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// represents the comparison to be performed on two variables
// @author Chris Tsuei

public class Comparison extends TrueFalse{
	/*operation is the action(+, -, *, /, %) to be done
	 * fistVariable and SecondVariable are the variables the operation is to be applied to
	 * firstValue and secondValue are the values of the firstVariable and secondVariable respectively
	 */
	public Operator operation;
	public Expression firstVariable;
	public Expression secondVariable;
	public int firstValue;
	public int secondValue;

	//enum class of the ArithmeticOperation class
	private static enum Operator{
		//the user can either add, subtract, multiply, divide or moduolo
		LT, LTE, GT, GTE, EQ, NEQ;}

	public Comparison(Operator operator, Expression variable, Expression variable2) {
		this.operation = operator;
		this.firstVariable = variable;
		this.secondVariable = variable2;
	}

	/*gets the value of the operation
	 * @Override
	 * @param state the hashtable holding all of the variables
	 * @return	the result of the operation
	 */
	public boolean value(State state) {
		this.firstValue = firstVariable.value(state);
		this.secondValue = secondVariable.value(state);

		if(operation.equals("<")) {
			return firstValue < secondValue;
		}
		else if(operation.equals("<=")) {
			return firstValue <= secondValue;
		}
		else if(operation.equals(">")) {
			return firstValue > secondValue;
		}
		else if(operation.equals(">=")) {
			return firstValue >= secondValue;
		}
		else if(operation.equals("==")) {
			return firstValue == secondValue;
		}
		else {
			return firstValue != secondValue;
		}
	}

	/*	@Override overides the toString() method
	 * 	@return returns the string value of the operation
	 */
	public String toString() {
		String op;
		if(operation.equals("LT")) {
			op = "<";
		}
		else if(operation.equals("LTE")) {
			op = "<=";
		}
		else if(operation.equals("GT")) {
			op = ">";
		}
		else if(operation.equals("GTE")) {
			op = ">=";
		}
		else if(operation.equals("EQ")) {
			op = "==";
		}
		else {
			op = "!=";
		}
		return firstVariable.toString() + " " + op + " " + secondVariable.toString();
	}
}