added creating products

lib/client.dart

@@ -219,4 +219,19 @@ class ApiClient {
       "order": order,
     });
   }
+
+  Future<Map<String, dynamic>> addProduct({
+    required String name,
+    required double protein,
+    required double carb,
+    required double fat,
+  }) async {
+    var response = await post("/product", {
+      "name": name,
+      "protein": protein,
+      "carb": carb,
+      "fat": fat,
+    });
+    return response;
+  }
 }

lib/screens/add_entry.dart

@@ -5,6 +5,7 @@ import 'package:fooder_web/models/product.dart';
 import 'package:fooder_web/models/diary.dart';
 import 'package:fooder_web/models/meal.dart';
 import 'package:fooder_web/widgets/product.dart';
+import 'package:fooder_web/screens/add_product.dart';
 
 
 class AddEntryScreen extends BasedScreen {
@@ -132,6 +133,27 @@ class _AddEntryScreen extends State<AddEntryScreen> {
                 controller: productNameController,
                 onChanged: (_) => _getProducts(),
               ),
+              TextButton(
+                onPressed: () {
+                  Navigator.push(
+                    context,
+                    MaterialPageRoute(
+                      builder: (context) => AddProductScreen(
+                        apiClient: widget.apiClient,
+                      ),
+                    ),
+                  ).then((product) {
+                    if (product == null) {
+                      return;
+                    }
+                    setState(() {
+                      products = [product];
+                      productNameController.text = product.name;
+                    });
+                  });
+                },
+                child: const Text("Don't see your product? Add it!"),
+              ),
               for (var product in products)
                 ListTile(
                 onTap: () {

lib/screens/add_product.dart

@@ -0,0 +1,180 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:fooder_web/screens/based.dart';
+import 'package:fooder_web/models/product.dart';
+
+
+class AddProductScreen extends BasedScreen {
+  const AddProductScreen({super.key, required super.apiClient});
+
+  @override
+  State<AddProductScreen> createState() => _AddProductScreen();
+}
+
+
+class _AddProductScreen extends State<AddProductScreen> {
+  final nameController = TextEditingController();
+  final carbController = TextEditingController();
+  final fatController = TextEditingController();
+  final proteinController = TextEditingController();
+
+  @override
+  void dispose() {
+    nameController.dispose();
+    carbController.dispose();
+    fatController.dispose();
+    proteinController.dispose();
+    super.dispose();
+  }
+
+  void popMeDady(Product product) {
+    Navigator.pop(
+      context,
+      product,
+    );
+  }
+
+  void showError(String message)
+  {
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(message, textAlign: TextAlign.center),
+        backgroundColor: Theme.of(context).colorScheme.error,
+      ),
+    );
+  }
+
+  Future<void> _addProduct() async {
+    try {
+      double.parse(carbController.text);
+    } catch (e) {
+      showError("Carbs must be a number");
+      return;
+    }
+
+    try {
+      double.parse(fatController.text);
+    } catch (e) {
+      showError("Fat must be a number");
+      return;
+    }
+
+    try {
+      double.parse(proteinController.text);
+    } catch (e) {
+      showError("Protein must be a number");
+      return;
+    }
+
+    try {
+      var productJson = await widget.apiClient.addProduct(
+        carb: double.parse(carbController.text),
+        fat: double.parse(fatController.text),
+        protein: double.parse(proteinController.text),
+        name: nameController.text,
+      );
+      var product = Product.fromJson(productJson);
+      popMeDady(product);
+    } catch (e) {
+      showError("Error adding product, make sure there is no product with the same name");
+      return;
+    }
+  }
+
+  double calculateCalories() {
+    double calories = 0;
+
+    try {
+      calories += double.parse(carbController.text) * 4;
+    } catch (e) {
+      // ignore
+    }
+
+    try {
+      calories += double.parse(fatController.text) * 9;
+    } catch (e) {
+      // ignore
+    }
+
+    try {
+      calories += double.parse(proteinController.text) * 4;
+    } catch (e) {
+      // ignore
+    }
+
+    return calories;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text("🅵🅾🅾🅳🅴🆁"),
+      ),
+      body: Center(
+        child: Container(
+          constraints: const BoxConstraints(maxWidth: 720),
+          padding: const EdgeInsets.all(10),
+          child: Column(
+            children: <Widget>[
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Product name',
+                ),
+                controller: nameController,
+              ),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Carbs',
+                ),
+                keyboardType:const TextInputType.numberWithOptions(decimal: true),
+                inputFormatters: <TextInputFormatter>[
+                  FilteringTextInputFormatter.allow(RegExp(r'^(\d+)?\.?\d{0,2}')),
+                ],
+                controller: carbController,
+                onChanged: (String value) {
+                  setState(() {});
+                },
+              ),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Fat',
+                ),
+                keyboardType:const TextInputType.numberWithOptions(decimal: true),
+                inputFormatters: <TextInputFormatter>[
+                  FilteringTextInputFormatter.allow(RegExp(r'^(\d+)?\.?\d{0,2}')),
+                ],
+                controller: fatController,
+                onChanged: (String value) {
+                  setState(() {});
+                },
+              ),
+              TextFormField(
+                decoration: const InputDecoration(
+                  labelText: 'Protein',
+                ),
+                keyboardType:const TextInputType.numberWithOptions(decimal: true),
+                inputFormatters: <TextInputFormatter>[
+                  FilteringTextInputFormatter.allow(RegExp(r'^(\d+)?\.?\d{0,2}')),
+                ],
+                controller: proteinController,
+                onChanged: (String value) {
+                  setState(() {});
+                },
+              ),
+              Text(
+                "${calculateCalories()} kcal",
+                textAlign: TextAlign.right,
+              ),
+            ]
+          )
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: _addProduct,
+        child: const Icon(Icons.add),
+      ),
+    );
+  }
+}

lib/screens/edit_entry.dart

@@ -4,7 +4,7 @@ import 'package:fooder_web/screens/based.dart';
 import 'package:fooder_web/models/product.dart';
 import 'package:fooder_web/models/entry.dart';
 import 'package:fooder_web/widgets/product.dart';
-import 'package:fooder_web/models/meal.dart';
+import 'package:fooder_web/screens/add_product.dart';
 
 
 class EditEntryScreen extends BasedScreen {
@@ -118,6 +118,27 @@ class _EditEntryScreen extends State<EditEntryScreen> {
                 controller: productNameController,
                 onChanged: (_) => _getProducts(),
               ),
+              TextButton(
+                onPressed: () {
+                  Navigator.push(
+                    context,
+                    MaterialPageRoute(
+                      builder: (context) => AddProductScreen(
+                        apiClient: widget.apiClient,
+                      ),
+                    ),
+                  ).then((product) {
+                    if (product == null) {
+                      return;
+                    }
+                    setState(() {
+                      products = [product];
+                      productNameController.text = product.name;
+                    });
+                  });
+                },
+                child: const Text("Don't see your product? Add it!"),
+              ),
               for (var product in products)
                 ListTile(
                 onTap: () {