package cu.cs.cpsc2150.project1;

public class VariableExpression extends SymbolTable {

	String var, operator;

	int num;

	public String getVar() {
		return var;
	}

	public void setVar(String var) {
		this.var = var;
	}

	public int getNum() {
		return num;
	}

	public void setNum(int num) {
		this.num = num;
	}

	public String getOperator() {
		return operator;
	}

	public void setOperator(String operator) {
		this.operator = operator;
	}



	public void readVariable(String input){
		if (input.indexOf(":=") > -1){
			// Assign a value to key in Symbol table

			String[] elems = input.split("\\s+");

			setVar(elems[0]);
			setNum(Integer.parseInt(elems[2]));

			SymbolTable.insert(getVar(), getNum());

		}else if(input.length() == 1){
			// check if key has a value
			// if so return
			//else error

			Integer value = SymbolTable.getValue(input);

			if(value != null){
				System.out.println(input + " = " + value);
			}else{
				System.out.println("Variable " + input + "has no value assignment");
			}
		}else{


			String[] elems = input.split("\\s+");

			Integer valueOfVar1 = SymbolTable.getValue(elems[0]);
			Integer valueOfVar2 = SymbolTable.getValue(elems[2]);



			setOperator(elems[1]);

			if(elems[0].matches(".*[a-zA-Z]+.*")){
				if(valueOfVar1 != null){
					valueOfVar1 = SymbolTable.getValue(elems[0]);
				}else{
					System.out.println("Variable " + input + "has no value assignment");
				}
			}else{
				valueOfVar1 = Integer.parseInt(elems[0]);
			}

			if(elems[2].matches(".*[a-zA-Z]+.*")){
				if(valueOfVar2 != null){
					valueOfVar2 = SymbolTable.getValue(elems[2]);
				}else{
					System.out.println("Variable " + input + "has no value assignment");
				}
			}else{
				valueOfVar2 = Integer.parseInt(elems[2]);
			}

			double ans = BinaryExpression.calculate(valueOfVar1.intValue(),valueOfVar2.intValue(), getOperator());


			System.out.println(input + " = " + ans);

		}
	}

}