package nextrek.widgets;

import android.content.Context;
import android.util.AttributeSet;
import android.view.Display;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ListView;

public class VList extends ListView {
    
    private final static float MIN_ZOOM = 1.0f;
    private final static float MAX_ZOOM = 4.0f;
    private final static int ZOOM_REFRESH_DELAY = 50;
    
    private final static int SCROLLBAR_PADDING = 15;
    
    private ScaleGestureDetector mScaleDetector;
    private float mScaleFactor = 1.0f;

    public VList(Context context) {
        super(context);
        initView();
    }
    
    public VList(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView();
    }
    
    private void initView() {
        
        setScrollBarStyle(SCROLLBARS_INSIDE_OVERLAY);

        setPadding(0, 0, 0, 0);
        
        setClickable(false);
        setFocusable(false);
        setFocusableInTouchMode(false);
        
        setItemsCanFocus(false);
        
        setChoiceMode(CHOICE_MODE_NONE);
        setDescendantFocusability(FOCUS_BLOCK_DESCENDANTS);

        setPersistentDrawingCache(ViewGroup.PERSISTENT_NO_CACHE);
        setDrawingCacheEnabled(false);
        destroyDrawingCache();
        
        //setDivider(null);
        
        //setHorizontalScrollBarEnabled(true);
        
        setDividerHeight(50);
        
        setOnScrollListener(listViewScrollListener);
        
        mScaleDetector = new ScaleGestureDetector(getContext(), new ScaleListener());
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return true;
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        mScaleDetector.onTouchEvent(event);
        
        return super.onTouchEvent(event);
    }

    public static int screenWidth = 1024;
    public static int baseScreenWidth = 1024;

    long lastNotification = 0;

    public void resetGridScale(Display display) {
        baseScreenWidth = screenWidth = (int) ((display.getWidth()-SCROLLBAR_PADDING) *  mScaleFactor);
        ((BaseAdapter) getAdapter()).notifyDataSetChanged();
    }

    public void updateGridScale() {
        screenWidth = (int) (baseScreenWidth * mScaleFactor);

        long timestamp = System.currentTimeMillis();
        if (timestamp > lastNotification) {
            //System.out.println("width: " + screenWidth + " scale: " + mScaleFactor);
            //((BaseAdapter) getAdapter()).notifyDataSetChanged();
            invalidateViews();
            lastNotification = System.currentTimeMillis() + ZOOM_REFRESH_DELAY;
        }
    }
    
    OnScrollListener listViewScrollListener = new OnScrollListener() {

        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState) {
        }

        @Override
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
            mFirstVisibleItem = firstVisibleItem;
        }
    };

    int mFirstVisibleItem = 0;

    public int getFirstVisibleItem() {
        return mFirstVisibleItem;
    }

    public void setFirstVisibleItem(int current_tile) {
        mFirstVisibleItem = current_tile;
        setSelection(mFirstVisibleItem);
    }
    
    private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
    @Override
    public boolean onScale(ScaleGestureDetector detector) {
        mScaleFactor *= detector.getScaleFactor();
        
        // Don't let the object get too small or too large.
        mScaleFactor = Math.max(MIN_ZOOM, Math.min(mScaleFactor, MAX_ZOOM));
        
        updateGridScale();
        
        return true;
    }
}
}