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src/main/java/eu/greyson/JavaTestRefactor/JavaTestRefactorApplication.java

+package eu.greyson.JavaTestRefactor;
+
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.boot.Banner;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.math.BigDecimal;
+import java.util.HashMap;
+import java.util.Map;
+
+@SpringBootApplication
+public class JavaTestRefactorApplication implements CommandLineRunner {
+
+	public static final String QUIT = "quit";
+	public static final String INPUT = "Input > ";
+	public static final String SEPARATOR = "=================================================";
+	public static final String HEADER = "Payment Tracker application";
+	public static final String VALIDATION_EXIT = "Exiting application.";
+	public static final String VALIDATION_INVALID_INPUT = "Invalid input: ";
+	public static final String VALIDATION_3_LETTERS = "Invalid input. Currency must be 3 letters !";
+	public static final String VALIDATION_AMOUNT_NUMBER = "Invalid input. Amount must consit of only numbers!";
+
+	Boolean isReading = true;
+
+	private Map<String, BigDecimal> paymentMap = new HashMap<>();
+
+	Validate validate = new Validate();
+
+
+	public static void main(String[] args) {
+		SpringApplication app = new SpringApplication(JavaTestRefactorApplication.class);
+		app.setBannerMode(Banner.Mode.OFF);
+		app.setLogStartupInfo(false);
+		app.run(args);
+	}
+
+	@Override
+	public void run(String... args) {
+		trackerService();
+	}
+
+	private void trackerService() {
+		System.out.println(SEPARATOR + "\n" + HEADER + "\n" + SEPARATOR);
+		BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
+
+		// fileName argument check, if true try to read file
+
+		while (isReading) {
+			String input = readInput(bufferedReader);
+			Payment payment = parsePayment(input);
+
+			if (payment != null) {
+				processPayment(payment);
+			}
+
+
+			System.out.println("\n\n=== Actual balances:"+getNetCurrencies());
+		}
+
+		System.out.println(SEPARATOR + "\n" + VALIDATION_EXIT);
+	}
+
+	public String readInput(BufferedReader bufferedReader) {
+		System.out.print(INPUT);
+		String inputLine = null;
+
+		try {
+			inputLine = bufferedReader.readLine();
+
+			//TODO add input validation for -h to show usage and basic validation
+			if (QUIT.equals(inputLine.toLowerCase())) {
+				isReading = false;
+				return QUIT;
+			}
+
+			return inputLine;
+
+		} catch (Exception e) {
+			System.out.println(VALIDATION_INVALID_INPUT + inputLine);
+			return null;
+		}
+	}
+
+	public Payment parsePayment(String payment) {
+		if (validate.isValidInputFormat(payment)) {
+			String[] paymentSplit = payment.split(" ");
+			return new Payment(paymentSplit[0].toUpperCase(), paymentSplit[1]);
+		}
+		return null;
+	}
+
+	public void processPayment(Payment payment) {
+		String curenncy = payment.getCurrency();
+		BigDecimal amount = paymentMap.get(payment.getCurrency());
+
+		if (amount != null) {
+			paymentMap.put(curenncy, amount.add(payment.getAmount()));
+			System.out.print(" (Updated)");
+		} else {
+			paymentMap.put(curenncy, payment.getAmount());
+			System.out.print(" (Added new Currency:"+ curenncy);
+		}
+	}
+
+	public String getNetCurrencies() {
+		StringBuilder builder = new StringBuilder();
+		builder.append("\n");
+		paymentMap.forEach((k, v) -> {
+			if (v != BigDecimal.ZERO) {
+				builder.append("> "+k + " " + v + "\n");
+			}
+		});
+
+		if (StringUtils.isBlank(builder.toString())) {
+			return "";
+		}
+
+		return builder.toString();
+	}
+}
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