feat: implement bank account system with audit logging and support fo…

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/AuditLog.java

@@ -0,0 +1,43 @@
+package com.codedifferently.lesson17.bank;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+
+public class AuditLog {
+  private final List<String> logEntries = new ArrayList<>();
+
+  public void logTransaction(BankAccount account, double amount, String transactionType) {
+    String entry =
+        String.format(
+            "%s transaction: %s | Amount: %.2f | Balance: %.2f",
+            transactionType, account.getAccountNumber(), amount, account.getBalance());
+    logEntries.add(entry);
+    System.out.println(
+        entry); // You can remove this line if you prefer logging to a file or database
+  }
+
+  public List<String> getLogEntries() {
+    return logEntries;
+  }
+
+  public void record(String message) {
+    String timestampedEntry = LocalDateTime.now() + " | " + message;
+    logEntries.add(timestampedEntry);
+    System.out.println(timestampedEntry); // Optional: For real-time feedback
+  }
+
+  public void printLog() {
+    System.out.println("Audit Log:");
+    for (String entry : logEntries) {
+      System.out.println(entry);
+    }
+  }
+
+  /**
+   * Records an audit log message.
+   *
+   * @param message The message to record.
+   */
+  // Removed duplicate method definition for record(String message)
+}

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/BankAccount.java

@@ -0,0 +1,131 @@
+package com.codedifferently.lesson17.bank;
+
+import com.codedifferently.lesson17.bank.exceptions.InsufficientFundsException;
+import java.util.Set;
+
+public class BankAccount {
+  protected String accountNumber;
+  protected Set<Customer> owners;
+  protected double balance;
+  protected boolean isActive;
+  private static final double LARGE_TRANSACTION_THRESHOLD = 5000.0;
+
+  public BankAccount(String accountNumber, Set<Customer> owners, double initialBalance) {
+    this.accountNumber = accountNumber;
+    this.owners = owners;
+    this.balance = initialBalance;
+    isActive = true;
+  }
+
+  /**
+   * Gets the account number.
+   *
+   * @return The account number.
+   */
+  public String getAccountNumber() {
+    return accountNumber;
+  }
+
+  /**
+   * Gets the owners of the account.
+   *
+   * @return The owners of the account.
+   */
+  public Set<Customer> getOwners() {
+    return owners;
+  }
+
+  /**
+   * Deposits funds into the account.
+   *
+   * @param amount The amount to deposit.
+   */
+  public void deposit(double amount) throws IllegalStateException {
+    if (isClosed()) {
+      throw new IllegalStateException("Cannot deposit to a closed account");
+    }
+    if (amount <= 0) {
+      throw new IllegalArgumentException("Deposit amount must be positive");
+    }
+    if (amount > LARGE_TRANSACTION_THRESHOLD) {
+      System.out.println("Warning: Large transaction detected for deposit.");
+    }
+    balance += amount;
+  }
+
+  // Withdraws funds from the account.
+
+  public void withdraw(double amount) throws InsufficientFundsException {
+    if (isClosed()) {
+      throw new IllegalStateException("Cannot withdraw from a closed account");
+    }
+    if (amount <= 0) {
+      throw new IllegalStateException("Withdrawal amount must be positive");
+    }
+    if (amount > LARGE_TRANSACTION_THRESHOLD) {
+      System.out.println("Warning: Large transaction detected for withdrawal.");
+    }
+    if (balance < amount) {
+      throw new InsufficientFundsException("Account does not have enough funds for withdrawal");
+    }
+    balance -= amount;
+  }
+
+  /**
+   * Checks if the account is active.
+   *
+   * @return True if the account is active, otherwise false.
+   */
+
+  /**
+   * Gets the balance of the account.
+   *
+   * @return The balance of the account.
+   */
+  public double getBalance() {
+    return balance;
+  }
+
+  /** Closes the account. */
+  public void closeAccount() throws IllegalStateException {
+    if (balance > 0) {
+      throw new IllegalStateException("Cannot close account with a positive balance");
+    }
+    isActive = false;
+  }
+
+  /**
+   * Checks if the account is closed.
+   *
+   * @return True if the account is closed, otherwise false.
+   */
+  public boolean isClosed() {
+    return !isActive;
+  }
+
+  @Override
+  public int hashCode() {
+    return accountNumber.hashCode();
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (obj instanceof BankAccount other) {
+      return accountNumber.equals(other.accountNumber);
+    }
+    return false;
+  }
+
+  @Override
+  public String toString() {
+    return "BnnkAccount{"
+        + "accountNumber='"
+        + accountNumber
+        + '\''
+        + ", balance="
+        + balance
+        + ", isActive="
+        + isActive
+        + '}';
+  }
+}

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/BankAtm.java

@@ -1,6 +1,8 @@
 package com.codedifferently.lesson17.bank;
 
 import com.codedifferently.lesson17.bank.exceptions.AccountNotFoundException;
+import com.codedifferently.lesson17.bank.exceptions.CheckVoidedException;
+import com.codedifferently.lesson17.bank.exceptions.InsufficientFundsException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
@@ -10,21 +12,17 @@
 public class BankAtm {
 
   private final Map<UUID, Customer> customerById = new HashMap<>();
-  private final Map<String, CheckingAccount> accountByNumber = new HashMap<>();
+  private final Map<String, BankAccount> accountByNumber = new HashMap<>();
+  private final AuditLog auditLog = new AuditLog();
 
   /**
    * Adds a checking account to the bank.
    *
    * @param account The account to add.
    */
-  public void addAccount(CheckingAccount account) {
+  public void addAccount(BankAccount account) {
     accountByNumber.put(account.getAccountNumber(), account);
-    account
-        .getOwners()
-        .forEach(
-            owner -> {
-              customerById.put(owner.getId(), owner);
-            });
+    account.getOwners().forEach(owner -> customerById.put(owner.getId(), owner));
   }
 
   /**
@@ -33,7 +31,7 @@ public void addAccount(CheckingAccount account) {
    * @param customerId The ID of the customer.
    * @return The unique set of accounts owned by the customer.
    */
-  public Set<CheckingAccount> findAccountsByCustomerId(UUID customerId) {
+  public Set<BankAccount> findAccountsByCustomerId(UUID customerId) {
     return customerById.containsKey(customerId)
         ? customerById.get(customerId).getAccounts()
         : Set.of();
@@ -46,8 +44,9 @@ public Set<CheckingAccount> findAccountsByCustomerId(UUID customerId) {
    * @param amount The amount to deposit.
    */
   public void depositFunds(String accountNumber, double amount) {
-    CheckingAccount account = getAccountOrThrow(accountNumber);
+    BankAccount account = getAccountOrThrow(accountNumber);
     account.deposit(amount);
+    auditLog.record("Deposited $" + amount + " to account " + accountNumber);
   }
 
   /**
@@ -56,9 +55,15 @@ public void depositFunds(String accountNumber, double amount) {
    * @param accountNumber The account number.
    * @param check The check to deposit.
    */
-  public void depositFunds(String accountNumber, Check check) {
-    CheckingAccount account = getAccountOrThrow(accountNumber);
+  public void depositFunds(String accountNumber, Check check) throws CheckVoidedException {
+    BankAccount account = getAccountOrThrow(accountNumber);
+
+    if (check.getIsVoided()) {
+      throw new CheckVoidedException("Check is voided");
+    }
+
     check.depositFunds(account);
+    auditLog.record("Deposited check of $" + check.getAmount() + " to account " + accountNumber);
   }
 
   /**
@@ -68,8 +73,24 @@ public void depositFunds(String accountNumber, Check check) {
    * @param amount
    */
   public void withdrawFunds(String accountNumber, double amount) {
-    CheckingAccount account = getAccountOrThrow(accountNumber);
+    BankAccount account = getAccountOrThrow(accountNumber);
     account.withdraw(amount);
+    auditLog.record("Withdrew $" + amount + " from account " + accountNumber);
+  }
+
+  /**
+   * Handles a money order transaction.
+   *
+   * @param moneyOrder The money order to process.
+   */
+  public void handleMoneyOrder(MoneyOrder moneyOrder) throws InsufficientFundsException {
+    BankAccount account = getAccountOrThrow(moneyOrder.getSourceAccount().getAccountNumber());
+    moneyOrder.process();
+    auditLog.record(
+        "Processed money order of $"
+            + moneyOrder.getAmount()
+            + " from account "
+            + account.getAccountNumber());
   }
 
   /**
@@ -78,8 +99,8 @@ public void withdrawFunds(String accountNumber, double amount) {
    * @param accountNumber The account number.
    * @return The account.
    */
-  private CheckingAccount getAccountOrThrow(String accountNumber) {
-    CheckingAccount account = accountByNumber.get(accountNumber);
+  private BankAccount getAccountOrThrow(String accountNumber) {
+    BankAccount account = accountByNumber.get(accountNumber);
     if (account == null || account.isClosed()) {
       throw new AccountNotFoundException("Account not found");
     }

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/BusinessCheckingAccount.java

@@ -0,0 +1,17 @@
+package com.codedifferently.lesson17.bank;
+
+import java.util.Set;
+
+public class BusinessCheckingAccount extends BankAccount {
+  private final boolean isBusiness;
+
+  public BusinessCheckingAccount(
+      String accountNumber, Set<Customer> owners, double initialBalance, boolean isBusiness) {
+    super(accountNumber, owners, initialBalance);
+    this.isBusiness = isBusiness;
+  }
+
+  public boolean isBusiness() {
+    return isBusiness;
+  }
+}

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/Check.java

@@ -1,6 +1,6 @@
 package com.codedifferently.lesson17.bank;
 
-import com.codedifferently.lesson17.bank.exceptions.CheckVoidedException;
+// Correct import
 
 /** Represents a check. */
 public class Check {
@@ -45,13 +45,14 @@ public void voidCheck() {
    *
    * @param toAccount The account to deposit the check into.
    */
-  public void depositFunds(CheckingAccount toAccount) {
-    if (isVoided) {
-      throw new CheckVoidedException("Check is voided");
+  public void depositFunds(BankAccount account) {
+    if (account instanceof SavingsAccount) {
+      throw new UnsupportedOperationException("Cannot deposit checks into a savings account");
     }
-    account.withdraw(amount);
-    toAccount.deposit(amount);
-    voidCheck();
+    if (account == null) {
+      throw new IllegalArgumentException("Account cannot be null");
+    }
+    account.deposit(amount);
   }
 
   @Override
@@ -79,4 +80,13 @@ public String toString() {
         + account.getAccountNumber()
         + '}';
   }
+
+  /**
+   * Gets the check number.
+   *
+   * @return The check number.
+   */
+  public double getAmount() {
+    return amount;
+  }
 }