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package org.hl7.fhir.utilities;

/*
  Copyright (c) 2011+, HL7, Inc.
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without modification, 
  are permitted provided that the following conditions are met:
    
   * Redistributions of source code must retain the above copyright notice, this 
     list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright notice, 
     this list of conditions and the following disclaimer in the documentation 
     and/or other materials provided with the distribution.
   * Neither the name of HL7 nor the names of its contributors may be used to 
     endorse or promote products derived from this software without specific 
     prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
  POSSIBILITY OF SUCH DAMAGE.
  
 */



import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.hl7.fhir.utilities.filesystem.ManagedFileAccess;
import org.hl7.fhir.utilities.xml.XMLUtil;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;

public class TranslatorXml implements TranslationServices {

  
  public class TranslatedTerm {
    private Set props = new HashSet();
    private Map translations = new HashMap();
  }


  private Map termsById = new HashMap();  
  private Map termsByTerm = new HashMap();  
  
  public TranslatorXml(String filename) throws ParserConfigurationException, SAXException, IOException {
    super();
    load(filename);
  }


  private void load(String filename) throws ParserConfigurationException, SAXException, IOException {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    factory.setNamespaceAware(false);
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document xml = builder.parse(ManagedFileAccess.file(filename)); 
    Element e = XMLUtil.getFirstChild(xml.getDocumentElement());
    while (e != null) {
      load(e);
      e = XMLUtil.getNextSibling(e);
    }
  }

  private void load(Element e) {
    TranslatedTerm t = new TranslatedTerm();
    for (int i = 0; i < e.getAttributes().getLength(); i++) {
      Node a = e.getAttributes().item(i);
      String n = a.getNodeName();
      if (n.equals("id"))
        termsById.put(a.getTextContent(), t);
      else if (a.getNodeValue().equals("true"))
        t.props.add(n);
    }
    Element c = XMLUtil.getFirstChild(e);
    while (c != null) {
      String l = c.getAttribute("lang");
      String s = c.getTextContent();
      if (l.equals("en"))
        termsByTerm.put(s, t);
      t.translations.put(l, s);
      c = XMLUtil.getNextSibling(c);
    }    
  }


  private Map getTranslations(String code) {
    TranslatedTerm t = termsById.get(code);
    if (t == null)
      t = termsByTerm.get(code);
    return t == null ? null : t.translations;
  }

  
  @Override
  public String translate(String context, String value, String targetLang) {
    if (targetLang == null)
      return value;
    Map t = getTranslations(value);
    if (t == null)
      return value;
    if (t.containsKey(targetLang))
      return t.get(targetLang);
    return value;
  }

  @Override
  public String translateAndFormat(String context, String lang, String value, Object... args) {
    value = translate(context, value, lang);
    return value == null ? "":  String.format(value, args);
  }

  @Override
  public String translate(String context, String value) {
    return null;    
  }

  @Override
  public String toStr(float value) {
    return null;
  }

  @Override
  public String toStr(Date value) {
    return null;
  }


  @Override
  public Map translations(String value) {
    return getTranslations(value);
  }


  @Override
  public Set listTranslations(String category) {
    Set res = new HashSet();
    for (String s : termsById.keySet()) {
      if (termsById.get(s).props.contains(category))
        res.add(s);
    }
    return res;
  }
 
}