package org.onlab.onos.net.flow.criteria;

import static com.google.common.base.MoreObjects.toStringHelper;

import java.util.Objects;

import org.onlab.onos.net.PortNumber;
import org.onlab.onos.net.flow.criteria.Criterion.Type;
import org.onlab.packet.IpPrefix;
import org.onlab.packet.MacAddress;
import org.onlab.packet.VlanId;

/**
 * Factory class to create various traffic selection criteria.
 */
public final class Criteria {

    //TODO: incomplete type implementation. Need to implement complete list from Criterion

    // Ban construction
    private Criteria() {
    }

    /**
     * Creates a match on IN_PORT field using the specified value.
     *
     * @param port inport value
     * @return match criterion
     */
    public static Criterion matchInPort(PortNumber port) {
        return new PortCriterion(port);
    }

    /**
     * Creates a match on ETH_SRC field using the specified value. This value
     * may be a wildcard mask.
     *
     * @param mac MAC address value or wildcard mask
     * @return match criterion
     */
    public static Criterion matchEthSrc(MacAddress mac) {
        return new EthCriterion(mac, Type.ETH_SRC);
    }

    /**
     * Creates a match on ETH_DST field using the specified value. This value
     * may be a wildcard mask.
     *
     * @param mac MAC address value or wildcard mask
     * @return match criterion
     */
    public static Criterion matchEthDst(MacAddress mac) {
        return new EthCriterion(mac, Type.ETH_DST);
    }

    /**
     * Creates a match on ETH_TYPE field using the specified value.
     *
     * @param ethType eth type value
     * @return match criterion
     */
    public static Criterion matchEthType(Short ethType) {
        return new EthTypeCriterion(ethType);
    }

    /**
     * Creates a match on VLAN ID field using the specified value.
     *
     * @param vlanId vlan id value
     * @return match criterion
     */
    public static Criterion matchVlanId(VlanId vlanId) {
        return new VlanIdCriterion(vlanId);
    }

    /**
     * Creates a match on VLAN PCP field using the specified value.
     *
     * @param vlanPcp vlan pcp value
     * @return match criterion
     */
    public static Criterion matchVlanPcp(Byte vlanPcp) {
        return new VlanPcpCriterion(vlanPcp);
    }

    /**
     * Creates a match on IP proto field using the specified value.
     *
     * @param proto ip protocol value
     * @return match criterion
     */
    public static Criterion matchIPProtocol(Byte proto) {
        return new IPProtocolCriterion(proto);
    }

    /**
     * Creates a match on IP src field using the specified value.
     *
     * @param ip ip src value
     * @return match criterion
     */
    public static Criterion matchIPSrc(IpPrefix ip) {
        return new IPCriterion(ip, Type.IPV4_SRC);
    }

    /**
     * Creates a match on IP dst field using the specified value.
     *
     * @param ip ip src value
     * @return match criterion
     */
    public static Criterion matchIPDst(IpPrefix ip) {
        return new IPCriterion(ip, Type.IPV4_DST);
    }


    /*
     * Implementations of criteria.
     */

    public static final class PortCriterion implements Criterion {
        private final PortNumber port;

        public PortCriterion(PortNumber port) {
            this.port = port;
        }

        @Override
        public Type type() {
            return Type.IN_PORT;
        }

        public PortNumber port() {
            return this.port;
        }

        @Override
        public String toString() {
            return toStringHelper(type().toString())
                    .add("port", port).toString();
        }

        @Override
        public int hashCode() {
            return Objects.hash(port);
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj instanceof PortCriterion) {
                PortCriterion that = (PortCriterion) obj;
                return Objects.equals(port, that.port);

            }
            return false;
        }

    }


    public static final class EthCriterion implements Criterion {
        private final MacAddress mac;
        private final Type type;

        public EthCriterion(MacAddress mac, Type type) {
            this.mac = mac;
            this.type = type;
        }

        @Override
        public Type type() {
            return this.type;
        }

        public MacAddress mac() {
            return this.mac;
        }

        @Override
        public String toString() {
            return toStringHelper(type().toString())
                    .add("mac", mac).toString();
        }

        @Override
        public int hashCode() {
            return Objects.hash(mac, type);
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj instanceof EthCriterion) {
                EthCriterion that = (EthCriterion) obj;
                return Objects.equals(mac, that.mac) &&
                        Objects.equals(type, that.type);


            }
            return false;
        }


    }

    public static final class EthTypeCriterion implements Criterion {

        private final Short ethType;

        public EthTypeCriterion(Short ethType) {
            this.ethType = ethType;
        }

        @Override
        public Type type() {
            return Type.ETH_TYPE;
        }

        public Short ethType() {
            return ethType;
        }

        @Override
        public String toString() {
            return toStringHelper(type().toString())
                    .add("ethType", Long.toHexString(ethType)).toString();
        }

        @Override
        public int hashCode() {
            return Objects.hash(ethType);
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj instanceof EthTypeCriterion) {
                EthTypeCriterion that = (EthTypeCriterion) obj;
                return Objects.equals(ethType, that.ethType);


            }
            return false;
        }

    }


    public static final class IPCriterion implements Criterion {

        private final IpPrefix ip;
        private final Type type;

        public IPCriterion(IpPrefix ip, Type type) {
            this.ip = ip;
            this.type = type;
        }

        @Override
        public Type type() {
            return this.type;
        }

        public IpPrefix ip() {
            return this.ip;
        }

        @Override
        public String toString() {
            return toStringHelper(type().toString())
                    .add("ip", ip).toString();
        }

        @Override
        public int hashCode() {
            return Objects.hash(ip, type);
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj instanceof IPCriterion) {
                IPCriterion that = (IPCriterion) obj;
                return Objects.equals(ip, that.ip) &&
                        Objects.equals(type, that.type);


            }
            return false;
        }

    }


    public static final class IPProtocolCriterion implements Criterion {

        private final Byte proto;

        public IPProtocolCriterion(Byte protocol) {
            this.proto = protocol;
        }

        @Override
        public Type type() {
            return Type.IP_PROTO;
        }

        public Byte protocol() {
            return proto;
        }

        @Override
        public String toString() {
            return toStringHelper(type().toString())
                    .add("protocol", Long.toHexString(proto)).toString();
        }

        @Override
        public int hashCode() {
            return Objects.hash(proto);
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj instanceof IPProtocolCriterion) {
                IPProtocolCriterion that = (IPProtocolCriterion) obj;
                return Objects.equals(proto, that.proto);


            }
            return false;
        }

    }


    public static final class VlanPcpCriterion implements Criterion {

        private final Byte vlanPcp;

        public VlanPcpCriterion(Byte vlanPcp) {
            this.vlanPcp = vlanPcp;
        }

        @Override
        public Type type() {
            return Type.VLAN_PCP;
        }

        public Byte priority() {
            return vlanPcp;
        }

        @Override
        public String toString() {
            return toStringHelper(type().toString())
                    .add("pcp", Long.toHexString(vlanPcp)).toString();
        }

        @Override
        public int hashCode() {
            return Objects.hash(vlanPcp);
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj instanceof VlanPcpCriterion) {
                VlanPcpCriterion that = (VlanPcpCriterion) obj;
                return Objects.equals(vlanPcp, that.vlanPcp);


            }
            return false;
        }

    }


    public static final class VlanIdCriterion implements Criterion {


        private final VlanId vlanId;

        public VlanIdCriterion(VlanId vlanId) {
            this.vlanId = vlanId;
        }

        @Override
        public Type type() {
            return Type.VLAN_VID;
        }

        public VlanId vlanId() {
            return vlanId;
        }

        @Override
        public String toString() {
            return toStringHelper(type().toString())
                    .add("id", vlanId).toString();
        }

        @Override
        public int hashCode() {
            return Objects.hash(vlanId);
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj instanceof VlanIdCriterion) {
                VlanIdCriterion that = (VlanIdCriterion) obj;
                return Objects.equals(vlanId, that.vlanId);


            }
            return false;
        }

    }


}