//Jacob Baker
//Lab-03
//StartA.java
//AKA "An Even 'SLICKER' Method Than the Methods Used in Parts B & C"   :)
public class StartA {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        // test methods here:
//      Magic.println(computeTaxes(500000));
        int userIncome = StartD.promptUserGetInt("Enter your Taxable Income");
        Magic.println("You owe this much in federal income taxes: $" + computeTaxes(userIncome));

    }// end main


    //let "double userIncome" take place of the parameter name "taxableIncome"
    public static double computeTaxes(double userIncome) {
        // two arrays whose positions correspond in Marginal Tax Rate and Taxable Income
        double[] taxRate = { 0.10, 0.15, 0.25, 0.28, 0.33, 0.35, 0.396 };
        double[] taxableIncome = { 9275.00, 37650.00, 91150.00, 190150.00, 413350.00, 415050.00, 415050.01 };
        double totalTaxes = 0;
        double lastTaxes = 0;
        //this boolean is used to break the main loop from inside the nested loop
        boolean breakMainLoop = true;

        //condition specific for userIncome > taxableIncome[6]
        if (userIncome >= taxableIncome[6]) {
            for (int i = 0; i < taxableIncome.length && breakMainLoop == true; i++) {

                if (i == 6) {
                    lastTaxes += (taxRate[i] * (userIncome - taxableIncome[i]));
                    totalTaxes += lastTaxes;
                    Magic.println(totalTaxes);

                    breakMainLoop = false;
                } else if (i > 0) {
                    totalTaxes += (taxRate[i] * (taxableIncome[i] - taxableIncome[i - 1]));
                } else if (i == 0) {
                    totalTaxes += taxRate[i] * taxableIncome[i];
                }
            }
        } else {
            //conditions for any userIncome that is less than taxableIncome[6]
            //this loop runs the taxableIncome array elements into the corresponding "if" statement
            for (int i = 0; i < taxableIncome.length && breakMainLoop == true; i++) {
                if (userIncome >= taxableIncome[i]) {
                    //this loop runs numbers through corresponding conditionals to determine "totalTaxes"
                    for (int j = 0; userIncome >= taxableIncome[j]; j++) {
                        if (j > 0) {
                            //follows the formula given in the example of the lab instructions
                            totalTaxes += (taxRate[j] * (taxableIncome[j] - taxableIncome[j - 1]));

                            //checks to see if the next element in the array greater than "userIncome"
                            if (userIncome < taxableIncome[j + 1]) {
                                //if true, follow the last operation found in the formula example of the lab instructions through this equation
                                lastTaxes += taxRate[j + 1] * (userIncome - taxableIncome[j]);
                                //add it on to the taxes totaled from previous positions
                                totalTaxes += lastTaxes;
                                Magic.println(totalTaxes);

                                //if the next element in the array is greater, then break the main loop
                                breakMainLoop = false;
                            }

                        } else if (j == 0) {
                            //specific for taxable income <= 9752.00
                            //value is saved in "totalTaxes" and is run back through the loop to carry on thru "j > 0"
                            totalTaxes += taxRate[j] * taxableIncome[j];

                        }
                    }
                } else if (userIncome <= 9725) {
                    totalTaxes += taxRate[0] * userIncome;

                    breakMainLoop = false;
                }
            }

        }
        return totalTaxes;
    }

}// end class