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package com.taobao.weex.common;

import android.os.Handler;
import android.os.Handler.Callback;
import android.os.HandlerThread;
import android.os.Message;
import com.taobao.weex.WXEnvironment;
import com.taobao.weex.utils.WXLogUtils;

/**
 * Thread used in weex
 */
public class WXThread extends HandlerThread {

  private Handler mHandler;

  static class SafeRunnable implements Runnable {

    static final String TAG = "SafeRunnable";

    final Runnable mTask;
    SafeRunnable(Runnable task){
      mTask = task;
    }

    @Override
    public void run() {
      try {
        if(mTask != null)
          mTask.run();
      }catch (Throwable e){
        //catch everything may throw from exection.
        if(WXEnvironment.isApkDebugable()){
          WXLogUtils.e(TAG,"SafeRunnable run throw expection:"+e.getMessage());
          throw e;
        }
      }
    }
  }

  static class SafeCallback implements Callback {
    static final String TAG = "SafeCallback";

    final Callback mCallback;
    SafeCallback(Callback cb){
      mCallback = cb;
    }

    @Override
    public boolean handleMessage(Message msg) {
      boolean result = false;
      try{
        if(mCallback != null){
          result = mCallback.handleMessage(msg);
        }
      }catch (Throwable e){
        //catch everything may throw from exection.
        if(WXEnvironment.isApkDebugable()){
          WXLogUtils.e(TAG,"SafeCallback handleMessage throw expection:"+e.getMessage());
          throw e;
        }
      }
      return result;
    }
  }

  /**
   * Secure Runnable to prevent throw during execution.
   * @param runnable
   * @return
   */
  public static Runnable secure(Runnable runnable){
    if(runnable == null || runnable instanceof SafeRunnable){
      return runnable;
    }
    return new SafeRunnable(runnable);
  }

  public static Callback secure(Callback callback){
    if(callback == null || callback instanceof SafeCallback){
      return callback;
    }

    return new SafeCallback(callback);
  }

  /**
   * @param name name of thread
   */
  public WXThread(String name) {
    super(name);
    start();
    mHandler = new Handler(getLooper());
  }


  public WXThread(String name, Callback callback) {
    super(name);
    start();
    mHandler = new Handler(getLooper(), secure(callback));
  }

  /**
   * @param name name of thread
   * @param priority The priority to run the thread at. The value supplied must be from
   *                 {@link android.os.Process} and not from java.lang.Thread.
   */
  public WXThread(String name, int priority, Callback callback) {
    super(name, priority);
    start();
    mHandler = new Handler(getLooper(), secure(callback));
  }

  /**
   * @param name name of thread
   * @param priority The priority to run the thread at. The value supplied must be from
   *                 {@link android.os.Process} and not from java.lang.Thread.
   */
  public WXThread(String name, int priority) {
    super(name, priority);
    start();
    mHandler = new Handler(getLooper());
  }

  public Handler getHandler() {
    return mHandler;
  }

  public boolean isWXThreadAlive() {
    return (mHandler != null && getLooper() != null && isAlive());
  }

  @Override
  public boolean quit() {
    if (mHandler != null) {
      mHandler.removeCallbacksAndMessages(null);
    }
    return super.quit();
  }

}