/*
 * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.controller.sal.action;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.xml.bind.annotation.*;
import java.io.Serializable;

/**
 * Represents the generic action to be applied to the matched
 * frame/packet/message
 */
@XmlRootElement
@XmlAccessorType(XmlAccessType.NONE)
public abstract class Action implements Serializable {
    private static final long serialVersionUID = 1L;
    private static final Logger logger = LoggerFactory.getLogger(Action.class);
    private static boolean debug = false; // Enable to find where in the code an
    // invalid assignment is made
    @XmlElement
    protected ActionType type;
    private transient boolean isValid = true;

    /* Dummy constructor for JAXB */
    public Action() {
    }

    /**
     * Checks if the passed value is in the valid range for this action
     *
     * @param value
     * @return boolean
     */
    protected void checkValue(int value) {
        if (type.isValidTarget(value) == false) {
            isValid = false;
            throwValueException(value);
        }
    }

    /**
     * Checks if the passed value is in the valid range for the passed action
     * type This method is used for complex Action types which are
     *
     * @param value
     * @return boolean
     */
    protected void checkValue(ActionType type, int value) {
        if (type.isValidTarget(value) == false) {
            isValid = false;
            throwValueException(value);
        }
    }

    /**
     * Throw and handle the invalid value exception
     *
     * @param value
     * @return void
     */
    private void throwValueException(int value) {
        String error = "Invalid field value assignement. For type: " + type.getId() + " Expected: " + type.getRange()
                + ", Got: 0x" + Integer.toHexString(value);
        try {
            throw new Exception(error);
        } catch (Exception e) {
            logger.error(e.getMessage());
            if (debug) {
                logger.error("", e);
            }
        }
    }

    /**
     * Returns the type of this action
     *
     * @return ActionType
     */
    public ActionType getType() {
        return type;
    }

    /**
     * Returns the id of this action
     *
     * @return String
     */
    public String getId() {
        return type.getId();
    }

    /**
     * Returns whether the Action is valid or not
     *
     * @return boolean
     */
    public boolean isValid() {
        return isValid;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((type == null) ? 0 : type.calculateConsistentHashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        Action other = (Action) obj;
        if (type != other.type) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return type.toString();
    }

}