/*
 * Licensed to ElasticSearch and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. ElasticSearch licenses this
 * file to you 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.elasticsearch.index.mapper;

import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.bytes.HashedBytesArray;

/**
 *
 */
public final class Uid {

    public static final char DELIMITER = '#';
    public static final byte DELIMITER_BYTE = 0x23;
    public static final BytesRef DELIMITER_BYTES = new BytesRef(new byte[]{DELIMITER_BYTE});

    private final String type;

    private final String id;

    public Uid(String type, String id) {
        this.type = type;
        this.id = id;
    }

    public String type() {
        return type;
    }

    public String id() {
        return id;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Uid uid = (Uid) o;

        if (id != null ? !id.equals(uid.id) : uid.id != null) return false;
        if (type != null ? !type.equals(uid.type) : uid.type != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = type != null ? type.hashCode() : 0;
        result = 31 * result + (id != null ? id.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return type + DELIMITER + id;
    }

    public static String typePrefix(String type) {
        return type + DELIMITER;
    }

    public static String idFromUid(String uid) {
        int delimiterIndex = uid.indexOf(DELIMITER); // type is not allowed to have # in it..., ids can
        return uid.substring(delimiterIndex + 1);
    }

    public static HashedBytesArray idFromUid(BytesRef uid) {
        return splitUidIntoTypeAndId(uid)[1];
    }

    public static HashedBytesArray typeFromUid(BytesRef uid) {
        return splitUidIntoTypeAndId(uid)[0];
    }

    public static String typeFromUid(String uid) {
        int delimiterIndex = uid.indexOf(DELIMITER); // type is not allowed to have # in it..., ids can
        return uid.substring(0, delimiterIndex);
    }

    public static Uid createUid(String uid) {
        int delimiterIndex = uid.indexOf(DELIMITER); // type is not allowed to have # in it..., ids can
        return new Uid(uid.substring(0, delimiterIndex), uid.substring(delimiterIndex + 1));
    }

    public static BytesRef createUidAsBytes(String type, String id) {
        BytesRef ref = new BytesRef(type.length() + 1 + id.length());
        ref.copyChars(type);
        ref.copyBytes(DELIMITER_BYTES);
        ref.copyChars(id);
        return ref;
    }

    public static String createUid(String type, String id) {
        return createUid(new StringBuilder(), type, id);
    }

    public static String createUid(StringBuilder sb, String type, String id) {
        return sb.append(type).append(DELIMITER).append(id).toString();
    }

    // LUCENE 4 UPGRADE: HashedBytesArray or BytesRef as return type?
    public static HashedBytesArray[] splitUidIntoTypeAndId(BytesRef uid) {
        int loc = -1;
        for (int i = uid.offset; i < uid.length; i++) {
            if (uid.bytes[i] == DELIMITER_BYTE) { // 0x23 is equal to '#'
                loc = i;
                break;
            }
        }

        if (loc == -1) {
            return null;
        }

        byte[] type = new byte[loc - uid.offset];
        System.arraycopy(uid.bytes, uid.offset, type, 0, type.length);

        byte[] id = new byte[uid.length - type.length - 1];
        System.arraycopy(uid.bytes, loc + 1, id, 0, id.length);
        return new HashedBytesArray[]{new HashedBytesArray(type), new HashedBytesArray(id)};
    }

}

@@ -3265,17 +3265,14 @@
 ref.
-copyBytes
+append
 (DEL
@@ -3302,21 +3302,32 @@
 ref.
-copyChars
+append(new BytesRef
 (id)
+)
 ;%0A  

fix creating uid to bytes