'use strict';

// ── Regression tests for the "revoke plan access, no refund" feature ────────
// revokePlanSubscriberAccess() must replicate revokeTier's single-record
// "auto-downgrade to Free only if the user holds no other active tier" rule
// (controllers/admin/tiers.controller.js) instead of blanket-downgrading
// everyone, and must fire exactly one in-app notification batch plus one
// email per affected user.

jest.mock('../../models/tiers/user_tiers.mdl', () => ({
  findAll: jest.fn(),
  update: jest.fn(),
  bulkCreate: jest.fn(),
}));
jest.mock('../../models/users/users.mdl', () => ({ findAll: jest.fn() }));
jest.mock('../../models/notifications/user_notification.mdl', () => ({ bulkCreate: jest.fn() }));
jest.mock('../../services/email.service', () => ({ sendEmail: jest.fn().mockResolvedValue(true) }));

const mdl_UserTiers = require('../../models/tiers/user_tiers.mdl');
const mdl_Users = require('../../models/users/users.mdl');
const UserNotification = require('../../models/notifications/user_notification.mdl');
const { sendEmail } = require('../../services/email.service');

const { revokePlanSubscriberAccess, revokePlanSubscriberAccessBulk } = require('../../services/planAccess.service');

function makePlan(overrides = {}) {
  return { plan_id: 10, label: 'Premium – 1 Month', ...overrides };
}

beforeEach(() => jest.clearAllMocks());

describe('revokePlanSubscriberAccess()', () => {
  test('no active subscribers → no-op, returns zero count', async () => {
    mdl_UserTiers.findAll.mockResolvedValue([]);

    const result = await revokePlanSubscriberAccess(makePlan(), 99);

    expect(result).toEqual({ revoked_user_count: 0 });
    expect(mdl_UserTiers.update).not.toHaveBeenCalled();
    expect(UserNotification.bulkCreate).not.toHaveBeenCalled();
    expect(sendEmail).not.toHaveBeenCalled();
  });

  test('a user with ONLY this plan active gets auto-downgraded to Free', async () => {
    mdl_UserTiers.findAll
      .mockResolvedValueOnce([{ tier_id: 1, user_id: 5, plan_id: 10 }]) // active rows for the plan
      .mockResolvedValueOnce([]); // grouped "still active elsewhere" check — none
    mdl_Users.findAll.mockResolvedValue([{ user_id: 5, email: 'a@b.com', personal_info: { name: { full_name: 'Ana' } } }]);

    const result = await revokePlanSubscriberAccess(makePlan(), 99);

    expect(mdl_UserTiers.update).toHaveBeenCalledWith(
      expect.objectContaining({ status: 'revoked', revoked_by: 99 }),
      { where: { tier_id: [1] } }
    );
    expect(mdl_UserTiers.bulkCreate).toHaveBeenCalledWith([
      expect.objectContaining({ user_id: '5', tier: 'free', status: 'active' }),
    ]);
    expect(result).toEqual({ revoked_user_count: 1 });
  });

  test('a user with ANOTHER concurrently-active plan does NOT get downgraded', async () => {
    mdl_UserTiers.findAll
      .mockResolvedValueOnce([{ tier_id: 2, user_id: 6, plan_id: 10 }])
      .mockResolvedValueOnce([{ user_id: 6 }]); // still holds a different active tier
    mdl_Users.findAll.mockResolvedValue([{ user_id: 6, email: 'c@d.com', personal_info: {} }]);

    await revokePlanSubscriberAccess(makePlan(), 99);

    expect(mdl_UserTiers.bulkCreate).not.toHaveBeenCalled();
  });

  test('fires exactly one notification batch and one email per affected user', async () => {
    mdl_UserTiers.findAll
      .mockResolvedValueOnce([
        { tier_id: 1, user_id: 5, plan_id: 10 },
        { tier_id: 2, user_id: 6, plan_id: 10 },
      ])
      .mockResolvedValueOnce([{ user_id: 5 }, { user_id: 6 }]);
    mdl_Users.findAll.mockResolvedValue([
      { user_id: 5, email: 'a@b.com', personal_info: {} },
      { user_id: 6, email: 'c@d.com', personal_info: {} },
    ]);

    const result = await revokePlanSubscriberAccess(makePlan(), 99);

    expect(UserNotification.bulkCreate).toHaveBeenCalledTimes(1);
    expect(UserNotification.bulkCreate.mock.calls[0][0]).toHaveLength(2);
    expect(sendEmail).toHaveBeenCalledTimes(2);
    expect(sendEmail).toHaveBeenCalledWith(expect.objectContaining({ to: 'a@b.com', type: 'TIER_ACCESS_REVOKED' }));
    expect(result).toEqual({ revoked_user_count: 2 });
  });
});

describe('revokePlanSubscriberAccessBulk() — N+1 regression', () => {
  test('query count stays flat regardless of plan/subscriber count (no per-user or per-plan loop)', async () => {
    const plans = [
      { plan_id: 10, label: 'Premium – 1 Month' },
      { plan_id: 11, label: 'Premium – 1 Year' },
      { plan_id: 12, label: 'Basic' },
    ];
    const activeRows = Array.from({ length: 25 }, (_, i) => ({
      tier_id: i + 1,
      user_id: i + 1,
      plan_id: plans[i % plans.length].plan_id,
    }));
    mdl_UserTiers.findAll
      .mockResolvedValueOnce(activeRows) // active rows across all 3 plans
      .mockResolvedValueOnce([]); // grouped "still active" check — nobody else active
    mdl_Users.findAll.mockResolvedValue(
      activeRows.map((r) => ({ user_id: r.user_id, email: `${r.user_id}@x.com`, personal_info: {} })),
    );

    const result = await revokePlanSubscriberAccessBulk(plans, 99);

    // Exactly 2 findAll calls total (active rows + grouped still-active check),
    // 1 bulk update, 1 bulk downgrade create, 1 notification bulkCreate —
    // no matter how many plans/users were involved.
    expect(mdl_UserTiers.findAll).toHaveBeenCalledTimes(2);
    expect(mdl_UserTiers.update).toHaveBeenCalledTimes(1);
    expect(mdl_UserTiers.bulkCreate).toHaveBeenCalledTimes(1);
    expect(mdl_UserTiers.bulkCreate.mock.calls[0][0]).toHaveLength(25);
    expect(UserNotification.bulkCreate).toHaveBeenCalledTimes(1);
    expect(UserNotification.bulkCreate.mock.calls[0][0]).toHaveLength(25);
    expect(result).toEqual({ revoked_user_count: 25 });
  });
});