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/*
 * 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 hivemall.tools.text;

import hivemall.utils.codec.Base91;
import hivemall.utils.hadoop.HiveUtils;
import hivemall.utils.io.FastByteArrayOutputStream;

import java.io.IOException;
import java.util.Arrays;

import javax.annotation.Nonnull;

import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.UDFType;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.StringObjectInspector;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Text;

@Description(name = "unbase91", value = "_FUNC_(string) - Convert a BASE91 string to a binary",
        extended = "SELECT inflate(unbase91(base91(deflate('aaaaaaaaaaaaaaaabbbbccc'))));\n"
                + " aaaaaaaaaaaaaaaabbbbccc")
@UDFType(deterministic = true, stateful = false)
public final class Unbase91UDF extends GenericUDF {

    private StringObjectInspector stringOI;

    @Nonnull
    private transient FastByteArrayOutputStream outputBuf;
    @Nonnull
    private transient BytesWritable result;

    @Override
    public ObjectInspector initialize(ObjectInspector[] argOIs) throws UDFArgumentException {
        if (argOIs.length != 1) {
            throw new UDFArgumentException("_FUNC_ takes exactly 1 argument");
        }
        this.stringOI = HiveUtils.asStringOI(argOIs[0]);

        return PrimitiveObjectInspectorFactory.writableBinaryObjectInspector;
    }

    @Override
    public BytesWritable evaluate(DeferredObject[] arguments) throws HiveException {
        if (outputBuf == null) {
            this.outputBuf = new FastByteArrayOutputStream(4096);
        } else {
            outputBuf.reset();
        }

        Object arg0 = arguments[0].get();
        if (arg0 == null) {
            return null;
        }

        Text input = stringOI.getPrimitiveWritableObject(arg0);
        final byte[] inputBytes = input.getBytes();
        final int len = input.getLength();
        try {
            Base91.decode(inputBytes, 0, len, outputBuf);
        } catch (IOException e) {
            throw new HiveException(e);
        }

        if (result == null) {
            byte[] outputBytes = outputBuf.toByteArray();
            this.result = new BytesWritable(outputBytes);
        } else {
            byte[] outputBytes = outputBuf.getInternalArray();
            int outputSize = outputBuf.size();
            result.set(outputBytes, 0, outputSize);
        }
        return result;
    }

    @Override
    public void close() throws IOException {
        this.outputBuf = null;
        this.result = null;
    }

    @Override
    public String getDisplayString(String[] children) {
        return "unbase91(" + Arrays.toString(children) + ')';
    }

}