import java.util.Scanner;

/**
 * This class implements a flowchart to help the user decided whether
 * or not they need to file taxes.
 * 
 * This class illustrates:
 * - The use of nested conditionals
 * - The use of private methods
 * 
 * @author alchambers
 * @version Fall2015
 */
public class TaxHelper{
    private Scanner scan;

    /**
     * Creates a new tax helper
     */
    public TaxHelper(){
        scan = new Scanner(System.in);
        printWelcomeMessage();   
    }

    /**
     * Helps the user determine whether or not they need to file taxes
     * This method is 101 lines of code long!
     */
    public void determineFilingStatus(){
        boolean isYes = questionAnswer("Are you single? (y/n)");

        // Single
        if(isYes){
            isYes = questionAnswer("Are you under 65 years of age?");
            askFinalIncomeQuestion(isYes, 8450, 9700);
        }

        // Married
        else{
            isYes = questionAnswer("Are you and your spouse both over 65?");

            // Over 65
            if(isYes){
                printTaxStatus(23000);
            }
            // At least one person is under 65
            else{
                isYes = questionAnswer("Are you and your spouse both under 65?");
                askFinalIncomeQuestion(isYes, 20600, 21800);
            }
        }
    }

    /*================================================================
     *              Below are the private helper methods
     *================================================================*/ 

    /**
     * Asks the final question in the flow chart which is always
     * related to the user's income level
     */
    private void askFinalIncomeQuestion(boolean isYes, int income1, int income2){
        if(isYes){
            printTaxStatus(income1);
        }
        else{
            printTaxStatus(income2);               
        }
    }

    
    /**
     * Prints a question to the screen and then scans and returns
     * the user's answer
     */
    private boolean questionAnswer(String question){
        System.out.println(question);
        String input = scan.nextLine();
        boolean answer = input.equals("y");
        return answer;
    }

    /**
     * Prints the final decision based upon income
     */
    private void printTaxStatus(int income){
        boolean isYes = questionAnswer("Is your gross income less than $" + income + "?");

        // Less than income threshold
        if(isYes){
            System.out.println("No, you do not need to file taxes");
        }

        // More than income threshold
        else{
            System.out.println("Yes, you must file taxes");
        }  

    }

    /**
     * Prints a welcome message to the user
     */
    private void printWelcomeMessage(){
        System.out.println("=======================================");
        System.out.println("Welcome to the Tax Center!");
        System.out.println("We offer non-professional tax help.");
        System.out.println("Use at your own risk!");
        System.out.println("=======================================");        
        System.out.println();
    }
}