/*
 * 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.commons.sanselan.formats.tiff.write;

import java.io.IOException;

import org.apache.commons.sanselan.ImageWriteException;
import org.apache.commons.sanselan.common.BinaryOutputStream;
import org.apache.commons.sanselan.formats.tiff.constants.TiffConstants;
import org.apache.commons.sanselan.formats.tiff.fieldtypes.FieldType;
import org.apache.commons.sanselan.formats.tiff.taginfos.TagInfo;

public class TiffOutputField implements TiffConstants
{
    public final int tag;
    public final TagInfo tagInfo;
    public final FieldType fieldType;
    public final int count;

    private byte bytes[];

    private final TiffOutputItem.Value separateValueItem;

    public TiffOutputField(TagInfo tagInfo, FieldType tagtype, int count,
            byte bytes[])
    {
        this(tagInfo.tag, tagInfo, tagtype, count, bytes);
    }

    public TiffOutputField(final int tag, TagInfo tagInfo, FieldType fieldType,
            int count, byte bytes[])
    {
        this.tag = tag;
        this.tagInfo = tagInfo;
        this.fieldType = fieldType;
        this.count = count;
        this.bytes = bytes;

        if (isLocalValue())
            separateValueItem = null;
        else
        {
            String name = "Field Seperate value (" + tagInfo.getDescription()
                    + ")";
            separateValueItem = new TiffOutputItem.Value(name, bytes);
        }
    }

    private int sortHint = -1;

    protected static final TiffOutputField createOffsetField(TagInfo tagInfo,
            int byteOrder) throws ImageWriteException
    {
        return new TiffOutputField(tagInfo, FIELD_TYPE_LONG, 1, FIELD_TYPE_LONG
                .writeData(new int[] { 0, }, byteOrder));
    }

    protected void writeField(BinaryOutputStream bos) throws IOException,
            ImageWriteException
    {
        bos.write2Bytes(tag);
        bos.write2Bytes(fieldType.type);
        bos.write4Bytes(count);

        if (isLocalValue())
        {
            if (separateValueItem != null)
                throw new ImageWriteException("Unexpected separate value item.");
            if (bytes.length > 4)
                throw new ImageWriteException(
                        "Local value has invalid length: " + bytes.length);

            bos.writeByteArray(bytes);
            int remainder = TIFF_ENTRY_MAX_VALUE_LENGTH - bytes.length;
            for (int i = 0; i < remainder; i++)
                bos.write(0);
        } else
        {
            if (separateValueItem == null)
                throw new ImageWriteException("Missing separate value item.");

            bos.write4Bytes(separateValueItem.getOffset());
        }
    }

    protected TiffOutputItem getSeperateValue()
    {
        return separateValueItem;
    }

    protected boolean isLocalValue()
    {
        return bytes.length <= TIFF_ENTRY_MAX_VALUE_LENGTH;
    }

    protected void setData(byte bytes[]) throws ImageWriteException
    {
        // if(tagInfo.isUnknown())
        // Debug.debug("unknown tag(0x" + Integer.toHexString(tag)
        // + ") setData", bytes);

        if (this.bytes.length != bytes.length)
            throw new ImageWriteException("Cannot change size of value.");

        // boolean wasLocalValue = isLocalValue();
        this.bytes = bytes;
        if (separateValueItem != null)
            separateValueItem.updateValue(bytes);
        // if (isLocalValue() != wasLocalValue)
        // throw new Error("Bug. Locality disrupted! "
        // + tagInfo.getDescription());
    }

    private static final String newline = System.getProperty("line.separator");

    @Override
    public String toString()
    {
        return toString(null);
    }

    public String toString(String prefix)
    {
        if (prefix == null)
            prefix = "";
        StringBuffer result = new StringBuffer();

        result.append(prefix);
        result.append(tagInfo);
        result.append(newline);

        result.append(prefix);
        result.append("count: " + count);
        result.append(newline);

        result.append(prefix);
        result.append(fieldType);
        result.append(newline);

        return result.toString();
    }

    public int getSortHint()
    {
        return sortHint;
    }

    public void setSortHint(int sortHint)
    {
        this.sortHint = sortHint;
    }
}