Initial commit

Generated by create-expo-app 3.2.0.

store/cartStore.ts

@@ -0,0 +1,78 @@
+import { Product } from "@/utils/api";
+import { create } from "zustand";
+import { zustandStorage } from "@/store/mmkv";
+import { createJSONStorage, persist } from "zustand/middleware";
+
+export interface CartState {
+  products: Array<Product & { quantity: number }>;
+  addProduct: (product: Product) => void;
+  reduceProduct: (product: Product) => void;
+  clearCart: () => void;
+  total: number;
+  count: number;
+}
+
+const INITIAL_STATE = {
+  products: [],
+  total: 0,
+  count: 0,
+};
+
+const useCartStore = create<CartState>()(
+  persist(
+    (set) => ({
+      ...INITIAL_STATE,
+      addProduct: (product) => {
+        set((state) => {
+          const hasProduct = state.products.find((p) => p.id === product.id);
+          const newTotal = +state.total.toFixed(2) + +product.price.toFixed(2);
+          const newCount = state.count + 1;
+
+          if (hasProduct) {
+            return {
+              products: state.products.map((p) =>
+                p.id === product.id ? { ...p, quantity: p.quantity + 1 } : p
+              ),
+              total: +newTotal.toFixed(2),
+              count: newCount,
+            };
+          } else {
+            return {
+              products: [...state.products, { ...product, quantity: 1 }],
+              total: +newTotal.toFixed(2),
+              count: newCount,
+            };
+          }
+        });
+      },
+      reduceProduct: (product) => {
+        set((state) => {
+          const newTotal = +state.total.toFixed(2) - +product.price.toFixed(2);
+          const newCount = state.count - 1;
+
+          return {
+            products: state.products
+              .map((p) => {
+                if (p.id === product.id) {
+                  return { ...p, quantity: p.quantity - 1 };
+                }
+                return p;
+              })
+              .filter((p) => p.quantity > 0),
+            total: newTotal,
+            count: newCount,
+          };
+        });
+      },
+      clearCart: () => {
+        set(INITIAL_STATE);
+      },
+    }),
+    {
+      name: "cart",
+      storage: createJSONStorage(() => zustandStorage),
+    }
+  )
+);
+
+export default useCartStore;