/**
 * Assignment 1, COMP268 Class: BonusOnSavings.java
 *
 * @description Represents an object that can compute a bonus based on the amount an employee saves.
 * @author: mo khan Student ID: 3431709
 * @date May 7, 2019
 * @version 1.0
 */
package Q2;

public class BonusOnSavings {
  double annualRate = 0.0;
  double quarterlyRate = 0.0;

  /** Constructs a BonusOnSavings with a default quarterly rate of 3% and annual rate of 5%. */
  public BonusOnSavings() {
    this(0.03, 0.05);
  }

  /**
   * Constructs a BonusOnSavings object for a given income and marital status, and computes the tax.
   *
   * @param quarterlyRate the quarterly rate to apply.
   * @param annualRate the annual rate to apply.
   */
  public BonusOnSavings(double quarterlyRate, double annualRate) {
    this.quarterlyRate = quarterlyRate;
    this.annualRate = annualRate;
  }

  /**
   * Computes the bonus based on the target monthly commitment and the actual quarterly
   * contributions.
   *
   * @param monthlyCommitment the target monthly commitment for each month.
   * @param q1 the actual contribution for the first quarter.
   * @param q2 the actual contribution for the second quarter.
   * @param q3 the actual contribution for the third quarter.
   * @param q4 the actual contribution for the fourth quarter.
   * @return the calculated bonus amount for the year.
   */
  public double computeBonus(double monthlyCommitment, double q1, double q2, double q3, double q4) {
    double quarterlyTarget = monthlyCommitment * 3;
    double annualTarget = monthlyCommitment * 12;

    return this.quarterlyBonus(quarterlyTarget, q1)
        + this.quarterlyBonus(quarterlyTarget, q2)
        + this.quarterlyBonus(quarterlyTarget, q3)
        + this.quarterlyBonus(quarterlyTarget, q4)
        + this.annualBonus(annualTarget, q1 + q2 + q3 + q4);
  }

  /**
   * Computes the quarterly bonus for a given target and actual contribution amount.
   *
   * @param target the target quarterly contribution amount for this employee.
   * @param actual the actual quarterly contribution amount for this employee.
   * @return the calculated quarterly bonus
   */
  private double quarterlyBonus(double target, double actual) {
    return (actual >= target) ? actual * this.quarterlyRate : 0.0;
  }

  /**
   * Calculates the annual bonus amount for the target annual contribution and the actual
   * contribution.
   *
   * @param target the target annual contribution
   * @param actual the actual contribution amount for the year
   * @return the calculated annual bonus
   */
  private double annualBonus(double target, double actual) {
    if (actual < target) return 0.0;

    return (actual * this.annualRate) + ((actual - target) * 0.25);
  }
}