Compass app (#2446)

compass_app/server/lib/routes/booking.dart

@@ -0,0 +1,116 @@
+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+
+import 'package:collection/collection.dart';
+import 'package:shelf/shelf.dart';
+import 'package:shelf_router/shelf_router.dart';
+
+import '../config/assets.dart';
+import '../model/booking/booking.dart';
+
+/// Allows the user to save and restore bookings.
+///
+/// Bookings are stored in memory for demo purposes,
+/// so they are lost when the server stops.
+///
+/// For demo purposes, this API includes a default pre-generated booking.
+///
+/// The [Booking.id] is also the index in the bookings list.
+class BookingApi {
+  BookingApi() {
+    // Create a default booking
+    var destination = Assets.destinations.first;
+    final activitiesRef = Assets.activities
+        .where((activity) => activity.destinationRef == destination.ref)
+        .map((activity) => activity.ref)
+        .toList();
+    _bookings.add(
+      Booking(
+        id: _sequentialId++,
+        name: '${destination.name}, ${destination.continent}',
+        startDate: DateTime(2024, 7, 20),
+        endDate: DateTime(2024, 8, 15),
+        destinationRef: destination.ref,
+        activitiesRef: activitiesRef,
+      ),
+    );
+  }
+
+  // Bookings are kept in memory for demo purposes.
+  // To keep things simple, the id is also the index in the list.
+  final List<Booking> _bookings = List.empty(growable: true);
+
+  // Used to generate IDs for bookings
+  int _sequentialId = 0;
+
+  Router get router {
+    final router = Router();
+
+    // Get User bookings
+    router.get('/', (Request request) {
+      return Response.ok(
+        json.encode(_bookings),
+        headers: {'Content-Type': 'application/json'},
+      );
+    });
+
+    // Get a booking by id
+    router.get('/<id>', (Request request, String id) {
+      final bookingId = int.parse(id);
+      final booking =
+          _bookings.firstWhereOrNull((booking) => booking.id == bookingId);
+
+      if (booking == null) {
+        return Response.notFound('Invalid id');
+      }
+
+      return Response.ok(
+        json.encode(booking),
+        headers: {'Content-Type': 'application/json'},
+      );
+    });
+
+    // Save a new booking
+    router.post('/', (Request request) async {
+      final body = await request.readAsString();
+      final booking = Booking.fromJson(json.decode(body));
+
+      if (booking.id != null) {
+        // POST endpoint only allows newly created bookings
+        return Response.badRequest(
+            body: 'Booking already has id, use PUT instead.');
+      }
+
+      // Add ID to new booking
+      final bookingWithId = booking.copyWith(id: _sequentialId++);
+
+      // Store booking
+      _bookings.add(bookingWithId);
+
+      // Respond with newly created booking
+      return Response(
+        201, // created
+        body: json.encode(bookingWithId),
+        headers: {'Content-Type': 'application/json'},
+      );
+    });
+
+    // Delete booking
+    router.delete('/<id>', (Request request, String id) async {
+      final bookingId = int.parse(id);
+      final booking =
+          _bookings.firstWhereOrNull((booking) => booking.id == bookingId);
+      if (booking == null) {
+        return Response.notFound('Invalid id');
+      }
+      _bookings.remove(booking);
+      // 240: no content
+      return Response(204);
+    });
+
+    return router;
+  }
+}