package com.dinect.checker.zbar;

import android.content.Intent;
import android.hardware.Camera;
import android.os.Bundle;
import android.os.Handler;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.dinect.checker.AbstractScannerActivity;
import com.dinect.checker.R;
import com.dinect.checker.Utils;

import net.sourceforge.zbar.Config;
import net.sourceforge.zbar.Image;
import net.sourceforge.zbar.ImageScanner;
import net.sourceforge.zbar.Symbol;
import net.sourceforge.zbar.SymbolSet;

public class CameraActivity extends AbstractScannerActivity implements
        Camera.PreviewCallback {

    public static final String ERROR_INFO = "ERROR_INFO";

    private int mOffset;

    private CameraPreview mPreview;
    private Camera mCamera;
    private ImageScanner mScanner;
    private Handler mAutoFocusHandler;
    private boolean mPreviewing = true;

    static {
        System.loadLibrary("iconv");
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (!init(R.layout.a_zbar)) {
            return;
        }

        initToolbar(getIntent());

        mPreview = (CameraPreview) initScanner();

        addScanner(mPreview, R.id.zbarRoot);

    }

    @Override
    protected View initScanner() {
        mOffset = (int) (56 * getResources().getDisplayMetrics().density);

        mAutoFocusHandler = new Handler();

        // create and configure image scanner
        mScanner = new ImageScanner();
        mScanner.setConfig(0, Config.X_DENSITY, 3);
        mScanner.setConfig(0, Config.Y_DENSITY, 3);

        int[] symbols = getIntent().getIntArrayExtra(SCAN_MODES);
        if (symbols != null) {
            mScanner.setConfig(Symbol.NONE, Config.ENABLE, 0);
            for (int symbol : symbols) {
                mScanner.setConfig(symbol, Config.ENABLE, 1);
            }
        }

        mPreview = new CameraPreview(this, this, autoFocusCB);

        return mPreview;
    }

    @Override
    public void onResume() {
        super.onResume();

        // Open the default i.e. the first rear facing camera.
        mCamera = Camera.open();
        if (mCamera == null) {
            // Cancel request if mCamera is null.
            cancelRequest();
            return;
        }

        mPreview.setCamera(mCamera);
        mPreview.showSurfaceView();

        mPreviewing = true;
    }

    @Override
    public void onPause() {
        super.onPause();

        // Because the Camera object is a shared resource, it's very
        // important to release it when the activity is paused.
        if (mCamera != null) {
            mPreview.setCamera(null);
            mCamera.cancelAutoFocus();
            mCamera.setPreviewCallback(null);
            mCamera.stopPreview();
            mCamera.release();

            // According to Jason Kuang on http://stackoverflow.com/questions/6519120/how-to-recover-camera-preview-from-sleep,
            // there might be surface recreation problems when the device goes to sleep. So lets just hide it and
            // recreate on resume
            mPreview.hideSurfaceView();

            mPreviewing = false;
            mCamera = null;
        }
    }

    public void cancelRequest() {
        Intent dataIntent = new Intent();
        dataIntent.putExtra(ERROR_INFO, "Camera unavailable");
        setResult(RESULT_CANCELED, dataIntent);
        finish();
    }

    public void onPreviewFrame(byte[] data, Camera camera) {
        if (mPreviewing) {
            Camera.Parameters parameters = camera.getParameters();
            Camera.Size size = parameters.getPreviewSize();

            Image barcode = new Image(size.width, size.height, "Y800");
            barcode.setData(data);
            barcode.setCrop((size.width / 2) - mOffset, 0, (size.width / 2) + mOffset, size.height);

            int result = mScanner.scanImage(barcode);

            if (result != 0) {
                mPreviewing = false;
                SymbolSet syms = mScanner.getResults();
                for (Symbol sym : syms) {
                    String symData = sym.getData();
                    if (!TextUtils.isEmpty(symData) && Utils.isOnline(this)) {
                        requestUser(sym.getData());
                        break;
                    } else {
                        mPreviewing = true;
                        Toast.makeText(this, "Проверьте интернет соединение", Toast.LENGTH_SHORT).show();
                    }
                }
            }
        }
    }

    private Runnable doAutoFocus = new Runnable() {
        public void run() {
            if (mCamera != null && mPreviewing) {
                mCamera.autoFocus(autoFocusCB);
            }
        }
    };

    // Mimic continuous auto-focusing
    Camera.AutoFocusCallback autoFocusCB = new Camera.AutoFocusCallback() {
        public void onAutoFocus(boolean success, Camera camera) {
            mAutoFocusHandler.postDelayed(doAutoFocus, 1000);
        }
    };

    @Override
    public void onBackPressed() {
        setResult(RESULT_CANCELED);
        finish();
    }

    private void requestUser(String code) {
        handleBarcode(code);
    }
}
