package de.mpg.mpiwg.berlin.mpdl.cms.translator;

import java.util.ArrayList;

import com.memetix.mst.language.Language;
import com.memetix.mst.translate.Translate;
import com.memetix.mst.detect.Detect;

import de.mpg.mpiwg.berlin.mpdl.exception.ApplicationException;

public class MicrosoftTranslator {
  private static final String KEY = "474A4E72DB217E37031EC190ACB4159378A6917C";  // free key to use with Microsoft server
  private static String[] DEST_LANGUAGES = {"eng", "ger", "fra"};

  private MicrosoftTranslator() {
    // nothing: prevent instantiation
  }
  
  public static String[] getDestLanguages() {
    return DEST_LANGUAGES;
  }

  public static String translate(String query, String toLanguageStr) throws ApplicationException {
    if (toLanguageStr == null)
      throw new ApplicationException("MicrosoftTranslator: toLanguageStr is null");
    String translation = null;
    try {
      Translate.setKey(KEY);  // Set the API key once per JVM. It is set statically and applies to all services
      String langId = de.mpg.mpiwg.berlin.mpdl.lt.general.Language.getInstance().getLanguageId(toLanguageStr);  // e.g. "de" is delivered from "deu"
      Language toLanguage = Language.fromString(langId);
      translation = Translate.execute(query, toLanguage);
      translation = translation.toLowerCase();
    } catch (Exception e) {
      throw new ApplicationException(e);
    }
    return translation;
  }

  public static String translate(String query, String fromLanguageStr, String toLanguageStr) throws ApplicationException {
    if (fromLanguageStr == null)
      throw new ApplicationException("MicrosoftTranslator: toLanguageStr is null");
    if (toLanguageStr == null)
      throw new ApplicationException("MicrosoftTranslator: fromLanguageStr is null");
    String translation = null;
    try {
      Translate.setKey(KEY);
      String fromLangId = de.mpg.mpiwg.berlin.mpdl.lt.general.Language.getInstance().getLanguageId(fromLanguageStr);  // e.g. "de" is delivered from "deu"
      String toLangId = de.mpg.mpiwg.berlin.mpdl.lt.general.Language.getInstance().getLanguageId(toLanguageStr);  // e.g. "de" is delivered from "deu"
      Language fromLanguage = Language.fromString(fromLangId);
      Language toLanguage = Language.fromString(toLangId);
      translation = Translate.execute(query, fromLanguage, toLanguage);
      translation = translation.toLowerCase();
    } catch (Exception e) {
      throw new ApplicationException(e);
    }
    return translation;
  }

  public static ArrayList<String> translate(String[] query, String fromLanguageStr, String[] toLanguagesStr) throws ApplicationException {
    ArrayList<String> translations = new ArrayList<String>();
    for (int i=0; i<toLanguagesStr.length; i++) {
      String toLanguageStr = toLanguagesStr[i];
      String[] translationsArray = translate(query, fromLanguageStr, toLanguageStr);
      for (int j=0; j<translationsArray.length; j++) {
        String translation = translationsArray[j];
        translations.add(translation);
      }
    }
    return translations;
  }
  
  public static String[] translate(String[] query, String fromLanguageStr, String toLanguageStr) throws ApplicationException {
    if (fromLanguageStr == null)
      throw new ApplicationException("MicrosoftTranslator: toLanguageStr is null");
    if (toLanguageStr == null)
      throw new ApplicationException("MicrosoftTranslator: fromLanguageStr is null");
    String[] translation = null;
    try {
      Translate.setKey(KEY);  
      String fromLangId = de.mpg.mpiwg.berlin.mpdl.lt.general.Language.getInstance().getLanguageId(fromLanguageStr);  // e.g. "de" is delivered from "deu"
      String toLangId = de.mpg.mpiwg.berlin.mpdl.lt.general.Language.getInstance().getLanguageId(toLanguageStr);  // e.g. "de" is delivered from "deu"
      Language fromLanguage = Language.fromString(fromLangId);
      Language toLanguage = Language.fromString(toLangId);
      translation = Translate.execute(query, fromLanguage, toLanguage);
      for (int i=0; i<translation.length; i++) {
        translation[i] = translation[i].toLowerCase();
      }
    } catch (Exception e) {
      throw new ApplicationException(e);
    }
    return translation;
  }

  public static String detectLanguageCode(String query) throws ApplicationException {
    String langCode = null;
    try {
      Detect.setKey(KEY);
      Language detectedLanguage = Detect.execute(query);
      if (detectedLanguage != null)
        langCode = detectedLanguage.toString();
    } catch (Exception e) {
      throw new ApplicationException(e);
    }
    return langCode;
  }
   
  public static String detectLanguageName(String query) throws ApplicationException {
    String langName = null;
    try {
      Detect.setKey(KEY);
      Language detectedLanguage = Detect.execute(query);
      if (detectedLanguage != null)
        langName = detectedLanguage.getName(Language.GERMAN);
    } catch (Exception e) {
      throw new ApplicationException(e);
    }
    return langName;
  }

}