/*
 * 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.gora.elasticsearch.mapping;

import java.util.Objects;
import java.util.StringJoiner;

/**
 * Field definition for the Elasticsearch index.
 */
public class Field {

    private String name;
    private FieldType dataType;

    /**
     * Constructor for Field.
     *
     * @param name Field's name
     * @param dataType Field's data type
     */
    public Field(String name, FieldType dataType) {
        this.name = name;
        this.dataType = dataType;
    }

    /**
     * Returns the field's name.
     *
     * @return Field's name
     */
    public String getName() {
        return name;
    }

    /**
     * Sets the field's name.
     *
     * @param name Field's name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * Returns the field's data-type.
     *
     * @return Field's data-type
     */
    public FieldType getDataType() {
        return dataType;
    }

    /**
     * Sets the field's data-type.
     *
     * @param dataType Field's data-type
     */
    public void setDataType(FieldType dataType) {
        this.dataType = dataType;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Field field = (Field) o;
        return Objects.equals(name, field.name) && Objects.equals(dataType, field.dataType);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, dataType);
    }

    @Override
    public String toString() {
        return new StringJoiner(", ", Field.class.getSimpleName() + "[", "]")
                .add("name='" + name + "'")
                .add("dataType=" + dataType)
                .toString();
    }

    /**
     * Elasticsearch supported data-type enumeration. For a more detailed list of data
     * types supported by Elasticsearch refer to
     * https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-types.html
     */
    public enum DataType {
        BINARY,
        BOOLEAN,
        KEYWORD,
        CONSTANT_KEYWORD,
        WILDCARD,
        LONG,
        INTEGER,
        SHORT,
        BYTE,
        DOUBLE,
        FLOAT,
        HALF_FLOAT,
        SCALED_FLOAT,
        OBJECT,
        FLATTENED,
        NESTED,
        TEXT,
        COMPLETION,
        SEARCH_AS_YOU_TYPE,
        TOKEN_COUNT
    }

    public static class FieldType {

        private DataType type;

        // Parameter for scaled_float type.
        private int scalingFactor;

        /**
         * Constructor for FieldType.
         *
         * @param type Elasticsearch data type
         */
        public FieldType(DataType type) {
            this.type = type;
        }

        /**
         * Constructor for FieldType Implicitly uses scaled_float Elasticsearch data type
         * with scaling factor parameter.
         *
         * @param scalingFactor scaled_float field's scaling factor
         */
        public FieldType(int scalingFactor) {
            this.type = DataType.SCALED_FLOAT;
            this.scalingFactor = scalingFactor;
        }

        /**
         *
         * @return Elasticsearch data type
         */
        public DataType getType() {
            return type;
        }

        /**
         *
         * @param type Elasticsearch data type
         */
        public void setType(DataType type) {
            this.type = type;
        }

        /**
         * Returns the scaling factor of scaled_float type.
         *
         * @return scaled_float field's scaling factor
         */
        public int getScalingFactor() {
            return scalingFactor;
        }

        /**
         * Sets the scaling factor of scaled_float type.
         *
         * @param scalingFactor scaled_float field's scaling factor
         */
        public void setScalingFactor(int scalingFactor) {
            this.scalingFactor = scalingFactor;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            FieldType fieldType = (FieldType) o;
            return scalingFactor == fieldType.scalingFactor && type == fieldType.type;
        }

        @Override
        public int hashCode() {
            return Objects.hash(type, scalingFactor);
        }
    }
}