package com.maccer.vidcamtest;

import java.io.IOException;
import java.util.List;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.ViewGroup;

abstract class CameraPreview extends ViewGroup implements SurfaceHolder.Callback {

	Camera mCamera;
    SurfaceView mSurfaceView;
    SurfaceHolder mHolder;
	List<Size> mSupportedPreviewSizes;
	Object mPreviewSize;

    CameraPreview(Context context) {
        super(context);

        mSurfaceView = new SurfaceView(context);
        addView(mSurfaceView);

        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = mSurfaceView.getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void setCamera(Camera camera) {
        if (mCamera == camera) { return; }

        stopPreviewAndFreeCamera();

        mCamera = camera;

        if (mCamera != null) {
            List<Size> localSizes = mCamera.getParameters().getSupportedPreviewSizes();
            mSupportedPreviewSizes = localSizes;
            requestLayout();

            try {
                mCamera.setPreviewDisplay(mHolder);
            } catch (IOException e) {
                e.printStackTrace();
            }

            /*
              Important: Call startPreview() to start updating the preview surface. Preview must
              be started before you can take a picture.
              */
            mCamera.startPreview();
        }
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // Now that the size is known, set up the camera parameters and begin
        // the preview.
        Camera.Parameters parameters = mCamera.getParameters();
        //parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
        parameters.setPreviewSize(w, h);
        requestLayout();
        mCamera.setParameters(parameters);

        /*
          Important: Call startPreview() to start updating the preview surface. Preview must be
          started before you can take a picture.
        */
        mCamera.startPreview();
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // Surface will be destroyed when we return, so stop the preview.
        if (mCamera != null) {
            /*
              Call stopPreview() to stop updating the preview surface.
            */
            mCamera.stopPreview();
        }
    }

    /**
      * When this function returns, mCamera will be null.
      */
    private void stopPreviewAndFreeCamera() {

        if (mCamera != null) {
            /*
              Call stopPreview() to stop updating the preview surface.
            */
            mCamera.stopPreview();

            /*
              Important: Call release() to release the camera for use by other applications.
              Applications should release the camera immediately in onPause() (and re-open() it in
              onResume()).
            */
            mCamera.release();

            mCamera = null;
        }
    }
}