/**
     * This class contains a method that finds the richest account in an array
     *
     * @author Akash Lagad
     */
    class Lab10Exercise3
    {
            public static void main(String[] args)
            {
                    testNormal();
                    testEmpty();
            }


            /**
             * Perform a basic test in the scenario with an array with many accounts
             */
            public static void testNormal()
            {
                    // Make an array of accounts
                    Account[] accounts = makeAccounts();

                    // Use the method which finds the richest account,
                    // and print results to screen
                    testMethodAndPrint(accounts);
            }


            /**
             * Perform a basic test in the scenario with an empty array
             */
            public static void testEmpty()
            {
                    // Make an array of length 0;
                    // This is an empty array containing no accounts
                    Account[] accounts = new Account[0];

                    // Use the method which finds the richest account,
                    // and print results to screen
                    testMethodAndPrint(accounts);
            }


            /**
             * Returns an array of accounts
             */
            public static Account[] makeAccounts()
            {
                    // Make 6 Account objects belonging to 6 different people
                    Account a1 = new Account("Adam");
                    Account a2 = new Account("Betty");
                    Account a3 = new Account("Charlie");
                    Account a4 = new Account("Diana");
                    Account a5 = new Account("Ed");
                    Account a6 = new Account("Fiona");

                    // Add some money into each account
                    a1.deposit(200);
                    a2.deposit(900);
                    a3.deposit(400);
                    a4.deposit(100);
                    a5.deposit(1000);
                    a6.deposit(400);

                    // Make an array to store these Account objects
                    Account[] accounts = new Account[6];

                    // Put the accounts into the array
                    accounts[0] = a1;
                    accounts[1] = a2;
                    accounts[2] = a3;
                    accounts[3] = a4;
                    accounts[4] = a5;
                    accounts[5] = a6;

                    // Return the array of accounts
                    return accounts;
            }


            /**
             * Call the findRichestAccount method and then print out the details
             * of the returned Account
             */
            public static void testMethodAndPrint(Account[] accounts)
            {
                    // Use the method which finds the richest account
                    Account richestAccount = findRichestAccount(accounts);
                    if(richestAccount!=null)
                    {
                    System.out.println ("Owner is " + richestAccount.getOwner());
                    System.out.println ("Balance is " + richestAccount.getBalance());
                    }
                    else
                    {
                    System.out.println("There is no richest account because the array was empty");
                    }
            }

            /**
             * Returns the account with the greatest balance;
             * if there are no accounts in the given array, then null is returned;
             * if there are more than 1 richest account, then any one of these richest accounts may be returned
             */
            public static Account findRichestAccount(Account[] accounts)
            {
                    double currentLargest = 0;
                    Account currentLargestAccount = null;
                    if (accounts.length == 0)
                    {
                            return null;
                    }
                    for (int i = 0; i < accounts.length; i++)
                    {
                            if (accounts[i].getBalance() > currentLargest)
                            {
                                    currentLargest = accounts[i].getBalance();
                                    currentLargestAccount = accounts[i];
                            }
                    }
                    return currentLargestAccount;
            }
    }