/*
 * Copyright 2011-17 Fraunhofer ISE, energy & meteo Systems GmbH and other contributors
 *
 * 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.openmuc.openiec61850;

import org.openmuc.openiec61850.internal.mms.asn1.Data;
import org.openmuc.openiec61850.internal.mms.asn1.Integer32;
import org.openmuc.openiec61850.internal.mms.asn1.MMSString;
import org.openmuc.openiec61850.internal.mms.asn1.TypeDescription;

public final class BdaUnicodeString extends BasicDataAttribute {

    private byte[] value;
    private final int maxLength;

    public BdaUnicodeString(ObjectReference objectReference, Fc fc, String sAddr, int maxLength, boolean dchg,
            boolean dupd) {
        super(objectReference, fc, sAddr, dchg, dupd);
        basicType = BdaType.UNICODE_STRING;
        this.maxLength = maxLength;
        setDefault();
    }

    public byte[] getValue() {
        return value;
    }

    public void setValue(byte[] value) {
        if (value == null || value.length > maxLength) {
            throw new IllegalArgumentException(
                    "Value was null or UNICODE_STRING value size exceeds maxLength of " + maxLength);
        }
        this.value = value;
    }

    @Override
    void setValueFrom(BasicDataAttribute bda) {
        byte[] srcValue = ((BdaUnicodeString) bda).getValue();
        if (value.length != srcValue.length) {
            value = new byte[srcValue.length];
        }
        System.arraycopy(srcValue, 0, value, 0, srcValue.length);
    }

    public int getMaxLength() {
        return maxLength;
    }

    @Override
    public void setDefault() {
        value = new byte[0];
    }

    @Override
    public BdaUnicodeString copy() {
        BdaUnicodeString copy = new BdaUnicodeString(objectReference, fc, sAddr, maxLength, dchg, dupd);
        byte[] valueCopy = new byte[value.length];
        System.arraycopy(value, 0, valueCopy, 0, value.length);
        copy.setValue(valueCopy);
        if (mirror == null) {
            copy.mirror = this;
        }
        else {
            copy.mirror = mirror;
        }
        return copy;
    }

    @Override
    Data getMmsDataObj() {
        Data data = new Data();
        data.setMMSString(new MMSString(value));
        return data;
    }

    @Override
    void setValueFromMmsDataObj(Data data) throws ServiceError {
        if (data.getMMSString() == null) {
            throw new ServiceError(ServiceError.TYPE_CONFLICT, "expected type: mms_string/unicode_string");
        }
        value = data.getMMSString().value;
    }

    @Override
    TypeDescription getMmsTypeSpec() {
        TypeDescription typeDescription = new TypeDescription();
        typeDescription.setMMSString(new Integer32(maxLength * -1));
        return typeDescription;
    }

    @Override
    public String toString() {
        if (value == null) {
            return getReference().toString() + ": null";
        }
        return getReference().toString() + ": " + new String(value);
    }

}