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package org.glassfish.admingui.common.help;

import com.sun.jsftemplating.annotation.Handler;
import com.sun.jsftemplating.annotation.HandlerInput;
import com.sun.jsftemplating.annotation.HandlerOutput;
import com.sun.jsftemplating.layout.descriptors.handler.HandlerContext;

import org.glassfish.admingui.common.handlers.PluginHandlers;
import org.glassfish.admingui.plugin.ConsolePluginService;
import org.glassfish.admingui.connector.Index;
import org.glassfish.admingui.connector.IntegrationPoint;
import org.glassfish.admingui.connector.TOC;

import java.util.Locale;


/**
 *  	These handlers help make the help system work.
 *
 *  @author Ken Paulsen ([email protected])
 */
public class HelpHandlers {

    /**
     *	 This handler provides access to {@link IntegrationPoint}s for the
     *	    requested key.
     *
     *	@param	handlerCtx	The HandlerContext.
     */
    @Handler(id="getHelpTOC",
    	input={
            @HandlerInput(name="locale", type=Locale.class)},
        output={
            @HandlerOutput(name="toc", type=TOC.class)})
    public static void getHelpTOC(HandlerContext handlerCtx) {
	// Get the desired Locale and the ConsolePluginService...
	Locale locale = (Locale) handlerCtx.getInputValue("locale");
	ConsolePluginService cps = PluginHandlers.getPluginService(
		handlerCtx.getFacesContext());

	// Determine the correct locale for the path...
	String localePath = getHelpLocalePath(locale, cps);

	handlerCtx.setOutputValue("toc", cps.getHelpTOC(localePath));
    }

    /**
     *	 This handler provides access to {@link IntegrationPoint}s for the
     *	    requested key.
     *
     *	@param	handlerCtx	The HandlerContext.
     */
    @Handler(id="getHelpIndex",
    	input={
            @HandlerInput(name="locale", type=Locale.class)},
        output={
            @HandlerOutput(name="index", type=Index.class)})
    public static void getHelpIndex(HandlerContext handlerCtx) {
	// Get the desired Locale and the ConsolePluginService...
	Locale locale = (Locale) handlerCtx.getInputValue("locale");
	ConsolePluginService cps = PluginHandlers.getPluginService(
		handlerCtx.getFacesContext());

	// Determine the correct locale for the path...
	String localePath = getHelpLocalePath(locale, cps);

	handlerCtx.setOutputValue("index", cps.getHelpIndex(localePath));
    }

    /**
     *	 This method calculates the correct locale portion of the help path
     *	    for the requested locale.
     */
    private static String getHelpLocalePath(Locale locale, ConsolePluginService cps) {
	// Use common toc.xml to validate locale path...
	ClassLoader loader = cps.getModuleClassLoader("common");
	String path = PluginHandlers.getHelpPathForResource(
		"toc.xml", locale, loader);
	if (path == null) {
	    // Not found, try the system default...
	    path = PluginHandlers.getHelpPathForResource(
		"toc.xml", Locale.getDefault(), loader);
	    if (path == null) {
		// Default to "en"
		path = "/en/";
	    }
	}

	// Return the locale-portion of the path
	return path.substring(1, path.indexOf('/', 1));
    }
}