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/**
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see .
 */
package org.evosuite.symbolic.vm;

import java.util.Deque;
import java.util.Iterator;
import java.util.LinkedList;

import org.evosuite.symbolic.expr.bv.IntegerValue;
import org.evosuite.symbolic.expr.fp.RealValue;
import org.evosuite.symbolic.expr.ref.ReferenceExpression;

/**
 * 
 * @author galeotti
 * 
 */
public final class OperandStack implements Iterable {

	private final Deque stack = new LinkedList();

	public OperandStack() {
	}

	public void pushRef(ReferenceExpression r) {
		stack.push(new ReferenceOperand(r));
	}

	public void pushBv32(IntegerValue e) {
		stack.push(new Bv32Operand(e));
	}

	public void pushBv64(IntegerValue e) {
		stack.push(new Bv64Operand(e));
	}

	public void pushFp32(RealValue e) {
		stack.push(new Fp32Operand(e));
	}

	public void pushFp64(RealValue e) {
		stack.push(new Fp64Operand(e));
	}

	public ReferenceExpression popRef() {
		Operand ret_val = this.popOperand();
		ReferenceOperand ref = (ReferenceOperand) ret_val;
		return ref.getReference();
	}

	public IntegerValue popBv32() {
		Operand x = this.popOperand();
		Bv32Operand e = (Bv32Operand) x;
		return e.getIntegerExpression();
	}

	public IntegerValue popBv64() {
		Operand x = this.popOperand();
		Bv64Operand e = (Bv64Operand) x;
		return e.getIntegerExpression();
	}

	public RealValue popFp32() {
		Operand x = this.popOperand();
		Fp32Operand e = (Fp32Operand) x;
		return e.getRealExpression();
	}

	public RealValue popFp64() {
		Operand x = this.popOperand();
		Fp64Operand e = (Fp64Operand) x;
		return e.getRealExpression();
	}

	public Operand popOperand() {
		Operand ret_val = this.stack.pop();
		return ret_val;
	}

	public void clearOperands() {
		stack.clear();
	}

	public void pushOperand(Operand operand) {
		if (operand == null) {
			throw new IllegalArgumentException("Cannot push a null operand into OperandStack");
		}
		stack.push(operand);
	}

	public RealValue peekFp64() {
		Operand operand = stack.peek();
		Fp64Operand fp64 = (Fp64Operand) operand;
		return fp64.getRealExpression();
	}

	public RealValue peekFp32() {
		Operand operand = stack.peek();
		Fp32Operand fp32 = (Fp32Operand) operand;
		return fp32.getRealExpression();
	}

	public IntegerValue peekBv64() {
		Operand operand = stack.peek();
		Bv64Operand bv64 = (Bv64Operand) operand;
		return bv64.getIntegerExpression();
	}

	public IntegerValue peekBv32() {
		Operand operand = stack.peek();
		Bv32Operand bv32 = (Bv32Operand) operand;
		return bv32.getIntegerExpression();
	}

	public Operand peekOperand() {
		return stack.peek();
	}

	public Iterator iterator() {
		return stack.iterator();
	}

	public ReferenceExpression peekRef() {
		Operand operand = this.peekOperand();
		if (!(operand instanceof ReferenceOperand)) {
			throw new ClassCastException(
					"top of stack is not a reference but an operand of type " + operand.getClass().getCanonicalName());
		}
		ReferenceOperand refOp = (ReferenceOperand) operand;
		ReferenceExpression ref = refOp.getReference();
		return ref;
	}

	@Override
	public String toString() {
		if (this.stack.isEmpty()) {
			return "<>";
		}

		StringBuffer buff = new StringBuffer();
		for (Operand operand : this) {
			buff.append(operand.toString() + "\n");
		}
		return buff.toString();
	}

	public int size() {
		return stack.size();
	}

	public boolean isEmpty() {
		return stack.isEmpty();
	}

	public void pushNullRef() {
		ReferenceExpression nullExpression = ExpressionFactory.buildNewNullExpression();
		this.stack.push(new ReferenceOperand(nullExpression));
	}
}