package uk.co.metricat.canvasbase64;

import android.graphics.Bitmap;
import android.graphics.drawable.*;
import android.util.Base64;

import android.view.*;
import com.google.appinventor.components.annotations.SimpleEvent;
import com.google.appinventor.components.annotations.SimpleFunction;
import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;
import com.google.appinventor.components.runtime.ComponentContainer;
import com.google.appinventor.components.runtime.EventDispatcher;
import java.io.ByteArrayOutputStream;
import java.lang.reflect.*;

import com.google.appinventor.components.runtime.Canvas;
//import com.google.appinventor.components.runtime.Component;

public class CanvasBase64 extends AndroidNonvisibleComponent {

  public CanvasBase64(ComponentContainer container) {
    super(container.$form());

  }

  @SimpleFunction(description = "Get Canvas Image and returns base64 string")
  public void GetCanvasImageAsBase64(final Canvas canvas ) throws Exception {
    final View canvasView = canvas.getView();
    final Method method = canvasView.getClass().getDeclaredMethod("buildCache");
    method.setAccessible(true);
    Bitmap imageBitmap = (Bitmap) method.invoke(canvasView);
    String encodedString = bitMapToBase64(imageBitmap);
    AfterCanvasBase64(encodedString);
  }

  public String bitMapToBase64(Bitmap bitMap) {
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    bitMap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
    byte[] byteArray = byteArrayOutputStream.toByteArray();
    return Base64.encodeToString(byteArray, Base64.DEFAULT);
  }

  @SimpleEvent(description = "Called after the canvas image is converted. The text argument `canvasBase64Data` is the base64 string of the canvas image")
  public void AfterCanvasBase64(String canvasBase64Data) {
    EventDispatcher.dispatchEvent(this, "AfterCanvasBase64", canvasBase64Data);
  }
}