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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.string;

import org.evosuite.symbolic.expr.Operator;
import org.evosuite.symbolic.expr.bv.StringBinaryComparison;
import org.evosuite.symbolic.expr.ref.ReferenceConstant;
import org.evosuite.symbolic.expr.ref.ReferenceExpression;
import org.evosuite.symbolic.expr.str.StringValue;
import org.evosuite.symbolic.vm.SymbolicEnvironment;
import org.evosuite.symbolic.vm.SymbolicFunction;
import org.evosuite.symbolic.vm.SymbolicHeap;

public final class Equals extends SymbolicFunction {

	private static final String EQUALS = "equals";

	public Equals(SymbolicEnvironment env) {
		super(env, Types.JAVA_LANG_STRING, EQUALS,
				Types.OBJECT_TO_BOOL_DESCRIPTOR);
	}

	@Override
	public Object executeFunction() {

		String conc_left = (String) this.getConcReceiver();
		ReferenceConstant symb_left = this.getSymbReceiver();

		Object conc_right = this.getConcArgument(0);
		ReferenceExpression symb_right = this.getSymbArgument(0);

		boolean res = this.getConcBooleanRetVal();

		StringValue left_expr = env.heap.getField(Types.JAVA_LANG_STRING,
				SymbolicHeap.$STRING_VALUE, conc_left, symb_left, conc_left);

		if (symb_right instanceof ReferenceConstant
				&& conc_right instanceof String) {
			ReferenceConstant non_null_symb_right = (ReferenceConstant) symb_right;
			String conc_right_str = (String) conc_right;

			StringValue right_expr = env.heap.getField(Types.JAVA_LANG_STRING,
					SymbolicHeap.$STRING_VALUE, conc_right_str,
					non_null_symb_right, conc_right_str);

			if (left_expr.containsSymbolicVariable()
					|| right_expr.containsSymbolicVariable()) {
				int conV = res ? 1 : 0;
				StringBinaryComparison strBExpr = new StringBinaryComparison(left_expr,
						Operator.EQUALS, right_expr, (long) conV);
				return strBExpr;
			}

		}

		return this.getSymbIntegerRetVal();
	}
}