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/*P2Q10
 * Name:Wang Chaoran
 * Description:10 (Computing taxes)
Listing 3.4 gives the source code to compute taxes for single filers.
Complete Listing 3.4 to give the complete source code. 
*/

import javax.swing.JOptionPane;

  public class P2Q10 {
    public static void main(String[] args) {
      // Prompt the user to enter filing status
      String statusString = JOptionPane.showInputDialog(
        "Enter the filing status:\n" +
        "(0-single filer, 1-married jointly,\n" +
        "2-married separately, 3-head of household)");
      int status = Integer.parseInt(statusString);

      // Prompt the user to enter taxable income
      String incomeString = JOptionPane.showInputDialog(
        "Enter the taxable income:");
      double income = Double.parseDouble(incomeString);

      // Compute tax
      double tax = 0;

      if (status == 0) { // Compute tax for single filers
        if (income <= 6000)
          tax = income * 0.10;
        else if (income <= 27950)
          tax = 6000 * 0.10 + (income - 6000) * 0.15;
        else if (income <= 67700)
          tax = 6000 * 0.10 + (27950 - 6000) * 0.15 +
            (income - 27950) * 0.27;
        else if (income <= 141250)
          tax = 6000 * 0.10 + (27950 - 6000) * 0.15 +
            (67700 - 27950) * 0.27 + (income - 67700) * 0.30;
        else if (income <= 307050)
          tax = 6000 * 0.10 + (27950 - 6000) * 0.15 +
            (67700 - 27950) * 0.27 + (141250 - 67700) * 0.30 +
            (income - 141250) * 0.35;
        else
          tax = 6000 * 0.10 + (27950 - 6000) * 0.15 +
            (67700 - 27950) * 0.27 + (141250 - 67700) * 0.30 +
            (307050 - 141250) * 0.35 + (income - 307050) * 0.386;
      }
      else if (status == 1) { // Compute tax for married file jointly
        if (income <= 12000)
          tax = income * 0.10;
        else if (income <= 46700)
          tax = 12000 * 0.10 + (income - 12000) * 0.15;
        else if (income <= 112850)
          tax = 12000 * 0.10 + (46700 - 12000) * 0.15 +
            (income - 46700) * 0.27;
        else if (income <= 171950)
          tax = 12000 * 0.10 + (46700 - 12000) * 0.15 +
            (112850 - 46700) * 0.27 + (income - 112850) * 0.30;
        else if (income <= 307050)
          tax = 12000 * 0.10 + (46700 - 12000) * 0.15 +
            (112850 - 46700) * 0.27 + (171950 - 112850) * 0.30 +
            (income - 171950) * 0.35;
        else
          tax = 12000 * 0.10 + (46700 - 12000) * 0.15 +
            (112850 - 46700) * 0.27 + (171950 - 112850) * 0.30 +
            (307050 - 171950) * 0.35 + (income - 307050) * 0.386;
      }
      else if (status == 2) { // Compute tax for married separately
        if (income <= 6000)
          tax = income * 0.10;
        else if (income <= 23350)
          tax = 6000 * 0.10 + (income - 6000) * 0.15;
        else if (income <= 56425)
          tax = 6000 * 0.10 + (23350 - 6000) * 0.15 +
            (income - 23350) * 0.27;
        else if (income <= 85975)
          tax = 6000 * 0.10 + (23350 - 6000) * 0.15 +
            (56425 - 23350) * 0.27 + (income - 56425) * 0.30;
        else if (income <= 153525 )
          tax = 6000 * 0.10 + (23350 - 6000) * 0.15 +
            (56425 - 23350) * 0.27 + (85975 - 56425) * 0.30 +
            (income - 85975) * 0.35;
        else
          tax = 6000 * 0.10 + (23350 - 6000) * 0.15 +
            (56425 - 23350) * 0.27 + (85975 - 56425) * 0.30 +
            (153525 - 85975) * 0.35 + (income - 153525) * 0.386;
      }
      else if (status == 3) { // Compute tax for head of household
        if (income <= 10000)
          tax = income * 0.10;
        else if (income <= 37450)
          tax = 10000 * 0.10 + (income - 10000) * 0.15;
        else if (income <= 96700)
          tax = 10000 * 0.10 + (37450 - 10000) * 0.15 +
            (income - 37450) * 0.27;
        else if (income <= 156600)
          tax = 10000 * 0.10 + (37450 - 10000) * 0.15 +
            (96700 - 37450) * 0.27 + (income - 96700) * 0.30;
        else if (income <= 307050 )
          tax = 10000 * 0.10 + (37450 - 10000) * 0.15 +
            (96700 - 37450) * 0.27 + (156600 - 96700) * 0.30 +
            (income - 156600) * 0.35;
        else
          tax = 10000 * 0.10 + (37450 - 10000) * 0.15 +
            (96700 - 37450) * 0.27 + (156600 - 96700) * 0.30 +
            (307050 - 156600) * 0.35 + (income - 307050) * 0.386;
      }
      else {
        System.out.println("Error: invalid status");
        System.exit(0);
      }

      // Display the result
      JOptionPane.showMessageDialog(null, "Tax is " +
        (int)(tax * 100) / 100.0);
    }
  }