'use strict';

// ── Regression tests for item-specific entitlement (Tier Plans v2) ──────────
// Before this change, canAccessCourse/canAccessUnit/canAccessLesson unlocked
// content purely off tier RANK (any active Premium purchase unlocked every
// premium-tagged course). Now a Tier Plan purchase only grants the EXACT
// items its bundle contained at purchase time (recorded in
// user_tier_grants) — plain tier rank alone must no longer be sufficient.
// These tests exercise the real controller/model objects (Sequelize doesn't
// connect until a query actually runs) and stub only the specific static
// methods each scenario touches, via jest.spyOn.

const { Course } = require('../../models/courses/courses.associations');
const { mdl_UserTierGrants } = require('../../models/tiers/tier.associations');
const mdl_UserTiers = require('../../models/tiers/user_tiers.mdl');
const mdl_TierCategories = require('../../models/tiers/tier_categories.mdl');
const { mdl_UserGroupMembers } = require('../../models/users/user_groups.mdl');
const mdl_Product = require('../../models/courses/products.mdl');
const mdl_CoursePurchase = require('../../models/courses/course_purchases.mdl');

const { canAccessCourse } = require('../../controllers/client/courses.controller');

function mockActiveTierUnused() {
  jest.spyOn(mdl_UserTiers, 'findAll').mockResolvedValue([]);
  jest.spyOn(mdl_TierCategories, 'findAll').mockResolvedValue([]);
  jest.spyOn(mdl_UserGroupMembers, 'findAll').mockResolvedValue([]);
}

afterEach(() => jest.restoreAllMocks());

describe('canAccessCourse() — item-specific entitlement', () => {
  test('free/ungated course is always accessible, no grant lookup needed', async () => {
    jest.spyOn(Course, 'findOne').mockResolvedValue({ subscription: 'free', status: 'published' });
    const grantSpy = jest.spyOn(mdl_UserTierGrants, 'findOne');

    const result = await canAccessCourse(1, 100);

    expect(result).toBe(true);
    expect(grantSpy).not.toHaveBeenCalled();
  });

  test('unpublished course is never accessible regardless of entitlement', async () => {
    jest.spyOn(Course, 'findOne').mockResolvedValue({ subscription: 'premium', status: 'draft' });

    const result = await canAccessCourse(1, 100);

    expect(result).toBe(false);
  });

  test('premium course with no grant, no purchase, no active tier → denied (tier rank alone no longer grants access)', async () => {
    jest.spyOn(Course, 'findOne').mockResolvedValue({ subscription: 'premium', status: 'published' });
    jest.spyOn(mdl_UserTierGrants, 'findOne').mockResolvedValue(null);
    jest.spyOn(mdl_Product, 'findOne').mockResolvedValue(null);
    mockActiveTierUnused();

    const result = await canAccessCourse(1, 100);

    expect(result).toBe(false);
  });

  test('premium course unlocked by an item-specific grant for THIS exact course', async () => {
    jest.spyOn(Course, 'findOne').mockResolvedValue({ subscription: 'premium', status: 'published' });
    jest.spyOn(mdl_UserTierGrants, 'findOne').mockResolvedValue({ item_id: 100 }); // active grant found
    mockActiveTierUnused();

    const result = await canAccessCourse(1, 100);

    expect(result).toBe(true);
  });

  test('premium course still unlocked via a valid individual (a la carte) purchase, unrelated to any tier grant', async () => {
    jest.spyOn(Course, 'findOne').mockResolvedValue({ subscription: 'premium', status: 'published' });
    jest.spyOn(mdl_UserTierGrants, 'findOne').mockResolvedValue(null);
    jest.spyOn(mdl_Product, 'findOne').mockResolvedValue({ id: 55 });
    jest.spyOn(mdl_CoursePurchase, 'findOne').mockResolvedValue({ id: 1 });
    mockActiveTierUnused();

    const result = await canAccessCourse(1, 100);

    expect(result).toBe(true);
  });
});