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/*
 * Copyright 2018 mayabot.com authors. 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.mayabot.nlp.pinyin;

import com.google.common.primitives.Ints;
import com.mayabot.nlp.collection.ahocorasick.AhoCoraickDoubleArrayTrieBuilder;
import com.mayabot.nlp.collection.ahocorasick.AhoCorasickDoubleArrayTrie;
import com.mayabot.nlp.logging.InternalLogger;
import com.mayabot.nlp.logging.InternalLoggerFactory;
import com.mayabot.nlp.pinyin.model.Pinyin;

import java.io.DataInput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.TreeMap;

/**
 * 拼音的词典
 *
 * @author jimichan
 */
public abstract class BasePinyinDictionary {

    InternalLogger logger = InternalLoggerFactory.getInstance(BasePinyinDictionary.class);

    private AhoCorasickDoubleArrayTrie trie = null;

    private CustomPinyin customPinyin = new CustomPinyin();

    private TreeMap system;

    public BasePinyinDictionary() {
    }

    public void rebuild() {

        long t1 = System.currentTimeMillis();
        if (system == null) {
            system = load();
        }
        TreeMap map = new TreeMap<>();
        if (customPinyin != null && !customPinyin.getMap().isEmpty()) {
            map.putAll(system);

            final TreeMap map2 = map;
            customPinyin.getMap().forEach((key, value) -> {
                map2.put(key, parse(value));
            });
        } else {
            map = system;
        }
        AhoCoraickDoubleArrayTrieBuilder builder = new AhoCoraickDoubleArrayTrieBuilder<>();
        this.trie = builder.build(map);
        long t2 = System.currentTimeMillis();

        logger.info("Pinyin Dictionary rebuild use time {} ms", t2 - t1);
    }

    abstract TreeMap load();

    /**
     * 转化为拼音
     *
     * @param text 文本
     */
    public PinyinResult text2Pinyin(String text) {
        return new PinyinResult(segLongest(text.toCharArray()), text);
    }

    /**
     * 来自Hanlp的拼音方法
     *
     * @param charArray
     * @return List
     */
    private List segLongest(char[] charArray) {
        final Pinyin[][] wordNet = new Pinyin[charArray.length][];

        trie.parseText(charArray, (begin, end, value) -> {
            int length = end - begin;
            if (wordNet[begin] == null || length > wordNet[begin].length) {
                wordNet[begin] = length == 1 ? new Pinyin[]{value[0]} : value;
            }
        });
        List pinyinList = new ArrayList<>(charArray.length);
        for (int offset = 0; offset < wordNet.length; ) {
            if (wordNet[offset] == null) {
                pinyinList.add(Pinyin.none5);
                ++offset;
                continue;
            }
            Collections.addAll(pinyinList, wordNet[offset]);

            offset += wordNet[offset].length;
        }
        return pinyinList;
    }


    static Pinyin[] pinyinByOrdinal;

    static {
        pinyinByOrdinal = new Pinyin[Pinyin.values().length + 1];

        Pinyin[] values = Pinyin.values();
        for (int i = values.length - 1; i >= 0; i--) {
            pinyinByOrdinal[values[i].ordinal()] = values[i];
        }
    }

    public static Pinyin[] read(DataInput in) {
        try {
            String line = in.readUTF();
            String[] split = line.split(",");

            Pinyin[] pinyins = new Pinyin[split.length];

            for (int i = 0; i < split.length; i++) {
                Integer xx = Ints.tryParse(split[i]);
                Pinyin pinyin = pinyinByOrdinal[xx];
                pinyins[i] = pinyin;
            }

            return pinyins;

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }

    Pinyin[] parse(String text) {
        String[] values = text.split(",");


        Pinyin[] pinyins = new Pinyin[values.length];
        boolean error = false;
        for (int i = 0; i < values.length; i++) {
            try {
                Pinyin pinyin = Pinyin.valueOf(values[i]);
                pinyins[i] = pinyin;

            } catch (IllegalArgumentException e) {
                logger.warn("读取拼音词典，解析" + text + "错误");
                error = true;
            }
        }
        if (!error) {
            return pinyins;
        } else {
            return null;
        }
    }

    public CustomPinyin getCustomPinyin() {
        return customPinyin;
    }

}