package com.android.deskclock.stopwatch;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.preference.PreferenceManager;
import android.text.format.DateUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListPopupWindow;
import android.widget.ListView;
import android.widget.PopupWindow.OnDismissListener;
import android.widget.TextView;

import com.android.deskclock.CircleButtonsLinearLayout;
import com.android.deskclock.CircleTimerView;
import com.android.deskclock.DeskClock;
import com.android.deskclock.DeskClockFragment;
import com.android.deskclock.Log;
import com.android.deskclock.R;
import com.android.deskclock.Utils;
import com.android.deskclock.timer.CountingTimerView;

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

public class StopwatchFragment extends DeskClockFragment
        implements OnSharedPreferenceChangeListener {

    private static final String TAG = "StopwatchFragment";
    int mState = Stopwatches.STOPWATCH_RESET;

    // Stopwatch views that are accessed by the activity
    private ImageButton mLeftButton;
    private TextView mCenterButton;
    private CircleTimerView mTime;
    private CountingTimerView mTimeText;
    private ListView mLapsList;
    private ImageButton mShareButton;
    private ListPopupWindow mSharePopup;
    private WakeLock mWakeLock;

    // Used for calculating the time from the start taking into account the pause times
    long mStartTime = 0;
    long mAccumulatedTime = 0;

    // Lap information
    class Lap {
        Lap () {
            mLapTime = 0;
            mTotalTime = 0;
        }

        Lap (long time, long total) {
            mLapTime = time;
            mTotalTime = total;
        }
        public long mLapTime;
        public long mTotalTime;
    }

    // Adapter for the ListView that shows the lap times.
    class LapsListAdapter extends BaseAdapter {

        ArrayList<Lap> mLaps = new ArrayList<Lap>();
        private final LayoutInflater mInflater;
        private final int mBackgroundColor;
        private final String[] mFormats;
        private final String[] mLapFormatSet;
        // Size of this array must match the size of formats
        private final long[] mThresholds = {
                10 * DateUtils.MINUTE_IN_MILLIS, // < 10 minutes
                DateUtils.HOUR_IN_MILLIS, // < 1 hour
                10 * DateUtils.HOUR_IN_MILLIS, // < 10 hours
                100 * DateUtils.HOUR_IN_MILLIS, // < 100 hours
                1000 * DateUtils.HOUR_IN_MILLIS // < 1000 hours
        };
        private int mLapIndex = 0;
        private int mTotalIndex = 0;
        private String mLapFormat;

        public LapsListAdapter(Context context) {
            mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            mBackgroundColor = getResources().getColor(R.color.blackish);
            mFormats = context.getResources().getStringArray(R.array.stopwatch_format_set);
            mLapFormatSet = context.getResources().getStringArray(R.array.sw_lap_number_set);
            updateLapFormat();
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (mLaps.size() == 0 || position >= mLaps.size()) {
                return null;
            }
            View lapInfo;
            if (convertView != null) {
                lapInfo = convertView;
            } else {
                lapInfo =  mInflater.inflate(R.layout.lap_view, parent, false);
            }
            TextView count = (TextView)lapInfo.findViewById(R.id.lap_number);
            TextView lapTime = (TextView)lapInfo.findViewById(R.id.lap_time);
            TextView toalTime = (TextView)lapInfo.findViewById(R.id.lap_total);
            lapTime.setText(Stopwatches.formatTimeText(mLaps.get(position).mLapTime,
                    mFormats[mLapIndex]));
            toalTime.setText(Stopwatches.formatTimeText(mLaps.get(position).mTotalTime,
                    mFormats[mTotalIndex]));
            count.setText(String.format(mLapFormat, mLaps.size() - position).toUpperCase());

            lapInfo.setBackgroundColor(mBackgroundColor);
            return lapInfo;
        }

        @Override
        public int getCount() {
            return mLaps.size();
        }

        @Override
        public Object getItem(int position) {
            if (mLaps.size() == 0 || position >= mLaps.size()) {
                return null;
            }
            return mLaps.get(position);
        }

        private void updateLapFormat() {
            // Note Stopwatches.MAX_LAPS < 100
            mLapFormat = mLapFormatSet[mLaps.size() < 10 ? 0 : 1];
        }

        private void resetTimeFormats() {
            mLapIndex = mTotalIndex = 0;
        }

        public boolean updateTimeFormats(Lap lap) {
            boolean formatChanged = false;
            while (mLapIndex + 1 < mThresholds.length && lap.mLapTime >= mThresholds[mLapIndex]) {
                mLapIndex++;
                formatChanged = true;
            }
            while (mTotalIndex + 1 < mThresholds.length && 
                lap.mTotalTime >= mThresholds[mTotalIndex]) {
                mTotalIndex++;
                formatChanged = true;
            }
            return formatChanged;
        }

        public void addLap(Lap l) {
            mLaps.add(0, l);
            // for efficiency caller also calls notifyDataSetChanged()
        }

        public void clearLaps() {
            mLaps.clear();
            updateLapFormat();
            resetTimeFormats();
            notifyDataSetChanged();
        }

        // Helper function used to get the lap data to be stored in the activitys's bundle
        public long [] getLapTimes() {
            int size = mLaps.size();
            if (size == 0) {
                return null;
            }
            long [] laps = new long[size];
            for (int i = 0; i < size; i ++) {
                laps[i] = mLaps.get(i).mTotalTime;
            }
            return laps;
        }

        // Helper function to restore adapter's data from the activity's bundle
        public void setLapTimes(long [] laps) {
            if (laps == null || laps.length == 0) {
                return;
            }

            int size = laps.length;
            mLaps.clear();
            for (int i = 0; i < size; i ++) {
                mLaps.add(new Lap (laps[i], 0));
            }
            long totalTime = 0;
            for (int i = size -1; i >= 0; i --) {
                totalTime += laps[i];
                mLaps.get(i).mTotalTime = totalTime;
                updateTimeFormats(mLaps.get(i));
            }
            updateLapFormat();
            notifyDataSetChanged();
        }
    }

    // Keys for data stored in the activity's bundle
    private static final String START_TIME_KEY = "start_time";
    private static final String ACCUM_TIME_KEY = "accum_time";
    private static final String STATE_KEY = "state";
    private static final String LAPS_KEY = "laps";

    LapsListAdapter mLapsAdapter;

    public StopwatchFragment() {
    }

    private void rightButtonAction() {
        long time = Utils.getTimeNow();
        Context context = getActivity().getApplicationContext();
        Intent intent = new Intent(context, StopwatchService.class);
        intent.putExtra(Stopwatches.MESSAGE_TIME, time);
        intent.putExtra(Stopwatches.SHOW_NOTIF, false);
        switch (mState) {
            case Stopwatches.STOPWATCH_RUNNING:
                // do stop
                long curTime = Utils.getTimeNow();
                mAccumulatedTime += (curTime - mStartTime);
                doStop();
                intent.setAction(Stopwatches.STOP_STOPWATCH);
                context.startService(intent);
                releaseWakeLock();
                break;
            case Stopwatches.STOPWATCH_RESET:
            case Stopwatches.STOPWATCH_STOPPED:
                // do start
                doStart(time);
                intent.setAction(Stopwatches.START_STOPWATCH);
                context.startService(intent);
                acquireWakeLock();
                break;
            default:
                Log.wtf("Illegal state " + mState
                        + " while pressing the right stopwatch button");
                break;
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.stopwatch_fragment, container, false);

        mLeftButton = (ImageButton)v.findViewById(R.id.stopwatch_left_button);
        mLeftButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                long time = Utils.getTimeNow();
                Context context = getActivity().getApplicationContext();
                Intent intent = new Intent(context, StopwatchService.class);
                intent.putExtra(Stopwatches.MESSAGE_TIME, time);
                intent.putExtra(Stopwatches.SHOW_NOTIF, false);
                switch (mState) {
                    case Stopwatches.STOPWATCH_RUNNING:
                        // Save lap time
                        addLapTime(time);
                        doLap();
                        intent.setAction(Stopwatches.LAP_STOPWATCH);
                        context.startService(intent);
                        break;
                    case Stopwatches.STOPWATCH_STOPPED:
                        // do reset
                        doReset();
                        intent.setAction(Stopwatches.RESET_STOPWATCH);
                        context.startService(intent);
                        releaseWakeLock();
                        break;
                    default:
                        Log.wtf("Illegal state " + mState
                                + " while pressing the left stopwatch button");
                        break;
                }
            }
        });


        mCenterButton = (TextView)v.findViewById(R.id.stopwatch_stop);
        mShareButton = (ImageButton)v.findViewById(R.id.stopwatch_share_button);

        mShareButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showSharePopup();
            }
        });

        // Timer text serves as a virtual start/stop button.
        final CountingTimerView countingTimerView = (CountingTimerView)
                v.findViewById(R.id.stopwatch_time_text);
        countingTimerView.registerVirtualButtonAction(new Runnable() {
            @Override
            public void run() {
                rightButtonAction();
            }
        });
        countingTimerView.registerStopTextView(mCenterButton);
        countingTimerView.setVirtualButtonEnabled(true);

        mTime = (CircleTimerView)v.findViewById(R.id.stopwatch_time);
        mTimeText = (CountingTimerView)v.findViewById(R.id.stopwatch_time_text);
        mLapsList = (ListView)v.findViewById(R.id.laps_list);
        mLapsList.setDividerHeight(0);
        mLapsAdapter = new LapsListAdapter(getActivity());
        if (mLapsList != null) {
            mLapsList.setAdapter(mLapsAdapter);
        }

        CircleButtonsLinearLayout circleLayout =
                (CircleButtonsLinearLayout)v.findViewById(R.id.stopwatch_circle);
        circleLayout.setCircleTimerViewIds(R.id.stopwatch_time, R.id.stopwatch_left_button,
                R.id.stopwatch_share_button, R.id.stopwatch_stop,
                R.dimen.plusone_reset_button_padding, R.dimen.share_button_padding,
                0, 0); /** No label for a stopwatch**/

        return v;
    }

    @Override
    public void onResume() {
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        prefs.registerOnSharedPreferenceChangeListener(this);
        readFromSharedPref(prefs);
        mTime.readFromSharedPref(prefs, "sw");
        mTime.postInvalidate();

        setButtons(mState);
        mTimeText.setTime(mAccumulatedTime, true, true);
        if (mState == Stopwatches.STOPWATCH_RUNNING) {
            acquireWakeLock();
            startUpdateThread();
        } else if (mState == Stopwatches.STOPWATCH_STOPPED && mAccumulatedTime != 0) {
            mTimeText.blinkTimeStr(true);
        }
        showLaps();
        ((DeskClock)getActivity()).registerPageChangedListener(this);
        // View was hidden in onPause, make sure it is visible now.
        View v = getView();
        if (v != null) {
            getView().setVisibility(View.VISIBLE);
        }
        super.onResume();
    }

    @Override
    public void onPause() {
        // This is called because the lock screen was activated, the window stay
        // active under it and when we unlock the screen, we see the old time for
        // a fraction of a second.
        View v = getView();
        if (v != null) {
            getView().setVisibility(View.INVISIBLE);
        }

        if (mState == Stopwatches.STOPWATCH_RUNNING) {
            stopUpdateThread();
        }
        // The stopwatch must keep running even if the user closes the app so save stopwatch state
        // in shared prefs
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        prefs.unregisterOnSharedPreferenceChangeListener(this);
        writeToSharedPref(prefs);
        mTime.writeToSharedPref(prefs, "sw");
        mTimeText.blinkTimeStr(false);
        if (mSharePopup != null) {
            mSharePopup.dismiss();
            mSharePopup = null;
        }
        ((DeskClock)getActivity()).unregisterPageChangedListener(this);
        releaseWakeLock();
        super.onPause();
    }

    @Override
    public void onPageChanged(int page) {
        if (page == DeskClock.STOPWATCH_TAB_INDEX && mState == Stopwatches.STOPWATCH_RUNNING) {
            acquireWakeLock();
        } else {
            releaseWakeLock();
        }
    }

    private void doStop() {
        stopUpdateThread();
        mTime.pauseIntervalAnimation();
        mTimeText.setTime(mAccumulatedTime, true, true);
        mTimeText.blinkTimeStr(true);
        updateCurrentLap(mAccumulatedTime);
        setButtons(Stopwatches.STOPWATCH_STOPPED);
        mState = Stopwatches.STOPWATCH_STOPPED;
    }

    private void doStart(long time) {
        mStartTime = time;
        startUpdateThread();
        mTimeText.blinkTimeStr(false);
        if (mTime.isAnimating()) {
            mTime.startIntervalAnimation();
        }
        setButtons(Stopwatches.STOPWATCH_RUNNING);
        mState = Stopwatches.STOPWATCH_RUNNING;
    }

    private void doLap() {
        showLaps();
        setButtons(Stopwatches.STOPWATCH_RUNNING);
    }

    private void doReset() {
        SharedPreferences prefs =
                PreferenceManager.getDefaultSharedPreferences(getActivity());
        Utils.clearSwSharedPref(prefs);
        mTime.clearSharedPref(prefs, "sw");
        mAccumulatedTime = 0;
        mLapsAdapter.clearLaps();
        showLaps();
        mTime.stopIntervalAnimation();
        mTime.reset();
        mTimeText.setTime(mAccumulatedTime, true, true);
        mTimeText.blinkTimeStr(false);
        setButtons(Stopwatches.STOPWATCH_RESET);
        mState = Stopwatches.STOPWATCH_RESET;
    }

    private void showShareButton(boolean show) {
        if (mShareButton != null) {
            mShareButton.setVisibility(show ? View.VISIBLE : View.INVISIBLE);
            mShareButton.setEnabled(show);
        }
    }

    private void showSharePopup() {
        Intent intent = getShareIntent();

        Activity parent = getActivity();
        PackageManager packageManager = parent.getPackageManager();

        // Get a list of sharable options.
        List<ResolveInfo> shareOptions = packageManager
                .queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);

        if (shareOptions.size() == 0) {
            return;
        }
        ArrayList<CharSequence> shareOptionTitles = new ArrayList<CharSequence>();
        ArrayList<Drawable> shareOptionIcons = new ArrayList<Drawable>();
        ArrayList<CharSequence> shareOptionThreeTitles = new ArrayList<CharSequence>();
        ArrayList<Drawable> shareOptionThreeIcons = new ArrayList<Drawable>();
        ArrayList<String> shareOptionPackageNames = new ArrayList<String>();
        ArrayList<String> shareOptionClassNames = new ArrayList<String>();

        for (int option_i = 0; option_i < shareOptions.size(); option_i++) {
            ResolveInfo option = shareOptions.get(option_i);
            CharSequence label = option.loadLabel(packageManager);
            Drawable icon = option.loadIcon(packageManager);
            shareOptionTitles.add(label);
            shareOptionIcons.add(icon);
            if (shareOptions.size() > 4 && option_i < 3) {
                shareOptionThreeTitles.add(label);
                shareOptionThreeIcons.add(icon);
            }
            shareOptionPackageNames.add(option.activityInfo.packageName);
            shareOptionClassNames.add(option.activityInfo.name);
        }
        if (shareOptionTitles.size() > 4) {
            shareOptionThreeTitles.add(getResources().getString(R.string.see_all));
            shareOptionThreeIcons.add(getResources().getDrawable(android.R.color.transparent));
        }

        if (mSharePopup != null) {
            mSharePopup.dismiss();
            mSharePopup = null;
        }
        mSharePopup = new ListPopupWindow(parent);
        mSharePopup.setAnchorView(mShareButton);
        mSharePopup.setModal(true);
        // This adapter to show the rest will be used to quickly repopulate if "See all..." is hit.
        ImageLabelAdapter showAllAdapter = new ImageLabelAdapter(parent,
                R.layout.popup_window_item, shareOptionTitles, shareOptionIcons,
                shareOptionPackageNames, shareOptionClassNames);
        if (shareOptionTitles.size() > 4) {
            mSharePopup.setAdapter(new ImageLabelAdapter(parent, R.layout.popup_window_item,
                    shareOptionThreeTitles, shareOptionThreeIcons, shareOptionPackageNames,
                    shareOptionClassNames, showAllAdapter));
        } else {
            mSharePopup.setAdapter(showAllAdapter);
        }

        mSharePopup.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                CharSequence label = ((TextView) view.findViewById(R.id.title)).getText();
                if (label.equals(getResources().getString(R.string.see_all))) {
                    mSharePopup.setAdapter(
                            ((ImageLabelAdapter) parent.getAdapter()).getShowAllAdapter());
                    mSharePopup.show();
                    return;
                }

                Intent intent = getShareIntent();
                ImageLabelAdapter adapter = (ImageLabelAdapter) parent.getAdapter();
                String packageName = adapter.getPackageName(position);
                String className = adapter.getClassName(position);
                intent.setClassName(packageName, className);
                startActivity(intent);
            }
        });
        mSharePopup.setOnDismissListener(new OnDismissListener() {
            @Override
            public void onDismiss() {
                mSharePopup = null;
            }
        });
        mSharePopup.setWidth((int) getResources().getDimension(R.dimen.popup_window_width));
        mSharePopup.show();
    }

    private Intent getShareIntent() {
        Intent intent = new Intent(android.content.Intent.ACTION_SEND);
        intent.setType("text/plain");
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
        intent.putExtra(Intent.EXTRA_SUBJECT,
                Stopwatches.getShareTitle(getActivity().getApplicationContext()));
        intent.putExtra(Intent.EXTRA_TEXT, Stopwatches.buildShareResults(
                getActivity().getApplicationContext(), mTimeText.getTimeString(),
                getLapShareTimes(mLapsAdapter.getLapTimes())));
        return intent;
    }

    /** Turn laps as they would be saved in prefs into format for sharing. **/
    private long[] getLapShareTimes(long[] input) {
        if (input == null) {
            return null;
        }

        int numLaps = input.length;
        long[] output = new long[numLaps];
        long prevLapElapsedTime = 0;
        for (int lap_i = numLaps - 1; lap_i >= 0; lap_i--) {
            long lap = input[lap_i];
            Log.v("lap "+lap_i+": "+lap);
            output[lap_i] = lap - prevLapElapsedTime;
            prevLapElapsedTime = lap;
        }
        return output;
    }

    /***
     * Update the buttons on the stopwatch according to the watch's state
     */
    private void setButtons(int state) {
        switch (state) {
            case Stopwatches.STOPWATCH_RESET:
                setButton(mLeftButton, R.string.sw_lap_button, R.drawable.ic_lap, false,
                        View.INVISIBLE);
                setStartStopText(mCenterButton, R.string.sw_start_button);
                showShareButton(false);
                break;
            case Stopwatches.STOPWATCH_RUNNING:
                setButton(mLeftButton, R.string.sw_lap_button, R.drawable.ic_lap,
                        !reachedMaxLaps(), View.VISIBLE);
                setStartStopText(mCenterButton, R.string.sw_stop_button);
                showShareButton(false);
                break;
            case Stopwatches.STOPWATCH_STOPPED:
                setButton(mLeftButton, R.string.sw_reset_button, R.drawable.ic_reset, true,
                        View.VISIBLE);
                setStartStopText(mCenterButton, R.string.sw_start_button);
                showShareButton(true);
                break;
            default:
                break;
        }
    }
    private boolean reachedMaxLaps() {
        return mLapsAdapter.getCount() >= Stopwatches.MAX_LAPS;
    }

    /***
     * Set a single button with the string and states provided.
     * @param b - Button view to update
     * @param text - Text in button
     * @param enabled - enable/disables the button
     * @param visibility - Show/hide the button
     */
    private void setButton(
            ImageButton b, int text, int drawableId, boolean enabled, int visibility) {
        b.setContentDescription(getActivity().getResources().getString(text));
        b.setImageResource(drawableId);
        b.setVisibility(visibility);
        b.setEnabled(enabled);
    }

    private void setStartStopText(TextView v, int text) {
        String textStr = getActivity().getResources().getString(text);
        v.setText(textStr);
        v.setContentDescription(textStr);
    }

    /***
     *
     * @param time - in hundredths of a second
     */
    private void addLapTime(long time) {
        int size = mLapsAdapter.getCount();
        long curTime = time - mStartTime + mAccumulatedTime;
        if (size == 0) {
            // Always show the ending lap and a new one
            Lap firstLap = new Lap(curTime, curTime);
            mLapsAdapter.addLap(firstLap);
            mLapsAdapter.addLap(new Lap(0, curTime));
            mTime.setIntervalTime(curTime);
            mLapsAdapter.updateTimeFormats(firstLap);
        } else {
            long lapTime = curTime - ((Lap) mLapsAdapter.getItem(1)).mTotalTime;
            ((Lap)mLapsAdapter.getItem(0)).mLapTime = lapTime;
            ((Lap)mLapsAdapter.getItem(0)).mTotalTime = curTime;
            mLapsAdapter.addLap(new Lap(0, 0));
            mTime.setMarkerTime(lapTime);
            mLapsAdapter.updateLapFormat();
        //    mTime.setIntervalTime(lapTime * 10);
        }
        mLapsAdapter.notifyDataSetChanged();
        // Start lap animation starting from the second lap
         mTime.stopIntervalAnimation();
         if (!reachedMaxLaps()) {
             mTime.startIntervalAnimation();
         }
    }

    private void updateCurrentLap(long totalTime) {
        if (mLapsAdapter.getCount() > 0) {
            Lap curLap = (Lap)mLapsAdapter.getItem(0);
            curLap.mLapTime = totalTime - ((Lap)mLapsAdapter.getItem(1)).mTotalTime;
            curLap.mTotalTime = totalTime;
            mLapsAdapter.notifyDataSetChanged();
        }
    }

    private void showLaps() {
        if (mLapsAdapter.getCount() > 0) {
            mLapsList.setVisibility(View.VISIBLE);
        } else {
            mLapsList.setVisibility(View.INVISIBLE);
        }
    }

    private void startUpdateThread() {
        mTime.post(mTimeUpdateThread);
    }

    private void stopUpdateThread() {
        mTime.removeCallbacks(mTimeUpdateThread);
    }

    Runnable mTimeUpdateThread = new Runnable() {
        @Override
        public void run() {
            long curTime = Utils.getTimeNow();
            long totalTime = mAccumulatedTime + (curTime - mStartTime);
            if (mTime != null) {
                mTimeText.setTime(totalTime, true, true);
            }
            if (mLapsAdapter.getCount() > 0) {
                updateCurrentLap(totalTime);
            }
            mTime.postDelayed(mTimeUpdateThread, 10);
        }
    };

    private void writeToSharedPref(SharedPreferences prefs) {
        SharedPreferences.Editor editor = prefs.edit();
        editor.putLong (Stopwatches.PREF_START_TIME, mStartTime);
        editor.putLong (Stopwatches.PREF_ACCUM_TIME, mAccumulatedTime);
        editor.putInt (Stopwatches.PREF_STATE, mState);
        if (mLapsAdapter != null) {
            long [] laps = mLapsAdapter.getLapTimes();
            if (laps != null) {
                editor.putInt (Stopwatches.PREF_LAP_NUM, laps.length);
                for (int i = 0; i < laps.length; i++) {
                    String key = Stopwatches.PREF_LAP_TIME + Integer.toString(laps.length - i);
                    editor.putLong (key, laps[i]);
                }
            }
        }
        if (mState == Stopwatches.STOPWATCH_RUNNING) {
            editor.putLong(Stopwatches.NOTIF_CLOCK_BASE, mStartTime-mAccumulatedTime);
            editor.putLong(Stopwatches.NOTIF_CLOCK_ELAPSED, -1);
            editor.putBoolean(Stopwatches.NOTIF_CLOCK_RUNNING, true);
        } else if (mState == Stopwatches.STOPWATCH_STOPPED) {
            editor.putLong(Stopwatches.NOTIF_CLOCK_ELAPSED, mAccumulatedTime);
            editor.putLong(Stopwatches.NOTIF_CLOCK_BASE, -1);
            editor.putBoolean(Stopwatches.NOTIF_CLOCK_RUNNING, false);
        } else if (mState == Stopwatches.STOPWATCH_RESET) {
            editor.remove(Stopwatches.NOTIF_CLOCK_BASE);
            editor.remove(Stopwatches.NOTIF_CLOCK_RUNNING);
            editor.remove(Stopwatches.NOTIF_CLOCK_ELAPSED);
        }
        editor.putBoolean(Stopwatches.PREF_UPDATE_CIRCLE, false);
        editor.apply();
    }

    private void readFromSharedPref(SharedPreferences prefs) {
        mStartTime = prefs.getLong(Stopwatches.PREF_START_TIME, 0);
        mAccumulatedTime = prefs.getLong(Stopwatches.PREF_ACCUM_TIME, 0);
        mState = prefs.getInt(Stopwatches.PREF_STATE, Stopwatches.STOPWATCH_RESET);
        int numLaps = prefs.getInt(Stopwatches.PREF_LAP_NUM, Stopwatches.STOPWATCH_RESET);
        if (mLapsAdapter != null) {
            long[] oldLaps = mLapsAdapter.getLapTimes();
            if (oldLaps == null || oldLaps.length < numLaps) {
                long[] laps = new long[numLaps];
                long prevLapElapsedTime = 0;
                for (int lap_i = 0; lap_i < numLaps; lap_i++) {
                    String key = Stopwatches.PREF_LAP_TIME + Integer.toString(lap_i + 1);
                    long lap = prefs.getLong(key, 0);
                    laps[numLaps - lap_i - 1] = lap - prevLapElapsedTime;
                    prevLapElapsedTime = lap;
                }
                mLapsAdapter.setLapTimes(laps);
            }
        }
        if (prefs.getBoolean(Stopwatches.PREF_UPDATE_CIRCLE, true)) {
            if (mState == Stopwatches.STOPWATCH_STOPPED) {
                doStop();
            } else if (mState == Stopwatches.STOPWATCH_RUNNING) {
                doStart(mStartTime);
            } else if (mState == Stopwatches.STOPWATCH_RESET) {
                doReset();
            }
        }
    }

    public class ImageLabelAdapter extends ArrayAdapter<CharSequence> {
        private final ArrayList<CharSequence> mStrings;
        private final ArrayList<Drawable> mDrawables;
        private final ArrayList<String> mPackageNames;
        private final ArrayList<String> mClassNames;
        private ImageLabelAdapter mShowAllAdapter;

        public ImageLabelAdapter(Context context, int textViewResourceId,
                ArrayList<CharSequence> strings, ArrayList<Drawable> drawables,
                ArrayList<String> packageNames, ArrayList<String> classNames) {
            super(context, textViewResourceId, strings);
            mStrings = strings;
            mDrawables = drawables;
            mPackageNames = packageNames;
            mClassNames = classNames;
        }

        // Use this constructor if showing a "see all" option, to pass in the adapter
        // that will be needed to quickly show all the remaining options.
        public ImageLabelAdapter(Context context, int textViewResourceId,
                ArrayList<CharSequence> strings, ArrayList<Drawable> drawables,
                ArrayList<String> packageNames, ArrayList<String> classNames,
                ImageLabelAdapter showAllAdapter) {
            super(context, textViewResourceId, strings);
            mStrings = strings;
            mDrawables = drawables;
            mPackageNames = packageNames;
            mClassNames = classNames;
            mShowAllAdapter = showAllAdapter;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater li = getActivity().getLayoutInflater();
            View row = li.inflate(R.layout.popup_window_item, parent, false);
            ((TextView) row.findViewById(R.id.title)).setText(
                    mStrings.get(position));
            ((ImageView) row.findViewById(R.id.icon)).setBackground(
                    mDrawables.get(position));
            return row;
        }

        public String getPackageName(int position) {
            return mPackageNames.get(position);
        }

        public String getClassName(int position) {
            return mClassNames.get(position);
        }

        public ImageLabelAdapter getShowAllAdapter() {
            return mShowAllAdapter;
        }
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
        if (prefs.equals(PreferenceManager.getDefaultSharedPreferences(getActivity()))) {
            if (! (key.equals(Stopwatches.PREF_LAP_NUM) ||
                    key.startsWith(Stopwatches.PREF_LAP_TIME))) {
                readFromSharedPref(prefs);
                if (prefs.getBoolean(Stopwatches.PREF_UPDATE_CIRCLE, true)) {
                    mTime.readFromSharedPref(prefs, "sw");
                }
            }
        }
    }

    // Used to keeps screen on when stopwatch is running.

    private void acquireWakeLock() {
        if (mWakeLock == null) {
            final PowerManager pm =
                    (PowerManager) getActivity().getSystemService(Context.POWER_SERVICE);
            mWakeLock = pm.newWakeLock(
                    PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE, TAG);
            mWakeLock.setReferenceCounted(false);
        }
        mWakeLock.acquire();
    }

    private void releaseWakeLock() {
        if (mWakeLock != null && mWakeLock.isHeld()) {
            mWakeLock.release();
        }
    }

}