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package com.sun.faces.renderkit.html_basic;

import com.sun.faces.util.FacesLogger;

import java.util.Collection;
import java.util.LinkedList;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.faces.FacesException;
import javax.faces.component.ActionSource;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.component.behavior.AjaxBehavior;
import javax.faces.component.behavior.ClientBehavior;
import javax.faces.component.behavior.ClientBehaviorContext;
import javax.faces.context.FacesContext;
import javax.faces.event.AjaxBehaviorEvent;
import javax.faces.event.PhaseId;
import javax.faces.render.ClientBehaviorRenderer;

import com.sun.faces.renderkit.RenderKitUtils;
import javax.el.ValueExpression;

/*
 *AjaxBehaviorRenderer renders Ajax behavior for a component.
 * It also  
 */

public class AjaxBehaviorRenderer extends ClientBehaviorRenderer  {
    
    // Log instance for this class
    protected static final Logger logger = FacesLogger.RENDERKIT.getLogger();

    
    // ------------------------------------------------------ Rendering Methods

    @Override
    public String getScript(ClientBehaviorContext behaviorContext,
                            ClientBehavior behavior) {
        if (!(behavior instanceof AjaxBehavior)) {
            // TODO: use MessageUtils for this error message?
            throw new IllegalArgumentException(
                "Instance of javax.faces.component.behavior.AjaxBehavior required: " + behavior);
        }

        return buildAjaxCommand(behaviorContext, (AjaxBehavior)behavior);
    }


    @Override
    public void decode(FacesContext context,
                       UIComponent component,
                       ClientBehavior behavior) {
        if (null == context || null == component || null == behavior) {
            throw new NullPointerException();
        }

        if (!(behavior instanceof AjaxBehavior)) {
            // TODO: use MessageUtils for this error message?
            throw new IllegalArgumentException(
                "Instance of javax.faces.component.behavior.AjaxBehavior required: " + behavior);
        }

        AjaxBehavior ajaxBehavior = (AjaxBehavior)behavior;

        // First things first - if AjaxBehavior is disabled, we are done.
        if (ajaxBehavior.isDisabled()) {
            return;
        }        

        component.queueEvent(createEvent(component, ajaxBehavior));

        if (logger.isLoggable(Level.FINE)) {
            logger.fine("This command resulted in form submission " +
                " AjaxBehaviorEvent queued.");
            logger.log(Level.FINE,
                "End decoding component {0}", component.getId());
        }


    }

    // Creates an AjaxBehaviorEvent for the specified component/behavior
    private static AjaxBehaviorEvent createEvent(UIComponent component,
                                                 AjaxBehavior ajaxBehavior) {

        AjaxBehaviorEvent event = new AjaxBehaviorEvent(component, ajaxBehavior);

        PhaseId phaseId = isImmediate(component, ajaxBehavior) ?
                              PhaseId.APPLY_REQUEST_VALUES :
                              PhaseId.INVOKE_APPLICATION;

        event.setPhaseId(phaseId);

        return event;
    }


    // Tests whether we should perform immediate processing.  Note
    // that we "inherit" immediate from the parent if not specified
    // on the behavior.
    private static boolean isImmediate(UIComponent component,
                                       AjaxBehavior ajaxBehavior) {

        boolean immediate = false;

        if (ajaxBehavior.isImmediateSet()) {
            immediate = ajaxBehavior.isImmediate();
        } else if (component instanceof EditableValueHolder) {
            immediate = ((EditableValueHolder)component).isImmediate();
        } else if (component instanceof ActionSource) {
            immediate = ((ActionSource)component).isImmediate();
        }

        return immediate;
    }
    private static String buildAjaxCommand(ClientBehaviorContext behaviorContext,
                                           AjaxBehavior ajaxBehavior) {

        // First things first - if AjaxBehavior is disabled, we are done.
        if (ajaxBehavior.isDisabled()) {
            return null;
        }        

        UIComponent component = behaviorContext.getComponent();
        String eventName = behaviorContext.getEventName();

        StringBuilder ajaxCommand = new StringBuilder(256);
        Collection execute = ajaxBehavior.getExecute();
        Collection render = ajaxBehavior.getRender();
        String onevent = ajaxBehavior.getOnevent();
        String onerror = ajaxBehavior.getOnerror();
        String sourceId = behaviorContext.getSourceId();
        String delay = ajaxBehavior.getDelay();
        Collection params = behaviorContext.getParameters();

        // Needed workaround for SelectManyCheckbox - if execute doesn't have sourceId,
        // we need to add it - otherwise, we use the default, which is sourceId:child, which
        // won't work.
        ClientBehaviorContext.Parameter foundparam = null;
        for (ClientBehaviorContext.Parameter param : params) {
            if (param.getName().equals("incExec") && (Boolean)param.getValue()) {
                foundparam = param;
            }
        }
        if (foundparam != null && !execute.contains(sourceId)) {
                execute = new LinkedList(execute);
                execute.add(component.getClientId());
        }
        if (foundparam != null) {
            try {
                // And since this is a hack, we now try to remove the param
                params.remove(foundparam);
            } catch (UnsupportedOperationException unop) {
                // nothing we can do about it
            }
        }

        ajaxCommand.append("mojarra.ab(");

        if (sourceId == null) {
            ajaxCommand.append("this");
        } else {
            ajaxCommand.append("'");
            ajaxCommand.append(sourceId);
            ajaxCommand.append("'");
        }

        ajaxCommand.append(",event,'");
        ajaxCommand.append(eventName);
        ajaxCommand.append("',");

        appendIds(component, ajaxCommand, execute);
        ajaxCommand.append(",");
        appendIds(component, ajaxCommand, render);

        if ((onevent != null) || (onerror != null) || (delay != null) || !params.isEmpty())  {

            ajaxCommand.append(",{");

            if (onevent != null) {
                RenderKitUtils.appendProperty(ajaxCommand, "onevent", onevent, false);
            }

            if (onerror != null) {
                RenderKitUtils.appendProperty(ajaxCommand, "onerror", onerror, false);
            }
            
            if (delay != null) {
                RenderKitUtils.appendProperty(ajaxCommand, "delay", delay, true);
            }

            if (!params.isEmpty()) {
                for (ClientBehaviorContext.Parameter param : params) {
                    RenderKitUtils.appendProperty(ajaxCommand, 
                                                  param.getName(),
                                                  param.getValue());
                }
            }
             
            ajaxCommand.append("}");
        }

        ajaxCommand.append(")");

        return ajaxCommand.toString();
    }

    // Appends an ids argument to the ajax command
    private static void appendIds(UIComponent component,
                                  StringBuilder builder,
                                  Collection ids) {

        if ((null == ids) || ids.isEmpty()) {
            builder.append('0');
            return;
        }

        builder.append("'");

        boolean first = true;

        for (String id : ids) {
            if (id.trim().length() == 0) {
                continue;
            }
            if (!first) {
                builder.append(' ');
            } else {
                first = false;
            }

            if (id.equals("@all") || id.equals("@none") ||
                id.equals("@form") || id.equals("@this")) {
                builder.append(id);
            } else {
                builder.append(getResolvedId(component, id));
            }
        }

        builder.append("'");
    }

    // Returns the resolved (client id) for a particular id.
    private static String getResolvedId(UIComponent component, String id) {

        UIComponent resolvedComponent = component.findComponent(id);
        if (resolvedComponent == null) {
            // RELEASE_PENDING  i18n
            throw new FacesException(
                " contains an unknown id '"
                + id
                + "' - cannot locate it in the context of the component "+component.getId());
        }

        return resolvedComponent.getClientId();
    }
}




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