/*
 * Copyright 2011 Greg Milette and Adam Stroud
 * 
 * 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 root.gast.speech;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.util.Log;

/**
 * receives the speech recognition language details from 
 * RecognizerIntent.ACTION_GET_LANGUAGE_DETAILS and 
 * then calls back to a {@link OnLanguageDetailsListener}
 * @author Greg Milette <<a href="mailto:gregorym@gmail.com">gregorym@gmail.com</a>>
 */
public class LanguageDetailsChecker extends BroadcastReceiver
{
    private static final String TAG = "LanguageDetailsChecker";

    private List<String> supportedLanguages;

    private String languagePreference;

    private OnLanguageDetailsListener doAfterReceive;

    public LanguageDetailsChecker(OnLanguageDetailsListener doAfterReceive)
    {
        supportedLanguages = new ArrayList<String>();
        this.doAfterReceive = doAfterReceive;
    }

    @Override
    public void onReceive(Context context, Intent intent)
    {
        Bundle results = getResultExtras(true);
        if (results.containsKey(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE))
        {
            languagePreference =
                    results.getString(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE);
        }
        if (results.containsKey(RecognizerIntent.EXTRA_SUPPORTED_LANGUAGES))
        {
            supportedLanguages =
                    results.getStringArrayList(
                            RecognizerIntent.EXTRA_SUPPORTED_LANGUAGES);
        }

        if (doAfterReceive != null)
        {
            doAfterReceive.onLanguageDetailsReceived(this);
        }
    }

    public String matchLanguage(Locale toCheck)
    {
        String matchedLanguage = null;
        // modify the returned languages to look like the output from
        // Locale.toString()
        String targetLanguage = toCheck.toString().replace('_', '-');
        for (String supportedLanguage : supportedLanguages)
        {
            // use contains, so that partial matches are possible
            // for example, if the Locale is
            // en-US-POSIX, it will still match en-US
            // and that if the target language is en, it will match something
            Log.d(TAG, targetLanguage + " contains " + supportedLanguage);
            if ((targetLanguage.contains(supportedLanguage))
                    || supportedLanguage.contains(targetLanguage))
            {
                matchedLanguage = supportedLanguage;
            }
        }
        return matchedLanguage;
    }

    /**
     * @return the supportedLanguages
     */
    public List<String> getSupportedLanguages()
    {
        return supportedLanguages;
    }

    /**
     * @return the languagePreference
     */
    public String getLanguagePreference()
    {
        return languagePreference;
    }

    public String toString()
    {
        StringBuilder sb = new StringBuilder();
        sb.append("Language Preference: ").append(getLanguagePreference())
                .append("\n");
        sb.append("languages supported: ").append("\n");
        for (String lang : getSupportedLanguages())
        {
            sb.append(" ").append(lang).append("\n");
        }
        return sb.toString();
    }
}