/**
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.webui.core;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import org.exoplatform.commons.serialization.api.annotations.Serialized;
import org.exoplatform.web.application.RequestContext;
import org.exoplatform.webui.application.WebuiApplication;
import org.exoplatform.webui.application.WebuiRequestContext;
import org.exoplatform.webui.config.annotation.ComponentConfig;
import org.exoplatform.webui.core.lifecycle.UIContainerLifecycle;
import org.exoplatform.webui.event.Event;
import org.exoplatform.webui.event.EventListener;

/** Created by The eXo Platform SAS May 7, 2006 */
@ComponentConfig(lifecycle = UIContainerLifecycle.class)
@Serialized
public class UIContainer extends UIComponent {

  private List<UIComponent> children;

  public boolean hasChildren() {
    return children != null && !children.isEmpty();
  }

  public void setChildren(List<UIComponent> ls) {
    this.children = new CopyOnWriteArrayList<>(ls);
  }

  public List<UIComponent> getChildren() {
    if (children == null) {
      children = new CopyOnWriteArrayList<>();
    }
    return children;
  }

  public void addChild(UIComponent uicomponent) {
    if (children == null) {
      children = new CopyOnWriteArrayList<>();
    }
    uicomponent.setParent(this);
    children.add(uicomponent);
  }

  public UIComponent removeChildById(String id) {
    if (children == null) {
      return null;
    }
    for (UIComponent child : children) {
      if (!id.equals(child.getId())) {
        continue;
      }
      child.setParent(null);
      children.remove(child);
      return child;
    }
    return null;
  }

  public <T extends UIComponent> T removeChild(Class<T> clazz) {
    if (children == null) {
      return null;
    }
    for (UIComponent child : children) {
      if (!clazz.isInstance(child)) {
        continue;
      }
      child.setParent(null);
      children.remove(child);
      return clazz.cast(child);
    }
    return null;
  }

  @SuppressWarnings("unchecked")
  public <T extends UIComponent> T getChildById(String id) {
    List<UIComponent> subComponents = getChildren();
    if (subComponents == null) {
      return null;
    }
    for (UIComponent child : subComponents) {
      if (id.equals(child.getId())) {
        return (T) child;
      }
    }
    return null;
  }

  @SuppressWarnings("unchecked")
  public <T extends UIComponent> T getChild(int idx) {
    List<UIComponent> subComponents = getChildren();
    if (subComponents == null) {
      return null;
    }
    if (subComponents.size() <= idx) {
      return null;
    }
    return (T) subComponents.get(idx);
  }

  public <T extends UIComponent> T getChild(Class<T> clazz) {
    List<UIComponent> subComponents = getChildren();
    if (subComponents == null) {
      return null;
    }
    for (UIComponent uichild : subComponents) {
      if (clazz.isInstance(uichild)) {
        return clazz.cast(uichild);
      }
    }
    return null;
  }

  @SuppressWarnings("unchecked")
  public <T extends UIComponent> T replaceChild(String targetChildId, UIComponent newComponent) {
    List<UIComponent> subComponents = getChildren();
    if (subComponents == null) {
      throw new IllegalStateException("Cannot  find the child : " + targetChildId);
    }
    for (int i = 0; i < subComponents.size(); i++) {
      UIComponent child = subComponents.get(i);
      if (targetChildId.equals(child.getId())) {
        child.setParent(null);
        newComponent.setParent(this);
        subComponents.set(i, newComponent);
        return (T) child;
      }
    }
    throw new IllegalStateException("Cannot  find the child : " + targetChildId);
  }

  public <T extends UIComponent> T replaceChild(String targetChildId, Class<T> type, String configId, String id)
                                                                                                                 throws Exception {
    WebuiRequestContext context = RequestContext.getCurrentInstance();
    WebuiApplication app = (WebuiApplication) context.getApplication();
    UIComponent comp = app.createUIComponent(type, configId, id, context);
    comp = replaceChild(targetChildId, comp);
    return type.cast(comp);
  }

  public <T extends UIComponent> T addChild(Class<T> type, String configId, String id) throws Exception {
    WebuiRequestContext context = RequestContext.getCurrentInstance();
    WebuiApplication app = (WebuiApplication) context.getApplication();
    T comp = app.createUIComponent(type, configId, id, context);
    addChild(comp);
    return comp;
  }

  @SuppressWarnings("unchecked")
  @Override
  public <T extends UIComponent> T findComponentById(String id) {
    List<UIComponent> subComponents = getChildren();
    if (getId() != null && getId().equals(id)) {
      return (T) this;
    }
    if (subComponents == null) {
      return null;
    }
    for (UIComponent uichild : subComponents) {
      UIComponent found = uichild.findComponentById(id);
      if (found != null) {
        return (T) found;
      }
    }
    return null;
  }

  @Override
  public <T extends UIComponent> T findFirstComponentOfType(Class<T> type) {
    List<UIComponent> subComponents = getChildren();
    return findFirstComponentOfType(type, subComponents);
  }

  public <T extends UIComponent> T findFirstComponentOfType(Class<T> type, List<UIComponent> components) {
    if (components == null) {
      return null;
    } else if (type.isInstance(this)) {
      return type.cast(this);
    } else {
      for (UIComponent uichild : components) {
        T found = uichild.findFirstComponentOfType(type);
        if (found != null) {
          return found;
        }
      }
      return null;
    }
  }

  @Override
  public <T> void findComponentOfType(List<T> list, Class<T> type) {
    List<UIComponent> subComponents = getChildren();
    if (type.isInstance(this) && !list.contains(this)) {
      list.add(type.cast(this));
    }
    if (subComponents == null) {
      return;
    }
    for (UIComponent uichild : subComponents) {
      uichild.findComponentOfType(list, type);
    }
  }

  public void setRenderedChild(String id) {
    List<UIComponent> list = getChildren();
    for (UIComponent child : list) {
      child.setRendered(child.getId().equals(id));
    }
  }

  public <T extends UIComponent> void setRenderedChild(Class<T> type) {
    List<UIComponent> list = getChildren();
    for (UIComponent child : list) {
      child.setRendered(type.isInstance(child));
    }
  }

  public void setRenderedChildrenOfTypes(Class<?>[] types) {
    List<UIComponent> list = getChildren();
    for (UIComponent child : list) {
      child.setRendered(false);
      for (Class<?> type : types) {
        if (type.isInstance(child)) {
          child.setRendered(true);
          break;
        }
      }
    }
  }

  public void renderChild(String id) throws Exception {
    renderChild(getChildById(id));
  }

  public <T extends UIComponent> void renderChild(Class<T> clazz) throws Exception {
    renderChild(getChild(clazz));
  }

  public void renderUIComponent(UIComponent uicomponent) throws Exception {
    WebuiRequestContext context = RequestContext.getCurrentInstance();
    uicomponent.processRender(context);
  }

  public void renderChild(int index) throws Exception {
    renderChild(getChild(index));
  }

  public void renderChild(UIComponent child) throws Exception {
    if (child.isRendered()) {
      WebuiRequestContext context = RequestContext.getCurrentInstance();
      child.processRender(context);
    }
  }

  public void renderChildren() throws Exception {
    WebuiRequestContext context = RequestContext.getCurrentInstance();
    renderChildren(context);
  }

  public void renderChildren(WebuiRequestContext context) throws Exception {
    for (UIComponent child : getChildren()) {
      if (child.isRendered()) {
        child.processRender(context);
      }
    }
  }

  public static class SelectTabActionListener extends EventListener<UIContainer> {
    public void execute(Event<UIContainer> event) throws Exception {
      WebuiRequestContext context = event.getRequestContext();
      UIContainer uiContainer = event.getSource();
      String renderTab = context.getRequestParameter(OBJECTID);
      if (renderTab == null) {
        return;
      }
      UIComponent uiComp = uiContainer.findComponentById(renderTab);
      if (uiComp != null) {
        for (UIComponent child : uiContainer.getChildren()) {
          child.setRendered(false);
        }
        uiComp.setRendered(true);
      }
    }
  }
}
