/*
 * 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 java.nio.ByteBuffer;

import org.openmuc.openiec61850.internal.mms.asn1.Data;
import org.openmuc.openiec61850.internal.mms.asn1.FloatingPoint;
import org.openmuc.openiec61850.internal.mms.asn1.TypeDescription;
import org.openmuc.openiec61850.internal.mms.asn1.Unsigned8;

public final class BdaFloat32 extends BasicDataAttribute {

    private byte[] value;

    public BdaFloat32(ObjectReference objectReference, Fc fc, String sAddr, boolean dchg, boolean dupd) {
        super(objectReference, fc, sAddr, dchg, dupd);
        basicType = BdaType.FLOAT32;
        setDefault();
    }

    public void setValue(byte[] value) {
        this.value = value;
    }

    @Override
    void setValueFrom(BasicDataAttribute bda) {
        byte[] srcValue = ((BdaFloat32) bda).getValue();
        if (value.length != srcValue.length) {
            value = new byte[srcValue.length];
        }
        System.arraycopy(srcValue, 0, value, 0, srcValue.length);
    }

    public void setFloat(Float value) {
        this.value = ByteBuffer.allocate(1 + 4).put((byte) 8).putFloat(value).array();
    }

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

    public Float getFloat() {
        return Float.intBitsToFloat(((0xff & value[1]) << 24) | ((0xff & value[2]) << 16) | ((0xff & value[3]) << 8)
                | ((0xff & value[4]) << 0));
    }

    @Override
    public void setDefault() {
        value = new byte[] { 8, 0, 0, 0, 0 };
    }

    @Override
    public BdaFloat32 copy() {
        BdaFloat32 copy = new BdaFloat32(objectReference, fc, sAddr, 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() {
        if (value == null) {
            return null;
        }
        Data data = new Data();
        data.setFloatingPoint(new FloatingPoint(value));
        return data;
    }

    @Override
    void setValueFromMmsDataObj(Data data) throws ServiceError {
        if (data.getFloatingPoint() == null || data.getFloatingPoint().value.length != 5) {
            throw new ServiceError(ServiceError.TYPE_CONFLICT,
                    "expected type: floating_point as an octet string of size 5");
        }
        value = data.getFloatingPoint().value;
    }

    @Override
    TypeDescription getMmsTypeSpec() {
        TypeDescription.FloatingPoint floatingPointTypeDescription = new TypeDescription.FloatingPoint();
        floatingPointTypeDescription.setFormatWidth(new Unsigned8(32));
        floatingPointTypeDescription.setExponentWidth(new Unsigned8(8));

        TypeDescription typeDescription = new TypeDescription();
        typeDescription.setFloatingPoint(floatingPointTypeDescription);
        return typeDescription;
    }

    @Override
    public String toString() {
        return getReference().toString() + ": " + getFloat();
    }

}