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/*
 * Copyright 2014-2019 the original author or authors.
 *
 * 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.deepoove.poi.resolver;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.xml.namespace.QName;

import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;
import org.apache.xmlbeans.QNameSet;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTBr;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTEmpty;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTR;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTText;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.impl.CTRImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.deepoove.poi.util.StyleUtils;

public class RunningRunParagraph {

    private static final Logger LOGGER = LoggerFactory.getLogger(RunningRunParagraph.class);

    static QNameSet qname = QNameSet.forArray(new QName[] {
            new QName("http://schemas.openxmlformats.org/wordprocessingml/2006/main", "br"),
            new QName("http://schemas.openxmlformats.org/wordprocessingml/2006/main", "t"),
            new QName("http://schemas.openxmlformats.org/wordprocessingml/2006/main", "cr") });

    private XWPFParagraph paragraph;
    private List runs;

    List> pairs = new ArrayList>();

    public RunningRunParagraph(XWPFParagraph paragraph, Pattern pattern) {
        this.paragraph = paragraph;
        this.runs = paragraph.getRuns();
        if (null == runs || runs.isEmpty()) return;

        Matcher matcher = pattern.matcher(paragraph.getText());
        if (matcher.find()) {
            refactorParagraph();
        }

        buildRunEdge(pattern);
    }

    public List refactorRun() {
        if (pairs.isEmpty()) return null;
        List templateRuns = new ArrayList();
        int size = pairs.size();
        Pair runEdgePair;
        for (int n = size - 1; n >= 0; n--) {
            runEdgePair = pairs.get(n);
            RunEdge startEdge = runEdgePair.getLeft();
            RunEdge endEdge = runEdgePair.getRight();
            int startRunPos = startEdge.getRunPos();
            int endRunPos = endEdge.getRunPos();
            int startOffset = startEdge.getRunEdge();
            int endOffset = endEdge.getRunEdge();

            // String startText = runs.get(startRunPos).getText(0);
            // String endText = runs.get(endRunPos).getText(0);
            String startText = runs.get(startRunPos).text();
            String endText = runs.get(endRunPos).text();
            if (endOffset + 1 >= endText.length()) {
                // end run 无需split，若不是start run，直接remove
                if (startRunPos != endRunPos) paragraph.removeRun(endRunPos);
            } else {
                // split end run, set extra in a run
                String extra = endText.substring(endOffset + 1, endText.length());
                if (startRunPos == endRunPos) {
                    XWPFRun extraRun = paragraph.insertNewRun(endRunPos + 1);
                    StyleUtils.styleRun(extraRun, runs.get(endRunPos));
                    buildExtra(extra, extraRun);
                } else {
                    XWPFRun extraRun = runs.get(endRunPos);
                    buildExtra(extra, extraRun);
                }
            }

            // remove extra run
            for (int m = endRunPos - 1; m > startRunPos; m--) {
                paragraph.removeRun(m);
            }

            if (startOffset <= 0) {
                // start run 无需split
                XWPFRun templateRun = runs.get(startRunPos);
                templateRun.setText(startEdge.getTag(), 0);
                templateRuns.add(runs.get(startRunPos));
            } else {
                // split start run, set extra in a run
                String extra = startText.substring(0, startOffset);
                XWPFRun extraRun = runs.get(startRunPos);
                buildExtra(extra, extraRun);// TODO

                XWPFRun templateRun = paragraph.insertNewRun(startRunPos + 1);
                StyleUtils.styleRun(templateRun, extraRun);
                templateRun.setText(startEdge.getTag(), 0);
                templateRuns.add(runs.get(startRunPos + 1));
            }

        }
        return templateRuns;
    }

    private void buildExtra(String extra, XWPFRun extraRun) {
        extraRun.setText(extra, 0);
    }

    private void refactorParagraph() {
        for (int i = runs.size() - 1; i >= 0; i--) {
            XWPFRun xwpfRun = runs.get(i);
            CTR ctr = xwpfRun.getCTR();
            CTRImpl ctrimpl = (CTRImpl) ctr;
            int sizeOfBrArray = ctr.sizeOfBrArray();
            int sizeOfCrArray = ctr.sizeOfCrArray();
            if ((sizeOfBrArray + sizeOfCrArray) > 0) {
                synchronized (ctrimpl.monitor()) {
                    // ctrimpl.check_orphaned();
                    ArrayList