further apply zoning and add ordering by zone feature

backend/constants/classifications.js

@@ -100,17 +100,57 @@ const ITEM_GROUPS = {
   ],
 };
 
-const ZONES = [
+// Store zones - path-oriented physical shopping areas
-  "Front Entry",
+// Applicable to Costco, 99 Ranch, Stater Bros, and similar large grocery stores
-  "Fresh Foods Right",
+const ZONES = {
-  "Fresh Foods Left",
+  ENTRANCE: "Entrance & Seasonal",
-  "Center Aisles",
+  PRODUCE_SECTION: "Produce & Fresh Vegetables",
-  "Bakery",
+  MEAT_SEAFOOD: "Meat & Seafood Counter",
-  "Meat Department",
+  DELI_PREPARED: "Deli & Prepared Foods",
-  "Dairy Cooler",
+  BAKERY_SECTION: "Bakery",
-  "Freezer Section",
+  DAIRY_SECTION: "Dairy & Refrigerated",
-  "Back Wall",
+  FROZEN_FOODS: "Frozen Foods",
-  "Checkout Area",
+  DRY_GOODS_CENTER: "Center Aisles (Dry Goods)",
+  BEVERAGES: "Beverages & Water",
+  SNACKS_CANDY: "Snacks & Candy",
+  HOUSEHOLD_CLEANING: "Household & Cleaning",
+  HEALTH_BEAUTY: "Health & Beauty",
+  CHECKOUT_AREA: "Checkout Area",
+};
+
+// Default zone mapping for each item type
+// This determines where items are typically found in the store
+const ITEM_TYPE_TO_ZONE = {
+  [ITEM_TYPES.PRODUCE]: ZONES.PRODUCE_SECTION,
+  [ITEM_TYPES.MEAT]: ZONES.MEAT_SEAFOOD,
+  [ITEM_TYPES.DAIRY]: ZONES.DAIRY_SECTION,
+  [ITEM_TYPES.BAKERY]: ZONES.BAKERY_SECTION,
+  [ITEM_TYPES.FROZEN]: ZONES.FROZEN_FOODS,
+  [ITEM_TYPES.PANTRY]: ZONES.DRY_GOODS_CENTER,
+  [ITEM_TYPES.BEVERAGE]: ZONES.BEVERAGES,
+  [ITEM_TYPES.SNACK]: ZONES.SNACKS_CANDY,
+  [ITEM_TYPES.HOUSEHOLD]: ZONES.HOUSEHOLD_CLEANING,
+  [ITEM_TYPES.PERSONAL_CARE]: ZONES.HEALTH_BEAUTY,
+  [ITEM_TYPES.OTHER]: ZONES.DRY_GOODS_CENTER,
+};
+
+// Optimal walking flow through the store
+// Represents a typical shopping path that minimizes backtracking
+// Start with perimeter (fresh items), then move to center aisles, end at checkout
+const ZONE_FLOW = [
+  ZONES.ENTRANCE,
+  ZONES.PRODUCE_SECTION,
+  ZONES.MEAT_SEAFOOD,
+  ZONES.DELI_PREPARED,
+  ZONES.BAKERY_SECTION,
+  ZONES.DAIRY_SECTION,
+  ZONES.FROZEN_FOODS,
+  ZONES.DRY_GOODS_CENTER,
+  ZONES.BEVERAGES,
+  ZONES.SNACKS_CANDY,
+  ZONES.HOUSEHOLD_CLEANING,
+  ZONES.HEALTH_BEAUTY,
+  ZONES.CHECKOUT_AREA,
 ];
 
 // Validation helpers
@@ -121,13 +161,20 @@ const isValidItemGroup = (type, group) => {
   return ITEM_GROUPS[type]?.includes(group) || false;
 };
 
-const isValidZone = (zone) => ZONES.includes(zone);
+const isValidZone = (zone) => Object.values(ZONES).includes(zone);
+
+const getSuggestedZone = (itemType) => {
+  return ITEM_TYPE_TO_ZONE[itemType] || null;
+};
 
 module.exports = {
   ITEM_TYPES,
   ITEM_GROUPS,
   ZONES,
+  ITEM_TYPE_TO_ZONE,
+  ZONE_FLOW,
   isValidItemType,
   isValidItemGroup,
   isValidZone,
+  getSuggestedZone,
 };

backend/models/list.model.js

@@ -11,13 +11,17 @@ exports.getUnboughtItems = async () => {
       ENCODE(gl.item_image, 'base64') as item_image,
       gl.image_mime_type,
       ARRAY_AGG(DISTINCT COALESCE(gh_user.name, creator.name)) FILTER (WHERE COALESCE(gh_user.name, creator.name) IS NOT NULL) as added_by_users,
-      gl.modified_on as last_added_on
+      gl.modified_on as last_added_on,
+      ic.item_type,
+      ic.item_group,
+      ic.zone
     FROM grocery_list gl
     LEFT JOIN users creator ON gl.added_by = creator.id
     LEFT JOIN grocery_history gh ON gl.id = gh.list_item_id
     LEFT JOIN users gh_user ON gh.added_by = gh_user.id
+    LEFT JOIN item_classification ic ON gl.id = ic.id
     WHERE gl.bought = FALSE
-    GROUP BY gl.id, gl.item_name, gl.quantity, gl.bought, gl.item_image, gl.image_mime_type, gl.modified_on
+    GROUP BY gl.id, gl.item_name, gl.quantity, gl.bought, gl.item_image, gl.image_mime_type, gl.modified_on, ic.item_type, ic.item_group, ic.zone
     ORDER BY gl.id ASC`
   );
   return result.rows;

frontend/src/components/AddItemWithDetailsModal.jsx

@@ -1,5 +1,5 @@
 import { useRef, useState } from "react";
-import { ITEM_GROUPS, ITEM_TYPES, ZONES, getItemTypeLabel } from "../constants/classifications";
+import { ITEM_GROUPS, ITEM_TYPES, getItemTypeLabel, getZoneValues } from "../constants/classifications";
 import "../styles/AddItemWithDetailsModal.css";
 
 export default function AddItemWithDetailsModal({ itemName, onConfirm, onSkip, onCancel }) {
@@ -159,7 +159,7 @@ export default function AddItemWithDetailsModal({ itemName, onConfirm, onSkip, o
               className="add-item-details-select"
             >
               <option value="">-- Select Zone --</option>
-              {ZONES.map((z) => (
+              {getZoneValues().map((z) => (
                 <option key={z} value={z}>
                   {z}
                 </option>

frontend/src/components/EditItemModal.jsx

@@ -1,5 +1,5 @@
 import { useEffect, useState } from "react";
-import { ITEM_GROUPS, ITEM_TYPES, ZONES, getItemTypeLabel } from "../constants/classifications";
+import { ITEM_GROUPS, ITEM_TYPES, getItemTypeLabel, getZoneValues } from "../constants/classifications";
 import "../styles/EditItemModal.css";
 
 export default function EditItemModal({ item, onSave, onCancel }) {
@@ -134,7 +134,7 @@ export default function EditItemModal({ item, onSave, onCancel }) {
             className="edit-modal-select"
           >
             <option value="">-- Select Zone --</option>
-            {ZONES.map((z) => (
+            {getZoneValues().map((z) => (
               <option key={z} value={z}>
                 {z}
               </option>

frontend/src/components/SortDropdown.jsx

@@ -5,6 +5,7 @@ export default function SortDropdown({ value, onChange }) {
       <option value="za">Z → A</option>
       <option value="qty-high">Quantity: High → Low</option>
       <option value="qty-low">Quantity: Low → High</option>
+      <option value="zone">By Zone</option>
     </select>
   );
 }

frontend/src/constants/classifications.js

@@ -101,18 +101,57 @@ export const ITEM_GROUPS = {
   ],
 };
 
-// Store zones for Costco layout
+// Store zones - path-oriented physical shopping areas
-export const ZONES = [
+// Applicable to Costco, 99 Ranch, Stater Bros, and similar large grocery stores
-  "Front Entry",
+export const ZONES = {
-  "Fresh Foods Right",
+  ENTRANCE: "Entrance & Seasonal",
-  "Fresh Foods Left",
+  PRODUCE_SECTION: "Produce & Fresh Vegetables",
-  "Center Aisles",
+  MEAT_SEAFOOD: "Meat & Seafood Counter",
-  "Bakery",
+  DELI_PREPARED: "Deli & Prepared Foods",
-  "Meat Department",
+  BAKERY_SECTION: "Bakery",
-  "Dairy Cooler",
+  DAIRY_SECTION: "Dairy & Refrigerated",
-  "Freezer Section",
+  FROZEN_FOODS: "Frozen Foods",
-  "Back Wall",
+  DRY_GOODS_CENTER: "Center Aisles (Dry Goods)",
-  "Checkout Area",
+  BEVERAGES: "Beverages & Water",
+  SNACKS_CANDY: "Snacks & Candy",
+  HOUSEHOLD_CLEANING: "Household & Cleaning",
+  HEALTH_BEAUTY: "Health & Beauty",
+  CHECKOUT_AREA: "Checkout Area",
+};
+
+// Default zone mapping for each item type
+// This determines where items are typically found in the store
+export const ITEM_TYPE_TO_ZONE = {
+  [ITEM_TYPES.PRODUCE]: ZONES.PRODUCE_SECTION,
+  [ITEM_TYPES.MEAT]: ZONES.MEAT_SEAFOOD,
+  [ITEM_TYPES.DAIRY]: ZONES.DAIRY_SECTION,
+  [ITEM_TYPES.BAKERY]: ZONES.BAKERY_SECTION,
+  [ITEM_TYPES.FROZEN]: ZONES.FROZEN_FOODS,
+  [ITEM_TYPES.PANTRY]: ZONES.DRY_GOODS_CENTER,
+  [ITEM_TYPES.BEVERAGE]: ZONES.BEVERAGES,
+  [ITEM_TYPES.SNACK]: ZONES.SNACKS_CANDY,
+  [ITEM_TYPES.HOUSEHOLD]: ZONES.HOUSEHOLD_CLEANING,
+  [ITEM_TYPES.PERSONAL_CARE]: ZONES.HEALTH_BEAUTY,
+  [ITEM_TYPES.OTHER]: ZONES.DRY_GOODS_CENTER,
+};
+
+// Optimal walking flow through the store
+// Represents a typical shopping path that minimizes backtracking
+// Start with perimeter (fresh items), then move to center aisles, end at checkout
+export const ZONE_FLOW = [
+  ZONES.ENTRANCE,
+  ZONES.PRODUCE_SECTION,
+  ZONES.MEAT_SEAFOOD,
+  ZONES.DELI_PREPARED,
+  ZONES.BAKERY_SECTION,
+  ZONES.DAIRY_SECTION,
+  ZONES.FROZEN_FOODS,
+  ZONES.DRY_GOODS_CENTER,
+  ZONES.BEVERAGES,
+  ZONES.SNACKS_CANDY,
+  ZONES.HOUSEHOLD_CLEANING,
+  ZONES.HEALTH_BEAUTY,
+  ZONES.CHECKOUT_AREA,
 ];
 
 // Helper to get display label for item type
@@ -132,3 +171,11 @@ export const getItemTypeLabel = (type) => {
   };
   return labels[type] || type;
 };
+
+// Helper to get all zone values as array (for dropdowns)
+export const getZoneValues = () => Object.values(ZONES);
+
+// Helper to get suggested zone for an item type
+export const getSuggestedZone = (itemType) => {
+  return ITEM_TYPE_TO_ZONE[itemType] || null;
+};

frontend/src/pages/GroceryList.jsx

@@ -18,7 +18,7 @@ export default function GroceryList() {
   const [items, setItems] = useState([]);
   const [recentlyBoughtItems, setRecentlyBoughtItems] = useState([]);
   const [sortedItems, setSortedItems] = useState([]);
-  const [sortMode, setSortMode] = useState("az");
+  const [sortMode, setSortMode] = useState("zone");
   const [suggestions, setSuggestions] = useState([]);
   const [showAddForm, setShowAddForm] = useState(false);
   const [loading, setLoading] = useState(true);
@@ -60,6 +60,29 @@ export default function GroceryList() {
     if (sortMode === "za") sorted.sort((a, b) => b.item_name.localeCompare(a.item_name));
     if (sortMode === "qty-high") sorted.sort((a, b) => b.quantity - a.quantity);
     if (sortMode === "qty-low") sorted.sort((a, b) => a.quantity - b.quantity);
+    if (sortMode === "zone") {
+      sorted.sort((a, b) => {
+        // Items without classification go to the end
+        if (!a.item_type && b.item_type) return 1;
+        if (a.item_type && !b.item_type) return -1;
+        if (!a.item_type && !b.item_type) return a.item_name.localeCompare(b.item_name);
+
+        // Sort by item_type
+        const typeCompare = (a.item_type || "").localeCompare(b.item_type || "");
+        if (typeCompare !== 0) return typeCompare;
+
+        // Then by item_group
+        const groupCompare = (a.item_group || "").localeCompare(b.item_group || "");
+        if (groupCompare !== 0) return groupCompare;
+
+        // Then by zone
+        const zoneCompare = (a.zone || "").localeCompare(b.zone || "");
+        if (zoneCompare !== 0) return zoneCompare;
+
+        // Finally by name
+        return a.item_name.localeCompare(b.item_name);
+      });
+    }
 
     setSortedItems(sorted);
   }, [items, sortMode]);
@@ -277,6 +300,19 @@ export default function GroceryList() {
     setEditingItem(null);
   };
 
+  // Group items by zone for classification view
+  const groupItemsByZone = (items) => {
+    const groups = {};
+    items.forEach(item => {
+      const zone = item.zone || 'unclassified';
+      if (!groups[zone]) {
+        groups[zone] = [];
+      }
+      groups[zone].push(item);
+    });
+    return groups;
+  };
+
   if (loading) return <p>Loading...</p>;
 
   return (
@@ -295,6 +331,37 @@ export default function GroceryList() {
           />
         )}
 
+        {sortMode === "zone" ? (
+          // Grouped view by zone
+          (() => {
+            const grouped = groupItemsByZone(sortedItems);
+            return Object.keys(grouped).map(zone => (
+              <div key={zone} className="glist-classification-group">
+                <h3 className="glist-classification-header">
+                  {zone === 'unclassified' ? 'Unclassified' : zone}
+                </h3>
+                <ul className="glist-ul">
+                  {grouped[zone].map((item) => (
+                    <GroceryListItem
+                      key={item.id}
+                      item={item}
+                      onClick={(quantity) =>
+                        [ROLES.ADMIN, ROLES.EDITOR].includes(role) && handleBought(item.id, quantity)
+                      }
+                      onImageAdded={
+                        [ROLES.ADMIN, ROLES.EDITOR].includes(role) ? handleImageAdded : null
+                      }
+                      onLongPress={
+                        [ROLES.ADMIN, ROLES.EDITOR].includes(role) ? handleLongPress : null
+                      }
+                    />
+                  ))}
+                </ul>
+              </div>
+            ));
+          })()
+        ) : (
+          // Regular flat list view
           <ul className="glist-ul">
             {sortedItems.map((item) => (
               <GroceryListItem
@@ -312,10 +379,11 @@ export default function GroceryList() {
               />
             ))}
           </ul>
+        )}
 
         {recentlyBoughtItems.length > 0 && (
           <>
-            <h2 className="glist-section-title">Recently Bought (Last 24 Hours)</h2>
+            <h2 className="glist-section-title">Recently Bought (24HR)</h2>
             <ul className="glist-ul">
               {recentlyBoughtItems.map((item) => (
                 <GroceryListItem

frontend/src/styles/GroceryList.css

@@ -31,6 +31,22 @@
   padding-top: 1em;
 }
 
+/* Classification Groups */
+.glist-classification-group {
+  margin-bottom: 2em;
+}
+
+.glist-classification-header {
+  font-size: 1.1em;
+  font-weight: 600;
+  color: #007bff;
+  margin: 1em 0 0.5em 0;
+  padding: 0.5em 0.8em;
+  background: #e7f3ff;
+  border-left: 4px solid #007bff;
+  border-radius: 4px;
+}
+
 /* Inputs */
 .glist-input {
   font-size: 1em;