feat: huge push of product changes and item review with cart

backend/server/app.py

@@ -197,16 +197,54 @@ def dump_logs(
         print(traceback.format_exc())
         raise HTTPException(status_code=500, detail=str(e))
 
-@app.get("/api/products/{product_type}")
+@app.get("/api/products/{product_id}")
+async def get_product_by_id(product_id: str):
+    """fetch single product by id from either hotel_products or airline_products"""
+    try:
+        supabase = get_supabase()
+
+        # try hotel_products first
+        response = supabase.table('hotel_products').select('*').eq('id', product_id).execute()
+        if response.data and len(response.data) > 0:
+            return {"success": True, "data": response.data[0]}
+
+        # try airline_products
+        response = supabase.table('airline_products').select('*').eq('id', product_id).execute()
+        if response.data and len(response.data) > 0:
+            return {"success": True, "data": response.data[0]}
+
+        raise HTTPException(status_code=404, detail="Product not found")
+
+    except HTTPException:
+        raise
+    except Exception as e:
+        import traceback
+        print(f"[PRODUCT_BY_ID_ERROR] {e}")
+        print(traceback.format_exc())
+        raise HTTPException(status_code=500, detail=str(e))
+
+@app.get("/api/products/type/{product_type}")
 async def get_products(
     product_type: str,
-    dateIndex: Optional[int] = None
+    dateIndex: Optional[int] = None,
+    origin: Optional[str] = None,
+    destination: Optional[str] = None,
+    tripType: Optional[str] = None,
+    adults: Optional[int] = None,
+    children: Optional[int] = None,
+    infants: Optional[int] = None,
+    rooms: Optional[int] = None
 ):
     """fetch products from supabase based on type (hotel or airline)
 
     params:
         product_type: either 'hotel' or 'airline'
         dateIndex: optional days offset from today (e.g., 0=today, 1=tomorrow, -1=yesterday)
+        origin: (airline) departure airport code
+        destination: (airline/hotel) arrival airport or hotel location
+        tripType: (airline) roundtrip, oneway, multicity
+        adults, children, infants: passenger counts
+        rooms: (hotel) number of rooms
     """
     if product_type not in ['hotel', 'airline']:
         raise HTTPException(status_code=400, detail="product_type must be 'hotel' or 'airline'")
@@ -222,8 +260,60 @@ async def get_products(
             query = query.eq('date_index', dateIndex)
 
         response = query.execute()
+        results = response.data
 
-        return {"success": True, "count": len(response.data), "data": response.data}
+        # apply in-memory filters based on metadata for airline products
+        if product_type == 'airline' and results:
+            filtered = []
+            for product in results:
+                metadata = product.get('metadata', {})
+
+                # filter by origin airport
+                if origin:
+                    dep = metadata.get('departure', {})
+                    if dep.get('airport') != origin:
+                        continue
+
+                # filter by destination airport
+                if destination:
+                    arr = metadata.get('arrival', {})
+                    if arr.get('airport') != destination:
+                        continue
+
+                # passenger count validation (ensure total capacity)
+                if adults is not None or children is not None or infants is not None:
+                    total_pax = (adults or 0) + (children or 0) + (infants or 0)
+                    avail = product.get('availability', 0)
+                    if avail < total_pax:
+                        continue
+
+                filtered.append(product)
+
+            results = filtered
+
+        # apply in-memory filters for hotel products
+        elif product_type == 'hotel' and results:
+            filtered = []
+            for product in results:
+                metadata = product.get('metadata', {})
+
+                # filter by occupancy capacity
+                if adults is not None:
+                    max_occ = metadata.get('max_occupancy', 2)
+                    if max_occ < adults:
+                        continue
+
+                # filter by room availability
+                if rooms is not None:
+                    avail = product.get('availability', 0)
+                    if avail < rooms:
+                        continue
+
+                filtered.append(product)
+
+            results = filtered
+
+        return {"success": True, "count": len(results), "data": results}
 
     except Exception as e:
         import traceback

web/src/app/airline/products/[id]/page.tsx

@@ -0,0 +1,106 @@
+'use client';
+
+import { useState, useEffect } from 'react';
+import { useParams, useRouter } from 'next/navigation';
+import { Navigation } from '@/components/ui';
+import { useCart } from '@/contexts/CartContext';
+import AirlineDetails from '@/components/feats/airline/AirlineDetails';
+import { transformProduct, type Flight, type AirlineProduct } from '@/lib/airline-utils';
+import type { EventName } from '@/lib/events';
+
+const dispatchInteraction = (eventName: EventName, productId?: string, metadata?: Record<string, unknown>) => {
+  const e = new CustomEvent('definedInteraction', {
+    detail: { eventName, productId, metadata },
+  });
+  document.dispatchEvent(e);
+};
+
+export default function AirlineProductPage() {
+  const params = useParams();
+  const router = useRouter();
+  const { addItem } = useCart();
+  const [product, setProduct] = useState<Flight | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [added, setAdded] = useState(false);
+
+  const productId = params.id as string;
+
+  useEffect(() => {
+    const fetchProduct = async () => {
+      try {
+        const res = await fetch(`/api/products/${productId}`);
+        if (!res.ok) throw new Error(`Failed to fetch: ${res.status}`);
+        const json = await res.json();
+        const transformed = transformProduct(json.data as AirlineProduct);
+        setProduct(transformed);
+
+        // fire learn_more_about_item event when product loads
+        dispatchInteraction('learn_more_about_item', productId, {
+          type: 'airline',
+          dateIndex: transformed.dateIndex,
+          flightType: transformed.flightType,
+        });
+      } catch (e) {
+        setError(e instanceof Error ? e.message : 'Failed to load product');
+        console.error('[FETCH_FLIGHT_ERROR]', e);
+      } finally {
+        setLoading(false);
+      }
+    };
+    fetchProduct();
+  }, [productId]);
+
+  const handleAddToCart = () => {
+    if (!product) return;
+
+    addItem({
+      id: productId,
+      type: 'airline',
+      name: product.flightType,
+      price: product.basePrice,
+      metadata: {
+        departure: product.departure,
+        arrival: product.arrival,
+        duration: product.duration,
+        cabinClass: product.cabinClass,
+      },
+      dateIndex: product.dateIndex,
+    });
+
+    dispatchInteraction('add_item_to_cart', productId, {
+      type: 'airline',
+      price: product.basePrice,
+    });
+
+    setAdded(true);
+    setTimeout(() => setAdded(false), 2000);
+  };
+
+  return (
+    <>
+      <Navigation />
+      <main className="max-w-4xl mx-auto px-4 py-8">
+        {loading && <div className="text-center py-8">Loading flight details...</div>}
+        {error && <div className="text-red-500 text-center py-8">{error}</div>}
+
+        {!loading && !error && product && (
+          <>
+            <AirlineDetails
+              product={product}
+              onAddToCart={handleAddToCart}
+              addedToCart={added}
+            />
+
+            <button
+              onClick={() => router.back()}
+              className="mt-6 text-blue-600 hover:underline"
+            >
+              ← Back to flights
+            </button>
+          </>
+        )}
+      </main>
+    </>
+  );
+}

web/src/app/airline/products/page.tsx

@@ -18,8 +18,12 @@ function FlightsList() {
         const url = new URL('/api/products', window.location.origin);
         url.searchParams.set('type', 'airline');
 
-        const dateIndex = searchParams.get('dateIndex');
-        if (dateIndex) url.searchParams.set('dateIndex', dateIndex);
+        // forward all relevant search params to the API
+        const params = ['dateIndex', 'origin', 'destination', 'tripType', 'adults', 'children', 'infants'];
+        params.forEach(param => {
+          const val = searchParams.get(param);
+          if (val) url.searchParams.set(param, val);
+        });
 
         const res = await fetch(url.toString());
         if (!res.ok) throw new Error(`Failed to fetch: ${res.status}`);

web/src/app/api/products/[id]/route.ts

@@ -0,0 +1,35 @@
+import { NextRequest, NextResponse } from 'next/server';
+
+export async function GET(
+  req: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const { id } = await params;
+
+  if (!id) {
+    return NextResponse.json(
+      { error: 'product id is required' },
+      { status: 400 }
+    );
+  }
+
+  try {
+    const backendUrl = process.env.BACKEND_URL || 'http://localhost:5000';
+    const url = new URL(`${backendUrl}/api/products/${id}`);
+
+    const res = await fetch(url.toString());
+
+    if (!res.ok) {
+      throw new Error(`Backend returned ${res.status}`);
+    }
+
+    const data = await res.json();
+    return NextResponse.json(data);
+  } catch (error) {
+    console.error('[PRODUCT_DETAIL_ERROR]', error);
+    return NextResponse.json(
+      { error: 'Failed to fetch product details' },
+      { status: 500 }
+    );
+  }
+}

web/src/app/api/products/route.ts

@@ -13,11 +13,14 @@ export async function GET(req: NextRequest) {
 
   try {
     const backendUrl = process.env.BACKEND_URL || 'http://localhost:5000';
-    const url = new URL(`${backendUrl}/api/products/${type}`);
+    const url = new URL(`${backendUrl}/api/products/type/${type}`);
 
-    // forward date index offset to backend
-    const dateIndex = searchParams.get('dateIndex');
-    if (dateIndex) url.searchParams.set('dateIndex', dateIndex);
+    // forward all query params to backend (excluding 'type')
+    searchParams.forEach((value, key) => {
+      if (key !== 'type') {
+        url.searchParams.set(key, value);
+      }
+    });
 
     const res = await fetch(url.toString());
 

web/src/app/cart/page.tsx

@@ -0,0 +1,110 @@
+'use client';
+
+import { Navigation } from '@/components/ui';
+import { useCart } from '@/contexts/CartContext';
+import type { EventName } from '@/lib/events';
+
+const dispatchInteraction = (eventName: EventName, productId?: string, metadata?: Record<string, unknown>) => {
+    const e = new CustomEvent('definedInteraction', {
+        detail: { eventName, productId, metadata },
+    });
+    document.dispatchEvent(e);
+};
+
+export default function CartPage() {
+    const { items, removeItem, clearCart, itemCount } = useCart();
+
+    const handleRemove = (id: string, type: string) => {
+        removeItem(id);
+        dispatchInteraction('remove_item', id, { type });
+    };
+    let itemTypes = Array.from(new Set(items.map(item => item.type)))[0] || 'items';
+
+
+    const total = items.reduce((sum, item) => sum + item.price, 0);
+
+    return (
+        <>
+            <Navigation />
+            <main className="max-w-4xl mx-auto px-4 py-8">
+                <div className="flex justify-between items-center mb-6">
+                    <h1 className="text-3xl font-bold">Shopping Cart</h1>
+                    {itemCount > 0 && (
+                        <button
+                            onClick={clearCart}
+                            className="text-sm text-red-600 hover:underline"
+                        >
+                            Clear cart
+                        </button>
+                    )}
+                </div>
+
+                {itemCount === 0 ? (
+                    <div className="text-center py-12">
+                        <p className="text-gray-500 mb-4">Your cart is empty</p>
+                        <a href="/" className="text-blue-600 hover:underline">Browse our selection</a>
+                    </div>
+                ) : (
+                    <>
+                        <div className="space-y-4 mb-8">
+                            {items.map(item => (
+                                <div
+                                    key={item.id}
+                                    className="flex justify-between items-start p-4 border rounded-lg hover:bg-gray-50"
+                                >
+                                    <div className="flex-1">
+                                        <div className="flex items-center gap-2 mb-1">
+                                            <span className="px-2 py-0.5 text-xs font-medium rounded bg-blue-100 text-blue-800">
+                                                {item.type}
+                                            </span>
+                                            <h3 className="font-semibold">{item.name}</h3>
+                                        </div>
+
+                                        {item.type === 'hotel' && (
+                                            <div className="text-sm text-gray-600">
+                                                <p>{item.metadata.roomType as string}</p>
+                                                <p>{item.metadata.checkIn as string} - {item.metadata.checkOut as string}</p>
+                                                <p>{item.metadata.nights} night{(item.metadata.nights as number) > 1 ? 's' : ''}</p>
+                                            </div>
+                                        )}
+
+                                        {item.type === 'airline' && (
+                                            <div className="text-sm text-gray-600">
+                                                <p>{item.metadata.cabinClass as string} Class</p>
+                                                <p>{(item.metadata.departure as any).airport} → {(item.metadata.arrival as any).airport}</p>
+                                                <p>Duration: {item.metadata.duration as string}</p>
+                                            </div>
+                                        )}
+                                    </div>
+
+                                    <div className="text-right ml-4">
+                                        <p className="text-xl font-bold mb-2">${item.price}</p>
+                                        <button
+                                            onClick={() => handleRemove(item.id, item.type)}
+                                            className="text-sm text-red-600 hover:underline"
+                                        >
+                                            Remove
+                                        </button>
+                                    </div>
+                                </div>
+                            ))}
+                        </div>
+
+                        <div className="border-t pt-4">
+                            <div className="flex justify-between items-center mb-4">
+                                <span className="text-xl font-semibold">Total</span>
+                                <span className="text-3xl font-bold">${total.toFixed(2)}</span>
+                            </div>
+                            <button
+                                onClick={() => dispatchInteraction('checkout_start', undefined, { total, itemCount })}
+                                className="w-full py-3 bg-blue-600 hover:bg-blue-700 text-white rounded-lg font-medium transition-colors"
+                            >
+                                Proceed to Checkout
+                            </button>
+                        </div>
+                    </>
+                )}
+            </main>
+        </>
+    );
+}

web/src/app/hotel/products/[id]/page.tsx

@@ -0,0 +1,106 @@
+'use client';
+
+import { useState, useEffect } from 'react';
+import { useParams, useRouter } from 'next/navigation';
+import { Navigation } from '@/components/ui';
+import { useCart } from '@/contexts/CartContext';
+import HotelDetails from '@/components/feats/hotel/HotelDetails';
+import { transformProduct, type Hotel, type HotelProduct } from '@/lib/hotel-utils';
+import type { EventName } from '@/lib/events';
+
+const dispatchInteraction = (eventName: EventName, productId?: string, metadata?: Record<string, unknown>) => {
+  const e = new CustomEvent('definedInteraction', {
+    detail: { eventName, productId, metadata },
+  });
+  document.dispatchEvent(e);
+};
+
+export default function HotelProductPage() {
+  const params = useParams();
+  const router = useRouter();
+  const { addItem } = useCart();
+  const [product, setProduct] = useState<Hotel | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [added, setAdded] = useState(false);
+
+  const productId = params.id as string;
+
+  useEffect(() => {
+    const fetchProduct = async () => {
+      try {
+        const res = await fetch(`/api/products/${productId}`);
+        if (!res.ok) throw new Error(`Failed to fetch: ${res.status}`);
+        const json = await res.json();
+        const transformed = transformProduct(json.data as HotelProduct);
+        setProduct(transformed);
+
+        // fire learn_more_about_item event when product loads
+        dispatchInteraction('learn_more_about_item', productId, {
+          type: 'hotel',
+          dateIndex: transformed.dateIndex,
+          roomType: transformed.roomType,
+        });
+      } catch (e) {
+        setError(e instanceof Error ? e.message : 'Failed to load product');
+        console.error('[FETCH_HOTEL_ERROR]', e);
+      } finally {
+        setLoading(false);
+      }
+    };
+    fetchProduct();
+  }, [productId]);
+
+  const handleAddToCart = () => {
+    if (!product) return;
+
+    addItem({
+      id: productId,
+      type: 'hotel',
+      name: product.name,
+      price: product.pricePerNight,
+      metadata: {
+        roomType: product.roomType,
+        nights: product.nights,
+        checkIn: product.checkIn,
+        checkOut: product.checkOut,
+      },
+      dateIndex: product.dateIndex,
+    });
+
+    dispatchInteraction('add_item_to_cart', productId, {
+      type: 'hotel',
+      price: product.pricePerNight,
+    });
+
+    setAdded(true);
+    setTimeout(() => setAdded(false), 2000);
+  };
+
+  return (
+    <>
+      <Navigation />
+      <main className="max-w-4xl mx-auto px-4 py-8">
+        {loading && <div className="text-center py-8">Loading hotel details...</div>}
+        {error && <div className="text-red-500 text-center py-8">{error}</div>}
+
+        {!loading && !error && product && (
+          <>
+            <HotelDetails
+              product={product}
+              onAddToCart={handleAddToCart}
+              addedToCart={added}
+            />
+
+            <button
+              onClick={() => router.back()}
+              className="mt-6 text-blue-600 hover:underline"
+            >
+              ← Back to rooms
+            </button>
+          </>
+        )}
+      </main>
+    </>
+  );
+}

web/src/app/hotel/products/page.tsx

@@ -18,8 +18,12 @@ function RoomsList() {
         const url = new URL('/api/products', window.location.origin);
         url.searchParams.set('type', 'hotel');
 
-        const dateIndex = searchParams.get('dateIndex');
-        if (dateIndex) url.searchParams.set('dateIndex', dateIndex);
+        // forward all relevant search params to the API
+        const params = ['dateIndex', 'destination', 'adults', 'rooms'];
+        params.forEach(param => {
+          const val = searchParams.get(param);
+          if (val) url.searchParams.set(param, val);
+        });
 
         const res = await fetch(url.toString());
         if (!res.ok) throw new Error(`Failed to fetch: ${res.status}`);

web/src/app/layout.tsx

@@ -2,6 +2,7 @@ import type { Metadata } from "next";
 import { Geist, Geist_Mono } from "next/font/google";
 import "./globals.css";
 import { TrackingProvider } from "@/components/TrackingProvider";
+import { CartProvider } from "@/contexts/CartContext";
 
 const geistSans = Geist({
   variable: "--font-geist-sans",
@@ -28,7 +29,9 @@ export default function RootLayout({
       <body
         className={`${geistSans.variable} ${geistMono.variable} antialiased`}
       >
+        <CartProvider>
           <TrackingProvider>{children}</TrackingProvider>
+        </CartProvider>
       </body>
     </html>
   );

web/src/components/feats/airline/AirlineCard.tsx

@@ -32,6 +32,7 @@ export default function AirlineCard({ flight }: { flight: Flight }) {
             price: flight.basePrice,
             dateIndex: flight.dateIndex,
         });
+        window.location.href = `/airline/products/${flight.id}`;
     };
 
     return (

web/src/components/feats/airline/AirlineDetails.tsx

@@ -0,0 +1,83 @@
+'use client';
+
+import type { Flight } from '@/lib/airline-utils';
+
+interface AirlineDetailsProps {
+  product: Flight;
+  onAddToCart: () => void;
+  addedToCart: boolean;
+}
+
+export default function AirlineDetails({ product, onAddToCart, addedToCart }: AirlineDetailsProps) {
+  return (
+    <div className="space-y-6">
+      <div className="bg-gray-100 h-64 flex items-center justify-center rounded-lg">
+        <span className="text-gray-400">Flight Image</span>
+      </div>
+
+      <div>
+        <h1 className="text-3xl font-bold mb-2">{product.flightType}</h1>
+        <p className="text-lg text-gray-600">{product.cabinClass} Class</p>
+      </div>
+
+      <div className="grid grid-cols-2 gap-6">
+        <div>
+          <h3 className="font-semibold mb-2">Departure</h3>
+          <p className="text-xl font-bold">{product.departure.time}</p>
+          <p className="text-gray-600">{product.departure.airport}</p>
+        </div>
+        <div>
+          <h3 className="font-semibold mb-2">Arrival</h3>
+          <p className="text-xl font-bold">{product.arrival.time}</p>
+          <p className="text-gray-600">{product.arrival.airport}</p>
+        </div>
+      </div>
+
+      <div className="grid grid-cols-3 gap-4 py-4 border-y">
+        <div>
+          <p className="text-sm text-gray-600">Duration</p>
+          <p className="font-semibold">{product.duration}</p>
+        </div>
+        <div>
+          <p className="text-sm text-gray-600">Stops</p>
+          <p className="font-semibold">
+            {product.stops === 0 ? 'Nonstop' : `${product.stops} stop${product.stops > 1 ? 's' : ''}`}
+          </p>
+        </div>
+        <div>
+          <p className="text-sm text-gray-600">Availability</p>
+          <p className="font-semibold">{product.availability} seats</p>
+        </div>
+      </div>
+
+      <div>
+        <h3 className="font-semibold mb-2">Fare Details</h3>
+        <p className="text-sm text-gray-600 mb-1">{product.fareRule}</p>
+        {product.refundable && (
+          <div className="bg-green-50 border border-green-200 rounded-lg p-3 mt-2">
+            <p className="text-green-800 text-sm font-medium">Refundable fare</p>
+          </div>
+        )}
+      </div>
+
+      <div className="border-t pt-4">
+        <div className="flex justify-between items-center">
+          <div>
+            <p className="text-sm text-gray-600">Total price</p>
+            <p className="text-3xl font-bold">${product.basePrice}</p>
+          </div>
+        </div>
+      </div>
+
+      <div className="flex gap-4">
+        <button
+          onClick={onAddToCart}
+          disabled={addedToCart}
+          className="w-full px-6 py-3 bg-blue-600 hover:bg-blue-700 disabled:bg-green-600 text-white rounded-lg font-medium transition-colors"
+        >
+          {addedToCart ? 'Added to Cart!' : 'Add to Cart'}
+        </button>
+      </div>
+    </div>
+  );
+}

web/src/components/feats/airline/AirlineHero.tsx

@@ -1,7 +1,9 @@
 'use client';
 
 import { useState, FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
 import { Button, Label, Input, DateInput, RadioGroup, Dropdown, DropdownCounter } from '@/components/ui';
+import { dateToDaysFromToday } from '@/lib/airline-utils';
 
 type TripType = 'roundtrip' | 'oneway' | 'multicity';
 
@@ -19,6 +21,7 @@ const LocationIcon = () => (
 );
 
 export default function AirlineHero() {
+  const router = useRouter();
   const [tripType, setTripType] = useState<TripType>('roundtrip');
   const [origin, setOrigin] = useState('');
   const [destination, setDestination] = useState('');
@@ -28,7 +31,23 @@ export default function AirlineHero() {
 
   const handleSearch = (e: FormEvent) => {
     e.preventDefault();
-    console.log({ tripType, origin, destination, departDate, returnDate, passengers });
+    const params = new URLSearchParams();
+
+    if (departDate) {
+      const daysOffset = dateToDaysFromToday(departDate);
+      params.set('dateIndex', daysOffset.toString());
+    }
+
+    if (origin) params.set('origin', origin);
+    if (destination) params.set('destination', destination);
+    if (tripType !== 'roundtrip') params.set('tripType', tripType);
+    if (returnDate && tripType === 'roundtrip') params.set('returnDate', returnDate);
+
+    params.set('adults', passengers.adults.toString());
+    params.set('children', passengers.children.toString());
+    params.set('infants', passengers.infants.toString());
+
+    router.push(`/airline/products?${params.toString()}`);
   };
 
   const totalPax = passengers.adults + passengers.children + passengers.infants;

web/src/components/feats/hotel/HotelCard.tsx

@@ -44,6 +44,7 @@ export default function HotelCard({ hotel }: { hotel: Hotel }) {
             nights: hotel.nights,
             dateIndex: hotel.dateIndex,
         });
+        window.location.href = `/hotel/products/${hotel.id}`;
     };
 
     return (

web/src/components/feats/hotel/HotelDetails.tsx

@@ -0,0 +1,74 @@
+'use client';
+
+import type { Hotel } from '@/lib/hotel-utils';
+
+interface HotelDetailsProps {
+  product: Hotel;
+  onAddToCart: () => void;
+  addedToCart: boolean;
+}
+
+export default function HotelDetails({ product, onAddToCart, addedToCart }: HotelDetailsProps) {
+  return (
+    <div className="space-y-6">
+      <div className="bg-gray-100 h-64 flex items-center justify-center rounded-lg">
+        <span className="text-gray-400">Hotel Image</span>
+      </div>
+
+      <div>
+        <h1 className="text-3xl font-bold mb-2">{product.name}</h1>
+        <p className="text-lg text-gray-600">{product.roomType}</p>
+      </div>
+
+      <div className="grid grid-cols-2 gap-4">
+        <div>
+          <h3 className="font-semibold mb-1">Check-in</h3>
+          <p>{product.checkIn}</p>
+        </div>
+        <div>
+          <h3 className="font-semibold mb-1">Check-out</h3>
+          <p>{product.checkOut}</p>
+        </div>
+      </div>
+
+      <div>
+        <h3 className="font-semibold mb-2">Amenities</h3>
+        <div className="flex flex-wrap gap-2">
+          {product.amenities.map(a => (
+            <span key={a} className="px-3 py-1 bg-blue-100 text-blue-800 rounded-full text-sm">
+              {a}
+            </span>
+          ))}
+        </div>
+      </div>
+
+      {product.refundable && (
+        <div className="bg-green-50 border border-green-200 rounded-lg p-4">
+          <p className="text-green-800 font-medium">Free cancellation available</p>
+        </div>
+      )}
+
+      <div className="border-t pt-4">
+        <div className="flex justify-between items-center">
+          <div>
+            <p className="text-sm text-gray-600">Price per night</p>
+            <p className="text-3xl font-bold">${product.pricePerNight}</p>
+            <p className="text-sm text-gray-500">
+              Total for {product.nights} night{product.nights > 1 ? 's' : ''}: ${product.pricePerNight * product.nights}
+            </p>
+          </div>
+        </div>
+      </div>
+
+      <div className="flex gap-4">
+        <button
+          onClick={onAddToCart}
+          disabled={addedToCart}
+          className="w-full px-6 py-3 bg-blue-600 hover:bg-blue-700 disabled:bg-green-600 text-white rounded-lg font-medium transition-colors"
+        >
+          {addedToCart ? 'Added to Cart!' : 'Add to Cart'}
+        </button>
+      </div>
+    </div>
+  );
+}

web/src/contexts/CartContext.tsx

@@ -0,0 +1,76 @@
+'use client';
+
+import { createContext, useContext, useState, useEffect, ReactNode } from 'react';
+
+export interface CartItem {
+  id: string;
+  type: 'hotel' | 'airline';
+  name: string;
+  price: number;
+  metadata: Record<string, unknown>;
+  dateIndex: number;
+}
+
+interface CartContextType {
+  items: CartItem[];
+  addItem: (item: CartItem) => void;
+  removeItem: (id: string) => void;
+  clearCart: () => void;
+  itemCount: number;
+}
+
+const CartContext = createContext<CartContextType | undefined>(undefined);
+
+const CART_KEY = 'phantom_cart';
+
+export const CartProvider = ({ children }: { children: ReactNode }) => {
+  const [items, setItems] = useState<CartItem[]>([]);
+  const [loaded, setLoaded] = useState(false);
+
+  // load cart from sessionStorage on mount
+  useEffect(() => {
+    const stored = sessionStorage.getItem(CART_KEY);
+    if (stored) {
+      try {
+        setItems(JSON.parse(stored));
+      } catch (e) {
+        console.error('[CART_LOAD]', e);
+      }
+    }
+    setLoaded(true);
+  }, []);
+
+  // persist to sessionStorage whenever cart changes
+  useEffect(() => {
+    if (!loaded) return;
+    sessionStorage.setItem(CART_KEY, JSON.stringify(items));
+  }, [items, loaded]);
+
+  const addItem = (item: CartItem) => {
+    setItems(prev => {
+      // prevent duplicates
+      if (prev.find(i => i.id === item.id)) return prev;
+      return [...prev, item];
+    });
+  };
+
+  const removeItem = (id: string) => {
+    setItems(prev => prev.filter(i => i.id !== id));
+  };
+
+  const clearCart = () => {
+    setItems([]);
+  };
+
+  return (
+    <CartContext.Provider value={{ items, addItem, removeItem, clearCart, itemCount: items.length }}>
+      {children}
+    </CartContext.Provider>
+  );
+};
+
+export const useCart = () => {
+  const ctx = useContext(CartContext);
+  if (!ctx) throw new Error('useCart must be used within CartProvider');
+  return ctx;
+};

web/src/lib/product-utils.ts

@@ -0,0 +1,25 @@
+import { HotelProduct, Hotel, transformProduct as transformHotel } from './hotel-utils';
+import { AirlineProduct, Flight, transformProduct as transformFlight } from './airline-utils';
+
+export type Product = Hotel | Flight;
+export type ProductRaw = HotelProduct | AirlineProduct;
+
+export const isHotelProduct = (p: ProductRaw): p is HotelProduct => {
+  return 'room_type' in p;
+};
+
+export const isAirlineProduct = (p: ProductRaw): p is AirlineProduct => {
+  return 'flight_type' in p;
+};
+
+export const transformProduct = (p: ProductRaw): Product => {
+  if (isHotelProduct(p)) {
+    return transformHotel(p);
+  }
+  return transformFlight(p);
+};
+
+export const getProductType = (p: Product): 'hotel' | 'airline' => {
+  if ('roomType' in p) return 'hotel';
+  return 'airline';
+};

web/src/proxy.ts

@@ -11,6 +11,7 @@ export function proxy(req: NextRequest) {
         pathname.startsWith('/_next') ||
         pathname.startsWith('/static') ||
         pathname.startsWith('/start-task') ||
+        pathname.startsWith('/cart') ||
         pathname.includes('.')
         // TODO: add robots.txt and sitemap.xml if needed here
     ) {