/**

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2013-2013 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

 * License.  When distributing the software, include this License Header

 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

 * your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * Contributor(s):

 *

 * The Original Software is NetBeans. The Initial Developer of the Original

 * Software is Oracle. Portions Copyright 2013-2013 Oracle. All Rights Reserved.

 *

 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

 * under the [CDDL or GPL Version 2] license." If you do not indicate a

 * single choice of license, a recipient has the option to distribute

 * your version of this file under either the CDDL, the GPL Version 2 or

 * to extend the choice of license to its licensees as provided above.

 * However, if you add GPL Version 2 code and therefore, elected the GPL

 * Version 2 license, then the option applies only if the new code is

 * made subject to such option by the copyright holder.

 */

package org.apidesign.html.json.spi;

import java.util.Collection;

import java.util.List;

import net.java.html.BrwsrCtx;

import org.netbeans.html.json.impl.Bindings;

import org.netbeans.html.json.impl.JSON;

import org.netbeans.html.json.impl.JSONList;

import org.netbeans.html.json.impl.RcvrJSON;

import org.netbeans.html.json.impl.RcvrJSON.MsgEvnt;

/**

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 * @since 0.7

 */

public final class Proto {

    private final Object obj;

    private final Type type;

    private final net.java.html.BrwsrCtx context;

    private boolean locked;

    private org.netbeans.html.json.impl.Bindings ko;

    Proto(Object obj, Type type, BrwsrCtx context) {

        this.obj = obj;

        this.type = type;

        this.context = context;

    }

    public BrwsrCtx getContext() {

        return context;

    }

    public void acquireLock() throws IllegalStateException {

        if (locked) throw new IllegalStateException();

        locked = true;

    }

    public void checkLock() throws IllegalStateException {

        if (locked) throw new IllegalStateException();

    }

    public void releaseLock() {

        locked = false;

    }

    public void valueHasMutated(String propName) {

        if (ko != null) {

            ko.valueHasMutated(propName);

        }

    }

    public void applyBindings() {

        initBindings().applyBindings();

    }

    public void runInBrowser(Runnable run) {

        JSON.runInBrowser(context, run);

    }

    public void initTo(Collection<?> to, Object array) {

        if (ko != null) {

            throw new IllegalStateException();

        }

        if (to instanceof JSONList) {

           ((JSONList)to).init(array);

        } else {

            JSONList.init(to, array);

        }

    }

    public void extract(Object json, String[] props, Object[] values) {

        JSON.extract(context, json, props, values);

    }

    public <T> T read(Class<T> modelClass, Object data) {

        return JSON.read(context, modelClass, data);

    }

    // XXX: Don't expose internal type

    public Bindings initBindings() {

        if (ko == null) {

            Bindings b = Bindings.apply(context, obj);

            PropertyBinding[] pb = new PropertyBinding[type.propertyNames.length];

            for (int i = 0; i < pb.length; i++) {

                pb[i] = b.registerProperty(

                    type.propertyNames[i], i, obj, type, type.propertyReadOnly[i]

                );

            }

            FunctionBinding[] fb = new FunctionBinding[type.functions.length];

            for (int i = 0; i < fb.length; i++) {

                fb[i] = FunctionBinding.registerFunction(

                    type.functions[i], i, obj, type

                );

            }

            ko = b;

            b.finish(obj, pb, fb);

        }

        return ko;

    }

    // XXX: Don't expose internal type

    public Bindings getBindings() {

        return ko;

    }

    // XXX: Can be hidden too

    public void onChange(int index) {

        type.onChange(obj, index);

    }

    public void loadJSON(final int index, 

        String urlBefore, String urlAfter, String method,

        final Object data

    ) {

        class Rcvr extends RcvrJSON {

            @Override

            protected void onMessage(MsgEvnt msg) {

                type.onMessage(obj, index, 1, msg.getValues());

            }

            @Override

            protected void onError(MsgEvnt msg) {

                type.onMessage(obj, index, 2, msg.getException());

            }

        }

        JSON.loadJSON(context, new Rcvr(), urlBefore, urlAfter, method, data);

    }

    public String toString(Object data, String propName) {

        return JSON.toString(context, data, propName);

    }

    public Number toNumber(Object data, String propName) {

        return JSON.toNumber(context, data, propName);

    }

    public <T> T toModel(Class<T> type, Object data, String propName) {

        return JSON.toModel(context, type, data, propName);

    }

    public <T> List<T> createList(String propName, int onChange, String... dependingProps) {

        return new JSONList<T>(this, propName, onChange, dependingProps);

    }

    public <T> void cloneList(Collection<T> to, BrwsrCtx ctx, Collection<T> from) {

        Boolean isModel = null;

        for (T t : from) {

            if (isModel == null) {

                isModel = JSON.isModel(t.getClass());

            }

            if (isModel) {

                to.add(JSON.bindTo(t, ctx));

            } else {

                to.add(t);

            }

        }

    }

    /** Functionality used by the code generated by annotation

     * processor for the {@link net.java.html.json.Model} annotation.

     * 

     * @param <Model> the generated class

     * @since 0.7

     */

    public static abstract class Type<Model> {

        private final Class<Model> clazz;

        private final String[] propertyNames;

        private final boolean[] propertyReadOnly;

        private final String[] functions;

        protected Type(

            Class<Model> clazz, Class<?> modelFor, int properties, int functions

        ) {

            assert getClass().getName().endsWith("$Html4JavaType");

            assert getClass().getDeclaringClass() == clazz;

            this.clazz = clazz;

            this.propertyNames = new String[properties];

            this.propertyReadOnly = new boolean[properties];

            this.functions = new String[functions];

            JSON.register(clazz, this);

        }

        protected final void registerProperty(String name, int index, boolean readOnly) {

            assert propertyNames[index] == null;

            propertyNames[index] = name;

            propertyReadOnly[index] = readOnly;

        }

        protected final void registerFunction(String name, int index) {

            assert functions[index] == null;

            functions[index] = name;

        }

        public Proto protoFor(Object obj, BrwsrCtx context) {

            return new Proto(obj, this, context);

        }

        // XXX: should be protected

        public abstract void setValue(Model model, int index, Object value);

        public abstract Object getValue(Model model, int index);

        public abstract void call(Model model, int index, Object data, Object event);

        public abstract Model cloneTo(Object model, BrwsrCtx ctx);

        public abstract Model read(BrwsrCtx c, Object json);

        public abstract void onChange(Model model, int index);

        public abstract Proto protoFor(Object object);

        /**

         * 

         * @param model

         * @param index

         * @param type 0 - onOpen, 1 - onMessage, 2 - onError, 3 - onClose

         * @param data 

         */

        public abstract void onMessage(Model model, int index, int type, Object data);

        public <T> void copyJSON(BrwsrCtx context, Object[] src, Class<T> destType, T[] dest) {

            for (int i = 0; i < src.length && i < dest.length; i++) {

                dest[i] = org.netbeans.html.json.impl.JSON.read(context, destType, src[i]);

            }

        }

        //

        // Various support methods the generated classes use

        //

        /** Compares two objects that can be converted to integers.

         * @return true if they are the same

         */

        public final boolean isSame(int a, int b) {

            return a == b;

        }

        /** Compares two objects that can be converted to (floating point)

         * numbers.

         * @return  true if they are the same

         */

        public final boolean isSame(double a, double b) {

            return a == b;

        }

        /** Compares two objects for being the same - e.g. either <code>==</code>

         * or <code>equals</code>.

         * @return true if they are equals

         */ 

        public final boolean isSame(Object a, Object b) {

            if (a == b) {

                return true;

            }

            if (a == null || b == null) {

                return false;

            }

            return a.equals(b);

        }

        /** Cumulative hash function. Adds hashcode of the object to the

         * previous value.

         * @param o the object (or <code>null</code>)

         * @param h the previous value of the hash

         * @return new hash - the old one xor the object's one

         */

        public final int hashPlus(Object o, int h) {

            return o == null ? h : h ^ o.hashCode();

        }

        /** Converts an object to its JSON value.

         * 

         * @param obj the object to convert

         * @return JSON representation of the object

         */

        public final String toJSON(Object obj) {

            return JSON.toJSON(obj);

        }

        /** Converts the value to string.

         * 

         * @param val the value

         * @return the converted value

         */

        public final String stringValue(Object val) {

            return JSON.stringValue(val);

        }

        /** Converts the value to number.

         * 

         * @param val the value

         * @return the converted value

         */

        public final Number numberValue(Object val) {

            return JSON.numberValue(val);

        }

        /** Converts the value to character.

         * 

         * @param val the value

         * @return the converted value

         */

        public final Character charValue(Object val) {

            return JSON.charValue(val);

        }

        /** Converts the value to boolean.

         * 

         * @param val the value

         * @return the converted value

         */

        public final Boolean boolValue(Object val) {

            return JSON.boolValue(val);

        }

        /** Extracts value of specific type from given object.

         * 

         * @param <T> the type of object one is interested in

         * @param type the type

         * @param val the object to convert to type

         * @return the converted value

         */

        public final <T> T extractValue(Class<T> type, Object val) {

            if (Number.class.isAssignableFrom(type)) {

                val = numberValue(val);

            }

            if (Boolean.class == type) {

                val = boolValue(val);

            }

            if (String.class == type) {

                val = stringValue(val);

            }

            if (Character.class == type) {

                val = charValue(val);

            }

            if (Integer.class == type) {

                val = val instanceof Number ? ((Number) val).intValue() : 0;

            }

            if (Long.class == type) {

                val = val instanceof Number ? ((Number) val).longValue() : 0;

            }

            if (Short.class == type) {

                val = val instanceof Number ? ((Number) val).shortValue() : 0;

            }

            if (Byte.class == type) {

                val = val instanceof Number ? ((Number) val).byteValue() : 0;

            }

            if (Double.class == type) {

                val = val instanceof Number ? ((Number) val).doubleValue() : Double.NaN;

            }

            if (Float.class == type) {

                val = val instanceof Number ? ((Number) val).floatValue() : Float.NaN;

            }

            return type.cast(val);

        }

    }

}