/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.directmemory.lightning.internal;

import java.util.Arrays;
import java.util.List;

import org.apache.directmemory.lightning.internal.util.ClassUtil;
import org.apache.directmemory.lightning.internal.util.Crc64Util;
import org.apache.directmemory.lightning.internal.util.InternalUtil;
import org.apache.directmemory.lightning.logging.Logger;
import org.apache.directmemory.lightning.metadata.ClassDefinition;
import org.apache.directmemory.lightning.metadata.PropertyDescriptor;
import org.objectweb.asm.Type;

class InternalClassDefinition
    implements ClassDefinition, Comparable<ClassDefinition>
{

    private final String canonicalName;

    private final Class<?> type;

    private final byte[] checksum;

    private final long serialVersionUID;

    private long id;

    InternalClassDefinition( Class<?> type, List<PropertyDescriptor> propertyDescriptors, Logger logger )
    {
        this.canonicalName = Type.getInternalName( type ).replace( "/", "." );
        this.type = type;

        byte[] classData = ClassUtil.getClassBytes( !type.isArray() ? type : type.getComponentType() );
        this.checksum = InternalUtil.getChecksum( propertyDescriptors, logger );
        this.id = Crc64Util.checksum( classData );
        this.serialVersionUID = ClassUtil.calculateSerialVersionUID( type );
    }

    InternalClassDefinition( long id, Class<?> type, byte[] checksum, long serialVersionUID )
    {
        this.canonicalName = Type.getInternalName( type ).replace( "/", "." );
        this.type = type;
        this.id = id;
        this.checksum = checksum;
        this.serialVersionUID = serialVersionUID;
    }

    @Override
    public String getCanonicalName()
    {
        return canonicalName;
    }

    @Override
    public Class<?> getType()
    {
        return type;
    }

    @Override
    public byte[] getChecksum()
    {
        return Arrays.copyOf( checksum, checksum.length );
    }

    @Override
    public long getId()
    {
        return id;
    }

    @Override
    public long getSerialVersionUID()
    {
        return serialVersionUID;
    }

    @Override
    public int compareTo( ClassDefinition o )
    {
        return canonicalName.compareTo( o.getCanonicalName() );
    }

    @Override
    public int hashCode()
    {
        final int prime = 31;
        int result = 1;
        result = prime * result + ( ( canonicalName == null ) ? 0 : canonicalName.hashCode() );
        result = prime * result + Arrays.hashCode( checksum );
        result = prime * result + (int) ( id ^ ( id >>> 32 ) );
        result = prime * result + (int) ( serialVersionUID ^ ( serialVersionUID >>> 32 ) );
        return result;
    }

    @Override
    public boolean equals( Object obj )
    {
        if ( this == obj )
            return true;
        if ( obj == null )
            return false;
        if ( getClass() != obj.getClass() )
            return false;
        InternalClassDefinition other = (InternalClassDefinition) obj;
        if ( canonicalName == null )
        {
            if ( other.canonicalName != null )
                return false;
        }
        else if ( !canonicalName.equals( other.canonicalName ) )
            return false;
        if ( !Arrays.equals( checksum, other.checksum ) )
            return false;
        if ( id != other.id )
            return false;
        if ( serialVersionUID != other.serialVersionUID )
            return false;
        return true;
    }

    @Override
    public String toString()
    {
        return "InternalClassDefinition [canonicalName=" + canonicalName + ", type=" + type + ", checksum="
            + Arrays.toString( checksum ) + ", serialVersionUID=" + serialVersionUID + ", id=" + id + "]";
    }
}