/*
 * Copyright (C) 2008 ZXing authors
 *
 * 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.reactnativecomponent.barcode.decoding;

import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.ResultPointCallback;
import com.reactnativecomponent.barcode.CaptureView;
import com.reactnativecomponent.barcode.R;


import java.util.Hashtable;
import java.util.Vector;
import java.util.concurrent.CountDownLatch;

/**
 * This thread does all the heavy lifting of decoding the images.
 *
 * @author [email protected] (Daniel Switkin)
 */
final class DecodeThread extends Thread {

  public static final String BARCODE_BITMAP = "barcode_bitmap";

  private final CaptureView captureView;
  private final Hashtable<DecodeHintType, Object> hints;
  private DecodeHandler handler;
  private final CountDownLatch handlerInitLatch;//到计数的锁
  public boolean flag=true;

  DecodeThread(CaptureView captureView,
               Vector<BarcodeFormat> decodeFormats,
               String characterSet,
               ResultPointCallback resultPointCallback) {
//    Log.i("Test", "DecodeThread create");
    this.captureView = captureView;
    handlerInitLatch = new CountDownLatch(1);//从1开始到计数

    hints = new Hashtable<DecodeHintType, Object>(3);

//    // The prefs can't change while the thread is running, so pick them up once here.
//    if (decodeFormats == null || decodeFormats.isEmpty()) {
//      SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
//      decodeFormats = new Vector<BarcodeFormat>();
//      if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_1D, true)) {
//        decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
//      }
//      if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_QR, true)) {
//        decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
//      }
//      if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_DATA_MATRIX, true)) {
//        decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
//      }
//    }
    if (decodeFormats == null || decodeFormats.isEmpty()) {
    	 decodeFormats = new Vector<BarcodeFormat>();
    	 decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
    	 decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
    	 decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
    	 
    }
    
    hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);

    if (characterSet != null) {
      hints.put(DecodeHintType.CHARACTER_SET, characterSet);
    }

    hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, resultPointCallback);
  }

  Handler getHandler() {
    try {
      handlerInitLatch.await();//阻塞先等handler被初始化了才能返回结果。改计数锁即等countdown-->0。
    } catch (InterruptedException ie) {
      // continue?
    }
    return handler;
  }

  @Override
  public void run() {

    Looper.prepare();
      handler = new DecodeHandler(captureView, hints);
      handlerInitLatch.countDown();//启动到计数，countdown-1 变成0；
//    Log.i("Test","The worker thread id = " +   Thread.currentThread().getId()); //判断线程ID
    Looper.loop();

  }



}