segregate files

pedi-foods/Sources/PediFoods/State/AppState.swift

@@ -41,13 +41,81 @@ struct FavoritesState {
 }
 
 struct CartState {
+    var storeId: String? = nil
+    var storeName: String? = nil
     var items: [CartItemState] = []
     var total: Double = 0
 }
 
 struct CartItemState: Identifiable {
     let id: String
+    var productId: String
+    var storeId: String
     var name: String
+    var details: String? = nil
     var quantity: Int
-    var price: Double
+    var unitPrice: Double
+}
+
+extension CartState {
+    var totalItems: Int {
+        items.reduce(0) { $0 + $1.quantity }
+    }
+
+    mutating func recalculateTotal() {
+        total = items.reduce(0) { $0 + (Double($1.quantity) * $1.unitPrice) }
+    }
+
+    mutating func clear() {
+        storeId = nil
+        storeName = nil
+        items = []
+        total = 0
+    }
+
+    mutating func add(item: CartItemState) {
+        if let index = items.firstIndex(where: { $0.id == item.id }) {
+            items[index].quantity += item.quantity
+        } else {
+            items.append(item)
+        }
+        recalculateTotal()
+    }
+
+    mutating func set(item: CartItemState) {
+        if let index = items.firstIndex(where: { $0.id == item.id }) {
+            if item.quantity <= 0 {
+                items.remove(at: index)
+            } else {
+                items[index] = item
+            }
+        } else if item.quantity > 0 {
+            items.append(item)
+        }
+
+        if items.isEmpty {
+            storeId = nil
+            storeName = nil
+        }
+        recalculateTotal()
+    }
+
+    mutating func increment(itemId: String) {
+        guard let index = items.firstIndex(where: { $0.id == itemId }) else { return }
+        items[index].quantity += 1
+        recalculateTotal()
+    }
+
+    mutating func decrement(itemId: String) {
+        guard let index = items.firstIndex(where: { $0.id == itemId }) else { return }
+        items[index].quantity -= 1
+        if items[index].quantity <= 0 {
+            items.remove(at: index)
+        }
+        if items.isEmpty {
+            storeId = nil
+            storeName = nil
+        }
+        recalculateTotal()
+    }
 }