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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.graphs.cfg;

import java.io.Serializable;
import java.util.Objects;

import org.evosuite.coverage.branch.Branch;
public class ControlDependency implements Serializable, Comparable {

	private static final long serialVersionUID = 6288839964561655730L;

	private final Branch branch;
	private final boolean branchExpressionValue;

	/**
	 * Constructor for ControlDependency.
	 *
	 * @param branch a {@link org.evosuite.coverage.branch.Branch} object.
	 * @param branchExpressionValue a boolean.
	 */
	public ControlDependency(Branch branch, boolean branchExpressionValue) {
		if (branch == null)
			throw new IllegalArgumentException(
			        "control dependencies for the root branch are not permitted (null)");

		this.branch = branch;
		this.branchExpressionValue = branchExpressionValue;
	}

	/**
	 * Getter for the field branch.
	 *
	 * @return a {@link org.evosuite.coverage.branch.Branch} object.
	 */
	public Branch getBranch() {
		return branch;
	}

	/**
	 * Getter for the field branchExpressionValue.
	 *
	 * @return a boolean.
	 */
	public boolean getBranchExpressionValue() {
		return branchExpressionValue;
	}
	
//	@Override
//	public int hashCode() {
//		final int prime = 31;
//		int result = 1;
//		result = prime * result + ((branch == null) ? 0 : branch.hashCode());
//		result = prime * result + (branchExpressionValue ? 1231 : 1237);
//		return result;
//	}
//
//	@Override
//	public boolean equals(Object obj) {
//		if (this == obj)
//			return true;
//		if (obj == null)
//			return false;
//		if (getClass() != obj.getClass())
//			return false;
//		ControlDependency other = (ControlDependency) obj;
//		if (branch == null) {
//			if (other.branch != null)
//				return false;
//		} else if (!branch.equals(other.branch))
//			return false;
//		if (branchExpressionValue != other.branchExpressionValue)
//			return false;
//		return true;
//	}

	/** {@inheritDoc} */
	@Override
	public String toString() {

		String r = "CD " + branch.toString();

		if (!branch.isSwitchCaseBranch()) {
			if (branchExpressionValue)
				r += " - TRUE";
			else
				r += " - FALSE";
		}

		return r;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) return true;
		if (o == null || getClass() != o.getClass()) return false;
		ControlDependency that = (ControlDependency) o;
		return branchExpressionValue == that.branchExpressionValue &&
				Objects.equals(branch, that.branch);
	}

	@Override
	public int hashCode() {

		return Objects.hash(branch, branchExpressionValue);
	}

	@Override
	public int compareTo(ControlDependency o) {
		int x = branch.compareTo(o.branch);
		if(x != 0)
			return x;

		if(branchExpressionValue == o.branchExpressionValue) {
			return 0;
		} else if(branchExpressionValue) {
			return 1;
		} else {
			return -1;
		}
	}
}