first commit

lib/Provider/add_to_cart_purchase.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_easyloading/flutter_easyloading.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:nb_utils/nb_utils.dart';
+
+import '../Screens/Purchase/Repo/purchase_repo.dart';
+import '../Screens/vat_&_tax/model/vat_model.dart';
+
+final cartNotifierPurchaseNew = ChangeNotifierProvider((ref) => CartNotifierPurchase());
+
+class CartNotifierPurchase extends ChangeNotifier {
+  List<CartProductModelPurchase> cartItemList = [];
+  TextEditingController discountTextControllerFlat = TextEditingController();
+  TextEditingController vatAmountController = TextEditingController();
+  TextEditingController shippingChargeController = TextEditingController();
+
+  ///_________NEW_________________________________
+  num totalAmount = 0;
+  num discountAmount = 0;
+  num discountPercent = 0;
+  num totalPayableAmount = 0;
+  VatModel? selectedVat;
+  num vatAmount = 0;
+  bool isFullPaid = false;
+  num receiveAmount = 0;
+  num changeAmount = 0;
+  num dueAmount = 0;
+  num finalShippingCharge = 0;
+
+  void changeSelectedVat({VatModel? data}) {
+    if (data != null) {
+      selectedVat = data;
+    } else {
+      selectedVat = null;
+      vatAmount = 0;
+      vatAmountController.clear();
+    }
+
+    calculatePrice();
+  }
+
+  void calculateDiscount({
+    required String value,
+    bool? rebuilding,
+    String? selectedTaxType,
+  }) {
+    if (value.isEmpty) {
+      discountAmount = 0;
+      discountPercent = 0;
+      discountTextControllerFlat.clear();
+    } else {
+      num discountValue = num.tryParse(value) ?? 0;
+
+      if (selectedTaxType == null) {
+        EasyLoading.showError('Please select a discount type');
+        discountAmount = 0;
+        discountPercent = 0;
+      } else if (selectedTaxType == "Flat") {
+        discountAmount = discountValue;
+
+        if (discountAmount > totalAmount) {
+          discountTextControllerFlat.clear();
+          discountAmount = 0;
+          EasyLoading.showError('Enter a valid discount');
+        }
+      } else if (selectedTaxType == "Percent") {
+        discountPercent = discountValue;
+        discountAmount = (totalAmount * discountPercent) / 100;
+
+        if (discountAmount > totalAmount) {
+          discountAmount = totalAmount;
+        }
+      } else {
+        EasyLoading.showError('Invalid discount type selected');
+        discountAmount = 0;
+      }
+    }
+
+    if (rebuilding == false) return;
+    calculatePrice();
+  }
+
+  void updateProduct({required int index, required CartProductModelPurchase newProduct}) {
+    cartItemList[index] = newProduct;
+    calculatePrice();
+  }
+
+  void calculatePrice({String? receivedAmount, String? shippingCharge, bool? stopRebuild}) {
+    totalAmount = 0;
+    totalPayableAmount = 0;
+    dueAmount = 0;
+    for (var element in cartItemList) {
+      totalAmount += (element.quantities ?? 0) * (element.productPurchasePrice ?? 0);
+    }
+    totalPayableAmount = totalAmount;
+
+    if (discountAmount > totalAmount) {
+      calculateDiscount(value: discountAmount.toString(), rebuilding: false);
+    }
+    if (discountAmount >= 0) {
+      totalPayableAmount -= discountAmount;
+    }
+    if (selectedVat?.rate != null) {
+      vatAmount = (totalPayableAmount * selectedVat!.rate!) / 100;
+      vatAmountController.text = vatAmount.toStringAsFixed(2);
+    }
+
+    totalPayableAmount += vatAmount;
+    if (shippingCharge != null) {
+      finalShippingCharge = num.tryParse(shippingCharge) ?? 0;
+    }
+    totalPayableAmount += finalShippingCharge;
+    if (receivedAmount != null) {
+      receiveAmount = num.tryParse(receivedAmount) ?? 0;
+    }
+    changeAmount = totalPayableAmount < receiveAmount ? receiveAmount - totalPayableAmount : 0;
+    dueAmount = totalPayableAmount < receiveAmount ? 0 : totalPayableAmount - receiveAmount;
+    if (dueAmount <= 0) isFullPaid = true;
+    if (stopRebuild ?? false) return;
+    notifyListeners();
+  }
+
+  double getTotalAmount() {
+    double totalAmountOfCart = 0;
+    for (var element in cartItemList) {
+      totalAmountOfCart = totalAmountOfCart + ((element.productPurchasePrice ?? 0) * (element.quantities ?? 0));
+    }
+
+    return totalAmountOfCart;
+  }
+
+  void quantityIncrease(int index) {
+    cartItemList[index].quantities = (cartItemList[index].quantities ?? 0) + 1;
+    calculatePrice();
+  }
+
+  void quantityDecrease(int index) {
+    if ((cartItemList[index].quantities ?? 0) > 1) {
+      cartItemList[index].quantities = (cartItemList[index].quantities ?? 0) - 1;
+    }
+    calculatePrice();
+  }
+
+  void addToCartRiverPod({required CartProductModelPurchase cartItem, bool? fromEditSales, required bool isVariation}) {
+    if (!cartItemList
+        .any((element) => isVariation ? (element.productId == cartItem.productId && element.batchNumber == cartItem.batchNumber) : element.productId == cartItem.productId)) {
+      cartItemList.add(cartItem);
+    } else {
+      int index = cartItemList.indexWhere(
+        (element) => isVariation ? (element.productId == cartItem.productId && element.batchNumber == cartItem.batchNumber) : element.productId == cartItem.productId,
+      );
+      cartItemList[index] = cartItem;
+    }
+    (fromEditSales ?? false) ? null : calculatePrice();
+  }
+
+  void deleteToCart(int index) {
+    cartItemList.removeAt(index);
+    calculatePrice();
+  }
+}