package org.oscim.app.preferences;

import android.content.Context;
import android.content.res.TypedArray;
import android.preference.Preference;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.RelativeLayout;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

import org.oscim.app.R;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CacheSizePreference extends Preference implements OnSeekBarChangeListener {
    final static Logger log = LoggerFactory.getLogger(CacheSizePreference.class);

    private static final String NS_OCIM_APP = "http://app.oscim.org";
    private static final int DEFAULT_VALUE = 50;

    private int mMaxValue = 50;
    private int mMinValue = 0;
    private int mInterval = 1;
    private int mCurrentValue;
    private String mUnitsLeft = "";
    private String mUnitsRight = "";
    private SeekBar mSeekBar;

    private TextView mStatusText;

    public CacheSizePreference(Context context, AttributeSet attrs) {
        super(context, attrs);
        initPreference(context, attrs);
    }

    public CacheSizePreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initPreference(context, attrs);
    }

    private void initPreference(Context context, AttributeSet attrs) {
        setValuesFromXml(attrs);
        mSeekBar = new SeekBar(context, attrs);
        mSeekBar.setMax(mMaxValue - mMinValue);
        mSeekBar.setOnSeekBarChangeListener(this);
    }

    private void setValuesFromXml(AttributeSet attrs) {
        //StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
        //double sdAvailSize = (double) stat.getAvailableBlocks()
        //        * (double) stat.getBlockSize();
        //One binary megabyte equals 1,048,576 bytes.
        // otherwise we need an logarithmic scale to set a sane value with the slider...
        int megaAvailable = 50; //(int)sdAvailSize / 1048576;

        mMaxValue = megaAvailable;//attrs.getAttributeIntValue(ANDROIDNS, "max", 100);
        mMinValue = attrs.getAttributeIntValue(NS_OCIM_APP, "min", 0);

        mUnitsLeft = getAttributeStringValue(attrs, NS_OCIM_APP, "unitsLeft", "");
        //String units = getAttributeStringValue(attrs, NS_OCIM_APP, "units", "");
        mUnitsRight = "/" + String.valueOf(megaAvailable) + "MB";
        try {
            String newInterval = attrs.getAttributeValue(NS_OCIM_APP, "interval");
            if (newInterval != null)
                mInterval = Integer.parseInt(newInterval);
        } catch (Exception e) {
            log.error("", e);
        }

    }

    private String getAttributeStringValue(AttributeSet attrs, String namespace, String name,
                                           String defaultValue) {
        String value = attrs.getAttributeValue(namespace, name);
        if (value == null)
            value = defaultValue;

        return value;
    }

    @Override
    protected View onCreateView(ViewGroup parent) {

        RelativeLayout layout = null;

        try {
            LayoutInflater mInflater = (LayoutInflater) getContext().getSystemService(
                    Context.LAYOUT_INFLATER_SERVICE);

            layout = (RelativeLayout) mInflater
                    .inflate(R.layout.seek_bar_preference, parent, false);
        } catch (Exception e) {
            log.error("", e);
        }

        return layout;

    }

    @SuppressWarnings("deprecation")
    @Override
    public void onBindView(View view) {
        super.onBindView(view);

        try {
            // move our seekbar to the new view we've been given
            ViewParent oldContainer = mSeekBar.getParent();
            ViewGroup newContainer = (ViewGroup) view.findViewById(R.id.seekBarPrefBarContainer);

            if (oldContainer != newContainer) {
                // remove the seekbar from the old view
                if (oldContainer != null) {
                    ((ViewGroup) oldContainer).removeView(mSeekBar);
                }
                // remove the existing seekbar (there may not be one) and add ours
                newContainer.removeAllViews();
                newContainer.addView(mSeekBar, ViewGroup.LayoutParams.FILL_PARENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT);
            }
        } catch (Exception ex) {
            log.error("Error binding view: " + ex.toString());
        }

        updateView(view);
    }

    /**
     * Update a SeekBarPreference view with our current state
     *
     * @param view
     */
    protected void updateView(View view) {

        try {
            RelativeLayout layout = (RelativeLayout) view;

            mStatusText = (TextView) layout.findViewById(R.id.seekBarPrefValue);
            mStatusText.setText(String.valueOf(mCurrentValue));
            mStatusText.setMinimumWidth(30);

            mSeekBar.setProgress(mCurrentValue - mMinValue);

            TextView unitsRight = (TextView) layout.findViewById(R.id.seekBarPrefUnitsRight);
            unitsRight.setText(mUnitsRight);

            TextView unitsLeft = (TextView) layout.findViewById(R.id.seekBarPrefUnitsLeft);
            unitsLeft.setText(mUnitsLeft);

        } catch (Exception e) {
            log.error("", e);
        }

    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        int newValue = progress + mMinValue;

        if (newValue > mMaxValue)
            newValue = mMaxValue;
        else if (newValue < mMinValue)
            newValue = mMinValue;
        else if (mInterval != 1 && newValue % mInterval != 0)
            newValue = Math.round(((float) newValue) / mInterval) * mInterval;

        // change rejected, revert to the previous value
        if (!callChangeListener(newValue)) {
            seekBar.setProgress(mCurrentValue - mMinValue);
            return;
        }

        // change accepted, store it
        mCurrentValue = newValue;
        mStatusText.setText(String.valueOf(newValue));
        persistInt(newValue);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        notifyChanged();
    }

    @Override
    protected Object onGetDefaultValue(TypedArray ta, int index) {

        int defaultValue = ta.getInt(index, DEFAULT_VALUE);
        return defaultValue;

    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {

        if (restoreValue) {
            mCurrentValue = getPersistedInt(mCurrentValue);
        } else {
            int temp = 0;
            try {
                temp = (Integer) defaultValue;
            } catch (Exception ex) {
                log.error("Invalid default value: " + defaultValue.toString());
            }

            persistInt(temp);
            mCurrentValue = temp;
        }

    }

}
