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//
// Copyright (c) 2020, 2017 Couchbase, Inc All rights reserved.
//
// 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.couchbase.lite;

import android.support.annotation.NonNull;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;


/**
 * Index for Full-Text search
 */
public final class FullTextIndex extends AbstractIndex {

    private static String getDefaultLanguage() { return Locale.getDefault().getLanguage(); }


    private final List indexItems;

    private String textLanguage = getDefaultLanguage();
    private boolean shouldIgnoreAccents;

    FullTextIndex(FullTextIndexItem... indexItems) { this.indexItems = Arrays.asList(indexItems); }

    /**
     * The language code which is an ISO-639 language such as "en", "fr", etc.
     * Setting the language code affects how word breaks and word stems are parsed.
     * Without setting the value, the current locale's language will be used. Setting
     * a nil or "" value to disable the language features.
     */
    @NonNull
    public FullTextIndex setLanguage(String language) {
        this.textLanguage = language;
        return this;
    }

    /**
     * Set the true value to ignore accents/diacritical marks. The default value is false.
     */
    @NonNull
    public FullTextIndex ignoreAccents(boolean ignoreAccents) {
        this.shouldIgnoreAccents = ignoreAccents;
        return this;
    }

    @NonNull
    @Override
    IndexType type() { return IndexType.FullText; }

    @Override
    String language() { return textLanguage; }

    @Override
    boolean ignoreAccents() { return shouldIgnoreAccents; }

    @NonNull
    @Override
    List items() {
        final List items = new ArrayList<>();
        for (FullTextIndexItem item : indexItems) { items.add(item.expression.asJSON()); }
        return items;
    }
}