/*

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

package org.apache.batik.bridge;

import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.PrivilegedAction;


import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.ImporterTopLevel;
import org.mozilla.javascript.NativeObject;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.apache.batik.w3c.dom.Location;

/**
 * This class wraps a Window object to expose it to the interpreter.
 * This will be the Global Object of our interpreter.
 *
 * @author <a href="mailto:cjolif@ilog.fr">Christophe Jolif</a>
 * @author <a href="mailto:stephane@hillion.org">Stephane Hillion</a>
 * @version $Id$
 */
public class WindowWrapper extends ImporterTopLevel {

    private static final Object[] EMPTY_ARGUMENTS = new Object[0];

    /**
     * The rhino interpreter.
     */
    protected RhinoInterpreter interpreter;

    /**
     * The wrapped window.
     */
    protected Window window;

    /**
     * Creates a new WindowWrapper.
     */
    public WindowWrapper(Context context) {
        super(context);
        String[] names = { "setInterval", "setTimeout", "clearInterval",
                           "clearTimeout", "parseXML", "printNode", "getURL",
                           "postURL", "alert", "confirm", "prompt" };
        this.defineFunctionProperties(names, WindowWrapper.class,
                                      ScriptableObject.DONTENUM);
        this.defineProperty("location", WindowWrapper.class,
                            ScriptableObject.PERMANENT);
    }

    public String getClassName() {
        return "Window";
    }

    public String toString() {
        return "[object Window]";
    }

    /**
     * Wraps the 'setInterval' methods of the Window interface.
     */
    public static Object setInterval(Context cx,
                                     Scriptable thisObj,
                                     Object[] args,
                                     Function funObj) {
        int len = args.length;
        WindowWrapper ww = (WindowWrapper)thisObj;
        Window window = ww.window;

        if (len < 2) {
            throw Context.reportRuntimeError("invalid argument count");
        }
        long to = (Long) Context.jsToJava(args[1], Long.TYPE);
        if (args[0] instanceof Function) {
            RhinoInterpreter interp =
                (RhinoInterpreter)window.getInterpreter();
            FunctionWrapper fw;
            fw = new FunctionWrapper(interp, (Function)args[0],
                                     EMPTY_ARGUMENTS);
            return Context.toObject(window.setInterval(fw, to), thisObj);
        }
        String script =
            (String)Context.jsToJava(args[0], String.class);
        return Context.toObject(window.setInterval(script, to), thisObj);
    }

    /**
     * Wraps the 'setTimeout' methods of the Window interface.
     */
    public static Object setTimeout(Context cx,
                                    Scriptable thisObj,
                                    Object[] args,
                                    Function funObj) {
        int len = args.length;
        WindowWrapper ww = (WindowWrapper)thisObj;
        Window window = ww.window;
        if (len < 2) {
            throw Context.reportRuntimeError("invalid argument count");
        }
        long to = (Long) Context.jsToJava(args[1], Long.TYPE);
        if (args[0] instanceof Function) {
            RhinoInterpreter interp =
                (RhinoInterpreter)window.getInterpreter();
            FunctionWrapper fw;
            fw = new FunctionWrapper(interp, (Function)args[0],
                                     EMPTY_ARGUMENTS);
            return Context.toObject(window.setTimeout(fw, to), thisObj);
        }
        String script =
            (String)Context.jsToJava(args[0], String.class);
        return Context.toObject(window.setTimeout(script, to), thisObj);
    }

    /**
     * Wraps the 'clearInterval' method of the Window interface.
     */
    public static void clearInterval(Context cx,
                                     Scriptable thisObj,
                                     Object[] args,
                                     Function funObj) {
        int len = args.length;
        WindowWrapper ww = (WindowWrapper)thisObj;
        Window window = ww.window;
        if (len >= 1) {
            window.clearInterval(Context.jsToJava(args[0], Object.class));
        }
    }

    /**
     * Wraps the 'clearTimeout' method of the Window interface.
     */
    public static void clearTimeout(Context cx,
                                    Scriptable thisObj,
                                    Object[] args,
                                    Function funObj) {
        int len = args.length;
        WindowWrapper ww = (WindowWrapper)thisObj;
        Window window = ww.window;
        if (len >= 1) {
            window.clearTimeout(Context.jsToJava(args[0], Object.class));
        }
    }

    /**
     * Wraps the 'parseXML' method of the Window interface.
     */
    public static Object parseXML(Context cx,
                                  Scriptable thisObj,
                                  final Object[] args,
                                  Function funObj) {
        int len = args.length;
        WindowWrapper ww = (WindowWrapper)thisObj;
        final Window window = ww.window;
        if (len < 2) {
            throw Context.reportRuntimeError("invalid argument count");
        }

        RhinoInterpreter     interp = (RhinoInterpreter)window.getInterpreter();
        AccessControlContext acc    = interp.getAccessControlContext();

        PrivilegedAction pa = new PrivilegedAction() {
                public Object run() {
                    return window.parseXML
                        ((String)Context.jsToJava(args[0], String.class),
                         (Document)Context.jsToJava(args[1], Document.class));
                }
            };

        Object ret;
        // If acc is null we are running in an Applet (or some other
        // restrictive environment) so don't sweat security it's
        // the "Browsers" problem...
        if (acc != null) ret = AccessController.doPrivileged(pa , acc);
        else             ret = AccessController.doPrivileged(pa);

        return Context.toObject(ret, thisObj);
    }

    /**
     * Wraps the 'printNode' method of the Window interface.
     */
    public static Object printNode(Context cx,
                                   Scriptable thisObj,
                                   final Object[] args,
                                   Function funObj) {
        if (args.length != 1) {
            throw Context.reportRuntimeError("invalid argument count");
        }

        WindowWrapper ww = (WindowWrapper)thisObj;
        final Window window = ww.window;

        AccessControlContext acc =
            ((RhinoInterpreter)window.getInterpreter()).getAccessControlContext();

        Object ret = AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return window.printNode
                        ((Node) Context.jsToJava(args[0], Node.class));
                }
            }, acc);
        return Context.toString(ret);
    }

    /**
     * Wraps the 'getURL' method of the Window interface.
     */
    public static void getURL(Context cx,
                              Scriptable thisObj,
                              final Object[] args,
                              Function funObj) {
        int len = args.length;
        WindowWrapper ww = (WindowWrapper)thisObj;
        final Window window = ww.window;
        if (len < 2) {
            throw Context.reportRuntimeError("invalid argument count");
        }
        RhinoInterpreter interp =
            (RhinoInterpreter)window.getInterpreter();
        final String uri = (String)Context.jsToJava(args[0], String.class);
        Window.URLResponseHandler urlHandler = null;
        if (args[1] instanceof Function) {
            urlHandler = new GetURLFunctionWrapper
                (interp, (Function)args[1], ww);
        } else {
            urlHandler = new GetURLObjectWrapper
                (interp, (NativeObject)args[1], ww);
        }
        final Window.URLResponseHandler fw = urlHandler;

        AccessControlContext acc =
            ((RhinoInterpreter)window.getInterpreter()).getAccessControlContext();

        if (len == 2) {
            AccessController.doPrivileged(new PrivilegedAction() {
                    public Object run(){
                        window.getURL(uri, fw);
                        return null;
                    }
                }, acc);
        } else {
            AccessController.doPrivileged(new PrivilegedAction() {
                    public Object run() {
                        window.getURL
                            (uri, fw,
                             (String)Context.jsToJava(args[2], String.class));
                        return null;
                    }
                }, acc);
        }
    }

    /**
     * Wraps the 'postURL' method of the Window interface.
     */
    public static void postURL(Context cx,
                               Scriptable thisObj,
                               final Object[] args,
                               Function funObj) {
        int len = args.length;
        WindowWrapper ww = (WindowWrapper)thisObj;
        final Window window = ww.window;
        if (len < 3) {
            throw Context.reportRuntimeError("invalid argument count");
        }
        RhinoInterpreter interp =
            (RhinoInterpreter)window.getInterpreter();
        final String uri     = (String)Context.jsToJava(args[0], String.class);
        final String content = (String)Context.jsToJava(args[1], String.class);
        Window.URLResponseHandler urlHandler = null;
        if (args[2] instanceof Function) {
            urlHandler = new GetURLFunctionWrapper
                (interp, (Function)args[2], ww);
        } else {
            urlHandler = new GetURLObjectWrapper
                (interp, (NativeObject)args[2], ww);
        }
        final Window.URLResponseHandler fw = urlHandler;

        AccessControlContext acc;
        acc = interp.getAccessControlContext();

        switch (len) {
        case 3:
            AccessController.doPrivileged(new PrivilegedAction() {
                    public Object run(){
                        window.postURL(uri, content, fw);
                        return null;
                    }
                }, acc);
            break;
        case 4:
            AccessController.doPrivileged(new PrivilegedAction() {
                    public Object run() {
                        window.postURL
                            (uri, content, fw,
                             (String)Context.jsToJava(args[3], String.class));
                        return null;
                    }
                }, acc);
            break;
        default:
            AccessController.doPrivileged(new PrivilegedAction() {
                    public Object run() {
                        window.postURL
                            (uri, content, fw,
                             (String)Context.jsToJava(args[3], String.class),
                             (String)Context.jsToJava(args[4], String.class));
                        return null;
                    }
                }, acc);
        }
    }

    /**
     * Wraps the 'alert' method of the Window interface.
     */
    public static void alert(Context cx,
                             Scriptable thisObj,
                             Object[] args,
                             Function funObj) {
        int len = args.length;
        WindowWrapper ww = (WindowWrapper)thisObj;
        Window window = ww.window;
        if (len >= 1) {
            String message =
                (String)Context.jsToJava(args[0], String.class);
            window.alert(message);
        }
    }

    /**
     * Wraps the 'confirm' method of the Window interface.
     */
    public static Object confirm(Context cx,
                                  Scriptable thisObj,
                                  Object[] args,
                                  Function funObj) {
        int len = args.length;
        WindowWrapper ww = (WindowWrapper)thisObj;
        Window window = ww.window;
        if (len >= 1) {
            String message =
                (String)Context.jsToJava(args[0], String.class);
            if (window.confirm(message))
                return Context.toObject(Boolean.TRUE, thisObj);
            else
                return Context.toObject(Boolean.FALSE, thisObj);
        }
        return Context.toObject(Boolean.FALSE, thisObj);
    }

    /**
     * Wraps the 'prompt' method of the Window interface.
     */
    public static Object prompt(Context cx,
                                Scriptable thisObj,
                                Object[] args,
                                Function funObj) {

        WindowWrapper ww = (WindowWrapper)thisObj;
        Window window = ww.window;
        Object result;
        switch (args.length) {
            case 0:
                result = "";
                break;
            case 1:
                String message =
                    (String)Context.jsToJava(args[0], String.class);
                result = window.prompt(message);
                break;
            default:
                message =
                    (String)Context.jsToJava(args[0], String.class);
                String defVal =
                    (String)Context.jsToJava(args[1], String.class);
                result = window.prompt(message, defVal);
                break;
        }

        if (result == null) {
            return null;
        }
        return Context.toString(result);
    }

    /**
     * Return the Location for this Window.
     */
    public Location getLocation() {
        return window.getLocation();
    }

    /**
     * Return the Location for this Window.
     */
    public void setLocation(Object val) {
        String url = (String)Context.jsToJava(val, String.class);
        window.getLocation().assign(url);
    }

    /**
     * To wrap a function in an handler.
     */
    protected static class FunctionWrapper implements Runnable {

        /**
         * The current interpreter.
         */
        protected RhinoInterpreter interpreter;

        /**
         * The function wrapper.
         */
        protected Function function;

        /**
         * The arguments.
         */
        protected Object[] arguments;

        /**
         * Creates a function wrapper.
         */
        public FunctionWrapper(RhinoInterpreter ri,
                               Function f,
                               Object[] args) {
            interpreter = ri;
            function = f;
            arguments = args;
        }

        /**
         * Calls the function.
         */
        public void run() {
            interpreter.callHandler(function, arguments);
        }
    }

    /**
     * To wrap a function passed to getURL().
     */
    protected static class GetURLFunctionWrapper
        implements Window.URLResponseHandler {

        /**
         * The current interpreter.
         */
        protected RhinoInterpreter interpreter;

        /**
         * The function wrapper.
         */
        protected Function function;

        /**
         * The WindowWrapper
         */
        protected WindowWrapper windowWrapper;

        /**
         * Creates a wrapper.
         */
        public GetURLFunctionWrapper(RhinoInterpreter ri, Function fct,
                                     WindowWrapper ww) {
            interpreter = ri;
            function = fct;
            windowWrapper = ww;
        }

        /**
         * Called before 'getURL()' returns.
         * @param success Whether the data was successfully retreived.
         * @param mime The data MIME type.
         * @param content The data.
         */
        public void getURLDone(final boolean success,
                               final String mime,
                               final String content) {
            interpreter.callHandler
                (function,
                 new GetURLDoneArgBuilder(success, mime,
                                          content, windowWrapper));
        }
    }

    /**
     * To wrap an object passed to getURL().
     */
    private static class GetURLObjectWrapper
        implements Window.URLResponseHandler {

        /**
         * The current interpreter.
         */
        private RhinoInterpreter interpreter;

        /**
         * The object wrapper.
         */
        private ScriptableObject object;

        /**
         * The Scope for the callback.
         */
        private WindowWrapper windowWrapper;

        private static final String COMPLETE = "operationComplete";

        /**
         * Creates a wrapper.
         */
        public GetURLObjectWrapper(RhinoInterpreter ri,
                                   ScriptableObject obj,
                                   WindowWrapper ww) {
            interpreter = ri;
            object = obj;
            windowWrapper = ww;
        }

        /**
         * Called before 'getURL()' returns.
         * @param success Whether the data was successfully retreived.
         * @param mime The data MIME type.
         * @param content The data.
         */
        public void getURLDone(final boolean success,
                               final String mime,
                               final String content) {
            interpreter.callMethod
                (object, COMPLETE,
                 new GetURLDoneArgBuilder(success, mime,
                                          content, windowWrapper));
        }
    }

    static class GetURLDoneArgBuilder
        implements RhinoInterpreter.ArgumentsBuilder {
        boolean success;
        String mime, content;
        WindowWrapper windowWrapper;
        public GetURLDoneArgBuilder(boolean success,
                                    String mime, String content,
                                    WindowWrapper ww) {
            this.success = success;
            this.mime    = mime;
            this.content = content;
            this.windowWrapper = ww;
        }

        public Object[] buildArguments() {
            ScriptableObject so = new NativeObject();
            so.put("success", so,
                   (success) ? Boolean.TRUE : Boolean.FALSE);
            if (mime != null) {
                so.put("contentType", so,
                       Context.toObject(mime, windowWrapper));
            }
            if (content != null) {
                so.put("content", so,
                       Context.toObject(content, windowWrapper));
            }
            return new Object [] { so };
        }
    }
}
