it('includes deleted_ids for tombstoned pantry items', async () => {
      const deletedId = uuidv4();
      const since = new Date(Date.now() - 60000).toISOString();

      db.seedTable('deleted_records', [
        {
          id: uuidv4(),
          user_id: user.id,
          record_type: 'pantry_item',
          record_id: deletedId,
          deleted_at: new Date().toISOString(),
        },
      ]);

      const res = await request(app)
        .get(`/v1/sync?since=${encodeURIComponent(since)}`)
        .set('Authorization', `Bearer ${token}`);

      expect(res.body.pantry.deleted_ids).toContain(deletedId);
    });

    it('returns 401 without token', async () => {
      const res = await request(app).get('/v1/sync');
      expect(res.status).toBe(401);
    });

    it('returns 400 for invalid since timestamp', async () => {
      const res = await request(app)
        .get('/v1/sync?since=not-a-date')
        .set('Authorization', `Bearer ${token}`);

      expect(res.status).toBe(400);
    });

    it('does not return data belonging to other users', async () => {
      const otherUser = makeUser({ id: uuidv4(), email: 'other@example.com' });
      db.seedTable('pantry_items', [
        {
          id: uuidv4(),
          user_id: otherUser.id,
          item_name: 'Sugar',
          item_name_lower: 'sugar',
          quantity: 3,
          last_modified: new Date().toISOString(),
          created_at: new Date().toISOString(),
          updated_at: new Date().toISOString(),
        },
      ]);

      const res = await request(app)
        .get('/v1/sync')
        .set('Authorization', `Bearer ${token}`);

      expect(res.body.pantry.items).toHaveLength(0);
    });
  });
});