package dev.hienlt.my;

import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by hien.le on 21/11/2018.
 */

public class OverlayLayout extends View implements ValueAnimator.AnimatorUpdateListener {
    private static final String TAG = OverlayLayout.class.getSimpleName();
    private Paint paint;
    private Paint paintLine;
    private RectF rectF;
    private int overlayWidth;
    private int overlayHeight;
    private ValueAnimator valueAnimator;
    private float lineY;

    public OverlayLayout(Context context) {
        super(context);
        init();
    }

    public OverlayLayout(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        overlayWidth = (int) (w * 0.7f);
        overlayHeight = (int) (overlayWidth * (10 / 16f));
        float left = (w - overlayWidth) / 2f;
        float top = (h - overlayHeight) / 2f;
        rectF.set(left, top, left + overlayWidth, top + overlayHeight);
        if (valueAnimator != null) {
            valueAnimator.setFloatValues(top, top + overlayHeight);
            valueAnimator.start();
        }
    }

    private void init() {
        setLayerType(View.LAYER_TYPE_HARDWARE, null);
        paint = new Paint();
        paint.setColor(Color.WHITE);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));

        paintLine = new Paint();
        paintLine.setColor(Color.WHITE);
        paintLine.setStyle(Paint.Style.STROKE);
        paintLine.setStrokeWidth(4);
        paintLine.setAntiAlias(true);

        rectF = new RectF();
        valueAnimator = new ValueAnimator();
        valueAnimator.setRepeatMode(ValueAnimator.REVERSE);
        valueAnimator.setRepeatCount(ValueAnimator.INFINITE);
        valueAnimator.setDuration(3000);
        valueAnimator.addUpdateListener(this);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawColor(Color.argb(170, 0, 0, 0));
        canvas.drawRect(rectF, paint);

        canvas.drawLine(rectF.left, lineY, rectF.right, lineY, paintLine);
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (valueAnimator != null) {
            valueAnimator.cancel();
        }
    }

    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
        lineY = (float) animation.getAnimatedValue();
        invalidate();
    }
}