feat: Add discount module with protobuf definitions and gRPC services

src/Protobufs/BackOffice.BFF.DiscountShoppingCart.Protobuf/Protos/discountshoppingcart.proto

@@ -0,0 +1,120 @@
+syntax = "proto3";
+
+package discountshoppingcart;
+
+import "public_messages.proto";
+import "google/protobuf/empty.proto";
+import "google/protobuf/wrappers.proto";
+import "google/protobuf/timestamp.proto";
+import "google/api/annotations.proto";
+
+option csharp_namespace = "BackOffice.BFF.DiscountShoppingCart.Protobuf.Protos.DiscountShoppingCart";
+
+service DiscountShoppingCartContract
+{
+    rpc AddToCart(AddToCartRequest) returns (AddToCartResponse){
+        option (google.api.http) = {
+            post: "/AddToCart"
+            body: "*"
+        };
+    };
+    rpc RemoveFromCart(RemoveFromCartRequest) returns (RemoveFromCartResponse){
+        option (google.api.http) = {
+            delete: "/RemoveFromCart"
+            body: "*"
+        };
+    };
+    rpc UpdateCartItemCount(UpdateCartItemCountRequest) returns (UpdateCartItemCountResponse){
+        option (google.api.http) = {
+            put: "/UpdateCartItemCount"
+            body: "*"
+        };
+    };
+    rpc GetUserCart(GetUserCartRequest) returns (GetUserCartResponse){
+        option (google.api.http) = {
+            get: "/GetUserCart"
+        };
+    };
+    rpc ClearCart(ClearCartRequest) returns (google.protobuf.Empty){
+        option (google.api.http) = {
+            delete: "/ClearCart"
+            body: "*"
+        };
+    };
+}
+
+// Add to Cart
+message AddToCartRequest
+{
+    int64 user_id = 1;
+    int64 product_id = 2;
+    int32 count = 3;
+}
+
+message AddToCartResponse
+{
+    bool success = 1;
+    string message = 2;
+}
+
+// Remove from Cart
+message RemoveFromCartRequest
+{
+    int64 user_id = 1;
+    int64 product_id = 2;
+}
+
+message RemoveFromCartResponse
+{
+    bool success = 1;
+    string message = 2;
+}
+
+// Update Cart Item Count
+message UpdateCartItemCountRequest
+{
+    int64 user_id = 1;
+    int64 product_id = 2;
+    int32 new_count = 3;
+}
+
+message UpdateCartItemCountResponse
+{
+    bool success = 1;
+    string message = 2;
+}
+
+// Get User Cart
+message GetUserCartRequest
+{
+    int64 user_id = 1;
+}
+
+message GetUserCartResponse
+{
+    repeated CartItemDto items = 1;
+    int64 total_price = 2;
+    int64 total_discount_amount = 3;
+    int64 final_price = 4;
+}
+
+message CartItemDto
+{
+    int64 product_id = 1;
+    string product_title = 2;
+    string product_image_path = 3;
+    int64 unit_price = 4;
+    int32 max_discount_percent = 5;
+    int32 count = 6;
+    int64 total_price = 7;
+    int64 discount_amount = 8;
+    int64 final_price = 9;
+    int32 product_remaining_count = 10;
+    google.protobuf.Timestamp created = 11;
+}
+
+// Clear Cart
+message ClearCartRequest
+{
+    int64 user_id = 1;
+}