assets and tier plans revamp

Signed-off-by: Kenneth Obsequio <k80308392@gmail.com>

controllers/admin/units.controller.js

@@ -41,6 +41,7 @@ const CompletionRequirement = require("../../models/courses/completion_requireme
 const { VALID_ENTITY_TYPES } = require("../../utils/courses/completion_requirements.registry");
 
 const mdl_Users = require("../../models/users/users.mdl");
+const { mdl_PlanUnits, mdl_TierPlans } = require("../../models/tiers/tier.associations");
 
 const notDeleted  = { deletedAt: null };
 const onlyDeleted = { deletedAt: { [Op.not]: null } };
@@ -160,6 +161,46 @@ exports.getUnitsFlat = async (req, res) => {
   }
 };
 
+// Bundle picker (Tier Plan wizard) — mirrors getCoursesBySubscription in
+// controllers/admin/courses.controller.js.
+exports.getUnitsBySubscription = async (req, res) => {
+  try {
+    const { slug } = req.query;
+    if (!slug) return R.error(res, 'slug query param is required.', 400);
+
+    const rows = await Unit.findAll({
+      where: { ...notDeleted, subscription: slug },
+      attributes: ['unit_id', 'title', 'description', 'subscription'],
+      include: [{
+        model:      mdl_PlanUnits,
+        as:         'planUnit',
+        required:   false,
+        attributes: ['plan_id'],
+        include: [{
+          model:      mdl_TierPlans,
+          as:         'plan',
+          attributes: ['plan_id', 'label'],
+        }],
+      }],
+      order: [['title', 'ASC']],
+    });
+
+    // Flatten so the frontend can just check `assigned_plan` — a unit belongs
+    // to at most one plan (UNIQUE constraint on plan_units.unit_id).
+    const data = rows.map((u) => {
+      const plain = u.toJSON();
+      const assigned_plan = plain.planUnit?.plan ?? null;
+      delete plain.planUnit;
+      return { ...plain, assigned_plan };
+    });
+
+    return R.success(res, 'Units retrieved.', data);
+  } catch (err) {
+    console.error('[UNIT LIB][BY SUBSCRIPTION]', err);
+    return R.error(res, 'Could not retrieve units.', 500);
+  }
+};
+
 exports.getUnit = async (req, res) => {
   try {
     const { unitId } = req.params;