import java.text.NumberFormat;
import uwcse.io.*;

/**
 * Practicing using conditionals
 */

public class Conditionals {
	/**
	 * A method to illustrate the use of de Morgan's laws
	 */
	public void testDeMorganLaws() {
		// ask for the family income
		// ask for the number of children
		// if the family income is not greater than 20000
		// or if the number of children is greater than 3
		// display a message stating that the family might
		// be eligible for a stipend
		// do this in 2 ways

		// Input
		Input input = new Input();
		double income = input.readDouble("What is your income? ");
		int children = input.readInt("How many children do you have? ");

		// Test for the stipend eligibility in 2 ways
		// Both ways should give the same result
		// 1) write the condition with an || (or)
		if (!(income > 20000) || children > 3)
			System.out.println("You might be eligible for a stipend");
		else
			System.out.println("You are not eligible for a stipend");

		// 2) write the condition with an && (and)
		if (!(income > 20000 && children <= 3))
			System.out.println("You might be eligible for a stipend");
		else
			System.out.println("You are not eligible for a stipend");
	}

	public void printGrade() {
		// given a grade between 0 and 100
		// print the corresponding letter grade
		// 90-100 is A, 80-89 is B, 70-79 is C, 60-69 is D, below 60 is F
		//
		// use an if-else if structure
		//
		// do the same with a switch statement

		int grade;
		Input input = new Input();
		grade = input.readInt("Enter the grade: ");

		// The grade must be between 0 and 100
		if (grade < 0 || grade > 100) {
			System.out.println("Invalid input");
			return;
		}

		// Print the letter grade using nested ifs
		if (grade >= 90)
			System.out.println("A");
		else if (grade >= 80)
			System.out.println("B");
		else if (grade >= 70)
			System.out.println("C");
		else if (grade >= 60)
			System.out.println("D");
		else
			System.out.println("F");

		// Print the letter grade using a switch
		switch (grade / 10) {
		case 10:
		case 9:
			System.out.println("A");
			break;
		case 8:
			System.out.println("B");
			break;
		case 7:
			System.out.println("C");
			break;
		case 6:
			System.out.println("D");
			break;
		default:
			System.out.println("F");
			break;
		}
	}

	/**
	 * more ifs
	 */
	public void reportToIRS() {
		// IRS informants are paid cash awards based on the
		// value of the money recovered. If the information
		// was specific enough to lead to a recovery, the
		// informant receives 10 percent of the first $75,000,
		// 5 percent of the next $25,000 and 1 percent of the
		// remainder, up to a maximum award of $50,000.
		// Write a function that takes as input the amount of
		// the recovery and returns the award.
		// Test your program by having main call the function
		// for different amounts.

		// money recovered
		double moneyBack;
		Input input = new Input();
		moneyBack = input.readDouble("How much money has been recovered? ");

		// print the reward
		double reward = computeReward(moneyBack);
		NumberFormat nf = NumberFormat.getCurrencyInstance();
		System.out.println("Reward=" + nf.format(reward));
	}

	private double computeReward(double m) {
		double r = 0;
		if (m <= 75000) // below 75000: 10%
			r += 0.1 * m;
		else {
			r += 7500; // 10% of the first 75000
			m -= 75000;
			if (m <= 25000) // below 100000: 5% of what is above 75000
				r += 0.05 * m;
			else {
				r += 0.05 * 25000; // 5% of the next 25000
				m -= 25000;
				r += 0.01 * m; // 1% of what is left
				if (r > 50000)
					r = 50000; // can't get more than 50000
			}
		}
		return r;
	}

	/**
	 * Starts the application
	 */
	public static void main(String[] args) {
		Conditionals c = new Conditionals();
		// test de Morgan's laws
		c.testDeMorganLaws();
		// if else if and switch
		c.printGrade();
		// irs reward computation
		c.reportToIRS();
	}
}