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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.hive;

import java.util.List;
import java.util.Map;

import org.apache.hadoop.hive.serde2.objectinspector.ListObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.MapObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructField;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.io.Writable;
import org.elasticsearch.hadoop.cfg.Settings;
import org.elasticsearch.hadoop.serialization.Generator;
import org.elasticsearch.hadoop.serialization.builder.FilteringValueWriter;
import org.elasticsearch.hadoop.util.FieldAlias;

/**
 * Main value writer for hive. However since Hive expects a Writable type to be passed to the record reader,
 * the raw JSON data needs to be wrapped (and unwrapped by {@link HiveBytesArrayWritable}).
 */
public class HiveValueWriter extends FilteringValueWriter {

    private final boolean writeUnknownTypes;
    private final HiveWritableValueWriter writableWriter;
    private FieldAlias alias;

    public HiveValueWriter() {
        this.writeUnknownTypes = false;
        this.writableWriter = new HiveWritableValueWriter(false);
        this.alias = new FieldAlias(true);
    }

    @Override
    public Result write(HiveType type, Generator generator) {
        return write(type.getObject(), type.getObjectInspector(), generator);
    }

    private Result write(Object data, ObjectInspector oi, Generator generator) {
        if (data == null) {
            generator.writeNull();
            return Result.SUCCESFUL();
        }

        switch (oi.getCategory()) {
        case PRIMITIVE:
            Writable writable = (Writable) ((PrimitiveObjectInspector) oi).getPrimitiveWritableObject(data);
            return writableWriter.write(writable, generator);

        case LIST: // or ARRAY
            ListObjectInspector loi = (ListObjectInspector) oi;
            generator.writeBeginArray();

            for (int i = 0; i < loi.getListLength(data); i++) {
                Result result = write(loi.getListElement(data, i), loi.getListElementObjectInspector(), generator);
                if (!result.isSuccesful()) {
                    return result;
                }
            }
            generator.writeEndArray();

            break;

        case MAP:
            MapObjectInspector moi = (MapObjectInspector) oi;

            generator.writeBeginObject();
            for (Map.Entry entry : moi.getMap(data).entrySet()) {
                //write(entry.getKey(), mapType.getMapKeyTypeInfo(), generator);
                // TODO: handle non-strings

                String actualFieldName = alias.toES(entry.getKey().toString());

                // filter out fields
                if (shouldKeep(generator.getParentPath(), actualFieldName)) {
                    generator.writeFieldName(actualFieldName);
                    Result result = write(entry.getValue(), moi.getMapValueObjectInspector(), generator);
                    if (!result.isSuccesful()) {
                        return result;
                    }
                }
            }
            generator.writeEndObject();

            break;

        case STRUCT:
            StructObjectInspector soi = (StructObjectInspector) oi;

            List refs = soi.getAllStructFieldRefs();

            generator.writeBeginObject();
            for (StructField structField : refs) {
                String actualFieldName = alias.toES(structField.getFieldName());
                if (shouldKeep(generator.getParentPath(), actualFieldName)) {
                    generator.writeFieldName(actualFieldName);
                    Result result = write(soi.getStructFieldData(data, structField),
                            structField.getFieldObjectInspector(), generator);
                    if (!result.isSuccesful()) {
                        return result;
                    }
                }
            }
            generator.writeEndObject();
            break;

        case UNION:
            //UnionObjectInspector uoi = (UnionObjectInspector) oi;
            throw new UnsupportedOperationException("union not yet supported");//break;


        default:
            if (writeUnknownTypes) {
                return handleUnknown(data, oi, generator);
            }
            return Result.FAILED(data);
        }

        return Result.SUCCESFUL();
    }


    protected Result handleUnknown(Object value, ObjectInspector oi, Generator generator) {
        return org.elasticsearch.hadoop.serialization.builder.ValueWriter.Result.FAILED(value);
    }

    @Override
    public void setSettings(Settings settings) {
        super.setSettings(settings);
        alias = HiveUtils.alias(settings);
        writableWriter.setSettings(settings);
    }
}