/**
 * Copyright (C) 2010-2017 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 <http://www.gnu.org/licenses/>.
 */
/**
 * 
 */
package org.evosuite.symbolic.expr.bv;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;

import org.evosuite.Properties;
import org.evosuite.symbolic.ConstraintTooLongException;
import org.evosuite.symbolic.DSEStats;
import org.evosuite.symbolic.expr.AbstractExpression;
import org.evosuite.symbolic.expr.Expression;
import org.evosuite.symbolic.expr.ExpressionVisitor;
import org.evosuite.symbolic.expr.MultipleExpression;
import org.evosuite.symbolic.expr.Operator;
import org.evosuite.symbolic.expr.Variable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * <p>
 * StringMultipleComparison class.
 * </p>
 * 
 * @author krusev
 */
public final class StringMultipleComparison extends AbstractExpression<Long> implements
        StringComparison, MultipleExpression<String> {

	private static final long serialVersionUID = -3844726361666119758L;

	protected static final Logger log = LoggerFactory.getLogger(StringMultipleComparison.class);

	private final Operator op;

	private final Expression<String> left;

	private final Expression<?> right;

	private final ArrayList<Expression<?>> other_v;

	/**
	 * <p>
	 * Constructor for StringMultipleComparison.
	 * </p>
	 * 
	 * @param _left
	 *            a {@link org.evosuite.symbolic.expr.Expression} object.
	 * @param _op
	 *            a {@link org.evosuite.symbolic.expr.Operator} object.
	 * @param _right
	 *            a {@link org.evosuite.symbolic.expr.Expression} object.
	 * @param _other
	 *            a {@link java.util.ArrayList} object.
	 * @param con
	 *            a {@link java.lang.Long} object.
	 */
	public StringMultipleComparison(Expression<String> _left, Operator _op,
	        Expression<?> _right, ArrayList<Expression<?>> _other, Long con) {
		super(con, 1 + _left.getSize() + _right.getSize() + countSizes(_other),
		        _left.containsSymbolicVariable() || _right.containsSymbolicVariable()
		                || containsSymbolicVariable(_other));
		this.op = _op;
		this.left = _left;
		this.right = _right;
		this.other_v = _other;

		if (getSize() > Properties.DSE_CONSTRAINT_LENGTH) {
			DSEStats.getInstance().reportConstraintTooLong(getSize());
			throw new ConstraintTooLongException(getSize());
		}
	}

	private static int countSizes(ArrayList<Expression<?>> list) {
		int retVal = 0;
		for (Expression<?> e : list) {
			retVal += e.getSize();
		}
		return retVal;
	}

	private static boolean containsSymbolicVariable(ArrayList<Expression<?>> list) {

		for (Expression<?> e : list) {
			if (e.containsSymbolicVariable()) {
				return true;
			}
		}

		return false;
	}

	/**
	 * <p>
	 * getOther
	 * </p>
	 * 
	 * @return the other
	 */
	@Override
	public ArrayList<Expression<?>> getOther() {
		return other_v;
	}

	/** {@inheritDoc} */
	@Override
	public Operator getOperator() {
		return op;
	}

	/** {@inheritDoc} */
	@Override
	public Expression<String> getLeftOperand() {
		return left;
	}

	/** {@inheritDoc} */
	@Override
	public Expression<?> getRightOperand() {
		return right;
	}

	/** {@inheritDoc} */
	@Override
	public String toString() {
		String str_other_v = "";
		for (int i = 0; i < this.other_v.size(); i++) {
			str_other_v += " " + this.other_v.get(i).toString();
		}

		return "(" + left + op.toString() + (right == null ? "" : right) + str_other_v
		        + ")";
	}

	/** {@inheritDoc} */
	@Override
	public boolean equals(Object obj) {
		if (obj == this) {
			return true;
		}
		if (obj instanceof StringMultipleComparison) {
			StringMultipleComparison other = (StringMultipleComparison) obj;
			return this.op.equals(other.op) && this.left.equals(other.left)
			        && this.right.equals(other.right)
			        && this.other_v.equals(other.other_v);
		}

		return false;
	}

	@Override
	public int hashCode() {
		return this.op.hashCode() + this.left.hashCode() + this.right.hashCode()
		        + this.other_v.hashCode();
	}

	@Override
	public Set<Variable<?>> getVariables() {
		Set<Variable<?>> variables = new HashSet<Variable<?>>();
		variables.addAll(this.left.getVariables());
		variables.addAll(this.right.getVariables());
		for (Expression<?> other_e : this.other_v) {
			variables.addAll(other_e.getVariables());
		}
		return variables;
	}

	@Override
	public Set<Object> getConstants() {
		Set<Object> result = new HashSet<Object>();
		result.addAll(this.left.getConstants());
		result.addAll(this.right.getConstants());
		for (Expression<?> other_e : this.other_v) {
			result.addAll(other_e.getConstants());
		}
		return result;
	}

	@Override
	public <K, V> K accept(ExpressionVisitor<K, V> v, V arg) {
		return v.visit(this, arg);
	}
}