feat(backend): implemented the send money service

power-pay-backend/src/main/java/com/adorsys/gis/powerpay/powerpaybackend/errorhandling/InsufficientFundsException.java

@@ -0,0 +1,17 @@
+package com.adorsys.gis.powerpay.powerpaybackend.errorhandling;
+
+public class InsufficientFundsException extends RuntimeException {
+
+    private final String message;
+
+    public InsufficientFundsException(String message) {
+        super(message);
+        this.message = message;
+    }
+
+    @Override
+    public String getMessage() {
+        return message;
+    }
+}
+

power-pay-backend/src/main/java/com/adorsys/gis/powerpay/powerpaybackend/repository/MoneyTransferRepository.java

@@ -0,0 +1,9 @@
+package com.adorsys.gis.powerpay.powerpaybackend.repository;
+
+import com.adorsys.gis.powerpay.powerpaybackend.domain.Transaction;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface MoneyTransferRepository extends JpaRepository<Transaction, String> {
+}

power-pay-backend/src/main/java/com/adorsys/gis/powerpay/powerpaybackend/services/SendMoney.java

@@ -1,5 +1,8 @@
 package com.adorsys.gis.powerpay.powerpaybackend.services;
 
+import com.adorsys.gis.powerpay.powerpaybackend.domain.Transaction;
+
 //implementing an empty interface
 public interface SendMoney {
-}
+    Transaction send(String phoneNumber, String receiverPhoneNumber, Double amount, String currency, Integer id);
+}

power-pay-backend/src/main/java/com/adorsys/gis/powerpay/powerpaybackend/services/SendMoneyImpl.java

@@ -1,8 +1,55 @@
 package com.adorsys.gis.powerpay.powerpaybackend.services;
-
+import com.adorsys.gis.powerpay.powerpaybackend.domain.ProcedureStatus;
+import com.adorsys.gis.powerpay.powerpaybackend.domain.Transaction;
+import com.adorsys.gis.powerpay.powerpaybackend.errorhandling.InsufficientFundsException;
+import com.adorsys.gis.powerpay.powerpaybackend.repository.MoneyTransferRepository;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.TransactionException;
 
 @Service
 public class SendMoneyImpl implements SendMoney{
 
+    @Autowired
+    private MoneyTransferRepository moneyTransferRepository;
+
+
+    @Override
+    public Transaction send(String phoneNumber, String receiverPhoneNumber, Double amount, String currency, Integer id)
+            throws InsufficientFundsException, TransactionException {
+        if (phoneNumber == null) {
+            throw new IllegalArgumentException("Phone number cannot be null.");
+        }
+        if (amount <= 0) {
+            throw new IllegalArgumentException("Transfer amount must be positive.");
+        }
+
+        if (!hasSufficientFunds(phoneNumber, amount)) {
+            throw new InsufficientFundsException("Insufficient funds for transfer.");
+        }
+
+        Transaction transaction = new Transaction();
+        try {
+            if (transaction != null) {
+                transaction.setReceiverPhoneNumber(receiverPhoneNumber);
+                transaction.setAmount(amount);
+                transaction.setCurrency(currency);
+                transaction.setStatus(ProcedureStatus.WAITING);
+                transaction.setId(id);
+                transaction.setPhoneNumber(phoneNumber);
+
+                transaction = moneyTransferRepository.save(transaction);
+            }
+        } catch (Exception e) {
+            throw new TransactionException("Failed to save transaction: " + e.getMessage(), e) {
+            };
+        }
+
+        return transaction;
+    }
+
+    private boolean hasSufficientFunds(String phoneNumber, Double amount) {
+        return true;
+    }
+
 }

power-pay-backend/src/test/java/com/adorsys/gis/powerpay/powerpaybackend/services_tests/SendMoneyImplTest.java

@@ -0,0 +1,63 @@
+package com.adorsys.gis.powerpay.powerpaybackend.services_tests;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import org.junit.jupiter.api.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import com.adorsys.gis.powerpay.powerpaybackend.domain.Transaction;
+import com.adorsys.gis.powerpay.powerpaybackend.repository.MoneyTransferRepository;
+import com.adorsys.gis.powerpay.powerpaybackend.services.SendMoneyImpl;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class SendMoneyImplTest {
+
+    @Autowired
+    private SendMoneyImpl sendMoneyImpl;
+
+    @MockBean
+    private MoneyTransferRepository moneyTransferRepository;
+    @Test
+    public void testSend_NullPhoneNumber_ExceptionThrown() {
+        // Arrange
+
+        // Act & Assert
+        assertThrows(IllegalArgumentException.class, () -> {
+            sendMoneyImpl.send(null, "1234567890", 100.0, "XAF", 1);
+        });
+    }
+
+    @Test
+    public void testSend_NegativeAmount_ExceptionThrown() {
+        // Arrange
+
+        // Act & Assert
+        assertThrows(IllegalArgumentException.class, () -> {
+            sendMoneyImpl.send("1234567890", "0987654321", -100.0, "XAF", 1);
+        });
+    }
+
+    @Test
+    public void testSend_SuccessfulTransaction() {
+        // Arrange
+        Transaction awaitedTransaction = new Transaction();
+        when(moneyTransferRepository.save(Mockito.any(Transaction.class))).thenReturn(awaitedTransaction);
+        // Act
+        Transaction result = sendMoneyImpl.send("1234567890", "0987654321", 100.0, "XAF", 1);
+
+        // Assert
+        assertNotNull(result);
+
+        assertEquals(awaitedTransaction, result);
+
+    }
+
+
+}