/*
 * 				Firetweet - Twitter client for Android
 * 
 *  Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com>
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.getlantern.firetweet.nyan;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;

public class NyanDaydreamView extends View {

    private final InvalidateRunnable mInvalidateRunnable;

    private final NyanDrawingHelper mNyanDrawingHelper;

    public NyanDaydreamView(final Context context) {
        this(context, null);
    }

    public NyanDaydreamView(final Context context, final AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public NyanDaydreamView(final Context context, final AttributeSet attrs, final int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
        mNyanDrawingHelper = new DreamViewNyanDrawingHelper(this);
        mInvalidateRunnable = new InvalidateRunnable(this);
    }

    public void setScale(final float scale) {
        mNyanDrawingHelper.setScale(scale);
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        post(mInvalidateRunnable);
    }

    @Override
    protected void onDetachedFromWindow() {
        removeCallbacks(mInvalidateRunnable);
        super.onDetachedFromWindow();
    }

    @Override
    protected void onDraw(final Canvas canvas) {
        super.onDraw(canvas);
        mNyanDrawingHelper.dispatchDraw(canvas);
    }

    @Override
    protected void onSizeChanged(final int w, final int h, final int oldw, final int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mNyanDrawingHelper.dispatchSizeChanged(w, h);
    }

    private static final class DreamViewNyanDrawingHelper extends NyanDrawingHelper {

        private final int mDisplayHeight;
        private final NyanDaydreamView mView;

        public DreamViewNyanDrawingHelper(final NyanDaydreamView view) {
            super(view.getContext());
            mView = view;
            final Resources res = getResources();
            final DisplayMetrics dm = res.getDisplayMetrics();
            mDisplayHeight = dm.heightPixels;
        }

        @Override
        protected int getRainbowYOffset() {
            final int visibility = mView.getSystemUiVisibility();
            if ((visibility & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) != 0) return 0;
            return mDisplayHeight - getHeight();
        }

    }

    private static final class InvalidateRunnable implements Runnable {

        private final View mView;

        InvalidateRunnable(final View view) {
            mView = view;
        }

        @Override
        public void run() {
            mView.invalidate();
            mView.postDelayed(this, 66);
        }

    }

}