package dk.thoerup.android.barcodesample;

import android.app.Activity;
import android.content.Intent;
import android.hardware.Camera;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;

import java.io.IOException;


public class CamActivity extends ActionBarActivity {


    Camera cam;
    SurfaceView surfaceView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cam);


        surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
            }

            public void surfaceCreated(SurfaceHolder holder) {
                Log.i("CAM", "surface created");
                try {
                    cam.setPreviewDisplay(holder);
                    cam.startPreview();
                } catch (IOException e) {
                    Log.d("CAM", "Error opening cam", e);
                }


            }

            public void surfaceDestroyed(SurfaceHolder holder) {
            }
        });

        surfaceView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                cam.takePicture(
                        new Camera.ShutterCallback() {
                            @Override
                            public void onShutter() {
                            }
                        },
                        new Camera.PictureCallback() {//raw
                            @Override
                            public void onPictureTaken(byte[] data, Camera camera) {

                            }
                        },
                        new Camera.PictureCallback() {//postview
                            @Override
                            public void onPictureTaken(byte[] data, Camera camera) {

                            }
                        },
                        new Camera.PictureCallback() { //JPEG
                            @Override
                            public void onPictureTaken(byte[] data, Camera camera) {
                                cam.release();

                                Intent resultIntent = new Intent();
                                resultIntent.putExtra("DATA", data);
                                CamActivity.this.setResult(Activity.RESULT_OK, resultIntent);

                                CamActivity.this.finish();
                            }
                        });

            }

        });

        cam = Camera.open();
        setCameraDisplayOrientation(this,0,cam);
    }

    /*
     * lånt fra
     * http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation(int)
     */
    public static void setCameraDisplayOrientation(Activity activity, int cameraId, android.hardware.Camera camera) {
        android.hardware.Camera.CameraInfo info =  new android.hardware.Camera.CameraInfo();
        android.hardware.Camera.getCameraInfo(cameraId, info);
        int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();

        int degrees = 0;
        switch (rotation) {
            case Surface.ROTATION_0: degrees = 0; break;
            case Surface.ROTATION_90: degrees = 90; break;
            case Surface.ROTATION_180: degrees = 180; break;
            case Surface.ROTATION_270: degrees = 270; break;
        }

        int result;
        if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
            result = (info.orientation + degrees) % 360;
            result = (360 - result) % 360;  // compensate the mirror
        } else {  // back-facing
            result = (info.orientation - degrees + 360) % 360;
        }
        camera.setDisplayOrientation(result);
    }


    @Override
    protected void onPause () {
        super.onPause();
        cam.release();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_cam, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}