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/*
 * Copyright 2014-present Open Networking Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.onosproject.net.flow;

import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.slf4j.LoggerFactory.getLogger;

import org.slf4j.Logger;

import java.util.concurrent.TimeUnit;

public class DefaultFlowEntry extends DefaultFlowRule
    implements StoredFlowEntry {

    private static final Logger log = getLogger(DefaultFlowEntry.class);

    private static final long DEFAULT_LAST_SEEN = -1;
    private static final int DEFAULT_ERR_CODE = -1;
    private static final int DEFAULT_ERR_TYPE = -1;

    /* Stored in nanoseconds (allows for 292 years) */
    private long life;

    private long packets;
    private long bytes;
    private FlowEntryState state;
    private FlowLiveType liveType;

    private long lastSeen = DEFAULT_LAST_SEEN;

    private final int errType;

    private final int errCode;

    /**
     * Creates a flow entry of flow table specified with the flow rule, state
     * and statistic information.
     *
     * @param rule the flow rule
     * @param state the flow state
     * @param life the duration second of flow
     * @param lifeTimeUnit life time unit
     * @param packets the number of packets of this flow
     * @param bytes the the number of bytes of this flow
     */
    public DefaultFlowEntry(FlowRule rule, FlowEntryState state,
                            long life, TimeUnit lifeTimeUnit, long packets, long bytes) {
        super(rule);
        this.state = state;
        this.life = lifeTimeUnit.toNanos(life);
        this.liveType = FlowLiveType.UNKNOWN;
        this.packets = packets;
        this.bytes = bytes;
        this.errCode = DEFAULT_ERR_CODE;
        this.errType = DEFAULT_ERR_TYPE;
        this.lastSeen = System.currentTimeMillis();
    }

    /**
     * Creates a flow entry of flow table specified with the flow rule, state
     * and statistic information.
     *
     * @param rule the flow rule
     * @param state the flow state
     * @param life the duration second of flow
     * @param lifeTimeUnit life time unit
     * @param liveType the flow live type, i.e., IMMEDIATE, SHORT, MID, LONG
     * @param packets the number of packets of this flow
     * @param bytes the the number of bytes of this flow
     */
    public DefaultFlowEntry(FlowRule rule, FlowEntryState state,
                            long life, TimeUnit lifeTimeUnit, FlowLiveType liveType,
                            long packets, long bytes) {
        this(rule, state, life, lifeTimeUnit, packets, bytes);
        this.liveType = liveType;
    }

    /**
     * Creates a flow entry of flow table specified with the flow rule, state,
     * live type and statistic information.
     *
     * @param rule the flow rule
     * @param state the flow state
     * @param lifeSecs the duration second of flow
     * @param liveType the flow live type, i.e., IMMEDIATE, SHORT, MID, LONG
     * @param packets the number of packets of this flow
     * @param bytes the the number of bytes of this flow
     */
    public DefaultFlowEntry(FlowRule rule, FlowEntryState state,
                            long lifeSecs, FlowLiveType liveType,
                            long packets, long bytes) {
        this(rule, state, lifeSecs, SECONDS, packets, bytes);
        this.liveType = liveType;
    }

    public DefaultFlowEntry(FlowRule rule, FlowEntryState state,
                            long lifeSecs, long packets, long bytes) {
        this(rule, state, lifeSecs, SECONDS, packets, bytes);
    }

    public DefaultFlowEntry(FlowRule rule) {
        this(rule, FlowEntryState.PENDING_ADD, 0, 0, 0);
    }

    /**
     * Creates a flow entry based on specified flow rule and state.
     *
     * @param rule to use as base
     * @param state of the flow entry
     */
    public DefaultFlowEntry(FlowRule rule, FlowEntryState state) {
        this(rule, state, 0, 0, 0);
    }


    /**
     * Creates a flow entry of flow table specified with the flow rule, state,
     * live type and statistic information.
     *
     * @param rule the flow rule
     * @param errType the error type
     * @param errCode the error code
     */
    public DefaultFlowEntry(FlowRule rule, int errType, int errCode) {
        super(rule);
        this.state = FlowEntryState.FAILED;
        this.errType = errType;
        this.errCode = errCode;
        this.lastSeen = System.currentTimeMillis();
    }

    @Override
    public long life() {
        return life(SECONDS);
    }

    @Override
    public long life(TimeUnit timeUnit) {
        return timeUnit.convert(life, NANOSECONDS);
    }

    @Override
    public FlowLiveType liveType() {
        return liveType;
    }

    @Override
    public long packets() {
        return packets;
    }

    @Override
    public long bytes() {
        return bytes;
    }

    @Override
    public FlowEntryState state() {
        return this.state;
    }

    @Override
    public long lastSeen() {
        return lastSeen;
    }

    @Override
    public void setLastSeen() {
        this.lastSeen = System.currentTimeMillis();
    }

    @Override
    public void setState(FlowEntryState newState) {
        this.state = newState;
    }

    @Override
    public void setLife(long life) {
        setLife(life, SECONDS);
    }

    @Override
    public void setLife(long life, TimeUnit timeUnit) {
        this.life = timeUnit.toNanos(life);
    }

    @Override
    public void setLiveType(FlowLiveType liveType) {
        this.liveType = liveType;
    }

    @Override
    public void setPackets(long packets) {
        this.packets = packets;
    }

    @Override
    public void setBytes(long bytes) {
        this.bytes = bytes;
    }

    @Override
    public int errType() {
        return this.errType;
    }

    @Override
    public int errCode() {
        return this.errCode;
    }

    @Override
    public String toString() {
        return toStringHelper(this)
                .add("rule", super.toString())
                .add("state", state)
                .add("life", life)
                .add("liveType", liveType)
                .add("packets", packets)
                .add("bytes", bytes)
                .add("errCode", errCode)
                .add("errType", errType)
                .add("lastSeen", lastSeen)
                .toString();
    }
}