/*
 * 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.protocol.pcep.spi;

import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;

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

/**
 * Bidirectional mapping of {@link org.opendaylight.protocol.pcep.spi.PCEPErrors PCEPErrors} and
 * {@link org.opendaylight.protocol.pcep.impl.object.PCEPErrorObjectParser.PCEPErrorIdentifier ErrorIdentifier}
 */
public final class PCEPErrorMapping {

    private static final Logger LOG = LoggerFactory.getLogger(PCEPErrorMapping.class);

    /**
     * Caret for combination of Error-type and Error-value
     */
    public static final class PCEPErrorIdentifier {
        private final short type;
        private final short value;

        private PCEPErrorIdentifier(final short type, final short value) {
            this.type = type;
            this.value = value;
        }

        public short getType() {
            return type;
        }

        public short getValue() {
            return value;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + this.type;
            result = prime * result + this.value;
            return result;
        }

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

        @Override
        public String toString() {
            return "type " + this.type + " value " + this.value;
        }
    }

    private static final PCEPErrorMapping INSTANCE = new PCEPErrorMapping();

    private final Map<PCEPErrors, PCEPErrorIdentifier> errorsMap = new HashMap<PCEPErrors, PCEPErrorIdentifier>();
    private final Map<PCEPErrorIdentifier, PCEPErrors> errorIdsMap = new HashMap<PCEPErrorIdentifier, PCEPErrors>();

    private PCEPErrorMapping() {
        this.fillIn();
    }

    private void fillIn() {
        this.fillIn(new PCEPErrorIdentifier((short) 1, (short) 1), PCEPErrors.NON_OR_INVALID_OPEN_MSG);
        this.fillIn(new PCEPErrorIdentifier((short) 1, (short) 2), PCEPErrors.NO_OPEN_BEFORE_EXP_OPENWAIT);
        this.fillIn(new PCEPErrorIdentifier((short) 1, (short) 3), PCEPErrors.NON_ACC_NON_NEG_SESSION_CHAR);
        this.fillIn(new PCEPErrorIdentifier((short) 1, (short) 4), PCEPErrors.NON_ACC_NEG_SESSION_CHAR);
        this.fillIn(new PCEPErrorIdentifier((short) 1, (short) 5), PCEPErrors.SECOND_OPEN_MSG);
        this.fillIn(new PCEPErrorIdentifier((short) 1, (short) 6), PCEPErrors.PCERR_NON_ACC_SESSION_CHAR);
        this.fillIn(new PCEPErrorIdentifier((short) 1, (short) 7), PCEPErrors.NO_MSG_BEFORE_EXP_KEEPWAIT);
        this.fillIn(new PCEPErrorIdentifier((short) 1, (short) 8), PCEPErrors.PCEP_VERSION_NOT_SUPPORTED);

        this.fillIn(new PCEPErrorIdentifier((short) 2, (short) 0), PCEPErrors.CAPABILITY_NOT_SUPPORTED);

        this.fillIn(new PCEPErrorIdentifier((short) 3, (short) 1), PCEPErrors.UNRECOGNIZED_OBJ_CLASS);
        this.fillIn(new PCEPErrorIdentifier((short) 3, (short) 2), PCEPErrors.UNRECOGNIZED_OBJ_TYPE);

        this.fillIn(new PCEPErrorIdentifier((short) 4, (short) 1), PCEPErrors.NOT_SUPPORTED_OBJ_CLASS);
        this.fillIn(new PCEPErrorIdentifier((short) 4, (short) 2), PCEPErrors.NOT_SUPPORTED_OBJ_TYPE);

        this.fillIn(new PCEPErrorIdentifier((short) 5, (short) 1), PCEPErrors.C_BIT_SET);
        this.fillIn(new PCEPErrorIdentifier((short) 5, (short) 2), PCEPErrors.O_BIT_SET);
        this.fillIn(new PCEPErrorIdentifier((short) 5, (short) 3), PCEPErrors.OF_NOT_ALLOWED);
        this.fillIn(new PCEPErrorIdentifier((short) 5, (short) 4), PCEPErrors.OF_BIT_SET);
        this.fillIn(new PCEPErrorIdentifier((short) 5, (short) 5), PCEPErrors.GCO_NOT_ALLOWED);
        this.fillIn(new PCEPErrorIdentifier((short) 5, (short) 7), PCEPErrors.P2MP_COMPUTATION_NOT_ALLOWED);

        this.fillIn(new PCEPErrorIdentifier((short) 6, (short) 1), PCEPErrors.RP_MISSING);
        this.fillIn(new PCEPErrorIdentifier((short) 6, (short) 2), PCEPErrors.RRO_MISSING);
        this.fillIn(new PCEPErrorIdentifier((short) 6, (short) 3), PCEPErrors.END_POINTS_MISSING);
        this.fillIn(new PCEPErrorIdentifier((short) 6, (short) 8), PCEPErrors.LSP_MISSING);
        this.fillIn(new PCEPErrorIdentifier((short) 6, (short) 9), PCEPErrors.ERO_MISSING);
        this.fillIn(new PCEPErrorIdentifier((short) 6, (short) 10), PCEPErrors.SRP_MISSING);
        this.fillIn(new PCEPErrorIdentifier((short) 6, (short) 11), PCEPErrors.LSP_IDENTIFIERS_TLV_MISSING);

        this.fillIn(new PCEPErrorIdentifier((short) 6, (short) 13), PCEPErrors.LSP_CLEANUP_TLV_MISSING);
        this.fillIn(new PCEPErrorIdentifier((short) 6, (short) 14), PCEPErrors.SYMBOLIC_PATH_NAME_MISSING);

        this.fillIn(new PCEPErrorIdentifier((short) 7, (short) 0), PCEPErrors.SYNC_PATH_COMP_REQ_MISSING);

        this.fillIn(new PCEPErrorIdentifier((short) 8, (short) 0), PCEPErrors.UNKNOWN_REQ_REF);

        this.fillIn(new PCEPErrorIdentifier((short) 9, (short) 0), PCEPErrors.ATTEMPT_2ND_SESSION);

        this.fillIn(new PCEPErrorIdentifier((short) 10, (short) 1), PCEPErrors.P_FLAG_NOT_SET);

        this.fillIn(new PCEPErrorIdentifier((short) 12, (short) 1), PCEPErrors.UNSUPPORTED_CT);
        this.fillIn(new PCEPErrorIdentifier((short) 12, (short) 2), PCEPErrors.INVALID_CT);
        this.fillIn(new PCEPErrorIdentifier((short) 12, (short) 3), PCEPErrors.CT_AND_SETUP_PRIORITY_DO_NOT_FORM_TE_CLASS);

        this.fillIn(new PCEPErrorIdentifier((short) 15, (short) 1), PCEPErrors.INSUFFICIENT_MEMORY);
        this.fillIn(new PCEPErrorIdentifier((short) 15, (short) 2), PCEPErrors.GCO_NOT_SUPPORTED);

        this.fillIn(new PCEPErrorIdentifier((short) 16, (short) 1), PCEPErrors.CANNOT_SATISFY_P2MP_REQUEST_DUE_TO_INSUFFISIENT_MEMMORY);
        this.fillIn(new PCEPErrorIdentifier((short) 16, (short) 2), PCEPErrors.NOT_CAPPABLE_P2MP_COMPUTATION);

        this.fillIn(new PCEPErrorIdentifier((short) 17, (short) 1), PCEPErrors.P2MP_NOT_CAPPABLE_SATISFY_REQ_DUE_LT2);
        this.fillIn(new PCEPErrorIdentifier((short) 17, (short) 2), PCEPErrors.P2MP_NOT_CAPPABLE_SATISFY_REQ_DUE_LT3);
        this.fillIn(new PCEPErrorIdentifier((short) 17, (short) 3), PCEPErrors.P2MP_NOT_CAPPABLE_SATISFY_REQ_DUE_LT4);
        this.fillIn(new PCEPErrorIdentifier((short) 17, (short) 4), PCEPErrors.P2MP_NOT_CAPPABLE_SATISFY_REQ_DUE_INCONSISTENT_EP);

        this.fillIn(new PCEPErrorIdentifier((short) 18, (short) 1), PCEPErrors.P2MP_FRAGMENTATION_FAILRUE);

        this.fillIn(new PCEPErrorIdentifier((short) 19, (short) 1), PCEPErrors.UPDATE_REQ_FOR_NON_LSP);
        this.fillIn(new PCEPErrorIdentifier((short) 19, (short) 2), PCEPErrors.UPDATE_REQ_FOR_NO_STATEFUL);
        this.fillIn(new PCEPErrorIdentifier((short) 19, (short) 3), PCEPErrors.UNKNOWN_PLSP_ID);
        this.fillIn(new PCEPErrorIdentifier((short) 19, (short) 4), PCEPErrors.RESOURCE_LIMIT_EXCEEDED);
        this.fillIn(new PCEPErrorIdentifier((short) 19, (short) 6), PCEPErrors.LSP_LIMIT_EXCEEDED);
        this.fillIn(new PCEPErrorIdentifier((short) 19, (short) 7), PCEPErrors.DELEGATION_NON_REVOKABLE);
        this.fillIn(new PCEPErrorIdentifier((short) 19, (short) 8), PCEPErrors.NON_ZERO_PLSPID);

        this.fillIn(new PCEPErrorIdentifier((short) 20, (short) 1), PCEPErrors.CANNOT_PROCESS_STATE_REPORT);
        this.fillIn(new PCEPErrorIdentifier((short) 20, (short) 2), PCEPErrors.LSP_DB_VERSION_MISMATCH);
        this.fillIn(new PCEPErrorIdentifier((short) 20, (short) 3), PCEPErrors.DB_VERSION_TLV_MISSING_WHEN_SYNC_ALLOWED);
        this.fillIn(new PCEPErrorIdentifier((short) 20, (short) 5), PCEPErrors.CANNOT_COMPLETE_STATE_SYNC);

        this.fillIn(new PCEPErrorIdentifier((short) 23, (short) 1), PCEPErrors.USED_SYMBOLIC_PATH_NAME);

        this.fillIn(new PCEPErrorIdentifier((short) 24, (short) 1), PCEPErrors.LSP_UNACC_INST_PARAMS);
        this.fillIn(new PCEPErrorIdentifier((short) 24, (short) 2), PCEPErrors.LSP_INTERNAL_ERROR);
        this.fillIn(new PCEPErrorIdentifier((short) 24, (short) 3), PCEPErrors.LSP_RSVP_ERROR);
    }

    private void fillIn(final PCEPErrorIdentifier identifier, final PCEPErrors error) {
        this.errorsMap.put(error, identifier);
        this.errorIdsMap.put(identifier, error);
    }

    public PCEPErrorIdentifier getFromErrorsEnum(final PCEPErrors error) {
        final PCEPErrorIdentifier ei = this.errorsMap.get(error);
        if (ei == null) {
            LOG.debug("Unknown PCEPErrors type: {}.", error);
            throw new NoSuchElementException("Unknown PCEPErrors type: " + error);
        }
        return ei;
    }

    public PCEPErrors getFromErrorIdentifier(final PCEPErrorIdentifier identifier) {
        final PCEPErrors e = this.errorIdsMap.get(identifier);
        if (e == null) {
            LOG.debug("Unknown error type/value combination: {}.", identifier);
            throw new NoSuchElementException("Unknown error type/value combination: " + identifier);
        }
        return e;
    }

    public static PCEPErrorMapping getInstance() {
        return INSTANCE;
    }
}