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package com.taobao.weex.dom;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.taobao.weex.WXEnvironment;
import com.taobao.weex.WXSDKInstance;
import com.taobao.weex.WXSDKManager;
import com.taobao.weex.common.WXDomPropConstant;
import com.taobao.weex.common.WXErrorCode;
import com.taobao.weex.dom.flex.CSSLayoutContext;
import com.taobao.weex.dom.flex.CSSNode;
import com.taobao.weex.dom.flex.Spacing;
import com.taobao.weex.ui.IWXRenderTask;
import com.taobao.weex.ui.WXRenderManager;
import com.taobao.weex.ui.component.WXComponent;
import com.taobao.weex.ui.component.WXVContainer;
import com.taobao.weex.utils.WXConst;
import com.taobao.weex.utils.WXLogUtils;
import com.taobao.weex.utils.WXViewUtils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * <p>
 * This class is responsible for creating command object of DOM operation and
 * invoking command of corresponding object.
 * </p>
 * <p>
 * In the command design pattern,
 * this class acts as the <strong>invoker </strong>in the command pattern
 * despite that it is also responsible for creating <strong>Command</strong> object.
 * And,{@link IWXRenderTask} works as the <strong>Command</strong>
 * {@link WXDomManager} works as the <strong>Client</strong>
 * {@link WXRenderManager} works as the <strong>Receiver</strong>.
 * </p>
 * <p>
 * There exists one to one correspondence between WXDomStatement and WXInstance,
 * and {@link WXDomManager} is responsible for manage the relation of correspondence.
 * </p>
 */
class WXDomStatement {

  private final ConcurrentHashMap<String, WXDomObject> mRegistry;
  private String mInstanceId;
  private WXRenderManager mWXRenderManager;
  private ArrayList<IWXRenderTask> mNormalTasks;
  private Set<String> mUpdate;
  private CSSLayoutContext mLayoutContext;
  private volatile boolean mDirty;
  private boolean mDestroy;
  private Map<String, AddDomInfo> mAddDom = new HashMap<>();

  /**
   * Create an instance of {@link WXDomStatement},
   * One {@link WXSDKInstance} corresponding to one and only one {@link WXDomStatement}.
   * And all the instance of {@link WXDomManager} share the same {@link WXRenderManager}.
   * @param instanceId the id of the {@link WXSDKInstance}.
   *                   One {@link WXSDKInstance} corresponding to one {@link WXDomStatement},
   *                   and vice versa.
   * @param renderManager This acts as the Receiver of the command pattern
   */
  public WXDomStatement(String instanceId, WXRenderManager renderManager) {
    mDestroy = false;
    mInstanceId = instanceId;
    mLayoutContext = new CSSLayoutContext();
    mRegistry = new ConcurrentHashMap<>();
    mNormalTasks = new ArrayList<>();
    mUpdate = new HashSet<>();
    mWXRenderManager = renderManager;
  }

  /**
   * Put the map info in the JSONObject to the container.
   * This method check for null value in the JSONObject
   * and won't put the null value in the container.
   * As {@link ConcurrentHashMap#putAll(Map)} will throws an exception if the key or value to
   * be put is null, it is necessary to invoke this method as replacement of
   * {@link Map#putAll(Map)}
   * @param container container to contain the JSONObject.
   * @param rawValue jsonObject, contains map info.
   */
  private static void putAll(Map<String, Object> container, JSONObject rawValue) {
    String key;
    Object value;
    for (Map.Entry<String, Object> entry : rawValue.entrySet()) {
      key = entry.getKey();
      value = entry.getValue();
      if (key != null && value != null) {
        container.put(key, value);
      }
    }
  }

  /**
   * Destroy current instance, which occurred when {@link WXSDKInstance#destroy()} is called.
   */
  public void destroy() {
    mDestroy = true;
    mRegistry.clear();
  }

  /**
   * Rebuild the component tree.
   * The purpose of this method is moving fixed components to the root component.
   * This method will be called when {@link #batch()} is executed.
   * @param root root dom
   */
  void rebuildingDomTree(WXDomObject root) {
    if (root != null && root.getFixedStyleRefs() != null) {
      int size = root.getFixedStyleRefs().size();
      for (int i = 0; i < size; i++) {
        String fixedRef = root.getFixedStyleRefs().get(i);
        WXDomObject wxDomObject = mRegistry.get(fixedRef);
        if (wxDomObject!=null && wxDomObject.parent != null) {
          wxDomObject.parent.remove(wxDomObject);
          root.add(wxDomObject, -1);
        }
      }
    }

  }

  /**
   * Batch the execution of command objects and execute all the command objects created other
   * places, e.g. call {@link IWXRenderTask#execute()}.
   * First, it will rebuild the dom tree and do pre layout staff.
   * Then call {@link com.taobao.weex.dom.flex.CSSNode#calculateLayout(CSSLayoutContext)} to
   * start calculate layout.
   * Next, call {@link #applyUpdate(WXDomObject)} to get changed dom and creating
   * corresponding command object.
   * Finally, walk through the queue, e.g. call {@link IWXRenderTask#execute()} for every task
   * in the queue.
   */
  void batch() {
    long start0 = System.currentTimeMillis();

    if (!mDirty || mDestroy) {
      return;
    }

    WXDomObject rootDom = mRegistry.get(WXDomObject.ROOT);
    if (rootDom == null) {
      return;
    }

    rebuildingDomTree(rootDom);

    layoutBefore(rootDom);
    long start = System.currentTimeMillis();


    rootDom.calculateLayout(mLayoutContext);

    if(WXSDKManager.getInstance().getSDKInstance(mInstanceId)!=null) {
      WXSDKManager.getInstance().getSDKInstance(mInstanceId).cssLayoutTime(System.currentTimeMillis() - start);
    }

    //		if (WXEnvironment.isApkDebugable()) {
    //			WXLogUtils.d("csslayout", "------------start------------");
    //			WXLogUtils.d("csslayout", rootDom.toString());
    //			WXLogUtils.d("csslayout", "------------end------------");
    //		}


    layoutAfter(rootDom);

    start = System.currentTimeMillis();
    applyUpdate(rootDom);
    if(WXSDKManager.getInstance().getSDKInstance(mInstanceId)!=null) {
      WXSDKManager.getInstance().getSDKInstance(mInstanceId).applyUpdateTime(System.currentTimeMillis() - start);
    }

    start = System.currentTimeMillis();
    updateDomObj();
    if(WXSDKManager.getInstance().getSDKInstance(mInstanceId)!=null) {
      WXSDKManager.getInstance().getSDKInstance(mInstanceId).updateDomObjTime(System.currentTimeMillis() - start);
    }

    int count = mNormalTasks.size();
    for (int i = 0; i < count && !mDestroy; ++i) {
      mWXRenderManager.runOnThread(mInstanceId, mNormalTasks.get(i));
    }
    mNormalTasks.clear();
    mAddDom.clear();
    mUpdate.clear();
    mDirty = false;
    if(WXSDKManager.getInstance().getSDKInstance(mInstanceId)!=null) {
      WXSDKManager.getInstance().getSDKInstance(mInstanceId).batchTime(System.currentTimeMillis() - start0);
    }

  }

  /**
   * Calling given dom and its children's {@link WXDomObject#layoutBefore()}
   * @param dom the root domObject for recursive call
   */
  private void layoutBefore(WXDomObject dom) {
    if (dom == null || !dom.hasUpdate() || mDestroy) {
      return;
    }
    dom.layoutBefore();
    int count = dom.childCount();
    for (int i = 0; i < count; ++i) {
      layoutBefore(dom.getChild(i));
    }
  }

  private void layoutAfter(WXDomObject dom){
    if (dom == null || !dom.hasUpdate() || mDestroy) {
      return;
    }
    dom.layoutAfter();
    int count = dom.childCount();
    for (int i = 0; i < count; ++i) {
      layoutAfter(dom.getChild(i));
    }
  }

  /**
   * Walk through the dom tree and create command object of re-calculating
   * {@link android.view.ViewGroup.LayoutParams} for dom that is old.
   * @param dom the root dom of the walk through.
   */
  private void applyUpdate(WXDomObject dom) {
    if (dom == null) {
      return;
    }
    if (dom.hasUpdate()) {
      dom.markUpdateSeen();
      mUpdate.add(dom.ref);
      if (!dom.isYoung()) {
        final WXDomObject copy = dom.clone();
        if (copy == null) {
          return;
        }
        mNormalTasks.add(new IWXRenderTask() {

          @Override
          public void execute() {
            mWXRenderManager.setLayout(mInstanceId, copy.ref, copy);
          }
        });
        if (dom.getExtra() != null) {
          mNormalTasks.add(new IWXRenderTask() {

            @Override
            public void execute() {
              mWXRenderManager.setExtra(mInstanceId, copy.ref, copy.getExtra());
            }
          });
        }
      }
    }
    int count = dom.childCount();
    for (int i = 0; i < count; ++i) {
      applyUpdate(dom.getChild(i));
    }
  }

  /**
   * Create command object for creating body according to the JSONObject. And put the command
   * object in the queue.
   * @param element the jsonObject according to which to create command object.
   */
  void createBody(JSONObject element) {
    if (mDestroy) {
      return;
    }
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    if (element == null) {
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_CREATEBODY);
      }
      return;
    }

    WXDomObject domObject = parseInner(element);
    if(domObject==null){
      return;
    }
    Map<String, Object> style = new HashMap<>(5);
    if (domObject.style == null || !domObject.style.containsKey(WXDomPropConstant.WX_FLEXDIRECTION)) {
      style.put(WXDomPropConstant.WX_FLEXDIRECTION, "column");
    }
    if (domObject.style == null || !domObject.style.containsKey(WXDomPropConstant.WX_BACKGROUNDCOLOR)) {
      style.put(WXDomPropConstant.WX_BACKGROUNDCOLOR, "#ffffff");
    }
    //If there is height or width in JS, then that value will override value here.
    if (domObject.style == null || !domObject.style.containsKey(WXDomPropConstant.WX_WIDTH)) {
      style.put(WXDomPropConstant.WX_WIDTH, WXViewUtils.getWebPxByWidth(WXViewUtils.getWeexWidth(mInstanceId)));
    }
    if (domObject.style == null || !domObject.style.containsKey(WXDomPropConstant.WX_HEIGHT)) {
      style.put(WXDomPropConstant.WX_HEIGHT, WXViewUtils.getWebPxByWidth(WXViewUtils.getWeexHeight(mInstanceId)));
    }
    domObject.ref = WXDomObject.ROOT;
    domObject.updateStyle(style);
    transformStyle(domObject, true);

    try {
      final WXComponent component = mWXRenderManager.createBodyOnDomThread(mInstanceId, domObject);
      AddDomInfo addDomInfo = new AddDomInfo();
      addDomInfo.component = component;
      mAddDom.put(domObject.ref, addDomInfo);

      mNormalTasks.add(new IWXRenderTask() {

        @Override
        public void execute() {
          WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
          if (instance == null || instance.getContext() == null) {
            WXLogUtils.e("instance is null or instance is destroy!");
            return;
          }
          try {
            mWXRenderManager.createBody(mInstanceId, component);
          } catch (Exception e) {
            WXLogUtils.e("create body failed." + e.getMessage());
          }
        }
      });
      mDirty = true;

      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
      }
    }catch (Exception e){

      WXLogUtils.e("create body in dom thread failed." + e.getMessage());
    }
  }

  /**
   * Update all components' dom info stored in {@link #mAddDom}
   */
  private void updateDomObj() {
    long start = System.currentTimeMillis();
    Iterator<Map.Entry<String, AddDomInfo>> iterator = mAddDom.entrySet().iterator();
    Map.Entry<String, AddDomInfo> entry;
    AddDomInfo value;
    while (iterator.hasNext()) {
      entry = iterator.next();
      value = entry.getValue();
      updateDomObj(value.component);
    }
    if (WXEnvironment.isApkDebugable()) {
      WXLogUtils.d("updateDomObj", "time:" + (System.currentTimeMillis() - start));
    }
  }

  /**
   * Update the specified component's dom and mark it as old.
   * @param component the component to be updated
   */
  private void updateDomObj(WXComponent component) {
    if (component == null) {
      return;
    }
    WXDomObject domObject = mRegistry.get(component.getRef());
    if (domObject == null) {
      return;
    }
    domObject.old();
    component.updateDom(domObject.clone());
    if (component instanceof WXVContainer) {
      WXVContainer container = (WXVContainer) component;
      int count = container.childCount();
      for (int i = 0; i < count; ++i) {
        updateDomObj(container.getChild(i));
      }
    }
  }

  /**
   * Create a command object for adding a dom node to its parent in a specific location.
   * If dom's parent doesn't exist or the dom has been added in current {@link WXSDKInstance},
   * this method will return.
   * If the above request is met, then put the command object in the queue.
   * @param dom the dom object in the form of JSONObject
   * @param parentRef parent to which the dom is added.
   * @param index the location of which the dom is added.
   */
  void addDom(JSONObject dom, final String parentRef, final int index) {
    if (mDestroy) {
      return;
    }
    WXDomObject parent = mRegistry.get(parentRef);
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);

    if (parent == null) {
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_ADDELEMENT);
      }
      return;
    }
    WXDomObject domObject = parseInner(dom);

    if (domObject == null || mRegistry.containsKey(domObject.ref)) {
      if (WXEnvironment.isApkDebugable()) {
        WXLogUtils.e("[WXDomStatement] addDom error!!");
      }
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_ADDELEMENT);
      }
      return;
    }

    transformStyle(domObject, true);

    if (domObject.isFixed()) {
      WXDomObject rootDom = mRegistry.get(WXDomObject.ROOT);
      if (rootDom == null) {
        return;
      }
      rootDom.add2FixedDomList(domObject.ref);

    }
    parent.add(domObject, index);

    //Create component in dom thread
    final WXComponent component = mWXRenderManager.createComponentOnDomThread(mInstanceId, domObject, parentRef, index);
    AddDomInfo addDomInfo = new AddDomInfo();
    addDomInfo.component = component;
    mAddDom.put(domObject.ref, addDomInfo);

    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
        if(instance == null || instance.getContext()== null) {
          WXLogUtils.e("instance is null or instance is destroy!");
          return;
        }
        try {
          mWXRenderManager.addComponent(mInstanceId, component, parentRef, index);
        }catch (Exception e){
          e.printStackTrace();
          WXLogUtils.e("add component failed."+e.getMessage());
        }
      }
    });

    mDirty = true;

    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Create a command object for moving the specific {@link WXDomObject} to a new parent.
   * If any of the following situation is met,
   * <ul>
   * <li> dom to be moved is null </li>
   * <li> dom's parent is null </li>
   * <li> new parent is null </li>
   * <li> parent is under {@link CSSNode#hasNewLayout()} </li>
   * </ul>
   * this method will return. Otherwise, put the command object in the queue.
   * @param ref {@link WXDomObject#ref} of the dom to be moved.
   * @param parentRef {@link WXDomObject#ref} of the new parent DOM node
   * @param index the index of the dom to be inserted in the new parent.
   */
  void moveDom(final String ref, final String parentRef, final int index) {
    if (mDestroy) {
      return;
    }
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    WXDomObject domObject = mRegistry.get(ref);
    WXDomObject parentObject = mRegistry.get(parentRef);
    if (domObject == null || domObject.parent == null
        || parentObject == null || parentObject.hasNewLayout()) {
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_MOVEELEMENT);
      }
      return;
    }
    domObject.parent.remove(domObject);
    parentObject.add(domObject, index);

    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        mWXRenderManager.moveComponent(mInstanceId, ref, parentRef, index);
      }
    });

    mDirty = true;
    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Create a command object for removing the specified {@link WXDomObject}.
   * If the domObject is null or its parent is null, this method returns directly.
   * Otherwise, put the command object in the queue.
   * @param ref {@link WXDomObject#ref} of the dom.
   */
  void removeDom(final String ref) {
    if (mDestroy) {
      return;
    }
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    WXDomObject domObject = mRegistry.get(ref);
    if (domObject == null) {
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_REMOVEELEMENT);
      }
      return;
    }
    WXDomObject parent = domObject.parent;
    if (parent == null) {
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_REMOVEELEMENT);
      }
      return;
    }
    clearRegistryForDom(domObject);
    parent.remove(domObject);

    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        mWXRenderManager.removeComponent(mInstanceId, ref);
      }
    });

    mDirty = true;
    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Clear the mapping relationship between {@link WXDomObject#ref} and {@link WXDomObject}.
   * The mapping info is stored in {@link #mRegistry}.
   * @param domObject
   */
  private void clearRegistryForDom(WXDomObject domObject) {
    int count = domObject.childCount();
    mRegistry.remove(domObject.ref);
    for (int i = count - 1; i >= 0; --i) {
      clearRegistryForDom(domObject.getChild(i));
    }
  }

  /**
   * Update the {@link WXDomObject#attr} according to the given attribute. Then creating a
   * command object for updating corresponding view and put the command object in the queue.
   * @param ref {@link WXDomObject#ref} of the dom.
   * @param attrs the new style. This style is only a part of the full attribute set, and will be
   *              merged into {@link WXDomObject#attr}
   * @see #updateStyle(String, JSONObject)
   */
  void updateAttrs(String ref, final JSONObject attrs) {
    if (mDestroy) {
      return;
    }
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    final WXDomObject domObject = mRegistry.get(ref);
    if (domObject == null) {
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_UPDATEATTRS);
      }
      return;
    }

    domObject.updateAttr(attrs);

    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        mWXRenderManager.updateAttrs(mInstanceId, domObject.ref, attrs);
      }
    });
    mDirty = true;

    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Update the {@link WXDomObject#style} according to the given style. Then creating a
   * command object for updating corresponding view and put the command object in the queue.
   * @param ref {@link WXDomObject#ref} of the dom.
   * @param style the new style. This style is only a part of the full style, and will be merged
   *              into {@link WXDomObject#style}
   * @see #updateAttrs(String, JSONObject)
   */
  void updateStyle(String ref, JSONObject style) {
    if (mDestroy) {
      return;
    }
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    WXDomObject domObject = mRegistry.get(ref);
    if (domObject == null) {
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_UPDATESTYLE);
      }
      return;
    }

    domObject.updateStyle(style);
    transformStyle(domObject, false);

    updateStyle(domObject, style);
    mDirty = true;

    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Create the command object for updating style and put it the queue. If the given style
   * contains border-width and padding that will affect layout, then a command object for reset
   * padding will also be created.
   * @param domObject the given dom object
   * @param update the given style.
   */
  private void updateStyle(final WXDomObject domObject, final Map<String, Object> update) {
    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        mWXRenderManager.updateStyle(mInstanceId, domObject.ref, update);
      }
    });
    if (update.containsKey("padding") || update.containsKey("paddingTop") ||
        update.containsKey("paddingLeft") ||
        update.containsKey("paddingRight") ||
        update.containsKey("paddingBottom") || update.containsKey("borderWidth")) {
      mNormalTasks.add(new IWXRenderTask() {

        @Override
        public void execute() {
          Spacing padding = domObject.getPadding();
          Spacing border = domObject.getBorder();
          mWXRenderManager.setPadding(mInstanceId, domObject.ref, padding, border);
        }
      });
    }
  }

  /**
   * Create a command object for adding a default event listener to the corresponding {@link
   * WXDomObject} and put the command object in the queue.
   * When the event is triggered, the eventListener will call {@link WXSDKManager#fireEvent
   * (String, String, String)}, and the JS will handle all the operations from there.
   *
   * @param ref {@link WXDomObject#ref} of the dom.
   * @param type the type of the event, this may be a plain event defined in
   * {@link com.taobao.weex.ui.component.WXEventType} or a gesture defined in {@link com.taobao
   * .weex.ui.view.gesture.WXGestureType}
   */
  void addEvent(final String ref, final String type) {
    if (mDestroy) {
      return;
    }
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    WXDomObject domObject = mRegistry.get(ref);
    if (domObject == null) {
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_ADDEVENT);
      }
      return;
    }
    domObject.addEvent(type);
    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        mWXRenderManager.addEvent(mInstanceId, ref, type);
      }
    });

    mDirty = true;
    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Create a command object for removing the event listener of the corresponding {@link
   * WXDomObject} and put the command event in the queue.
   * @param ref {@link WXDomObject#ref} of the dom.
   * @param type the type of the event, this may be a plain event defined in
   * {@link com.taobao.weex.ui.component.WXEventType} or a gesture defined in {@link com.taobao
   * .weex.ui.view.gesture.WXGestureType}
   */
  void removeEvent(final String ref, final String type) {
    if (mDestroy) {
      return;
    }
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    WXDomObject domObject = mRegistry.get(ref);
    if (domObject == null) {
      if (instance != null) {
        instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_ERR_DOM_REMOVEEVENT);
      }
      return;
    }
    domObject.removeEvent(type);
    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        mWXRenderManager.removeEvent(mInstanceId, ref, type);
      }
    });

    mDirty = true;
    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Create a command object for scroll the given view to the specified position.
   * @param ref {@link WXDomObject#ref} of the dom.
   * @param options the specified position
   */
  void scrollToDom(final String ref, final JSONObject options) {
    if (mDestroy) {
      return;
    }
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);

    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        mWXRenderManager.scrollToComponent(mInstanceId, ref, options);
      }
    });

    mDirty = true;
    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Create a command object for notifying {@link WXRenderManager} that the process of creating
   * given view is finished, and put the command object in the queue.
   */
  void createFinish() {
    if (mDestroy) {
      return;
    }

    final WXDomObject root = mRegistry.get(WXDomObject.ROOT);
    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        mWXRenderManager.createFinish(mInstanceId,
                                      (int) root.getLayoutWidth(),
                                      (int) root.getLayoutHeight());
      }
    });

    mDirty = true;
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Create a command object for notifying {@link WXRenderManager} that the process of refreshing
   * given view is finished, and put the command object in the queue.
   */
  void refreshFinish() {
    if (mDestroy) {
      return;
    }
    final WXDomObject root = mRegistry.get(WXDomObject.ROOT);
    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        int realWidth = (int) root.getLayoutWidth();
        int realHeight = (int) root.getLayoutHeight();
        mWXRenderManager.refreshFinish(mInstanceId, realWidth, realHeight);
      }
    });

    mDirty = true;
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }

  /**
   * Parse the jsonObject to {@link WXDomObject} recursively
   * @param map the original JSONObject
   * @return Dom Object corresponding to the JSONObject.
   */
  private WXDomObject parseInner(JSONObject map) {
    if (map == null || map.size() <= 0) {
      return null;
    }

    String type = (String) map.get("type");
    WXDomObject domObject = WXDomObjectFactory.newInstance(type);

    if(domObject==null){
      return null;
    }

    domObject.type = type;
    domObject.ref = (String) map.get("ref");
    Object style = map.get("style");
    if (style != null && style instanceof JSONObject) {
      domObject.style = new WXStyle();
      putAll(domObject.style, (JSONObject) style);
    }
    Object attr = map.get("attr");
    if (attr != null && attr instanceof JSONObject) {
      domObject.attr = new WXAttr();
      putAll(domObject.attr, (JSONObject) attr);
    }
    Object event = map.get("event");
    if (event != null && event instanceof JSONArray) {
      domObject.event = new WXEvent();
      JSONArray eventArray = (JSONArray) event;
      int count = eventArray.size();
      for (int i = 0; i < count; ++i) {
        domObject.event.add(eventArray.getString(i));
      }
    }
    Object children = map.get("children");
    if (children != null && children instanceof JSONArray) {
      domObject.children = new ArrayList<>();
      JSONArray childrenArray = (JSONArray) children;
      int count = childrenArray.size();
      for (int i = 0; i < count; ++i) {
        domObject.children.add(parseInner(childrenArray.getJSONObject(i)));
      }
    }

    return domObject;
  }

  /**
   * Create a command object for notifying {@link WXRenderManager} that the process of update
   * given view is finished, and put the command object in the queue.
   */
  void updateFinish() {
    if (mDestroy) {
      return;
    }
    mNormalTasks.add(new IWXRenderTask() {

      @Override
      public void execute() {
        mWXRenderManager.updateFinish(mInstanceId);
      }
    });

    mDirty = true;
    WXSDKInstance instance = WXSDKManager.getInstance().getSDKInstance(mInstanceId);
    if (instance != null) {
      instance.commitUTStab(WXConst.DOM_MODULE, WXErrorCode.WX_SUCCESS);
    }
  }


  /**
   * Creating the mapping between {@link WXDomObject#ref} to {@link WXDomObject}
   * and store the mapping in {@link #mRegistry}.
   * Then, parse and copy style
   * from {@link WXDomObject#style} to {@link com.taobao.weex.dom.flex.CSSNode}.
   * Finally, {@link WXDomObject#children} is also added to
   * {@link com.taobao.weex.dom.flex.CSSNode#mChildren} if added is true.
   * The above procedure will be done recursively.
   * @param dom the original DOM Object
   * @param isAdd true for adding children of
   * {@link WXDomObject} {@link com.taobao.weex.dom.flex.CSSNode#mChildren} and parsing style,
   *              false for only parsing style.
   */
  private void transformStyle(WXDomObject dom, boolean isAdd) {
    if (dom == null) {
      return;
    }

    if (isAdd) {
      dom.young();
      mRegistry.put(dom.ref, dom);
    }

    if (dom.style != null && dom.style.size() > 0) {
      CSSTransformFromStyle.transformStyle(dom);
    }

    int count = dom.childCount();
    WXDomObject child;
    for (int i = 0; i < count; ++i) {
      child = dom.getChild(i);
      if (isAdd) {
        dom.add2Dom(child, i);
      }
      transformStyle(child, isAdd);
    }
  }

  static class AddDomInfo {

    public WXComponent component;
  }
}