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package com.sun.faces.renderkit.html_basic;

import com.sun.faces.renderkit.AttributeManager;
import com.sun.faces.renderkit.Attribute;
import com.sun.faces.renderkit.RenderKitUtils;
import com.sun.faces.util.MessageUtils;
import com.sun.faces.util.Util;
import java.io.IOException;
import javax.faces.application.NavigationCase;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

public class OutcomeTargetButtonRenderer extends OutcomeTargetRenderer {

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


    // --------------------------------------------------- Methods from Renderer


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

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

        ResponseWriter writer = context.getResponseWriter();
        assert(writer != null);

        writer.startElement("input", component);
        writeIdAttributeIfNecessary(context, writer, component);

        String imageSrc = (String) component.getAttributes().get("image");
        if (imageSrc != null) {
            writer.writeAttribute("type", "image", "type");
            writer.writeURIAttribute("src", RenderKitUtils.getImageSource(context, component, "image"), "image");
        }
        else {
            writer.writeAttribute("type", "button", "type");
        }

        String label = getLabel(component);

        if (!Util.componentIsDisabled(component)) {
            NavigationCase navCase = getNavigationCase(context, component);

            if (navCase == null) {
                // QUESTION should this only be added in development mode?
                label += MessageUtils.getExceptionMessageString(MessageUtils.OUTCOME_TARGET_BUTTON_NO_MATCH);
                writer.writeAttribute("disabled", "true", "disabled");
            }
            else {
                String hrefVal = getEncodedTargetURL(context, component, navCase);
                hrefVal += getFragment(component);
                writer.writeAttribute("onclick", getOnclick(component, hrefVal), "onclick");
            }
        }

        // value should be used even for image type for accessibility (e.g., images disabled in browser)
        writer.writeAttribute("value", label, "value");

        String styleClass = (String) component.getAttributes().get("styleClass");
        if (styleClass != null && styleClass.length() > 0) {
            writer.writeAttribute("class", styleClass, "styleClass");
        }

        renderPassThruAttributes(context, writer, component, ATTRIBUTES);

        writer.endElement("input");

    }


    @Override
    public boolean getRendersChildren() {

        return false;

    }


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

        // no-op

    }


    // ------------------------------------------------------- Protected Methods


    protected String getOnclick(UIComponent component, String targetURI) {

        String onclick = (String) component.getAttributes().get("onclick");

        if (onclick != null) {
            onclick = onclick.trim();
            if (onclick.length() > 0 && !onclick.endsWith(";")) {
                onclick += "; ";
            }
        }
        else {
            onclick = "";
        }

        if (targetURI != null) {
            onclick += "window.location.href='" + targetURI + "'; ";
        }

        onclick += "return false;";

        return onclick;
        
    }

}