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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.index.analysis;

import org.elasticsearch.common.settings.Settings;

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

/**
 * A class that groups analysis components necessary to produce a custom analyzer.
 * See {@link ReloadableCustomAnalyzer} for an example usage.
 */
public final class AnalyzerComponents {

    private final TokenizerFactory tokenizerFactory;
    private final CharFilterFactory[] charFilters;
    private final TokenFilterFactory[] tokenFilters;
    private final AnalysisMode analysisMode;

    AnalyzerComponents(TokenizerFactory tokenizerFactory, CharFilterFactory[] charFilters,
                       TokenFilterFactory[] tokenFilters) {

        this.tokenizerFactory = tokenizerFactory;
        this.charFilters = charFilters;
        this.tokenFilters = tokenFilters;
        AnalysisMode mode = AnalysisMode.ALL;
        for (TokenFilterFactory f : tokenFilters) {
            mode = mode.merge(f.getAnalysisMode());
        }
        this.analysisMode = mode;
    }

    static AnalyzerComponents createComponents(String name, Settings analyzerSettings, final Map tokenizers,
            final Map charFilters, final Map tokenFilters) {
        String tokenizerName = analyzerSettings.get("tokenizer");
        if (tokenizerName == null) {
            throw new IllegalArgumentException("Custom Analyzer [" + name + "] must be configured with a tokenizer");
        }

        TokenizerFactory tokenizer = tokenizers.get(tokenizerName);
        if (tokenizer == null) {
            throw new IllegalArgumentException(
                    "Custom Analyzer [" + name + "] failed to find tokenizer under name " + "[" + tokenizerName + "]");
        }

        List charFilterNames = analyzerSettings.getAsList("char_filter");
        List charFiltersList = new ArrayList<>(charFilterNames.size());
        for (String charFilterName : charFilterNames) {
            CharFilterFactory charFilter = charFilters.get(charFilterName);
            if (charFilter == null) {
                throw new IllegalArgumentException(
                        "Custom Analyzer [" + name + "] failed to find char_filter under name " + "[" + charFilterName + "]");
            }
            charFiltersList.add(charFilter);
        }

        List tokenFilterNames = analyzerSettings.getAsList("filter");
        List tokenFilterList = new ArrayList<>(tokenFilterNames.size());
        for (String tokenFilterName : tokenFilterNames) {
            TokenFilterFactory tokenFilter = tokenFilters.get(tokenFilterName);
            if (tokenFilter == null) {
                throw new IllegalArgumentException(
                        "Custom Analyzer [" + name + "] failed to find filter under name " + "[" + tokenFilterName + "]");
            }
            tokenFilter = tokenFilter.getChainAwareTokenFilterFactory(tokenizer, charFiltersList, tokenFilterList, tokenFilters::get);
            tokenFilterList.add(tokenFilter);
        }

        return new AnalyzerComponents(tokenizer, charFiltersList.toArray(new CharFilterFactory[charFiltersList.size()]),
                tokenFilterList.toArray(new TokenFilterFactory[tokenFilterList.size()]));
    }

    public TokenizerFactory getTokenizerFactory() {
        return tokenizerFactory;
    }

    public TokenFilterFactory[] getTokenFilters() {
        return tokenFilters;
    }

    public CharFilterFactory[] getCharFilters() {
        return charFilters;
    }

    public AnalysisMode analysisMode() {
        return this.analysisMode;
    }
}