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/*
 * Licensed to Elasticsearch 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.hadoop.mr;

import java.util.Map;
import java.util.Map.Entry;

import org.apache.hadoop.io.AbstractMapWritable;
import org.apache.hadoop.io.ArrayWritable;
import org.apache.hadoop.io.BooleanWritable;
import org.apache.hadoop.io.ByteWritable;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.MD5Hash;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.UTF8;
import org.apache.hadoop.io.VIntWritable;
import org.apache.hadoop.io.VLongWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;
import org.elasticsearch.hadoop.serialization.Generator;
import org.elasticsearch.hadoop.serialization.builder.FilteringValueWriter;

public class WritableValueWriter extends FilteringValueWriter {

    private final boolean writeUnknownTypes;

    public WritableValueWriter() {
        writeUnknownTypes = false;
    }

    public WritableValueWriter(boolean writeUnknownTypes) {
        this.writeUnknownTypes = writeUnknownTypes;
    }

    @Override
    @SuppressWarnings({ "unchecked", "deprecation" })
    public Result write(Writable writable, Generator generator) {
        if (writable == null || writable instanceof NullWritable) {
            generator.writeNull();
        }
        else if (writable instanceof Text) {
            Text text = (Text) writable;
            generator.writeUTF8String(text.getBytes(), 0, text.getLength());
        }
        else if (writable instanceof UTF8) {
            UTF8 utf8 = (UTF8) writable;
            generator.writeUTF8String(utf8.getBytes(), 0, utf8.getLength());
        }
        else if (WritableCompatUtil.isShortWritable(writable)) {
            generator.writeNumber(WritableCompatUtil.unwrap(writable));
        }
        else if (writable instanceof IntWritable) {
            generator.writeNumber(((IntWritable) writable).get());
        }
        else if (writable instanceof LongWritable) {
            generator.writeNumber(((LongWritable) writable).get());
        }
        else if (writable instanceof VLongWritable) {
            generator.writeNumber(((VLongWritable) writable).get());
        }
        else if (writable instanceof VIntWritable) {
            generator.writeNumber(((VIntWritable) writable).get());
        }
        else if (writable instanceof ByteWritable) {
            generator.writeNumber(((ByteWritable) writable).get());
        }
        else if (writable instanceof DoubleWritable) {
            generator.writeNumber(((DoubleWritable) writable).get());
        }
        else if (writable instanceof FloatWritable) {
            generator.writeNumber(((FloatWritable) writable).get());
        }
        else if (writable instanceof BooleanWritable) {
            generator.writeBoolean(((BooleanWritable) writable).get());
        }
        else if (writable instanceof BytesWritable) {
            BytesWritable bw = (BytesWritable) writable;
            generator.writeBinary(bw.getBytes(), 0, bw.getLength());
        }
        else if (writable instanceof MD5Hash) {
            generator.writeString(writable.toString());
        }

        else if (writable instanceof ArrayWritable) {
            generator.writeBeginArray();
            for (Writable wrt : ((ArrayWritable) writable).get()) {
                Result result = write(wrt, generator);
                if (!result.isSuccesful()) {
                    return result;
                }
            }
            generator.writeEndArray();
        }

        else if (writable instanceof AbstractMapWritable) {
            Map map = (Map) writable;

            generator.writeBeginObject();
            // ignore handling sets (which are just maps with null values)
            for (Entry entry : map.entrySet()) {
                String fieldName = entry.getKey().toString();
                if (shouldKeep(generator.getParentPath(), fieldName)) {
                    generator.writeFieldName(fieldName);
                    Result result = write(entry.getValue(), generator);

                    if (!result.isSuccesful()) {
                        return result;
                    }
                }
            }
            generator.writeEndObject();
        }
        else {
            if (writeUnknownTypes) {
                return handleUnknown(writable, generator);
            }
            return Result.FAILED(writable);
        }
        return Result.SUCCESFUL();
    }

    protected Result handleUnknown(Writable value, Generator generator) {
        generator.writeBinary(WritableUtils.toByteArray(value));
        return Result.SUCCESFUL();
    }
}