/**

 * HTML via Java(tm) Language Bindings

 * Copyright (C) 2013 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details. apidesign.org

 * designates this particular file as subject to the

 * "Classpath" exception as provided by apidesign.org

 * in the License file that accompanied this code.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. Look for COPYING file in the top folder.

 * If not, see http://wiki.apidesign.org/wiki/GPLwithClassPathException

 */

package org.apidesign.html.json.impl;

import net.java.html.BrwsrCtx;

/** Super type for those who wish to receive JSON messages.

 *

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

 */

public abstract class RcvrJSON {

    protected void onOpen(MsgEvnt msg) {}

    protected abstract void onMessage(MsgEvnt msg);

    protected void onClose(MsgEvnt msg) {}

    protected abstract void onError(MsgEvnt msg);

    public abstract static class MsgEvnt {

        MsgEvnt() {

        }

        public Throwable getError() {

            return null;

        }

        public final Exception getException() {

            Throwable t = getError();

            if (t instanceof Exception) {

                return (Exception)t;

            }

            if (t == null) {

                return null;

            }

            return new Exception(t);

        }

        public int dataSize() {

            return -1;

        }

        public <Data> void dataRead(BrwsrCtx ctx, Class<? extends Data> type, Data[] fillTheArray) {

        }

        public abstract void dispatch(RcvrJSON r);

        public static MsgEvnt createError(final Throwable t) {

            return new MsgEvnt() {

                @Override

                public Throwable getError() {

                    return t;

                }

                @Override

                public void dispatch(RcvrJSON r) {

                    r.onError(this);

                }

            };

        }

        public static MsgEvnt createMessage(final Object value) {

            return new MsgEvnt() {

                @Override

                public int dataSize() {

                    if (value instanceof Object[]) {

                        return ((Object[])value).length;

                    } else {

                        return 1;

                    }

                }

                @Override

                public <Data> void dataRead(BrwsrCtx context, Class<? extends Data> type, Data[] arr) {

                    if (value instanceof Object[]) {

                        Object[] data = ((Object[]) value);

                        for (int i = 0; i < data.length && i < arr.length; i++) {

                            arr[i] = org.apidesign.html.json.impl.JSON.read(context, type, data[i]);

                        }

                    } else {

                        if (arr.length > 0) {

                            arr[0] = org.apidesign.html.json.impl.JSON.read(context, type, value);

                        }

                    }

                }

                @Override

                public void dispatch(RcvrJSON r) {

                    r.onMessage(this);

                }

            };

        }

        public static MsgEvnt createOpen() {

            return new MsgEvnt() {

                @Override

                public void dispatch(RcvrJSON r) {

                    r.onOpen(this);

                }

            };

        }

        public static MsgEvnt createClose() {

            return new MsgEvnt() {

                @Override

                public void dispatch(RcvrJSON r) {

                    r.onClose(this);

                }

            };

        }

    } // end MsgEvnt

}