feat: Implement order creation functionality

- Add OrdersController for handling order creation requests.
- Create NewOrderDTO and OrderItems DTOs for order data.
- Define Orders model with persistence capabilities.
- Implement OrdersService for business logic of order creation.
- Introduce OrdersStatus enum for order states.
- Create OrdersRepository for data access.
- Add Flyway migration script to create the orders table.

src/main/java/com/vegamarket/orderservice/controller/OrdersController.java

@@ -0,0 +1,24 @@
+package com.vegamarket.orderservice.controller;
+
+import com.vegamarket.orderservice.dtos.NewOrderDTO;
+import com.vegamarket.orderservice.model.Orders;
+import com.vegamarket.orderservice.services.OrdersService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/orders")
+@RequiredArgsConstructor
+public class OrdersController {
+    private final OrdersService ordersService;
+
+    @PostMapping
+    public ResponseEntity<Orders> create(@RequestBody NewOrderDTO createDTO) {
+       return new ResponseEntity<>(ordersService.createOrder(createDTO), HttpStatus.CREATED);
+    }
+}

src/main/java/com/vegamarket/orderservice/dtos/NewOrderDTO.java

@@ -0,0 +1,9 @@
+package com.vegamarket.orderservice.dtos;
+
+import java.util.List;
+
+public record NewOrderDTO(
+        Long customerId,
+    List<OrderItems> items
+) {
+}

src/main/java/com/vegamarket/orderservice/dtos/OrderItems.java

@@ -0,0 +1,16 @@
+package com.vegamarket.orderservice.dtos;
+
+import lombok.*;
+
+import java.math.BigDecimal;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+public class OrderItems {
+
+    private String name;
+    private BigDecimal price;
+}

src/main/java/com/vegamarket/orderservice/enums/OrdersStatus.java

@@ -0,0 +1,9 @@
+package com.vegamarket.orderservice.enums;
+
+public enum OrdersStatus {
+    CREATED,
+    PAYMENT_PENDING,
+    PAID,
+    FAILED,
+    CANCELED,
+}

src/main/java/com/vegamarket/orderservice/model/Orders.java

@@ -0,0 +1,46 @@
+package com.vegamarket.orderservice.model;
+
+import com.vegamarket.orderservice.dtos.OrderItems;
+import com.vegamarket.orderservice.enums.OrdersStatus;
+import jakarta.persistence.*;
+import lombok.*;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.JdbcType;
+import org.hibernate.annotations.JdbcTypeCode;
+import org.hibernate.annotations.UpdateTimestamp;
+import org.hibernate.type.SqlTypes;
+
+import java.math.BigDecimal;
+import java.sql.Timestamp;
+import java.util.List;
+import java.util.Map;
+
+@Entity
+@Table(name = "orders")
+@AllArgsConstructor
+@NoArgsConstructor
+@Setter
+@Getter
+@Builder
+public class Orders {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long orderId;
+    private Long customerId;
+
+    @Enumerated(EnumType.STRING)
+    private OrdersStatus status;
+    private BigDecimal totalAmount;
+    private String traceId;
+
+    @Column(columnDefinition = "jsonb", nullable = false)
+    @JdbcTypeCode(SqlTypes.JSON)
+    private List<OrderItems> items;
+
+    @CreationTimestamp
+    private Timestamp createdAt;
+
+    @UpdateTimestamp
+    private Timestamp updatedAt;
+}

src/main/java/com/vegamarket/orderservice/model/OrdersRepository.java

@@ -0,0 +1,6 @@
+package com.vegamarket.orderservice.model;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface OrdersRepository extends JpaRepository<Orders, Long> {
+}

src/main/java/com/vegamarket/orderservice/services/OrdersService.java

@@ -0,0 +1,42 @@
+package com.vegamarket.orderservice.services;
+
+import com.vegamarket.orderservice.dtos.NewOrderDTO;
+import com.vegamarket.orderservice.dtos.OrderItems;
+import com.vegamarket.orderservice.enums.OrdersStatus;
+import com.vegamarket.orderservice.model.Orders;
+import com.vegamarket.orderservice.model.OrdersRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.math.BigDecimal;
+import java.sql.Timestamp;
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+public class OrdersService {
+
+    private final OrdersRepository ordersRepository;
+
+    public Orders createOrder(NewOrderDTO createDTO) {
+        Orders order = Orders.builder()
+                .customerId(createDTO.customerId())
+                .status(OrdersStatus.CREATED)
+                .totalAmount(getTotalAmount(createDTO.items()))
+                .traceId("request_" + new Timestamp(System.currentTimeMillis()))
+                .items(createDTO.items())
+                .build();
+
+        order = ordersRepository.save(order);
+        return order;
+    }
+
+    private BigDecimal getTotalAmount(List<OrderItems> items) {
+        BigDecimal totalAmount = BigDecimal.ZERO;
+        for (OrderItems item : items) {
+            totalAmount = totalAmount.add(item.getPrice());
+        }
+
+        return totalAmount;
+    }
+}

src/main/resources/db/migration/V1__CREATE-ORDERS-TABLE.sql

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+create table orders (
+    order_id bigint generated always as identity primary key,
+    customer_id bigint not null,
+    status text not null,
+    total_amount numeric(19,2) not null,
+    trace_id varchar(31) not null,
+    items jsonb not null,
+    created_at timestamp not null,
+    updated_at timestamp not null
+);