/*
 * Copyright 2016 MongoDB, Inc.
 *
 * 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 org.mongodb.morphia;

import org.mongodb.morphia.annotations.Field;
import org.mongodb.morphia.annotations.Index;
import org.mongodb.morphia.annotations.IndexOptions;
import org.mongodb.morphia.utils.IndexType;

import java.util.ArrayList;
import java.util.List;

@SuppressWarnings("deprecation")
class IndexBuilder extends AnnotationBuilder<Index> implements Index {
    IndexBuilder() {
    }

    IndexBuilder(final Index original) {
        super(original);
    }

    static Index normalize(final Index index) {
        return index.fields().length != 0
               ? index
               : new IndexBuilder()
                   .migrate(index);
    }

    @Override
    public Class<Index> annotationType() {
        return Index.class;
    }

    public IndexBuilder fields(final String fields) {
        return fields(parseFieldsString(fields));
    }

    @Override
    public Field[] fields() {
        return get("fields");
    }

    @Override
    public IndexOptions options() {
        return get("options");
    }

    @Override
    public boolean background() {
        return get("background");
    }

    @Override
    public boolean disableValidation() {
        return get("disableValidation");
    }

    @Override
    public boolean dropDups() {
        return get("dropDups");
    }

    @Override
    public int expireAfterSeconds() {
        return get("expireAfterSeconds");
    }

    @Override
    public String name() {
        return get("name");
    }

    @Override
    public boolean sparse() {
        return get("sparse");
    }

    @Override
    public boolean unique() {
        return get("unique");
    }

    @Override
    public String value() {
        return get("value");
    }

    private List<Field> parseFieldsString(final String str) {
        List<Field> fields = new ArrayList<Field>();
        final String[] parts = str.split(",");
        for (String s : parts) {
            s = s.trim();
            IndexType dir = IndexType.ASC;

            if (s.startsWith("-")) {
                dir = IndexType.DESC;
                s = s.substring(1).trim();
            }

            fields.add(new FieldBuilder()
                           .value(s)
                           .type(dir));
        }
        return fields;
    }

    IndexBuilder fields(final List<Field> fields) {
        put("fields", fields.toArray(new Field[0]));
        return this;
    }

    IndexBuilder fields(final Field... fields) {
        put("fields", fields);
        return this;
    }

    
Options to apply to the index. Use of this field will ignore any of the deprecated options defined on Index directly. /**
     * Options to apply to the index.  Use of this field will ignore any of the deprecated options defined on {@link Index} directly.
     */
    IndexBuilder options(final IndexOptions options) {
        put("options", options);
        return this;
    }

    
Create the index in the background
/**
     * Create the index in the background
     */
    IndexBuilder background(final boolean background) {
        put("background", background);
        return this;
    }

    
disables validation for the field name
/**
     * disables validation for the field name
     */
    IndexBuilder disableValidation(final boolean disableValidation) {
        put("disableValidation", disableValidation);
        return this;
    }

    
Tells the unique index to drop duplicates silently when creating; only the first will be kept
/**
     * Tells the unique index to drop duplicates silently when creating; only the first will be kept
     */
    IndexBuilder dropDups(final boolean dropDups) {
        put("dropDups", dropDups);
        return this;
    }

    
defines the time to live for documents in the collection
/**
     * defines the time to live for documents in the collection
     */
    IndexBuilder expireAfterSeconds(final int expireAfterSeconds) {
        put("expireAfterSeconds", expireAfterSeconds);
        return this;
    }

    
The name of the index to create; default is to let the mongodb create a name (in the form of key1_1/-1_key2_1/-1...)
/**
     * The name of the index to create; default is to let the mongodb create a name (in the form of key1_1/-1_key2_1/-1...)
     */
    IndexBuilder name(final String name) {
        put("name", name);
        return this;
    }

    
Create the index with the sparse option
/**
     * Create the index with the sparse option
     */
    IndexBuilder sparse(final boolean sparse) {
        put("sparse", sparse);
        return this;
    }

    
Creates the index as a unique value index; inserting duplicates values in this field will cause errors
/**
     * Creates the index as a unique value index; inserting duplicates values in this field will cause errors
     */
    IndexBuilder unique(final boolean unique) {
        put("unique", unique);
        return this;
    }

    
List of fields (prepended with "-" for desc; defaults to asc).
/**
     * List of fields (prepended with "-" for desc; defaults to asc).
     */
    IndexBuilder value(final String value) {
        put("value", value);
        return this;
    }

    IndexBuilder migrate(final Index index) {
        return fields(parseFieldsString(index.value()))
            .options(new IndexOptionsBuilder().migrate(index));
    }
}