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// FormRenderer.java

package com.sun.faces.renderkit.html_basic;

import java.io.IOException;
import java.util.ListIterator;
import java.util.Map;
import java.util.logging.Level;

import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
import javax.faces.component.UIViewRoot;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

import com.sun.faces.config.WebConfiguration;
import com.sun.faces.config.WebConfiguration.BooleanWebContextInitParameter;
import com.sun.faces.renderkit.Attribute;
import com.sun.faces.renderkit.AttributeManager;
import com.sun.faces.renderkit.RenderKitUtils;
import javax.faces.render.Renderer;

/** FormRenderer is a class that renders a UIForm as a Form. */

public class FormRenderer extends HtmlBasicRenderer {

    private static final Attribute[] ATTRIBUTES =
          AttributeManager.getAttributes(AttributeManager.Key.FORMFORM);

    private boolean writeStateAtEnd;

    // ------------------------------------------------------------ Constructors


    public FormRenderer() {
        WebConfiguration webConfig = WebConfiguration.getInstance();
        writeStateAtEnd =
             webConfig.isOptionEnabled(
                  BooleanWebContextInitParameter.WriteStateAtFormEnd);
    }

    // ---------------------------------------------------------- Public Methods


    @Override
    public void decode(FacesContext context, UIComponent component) {

        rendererParamsNotNull(context, component);

        String clientId = decodeBehaviors(context, component);

        if (clientId == null) {
            clientId = component.getClientId(context);
        }
                
        // Was our form the one that was submitted?  If so, we need to set
        // the indicator accordingly..
        Map requestParameterMap = context.getExternalContext()
              .getRequestParameterMap();
        if (requestParameterMap.containsKey(clientId)) {
            if (logger.isLoggable(Level.FINE)) {
                logger.log(Level.FINE,
                           "UIForm with client ID {0}, submitted",
                           clientId);
            }
            ((UIForm) component).setSubmitted(true);
        } else {
            ((UIForm) component).setSubmitted(false);
        }

    }


    @Override
    public void encodeBegin(FacesContext context, UIComponent component)
          throws IOException {

        rendererParamsNotNull(context, component);

        if (!shouldEncode(component)) {
            return;
        }

        ResponseWriter writer = context.getResponseWriter();
        assert(writer != null);
        String clientId = component.getClientId(context);
        // since method and action are rendered here they are not added
        // to the pass through attributes in Util class.
        writer.write('\n');
        writer.startElement("form", component);
        writer.writeAttribute("id", clientId, "clientId");
        writer.writeAttribute("name", clientId, "name");
        writer.writeAttribute("method", "post", null);
        writer.writeAttribute("action", getActionStr(context), null);
        String styleClass =
              (String) component.getAttributes().get("styleClass");
        if (styleClass != null) {
            writer.writeAttribute("class", styleClass, "styleClass");
        }
        String acceptcharset = (String)
              component.getAttributes().get("acceptcharset");
        if (acceptcharset != null) {
            writer.writeAttribute("accept-charset", acceptcharset,
                                  "acceptcharset");
        }

        RenderKitUtils.renderPassThruAttributes(context,
                                                writer,
                                                component,
                                                ATTRIBUTES);
        writer.writeText("\n", component, null);

        // this hidden field will be checked in the decode method to
        // determine if this form has been submitted.         
        writer.startElement("input", component);
        writer.writeAttribute("type", "hidden", "type");
        writer.writeAttribute("name", clientId,
                              "clientId");
        writer.writeAttribute("value", clientId, "value");
        writer.endElement("input");
        writer.write('\n');

        // Write out special hhidden field for partial submits
        String viewId = context.getViewRoot().getViewId();
        String actionURL =
            context.getApplication().getViewHandler().getActionURL(context, viewId);
        ExternalContext externalContext = context.getExternalContext();
        String encodedActionURL = externalContext.encodeActionURL(actionURL);
        String encodedPartialActionURL = externalContext.encodePartialActionURL(actionURL);
        if (encodedPartialActionURL != null) {
            if (!encodedPartialActionURL.equals(encodedActionURL)) {
                writer.startElement("input", component);
                writer.writeAttribute("type", "hidden", "type");
                writer.writeAttribute("name", "javax.faces.encodedURL", null);
                writer.writeAttribute("value", encodedPartialActionURL, "value");
                writer.endElement("input");
                writer.write('\n');
            }
        }

        if (!writeStateAtEnd) {
            context.getApplication().getViewHandler().writeState(context);
            writer.write('\n');
        }
    }


    @Override
    public void encodeEnd(FacesContext context, UIComponent component)
          throws IOException {

        rendererParamsNotNull(context, component);
        if (!shouldEncode(component)) {
            return;
        }

        // Render the end tag for form
        ResponseWriter writer = context.getResponseWriter();
        assert(writer != null);
        
        // Render ay resources that have been targeted for this form.

        UIViewRoot viewRoot = context.getViewRoot();
        ListIterator iter = (viewRoot.getComponentResources(context, "form")).listIterator();
        while (iter.hasNext()) {
            UIComponent resource = (UIComponent)iter.next();
            resource.encodeAll(context);
        }
        
        // Render the end tag for form
        if (writeStateAtEnd) {
            context.getApplication().getViewHandler().writeState(context);
        }
        writer.writeText("\n", component, null);
        writer.endElement("form");

    }

    // --------------------------------------------------------- Private Methods


    /**
     * @param context FacesContext for the response we are creating
     *
     * @return Return the value to be rendered as the action attribute
     *  of the form generated for this component.
     */
    private static String getActionStr(FacesContext context) {

        String viewId = context.getViewRoot().getViewId();
        String actionURL =
              context.getApplication().getViewHandler().
                    getActionURL(context, viewId);
        return (context.getExternalContext().encodeActionURL(actionURL));

    }

} // end of class FormRenderer