/**
 * QuizServiceSoapBindingImpl.java
 * 
 * This file was auto-generated from WSDL by the Apache Axis 1.2RC2 Nov 16, 2004
 * (12:19:44 EST) WSDL2Java emitter.
 */

package jomora.quiz;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.rmi.RemoteException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import jomora.io.DocumentUtil;

import org.apache.axis.MessageContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class QuizServiceSoapBindingImpl implements jomora.quiz.Quiz {

    /**
     * ログ出力
     */
    private static Log log = LogFactory.getLog(QuizServiceSoapBindingImpl.class);

    /**
     * 設問データファイルのあるディレクトリ
     */
    private File qmlDir;

    /**
     * 設問データ
     */
    private static List questionList;

    /**
     * コンストラクタ
     */
    public QuizServiceSoapBindingImpl() throws java.rmi.RemoteException {
        super();

        MessageContext context = MessageContext.getCurrentContext();
        qmlDir = new File((String)context.getProperty("qmlDir"));
        if (!qmlDir.exists()) {
            new RemoteException("qmlDirを正しく設定してください。");
        }

        if (questionList == null || questionList.isEmpty()) {
            this.loadQuestions();
        }
    }

    public int loadQuestions() throws java.rmi.RemoteException {

        //Quizデータの更新をlocalhostからのみとする。
        MessageContext context = MessageContext.getCurrentContext();
        HttpServletRequest req = (HttpServletRequest)context
                        .getProperty("transport.http.servletRequest");
        String addr = req.getRemoteAddr();
        if (!addr.startsWith("127.")) {
            log.info(addr + " からのこのメソッドの実行は許可されません。");
            return -1;
        }

        long startTime = System.currentTimeMillis();
        if (questionList == null) {
            questionList = new ArrayList();
        }

        synchronized (questionList) {
            questionList.clear();
            File[] qmlFiles = qmlDir.listFiles(new FilenameFilter() {
                public boolean accept(File dir, String name) {
                    if ("qml".equalsIgnoreCase(jomora.io.File.getExtension(name))) {
                        return true;
                    }
                    return false;
                }
            });

            XPath xpath = XPathFactory.newInstance().newXPath();

            // *.qmlファイルの読み込み
            int numOfQmlFiles = qmlFiles.length;
            for (int i = 0; i < numOfQmlFiles; i++) {
                File file = qmlFiles[i];
                //System.out.println(file.getName());
                try {
                    Document xmldoc = DocumentUtil.readDocument(file);

                    String title = (String)xpath.evaluate("/quiz/title",
                                    xmldoc, XPathConstants.STRING);
                    //selectNodeList(no.1)
                    NodeList questionNodeList = (NodeList)xpath.evaluate(
                                    "/quiz/group/question", xmldoc,
                                    XPathConstants.NODESET);
                    //selectNodeList(no.2)
                    //NodeList questionNodeList =
                    // XPathAPI.selectNodeList(xmldoc, "/quiz/group/question");

                    int numOfQuestionNodes = questionNodeList.getLength();
                    for (int j = 0; j < numOfQuestionNodes; j++) {
                        Node questionNode = questionNodeList.item(j);
                        Question question = new Question();
                        // <sentence>
                        String sentence = (String)xpath.evaluate("sentence",
                                        questionNode, XPathConstants.STRING);
                        question.setSentence(sentence);
                        // <choice>
                        NodeList choiceNodeList = (NodeList)xpath.evaluate("choice",
                                        questionNode, XPathConstants.NODESET);
                        int numOfChoiceNodes = choiceNodeList.getLength();
                        Choice[] choices = new Choice[numOfChoiceNodes];
                        for (int k = 0; k < numOfChoiceNodes; k++) {
                            Node choiceNode = choiceNodeList.item(k);
                            Choice choice = new Choice();
                            String text = choiceNode.getTextContent();
                            choice.setText(text);
                            boolean correct = Boolean.parseBoolean(
                                            (String)xpath.evaluate("@correct",
                                                            choiceNode, XPathConstants.STRING));
                            choice.setCorrect(correct);
                            choices[k] = choice;
                        }
                        question.setChoices(choices);
                        // <comment>
                        String comment = (String)xpath.evaluate("comment",
                                        questionNode, XPathConstants.STRING);
                        question.setComment(comment);
                        // <title>
                        question.setQuizTitle(title);
                        // <group>
                        String groupName = (String)xpath.evaluate("../@name",
                                        questionNode, XPathConstants.STRING);
                        question.setGroupName(groupName);

                        questionList.add(question);
                    }
                } catch (ParserConfigurationException e) {
                    log.error("XMLパーサの設定不備です。", e);
                    throw new RemoteException("XMLパーサの設定不備です。", e);
                } catch (XPathExpressionException e) {
                    log.error("XPath表現が間違っています。", e);
                    throw new RemoteException("XPath表現が間違っています。", e);
                } catch (SAXException e) {
                    log.error("", e);
                    throw new RemoteException("", e);
                } catch (IOException e) {
                    log.error("", e);
                    throw new RemoteException("", e);
                }

            }

        }
        log.info("QML LoadTime:" + (System.currentTimeMillis() - startTime)
                        + "[ms]");
        return questionList.size();
    }

    public jomora.quiz.Question getQuestion() throws java.rmi.RemoteException {
        int num = (int)(Math.random() * (questionList.size() + 1));

        Question question = (Question)questionList.get(num);

        Arrays.sort(question.getChoices(), new Comparator() {
            public int compare(Object o1, Object o2) {
                return ((int)(Math.random() * 3)) - 1;
            }
        });
        return question;
    }

}