package com.creamtec.ajaxswing.examples;

import java.awt.Component;
import java.awt.Window;

import com.creamtec.ajaxswing.core.ActionData;
import com.creamtec.ajaxswing.core.HttpRequestData;
import com.creamtec.ajaxswing.gui.ActionEmulator;
import com.creamtec.ajaxswing.gui.ComponentUpdater;
import com.creamtec.ajaxswing.gui.WindowUpdater;
import com.creamtec.ajaxswing.rendering.ComponentRenderer;
import com.creamtec.ajaxswing.rendering.Document;
import com.creamtec.ajaxswing.rendering.html.HTMLPage;
import com.creamtec.ajaxswing.ui.CustomControl;
import com.creamtec.ajaxswing.ui.FixedDialog;
import com.creamtec.core.TraceMgr;

/**
 * Example of implementing a custom renderer, custom updater and action emulator
 * See AjaxSwing documentation and javadoc for more information.
 */
public class CustomControlProcessor implements ComponentRenderer, ComponentUpdater, ActionEmulator
{

    public CustomControlProcessor()
    {
        TraceMgr.trace(this, "Loaded");
    }


    public void renderComponent (Document document, Object component) throws Exception
    {
        TraceMgr.trace(this, "Rendering custom control");
        CustomControl control = (CustomControl)component;
        HTMLPage page = (HTMLPage)document;

        // Because custom control contains other elements, it is rendered as a div for proper children positioning and AJAX updates
        page.append("<div id=\"");
        page.append(page.getComponentName(control));
        page.append("\"");
        page.getPageRenderer().appendComponentStyle(page, control, false);
        page.appendln(">");

        // Delegate rendering of checkbox to AjaxSwing engine for simplicity
        page.getPageRenderer().renderComponent(page, control.getCheckBox());

        // Render text ourselves because we want to support 3D effect
        if (control.is3D()) {
            // Only draw the shadow if we need 3D look
            page.append("<span");
            page.append(" style=\"position:absolute;left:");
            page.append(control.getTextOffset() + 1);
            page.append("px;top:6px;white-space:nowrap;color:#d0d0d0\">");
            page.append(control.getText());
            page.appendln("</span>");
        }

        // Always display text using main color
        page.append("<span");
        page.append(" style=\"position:absolute;left:");
        page.append(control.getTextOffset());
        page.append("px;top:5px;white-space:nowrap;color:black\">");
        page.append(control.getText());
        page.appendln("</span>");
        
        // Use JavaScript for things we can't do via HTML
        StringBuffer script = new StringBuffer();
        script.append("document.title = 'Custom Control is 3D ");
        script.append(control.is3D()? "enabled": "disabled");
        script.append("';\n");
        page.appendScript(script.toString());

        page.appendln("</div>");
    }


    /**
     * Called by AjaxSwing to apply the data from HTML page to the GUI component
     */
    public boolean updateComponent (Component comp, HttpRequestData data, ActionData actionData) throws Exception
    {
        CustomControl control = (CustomControl)comp;
        String checkBoxName = WindowUpdater.getComponentName(control.getCheckBox());
        Object value = data.getParams().get(checkBoxName);
        boolean isSelected = value != null;
        TraceMgr.trace(this, "updateComponent for custom control, new state = " + (isSelected? "selected":"not selected"));

        // Only change the checkbox state when needed
        if (control.getCheckBox().isSelected() != isSelected) {
            control.getCheckBox().doClick(0);
        }

        // If the page submit was triggered by an event from our checkbox, mark
        // the action as processed because otherwise AjaxSwing would try to find
        // the event component, update it with data and then process the action.
        // Since we did the rendering of the checkbox ourselves, we have to take care of
        // its events and actions
        if (actionData.getActionString().equals("/event/" + checkBoxName))
            actionData.setProcessed(true);

        return false;
    }


    /**
     * Called by AjaxSwing to emulate a standard or custom action
     */
    public boolean emulateAction(Document document, ActionData actionData) throws Exception {
    	HTMLPage page = (HTMLPage) document;
        TraceMgr.trace(this, "emulateAction called for page " + page.getTitle());
        if (actionData.getActionString().equals("close")) {
            TraceMgr.trace("Intercepted Close window attempt");
            Window window = page.getClientAgent().getUIManager().getWindowInFocus();
            if (window instanceof FixedDialog) {
                FixedDialog dlg = (FixedDialog)window;
                dlg.setTitle("Intercepted Close action");

                // Mark action as processed and stop emulation
                actionData.setProcessed(true);
                return true;
            }
        }

        return false;       // Keep going
    }


    public void postUpdateComponent(Component comp, HttpRequestData data, ActionData actionData) {
    }


	public void initializaDocument(Document document) {
	}


}