// header file
#include "Arizona_Tax_Utility.h"

// Defined Functions:
/*
Name: calculateArizonaTax
Process: calculates total marginal Arizona tax based on adjusted income
Function Input/Parameters: adjustedIncome
Function Output/Parameters: none
Function Output/Returned: totalAZTax
Device Input/Keyboard: none
Device Output/Monitor: none
Dependencies: none
*/
double calculateArizonaTax(double adjustedIncome)
{
    // define variables
        // need a variable that holds the amount of money after the last bracket takes from it.
    double incomeLeft, totalAZTax;
    double maxBaselineTax, maxFirstTax, maxSecondTax;
    incomeLeft = 0;
    totalAZTax = 0;
    maxBaselineTax = AZ_TAX_BASELINE_LIMIT * AZ_TAX_BASELINE_RATE;
    maxFirstTax = maxBaselineTax +
                            (AZ_TAX_FIRST_BRACKET_LIMIT - AZ_TAX_BASELINE_LIMIT)
                                                    * AZ_TAX_FIRST_BRACKET_RATE;
    maxSecondTax = maxFirstTax +
                      (AZ_TAX_SECOND_BRACKET_LIMIT - AZ_TAX_FIRST_BRACKET_LIMIT)
                                                   * AZ_TAX_SECOND_BRACKET_RATE;

    // get input
        // input is passed in from the function parameter

    // do calculations
        // use if statements to calculate through the progressive tax brackets
    if (adjustedIncome < AZ_TAX_BASELINE_LIMIT)
    {
        // check for baseline bracket
        // calculate tax for baseline
        totalAZTax = adjustedIncome * AZ_TAX_BASELINE_RATE;
    }
    else if(adjustedIncome < AZ_TAX_FIRST_BRACKET_LIMIT)
    {
        // check for first bracket and baseline bracket
        // calculate tax for first and baseline bracket
        incomeLeft = adjustedIncome - AZ_TAX_BASELINE_LIMIT;
        totalAZTax = maxBaselineTax + (incomeLeft * AZ_TAX_FIRST_BRACKET_RATE);
    }
    else if(adjustedIncome < AZ_TAX_SECOND_BRACKET_LIMIT)
    {
        // check for second, first, and baseline bracket
        // calculate tax for second, first, and baseline bracket
        incomeLeft = adjustedIncome - AZ_TAX_FIRST_BRACKET_LIMIT;
        totalAZTax = maxFirstTax + (incomeLeft * AZ_TAX_SECOND_BRACKET_RATE);
    }
    else
    {
        // otherwise, apply the max, second, first, and baseline bracket
        // calculate tax for max, second, first, and baseline bracket
        incomeLeft = adjustedIncome - AZ_TAX_SECOND_BRACKET_LIMIT;
        totalAZTax = maxSecondTax + (incomeLeft * AZ_TAX_MAX_RATE);
    }

    // display results
        // not needed, returns instead.

    // return value
        // returns the final calculated tax
    return totalAZTax;
}