content: /*
   * Copyright (C) The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.adafruit.bluefruit.le.connect.app.settings.barcode;
  
  import android.Manifest;
  import android.content.Context;
  import android.content.res.Configuration;
  import android.support.annotation.RequiresPermission;
  import android.util.AttributeSet;
  import android.util.Log;
  import android.view.SurfaceHolder;
  import android.view.SurfaceView;
  import android.view.ViewGroup;
  
  import com.google.android.gms.common.images.Size;
  
  import java.io.IOException;
  
  public class CameraSourcePreview extends ViewGroup {
      private static final String TAG = "CameraSourcePreview";
  
      private Context mContext;
      private SurfaceView mSurfaceView;
      private boolean mStartRequested;
      private boolean mSurfaceAvailable;
      private CameraSource mCameraSource;
  
      private GraphicOverlay mOverlay;
  
      public CameraSourcePreview(Context context, AttributeSet attrs) {
          super(context, attrs);
          mContext = context;
          mStartRequested = false;
          mSurfaceAvailable = false;
  
          mSurfaceView = new SurfaceView(context);
          mSurfaceView.getHolder().addCallback(new SurfaceCallback());
          addView(mSurfaceView);
      }
  
      @RequiresPermission(Manifest.permission.CAMERA)
      public void start(CameraSource cameraSource) throws IOException, SecurityException {
          if (cameraSource == null) {
              stop();
          }
  
          mCameraSource = cameraSource;
  
          if (mCameraSource != null) {
              mStartRequested = true;
              startIfReady();
          }
      }
  
      @RequiresPermission(Manifest.permission.CAMERA)
      public void start(CameraSource cameraSource, GraphicOverlay overlay) throws IOException, SecurityException {
          mOverlay = overlay;
          start(cameraSource);
      }
  
      public void stop() {
          if (mCameraSource != null) {
              mCameraSource.stop();
          }
      }
  
      public void release() {
          if (mCameraSource != null) {
              mCameraSource.release();
              mCameraSource = null;
          }
      }
  
      @RequiresPermission(Manifest.permission.CAMERA)
      private void startIfReady() throws IOException, SecurityException {
          if (mStartRequested && mSurfaceAvailable) {
              mCameraSource.start(mSurfaceView.getHolder());
              if (mOverlay != null) {
                  Size size = mCameraSource.getPreviewSize();
                  int min = Math.min(size.getWidth(), size.getHeight());
                  int max = Math.max(size.getWidth(), size.getHeight());
                  if (isPortraitMode()) {
                      // Swap width and height sizes when in portrait, since it will be rotated by
                      // 90 degrees
                      mOverlay.setCameraInfo(min, max, mCameraSource.getCameraFacing());
                  } else {
                      mOverlay.setCameraInfo(max, min, mCameraSource.getCameraFacing());
                  }
                  mOverlay.clear();
              }
              mStartRequested = false;
          }
      }
  
      private class SurfaceCallback implements SurfaceHolder.Callback {
          @Override
          public void surfaceCreated(SurfaceHolder surface) {
              mSurfaceAvailable = true;
              try {
                  startIfReady();
              } catch (SecurityException se) {
                  Log.e(TAG,"Do not have permission to start the camera", se);
              } catch (IOException e) {
                  Log.e(TAG, "Could not start camera source.", e);
              }
          }
  
          @Override
          public void surfaceDestroyed(SurfaceHolder surface) {
              mSurfaceAvailable = false;
          }
  
          @Override
          public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
          }
      }
  
      @Override
      protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
  
          /*
          int width = 320;
          int height = 240;
          if (mCameraSource != null) {
              Size size = mCameraSource.getPreviewSize();
              if (size != null) {
                  width = size.getWidth();
                  height = size.getHeight();
              }
          }
  
          // Swap width and height sizes when in portrait, since it will be rotated 90 degrees
          if (isPortraitMode()) {
              int tmp = width;
              //noinspection SuspiciousNameCombination
              width = height;
              height = tmp;
          }
  
          final int layoutWidth = right - left;
          final int layoutHeight = bottom - top;
  
          // Computes height and width for potentially doing fit width.
          int childWidth = layoutWidth;
          int childHeight = (int)(((float) layoutWidth / (float) width) * height);
  
          // If height is too tall using fit width, does fit height instead.
          if (childHeight > layoutHeight) {
              childHeight = layoutHeight;
              childWidth = (int)(((float) layoutHeight / (float) height) * width);
          }
  
          for (int i = 0; i < getChildCount(); ++i) {
              getChildAt(i).layout(0, 0, childWidth, childHeight);
          }
  
          try {
              startIfReady();
          } catch (SecurityException se) {
              Log.e(TAG,"Do not have permission to start the camera", se);
          } catch (IOException e) {
              Log.e(TAG, "Could not start camera source.", e);
          }
          */
  
          int width = 320;
          int height = 240;
          if (mCameraSource != null)
          {
              Size size = mCameraSource.getPreviewSize();
              if (size != null)
              {
                  width = size.getWidth();
                  height = size.getHeight();
              }
          }
  
          // Swap width and height sizes when in portrait, since it will be rotated 90 degrees
          if (isPortraitMode())
          {
              int tmp = width;
  
              //noinspection SuspiciousNameCombination
              width = height;
              height = tmp;
          }
  
          final int layoutWidth = right - left;
          final int layoutHeight = bottom - top;
  
          // Computes height and width for potentially doing fit width.
          int childWidth = layoutWidth;
          int childHeight = (int) (((float) layoutWidth / (float) width) * height);
  
          for (int i = 0; i < getChildCount(); ++i)
          {
              getChildAt(i).layout(0, 0, childWidth, layoutHeight);
          }
  
          try
          {
              startIfReady();
          }
          catch (SecurityException se)
          {
              Log.e(TAG, "Do not have permission to start the camera", se);
          }
          catch (IOException e)
          {
              Log.e(TAG, "Could not start camera source.", e);
          }
  
      }
  
      private boolean isPortraitMode() {
          int orientation = mContext.getResources().getConfiguration().orientation;
          if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
              return false;
          }
          if (orientation == Configuration.ORIENTATION_PORTRAIT) {
              return true;
          }
  
          Log.d(TAG, "isPortraitMode returning false by default");
          return false;
      }
  }
  