'use strict';

// Tier Plans v2: item-specific entitlement means two DIFFERENT plans at the
// SAME tier slug (e.g. two separate Premium bundles) must be able to stay
// concurrently active for one user, each governing its own distinct
// user_tier_grants snapshot — buying a second Premium bundle must not just
// extend the first one's expiry (see captureOrder in
// controllers/client/tiers.controller.js).
//
// The old partial unique index (20270101000075) enforced "one active row per
// (user_id, tier)", which blocks that. Replace it with "one active row per
// (user_id, plan_id)" — still prevents accidentally double-purchasing/
// double-granting the exact same plan concurrently, but allows multiple
// plans at the same tier to coexist. NULL plan_id rows (admin-granted
// tiers with no backing plan) are never considered equal to one another by
// a unique index, so they're unaffected.
//
// NOT auto-run — do not execute against the shared dev/prod database without
// explicit confirmation.
module.exports = {
  async up(queryInterface) {
    await queryInterface.removeIndex('user_tiers', 'user_tiers_one_active_per_user_tier');
    await queryInterface.addIndex('user_tiers', ['user_id', 'plan_id'], {
      unique: true,
      where: { status: 'active' },
      name: 'user_tiers_one_active_per_user_plan',
    });
  },

  async down(queryInterface) {
    await queryInterface.removeIndex('user_tiers', 'user_tiers_one_active_per_user_plan');
    await queryInterface.addIndex('user_tiers', ['user_id', 'tier'], {
      unique: true,
      where: { status: 'active' },
      name: 'user_tiers_one_active_per_user_tier',
    });
  },
};