/**
 * 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.io.Writer;

import org.exoplatform.commons.serialization.api.annotations.Serialized;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;
import org.exoplatform.web.application.AbstractApplicationMessage;
import org.exoplatform.web.application.ApplicationMessage;
import org.exoplatform.webui.application.WebuiRequestContext;
import org.exoplatform.webui.exception.CSRFException;
import org.exoplatform.webui.exception.MessageException;

/**
 * This is abstract class for Root WebUI component of applications in GateIn. <br>
 * Act as container of WebUI components, it also provide method to show a Popup message
 */
@Serialized
public abstract class UIApplication extends UIContainer {

    protected static Log log = ExoLogger.getLogger("portal:UIApplication");

    private String owner;

    private long lastAccessApplication_;

    private UIPopupMessages uiPopupMessages_;
    private static final String UIAPPLICATION = "uiapplication";

    public UIApplication() {
    }

    // TODO this looks like not to be used anymore
    public String getOwner() {
        return owner;
    }

    // TODO this looks like not to be used anymore
    public void setOwner(String s) {
        owner = s;
    }

    /**
     * Return the common UIPopupMessages
     *
     * @return UIPopupMessages
     */
    public UIPopupMessages getUIPopupMessages() {
        if (USE_WEBUI_RESOURCES && uiPopupMessages_ == null) {
            try {
                uiPopupMessages_ = createUIComponent(UIPopupMessages.class, null, null);
                uiPopupMessages_.setId("_" + uiPopupMessages_.hashCode());
            } catch (Exception e) {
                log.error(e.getMessage(), e);
            }
        }
        return uiPopupMessages_;
    }

    public void addMessage(AbstractApplicationMessage message) {
      if (USE_WEBUI_RESOURCES) {
        getUIPopupMessages().addMessage(message);
      }
    }

    public void addMessage(ApplicationMessage message) {
      if (USE_WEBUI_RESOURCES) {
        addMessage((AbstractApplicationMessage) message);
      }
    }

    public void clearMessages() {
      if (USE_WEBUI_RESOURCES) {
        getUIPopupMessages().clearMessages();
      }
    }

    public long getLastAccessApplication() {
        return lastAccessApplication_;
    }

    public void setLastAccessApplication(long time) {
        lastAccessApplication_ = time;
    }

    public String getUIComponentName() {
        return UIAPPLICATION;
    }

    @SuppressWarnings("unchecked")
    public <T extends UIComponent> T findComponentById(String lookupId) {
        if (USE_WEBUI_RESOURCES && getUIPopupMessages().getId().equals(lookupId))
            return (T) getUIPopupMessages();
        return (T) super.findComponentById(lookupId);
    }

    public void renderChildren() throws Exception {
        super.renderChildren();
        if (!USE_WEBUI_RESOURCES || getUIPopupMessages() == null) {
            return;
        }
        WebuiRequestContext context = WebuiRequestContext.getCurrentInstance();
        getUIPopupMessages().processRender(context);
    }

    /**
     * Wrap the action processing by a try catch, if there is exceptions, show a popup message
     * if no exception the processAction will be delegate to the target of the action request
     */
    public void processAction(WebuiRequestContext context) throws Exception {
        try {
            super.processAction(context);
        } catch (MessageException ex) {
            addMessage(ex.getDetailMessage());
        } catch (CSRFException e) {
            context.getJavascriptManager().getRequireJS().addScripts("location.reload();");
        } catch (Throwable t) {
            ApplicationMessage msg = new ApplicationMessage("UIApplication.msg.unknown-error", null, ApplicationMessage.ERROR);
            addMessage(msg);
            log.error("Error during the processAction phase", t);
        }
    }

    /**
     * Triggered when there is Ajax request. <br>
     * This method add xml structure that help PortalHttpRequest.js parse the response
     */
    public void renderBlockToUpdate(UIComponent uicomponent, WebuiRequestContext context, Writer w) throws Exception {
        w.write("<div class=\"BlockToUpdate\">");
        w.append("<div class=\"BlockToUpdateId\">").append(uicomponent.getId()).append("</div>");
        w.write("<div class=\"BlockToUpdateData\">");
        uicomponent.processRender(context);
        w.write("</div>");
        w.write("</div>");
    }
}
