import java.io.IOException;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.ViewGroup;
import android.webkit.WebView;

import com.MyCustomContext;


public class CameraPluginView extends ViewGroup implements SurfaceHolder.Callback {
    private final String TAG = "camera.CameraPluginView";

    MyCustomContext customContext;
    SurfaceView surfaceView;
    public WebView overlayWebView;

    Camera camera;

    public CameraPluginView(final MyCustomContext customContext){
        super(customContext);
        this.setBackgroundColor(Color.WHITE);
        this.customContext = customContext;
        this.surfaceView = new SurfaceView(customContext);
        this.surfaceView.getHolder().addCallback(this);
        this.addView(this.surfaceView);
        context.getActivity().runOnUiThread(new Runnable() {
            @SuppressLint("SetJavaScriptEnabled")
            public void run(){
                addView(surfaceView);
                overlayWebView = new OverlayWebView(customContext);
                overlayWebView.getSettings().setJavaScriptEnabled(true);
                overlayWebView.getSettings().setDatabaseEnabled(true);
                overlayWebView.addJavascriptInterface(
                    new Object() {
                        @SuppressWarnings("unused")
                        public void callParentView(final String js){
                            context.getActivity().runOnUiThread(new Runnable(){
                                public void run(){
                                    context.loadUrl("javascript:" + js);
                                }
                            });
                        }
                    },
                    "root"
                );
                overlayWebView.setBackgroundColor(0 << 24);
                overlayWebView.setLayerType(WebView.LAYER_TYPE_SOFTWARE, null);
                addView(overlayWebView);
            }
        });
    }

    public CameraPluginView(Context context){
        super(context);
    }

    public void setCamera(Camera camera){
        this.camera = camera;
        if(camera != null){
            try {
                this.camera.setPreviewDisplay(this.surfaceView.getHolder());
                this.camera.startPreview();
            } catch (IOException e) {
                e.printStackTrace();
            }
            this.requestLayout();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        if(this.camera != null){
            this.setCamera(this.camera);
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if(this.camera != null){
            this.setCamera(this.camera);
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b){
        int width = r - l;
        int height = b - t;
        this.getChildAt(0).layout(0, 0, width, height);
        if(this.getChildCount() > 1){
            this.getChildAt(1).layout(0, 0, width, height);
        }
    }
}

class OverlayWebView extends WebView {

    public OverlayWebView(Context context) {
        super(context);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        invalidate(); // Invalidate all the time so there is no lag on display.
    }

}