/*
 * Copyright 2014, Stratio.
 *
 * 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 com.stratio.cassandra.index.schema.mapping;

import com.google.common.base.Objects;
import org.apache.cassandra.db.marshal.*;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.IntField;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.SortField.Type;
import org.codehaus.jackson.annotate.JsonCreator;
import org.codehaus.jackson.annotate.JsonProperty;

/**
 * A {@link ColumnMapper} to map an integer field.
 *
 * @author Andres de la Pena <adelapena@stratio.com>
 */
public class ColumnMapperInteger extends ColumnMapperSingle<Integer> {

    /** The default boost. */
    public static final Float DEFAULT_BOOST = 1.0f;

    /** The boost. */
    private final Float boost;

    /**
     * Builds a new {@link ColumnMapperInteger} using the specified boost.
     *
     * @param boost The boost to be used.
     */
    @JsonCreator
    public ColumnMapperInteger(@JsonProperty("boost") Float boost) {
        super(new AbstractType<?>[]{AsciiType.instance,
                                    UTF8Type.instance,
                                    Int32Type.instance,
                                    LongType.instance,
                                    IntegerType.instance,
                                    FloatType.instance,
                                    DoubleType.instance,
                                    DecimalType.instance}, new AbstractType[]{Int32Type.instance});
        this.boost = boost == null ? DEFAULT_BOOST : boost;
    }

    /** {@inheritDoc} */
    @Override
    public Integer indexValue(String name, Object value) {
        if (value == null) {
            return null;
        } else if (value instanceof Number) {
            return ((Number) value).intValue();
        } else if (value instanceof String) {
            String svalue = (String) value;
            try {
                return Double.valueOf(svalue).intValue();
            } catch (NumberFormatException e) {
                String message = String.format("Field %s requires a base 10 integer, but found \"%s\"", name, svalue);
                throw new IllegalArgumentException(message);
            }
        } else {
            String message = String.format("Field %s requires a base 10 integer, but found \"%s\"", name, value);
            throw new IllegalArgumentException(message);
        }
    }

    /** {@inheritDoc} */
    @Override
    public Integer queryValue(String name, Object value) {
        return indexValue(name, value);
    }

    /** {@inheritDoc} */
    @Override
    public Field field(String name, Object value) {
        Integer number = indexValue(name, value);
        Field field = new IntField(name, number, STORE);
        field.setBoost(boost);
        return field;
    }

    /** {@inheritDoc} */
    @Override
    public SortField sortField(String field, boolean reverse) {
        return new SortField(field, Type.INT, reverse);
    }

    /** {@inheritDoc} */
    @Override
    public Class<Integer> baseClass() {
        return Integer.class;
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("boost", boost).toString();
    }

}