package com.camilstaps.taize;

import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.util.Log;
import android.widget.Toast;

import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.camilstaps.common.Date;
import com.camilstaps.common.Listener;
import com.camilstaps.common.NullListener;
import com.camilstaps.rss.RetrieveFeedTask;
import com.camilstaps.rss.RssParser;

import org.json.JSONException;

import java.text.ParseException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Class specific to methods for Taize
 * @author Camil Staps
 */
public class Taize {

    private static final String url_reading_feed = "http://www.taize.fr/readingrss.php";
    private static final String url_reading_feed_en = "http://www.taize.fr/readingrss.php?lang=en";

    private static final int MAX_DIFFDATE_READING = 10;

    /**
     * Force fetching a new bible text for the daily reading
     * @see this#getDailyReadingBibleText
     * @param context
     * @param listener
     */
    public static void forceNewDailyReadingBibleText(final Context context, final Listener<String> listener) {
        SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(context).edit();
        editor.putLong("dailyreadingbiblefetch", 0);
        editor.putLong("englishdailyreadingfetch", 0);
        editor.commit();
        getDailyReadingBibleText(context, listener);
    }

    /**
     * Fetch the bible text corresponding to the daily reading
     * @see this#forceNewDailyReadingBibleText
     * @param context
     * @param listener
     */
    public static void getDailyReadingBibleText(final Context context, final Listener<String> listener) {
        if (System.currentTimeMillis() - PreferenceManager.getDefaultSharedPreferences(context).getLong("dailyreadingbiblefetch", 0) > 3600000) {

            getEnglishDailyReading(context, new Listener<String>() {
                @Override
                public void success(String reading) {

                    BibleText text = null;
                    text = new DailyReading(new Date(), reading).getBibleReference();
                    if (text == null) {
                        failure();
                        return;
                    }

                    text.getText(context, new Response.Listener<String>() {
                        @Override
                        public void onResponse(String s) {
                            PreferenceManager.getDefaultSharedPreferences(context).edit().putString("dailyreadingbible", s).apply();
                            listener.success(s);
                        }
                    }, new Response.ErrorListener() {
                        @Override
                        public void onErrorResponse(VolleyError volleyError) {
                            Log.e("NET", "Failed to fetch bible text.");
                        }
                    });

                }

                @Override
                public void failure() {
                    Toast.makeText(context, "Failed to fetch bible text.", Toast.LENGTH_SHORT).show();

                    listener.failure();
                }
            });

            PreferenceManager.getDefaultSharedPreferences(context).edit().putLong("dailyreadingbiblefetch", System.currentTimeMillis()).apply();

        } else {

            listener.success(PreferenceManager.getDefaultSharedPreferences(context).getString("dailyreadingbible", "No bible text found."));

        }
    }

    /**
     * Force fetching a new English daily reading
     * @see this#getEnglishDailyReading
     * @param context
     * @param listener
     */
    private static void forceNewEnglishDailyReading(final Context context, final Listener<String> listener) {
        PreferenceManager.getDefaultSharedPreferences(context).edit().putLong("englishdailyreadingfetch", 0).commit();
        getEnglishDailyReading(context, listener);
    }

    /**
     * Get the English daily reading (needed for the English Bible reference)
     * @see this#forceNewEnglishDailyReading
     * @param context
     * @param listener
     */
    private static void getEnglishDailyReading(final Context context, final Listener<String> listener) {
        if (System.currentTimeMillis() - PreferenceManager.getDefaultSharedPreferences(context).getLong("englishdailyreadingfetch", 0) > 3600000) {

            RetrieveFeedTask retrieve = new RetrieveFeedTask();
            retrieve.setRssDownloadListener(new Listener<RssParser>() {
                @Override
                public void success(RssParser parser) {
                    try {
                        String reading = parser.getItem(0).description.trim();

                        SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(context).edit();
                        editor.putString("englishdailyreading", reading);
                        editor.putLong("englishdailyreadingfetch", System.currentTimeMillis());
                        editor.apply();

                        listener.success(reading);
                    } catch (Exception e) {
                        failure();
                    }
                }

                @Override
                public void failure() {
                    listener.failure();
                }
            });

            try {
                retrieve.execute(url_reading_feed_en).get();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }

        } else {

            listener.success(PreferenceManager.getDefaultSharedPreferences(context).getString("englishdailyreading", "No daily reading found."));

        }
    }

    /**
     * Force fetching a new daily reading
     * @see this#getDailyReading
     * @param context
     * @param listener
     */
    public static void forceNewDailyReading(final Context context, final Listener<String> listener) {
        PreferenceManager.getDefaultSharedPreferences(context).edit().putLong("dailyreadingfetch", 0).commit();
        getDailyReading(context, listener);
    }

    /**
     * Fetch the daily reading
     * @see this#forceNewDailyReading
     * @param context
     * @param listener
     */
    public static void getDailyReading(final Context context, final Listener<String> listener) {
        if (System.currentTimeMillis() - PreferenceManager.getDefaultSharedPreferences(context).getLong("dailyreadingfetch", 0) > 3600000) {

            RetrieveFeedTask retrieve = new RetrieveFeedTask();
            retrieve.setRssDownloadListener(new Listener<RssParser>() {
                @Override
                public void success(RssParser parser) {
                    try {
                        String reading = parser.getItem(0).description.trim();

                        if (!reading.equals(PreferenceManager.getDefaultSharedPreferences(context).getString("dailyreading", ""))) {
                            forceNewDailyReadingBibleText(context, new NullListener<String>());
                        }

                        SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(context).edit();
                        editor.putString("dailyreading", reading);
                        editor.putLong("dailyreadingfetch", System.currentTimeMillis());
                        editor.apply();

                        listener.success(reading);
                    } catch (Exception e) {
                        failure();
                    }
                }

                @Override
                public void failure() {
                    Toast.makeText(context, "Failed to fetch daily reading.", Toast.LENGTH_SHORT).show();

                    listener.failure();
                }
            });

            try {
                retrieve.execute(url_reading_feed + "?lang=" + PreferenceManager.getDefaultSharedPreferences(context).getString(SettingsActivity.SettingsFragment.PREF_LANGUAGE_READINGS, "en")).get();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }

        } else {

            listener.success(PreferenceManager.getDefaultSharedPreferences(context).getString("dailyreading", "No daily reading found."));

        }
    }

    public static void getDailyReading(final Context context, final Listener<DailyReading> listener, Date date) {

        Set<DailyReading> dailyReadings = getDailyReadingsSet(context);

        for (DailyReading reading : dailyReadings) {
            if (reading.getDate().equals(date)) {
                listener.success(reading);
                return;
            }
        }

        fetchDailyReading(context, listener, date);

    }

    private static void fetchDailyReading(final Context context, final Listener<DailyReading> listener, final Date date) {

        RetrieveFeedTask retrieve = new RetrieveFeedTask();
        retrieve.setRssDownloadListener(new Listener<RssParser>() {
            @Override
            public void success(RssParser parser) {
                try {
                    String text = parser.getItem(0).description.trim();
                    DailyReading reading = new DailyReading(date, text);

                    Set<DailyReading> dailyReadings = getDailyReadingsSet(context);
                    dailyReadings.add(reading);
                    putDailyReadingsSet(context, dailyReadings);

                    listener.success(reading);
                } catch (Exception e) {
                    failure();
                }
            }

            @Override
            public void failure() {
                Toast.makeText(context, "Failed to fetch daily reading.", Toast.LENGTH_SHORT).show();

                listener.failure();
            }
        });
        try {
            retrieve.execute(url_reading_feed
                    + "?lang=" + PreferenceManager.getDefaultSharedPreferences(context).getString(SettingsActivity.SettingsFragment.PREF_LANGUAGE_READINGS, "en")
                    + "&date=" + date.toString()
            ).get();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }

    }

    public static Set<DailyReading> getDailyReadingsSet(Context context) {
        Set<DailyReading> dailyReadings= new HashSet<DailyReading>();
        for (String s : PreferenceManager.getDefaultSharedPreferences(context).getStringSet("dailyreadings", new HashSet<String>())) {
            try {
                dailyReadings.add(DailyReading.fromString(s));
            } catch (JSONException e) {
                e.printStackTrace();
            } catch (ParseException e) {
                e.printStackTrace();
            }
        }
        return dailyReadings;
    }

    private static void putDailyReadingsSet(Context context, Set<DailyReading> set) {
        SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(context).edit();
        Set<String> putSet = new HashSet<>();
        for (DailyReading reading : set) {
            putSet.add(reading.toString());
        }
        editor.putStringSet("dailyreadings", putSet);
        editor.apply();
    }

    public static void clearDailyReadingsSet(Context context) {
        putDailyReadingsSet(context, new HashSet<DailyReading>());
    }

    public static void cleanDailyReadingsSet(Context context) {
        Set<DailyReading> set = getDailyReadingsSet(context);
        Iterator<DailyReading> iterator = set.iterator();
        while (iterator.hasNext()) {
            DailyReading reading = iterator.next();
            if (reading.getDate().diffDays(new Date()) > MAX_DIFFDATE_READING) {
                // Remove too old / too new
                iterator.remove();
            } else {
                // Remove duplicates
                for (DailyReading r : set) {
                    if (r.getDate().equals(reading.getDate())) {
                        iterator.remove();
                        break;
                    }
                }
            }
        }
        putDailyReadingsSet(context, set);
    }

    //http://www.taize.fr/pdcrss.xml

}