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//
//  ========================================================================
//  Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.websocket.jsr356.server;

import javax.websocket.OnMessage;
import javax.websocket.server.ServerEndpoint;
import javax.websocket.server.ServerEndpointConfig;

import org.eclipse.jetty.websocket.api.WebSocketPolicy;
import org.eclipse.jetty.websocket.common.events.EventDriver;
import org.eclipse.jetty.websocket.common.events.EventDriverImpl;
import org.eclipse.jetty.websocket.jsr356.annotations.JsrEvents;
import org.eclipse.jetty.websocket.jsr356.annotations.OnMessageCallable;
import org.eclipse.jetty.websocket.jsr356.endpoints.EndpointInstance;
import org.eclipse.jetty.websocket.jsr356.endpoints.JsrAnnotatedEventDriver;

/**
 * Event Driver for classes annotated with @{@link ServerEndpoint}
 */
public class JsrServerEndpointImpl implements EventDriverImpl
{
    @Override
    public EventDriver create(Object websocket, WebSocketPolicy policy) throws Throwable
    {
        if (!(websocket instanceof EndpointInstance))
        {
            throw new IllegalStateException(String.format("Websocket %s must be an %s",websocket.getClass().getName(),EndpointInstance.class.getName()));
        }

        EndpointInstance ei = (EndpointInstance)websocket;
        AnnotatedServerEndpointMetadata metadata = (AnnotatedServerEndpointMetadata)ei.getMetadata();
        JsrEvents events = new JsrEvents<>(metadata);

        // Handle @OnMessage maxMessageSizes
        int maxBinaryMessage = getMaxMessageSize(policy.getMaxBinaryMessageSize(),metadata.onBinary,metadata.onBinaryStream);
        int maxTextMessage = getMaxMessageSize(policy.getMaxTextMessageSize(),metadata.onText,metadata.onTextStream);

        policy.setMaxBinaryMessageSize(maxBinaryMessage);
        policy.setMaxTextMessageSize(maxTextMessage);

        JsrAnnotatedEventDriver driver = new JsrAnnotatedEventDriver(policy,ei,events);
        // Handle @PathParam values
        ServerEndpointConfig config = (ServerEndpointConfig)ei.getConfig();
        if (config instanceof PathParamServerEndpointConfig)
        {
            PathParamServerEndpointConfig ppconfig = (PathParamServerEndpointConfig)config;
            driver.setPathParameters(ppconfig.getPathParamMap());
        }

        return driver;
    }

    @Override
    public String describeRule()
    {
        return "class is annotated with @" + ServerEndpoint.class.getName();
    }

    private int getMaxMessageSize(int defaultMaxMessageSize, OnMessageCallable... onMessages)
    {
        for (OnMessageCallable callable : onMessages)
        {
            if (callable == null)
            {
                continue;
            }
            OnMessage onMsg = callable.getMethod().getAnnotation(OnMessage.class);
            if (onMsg == null)
            {
                continue;
            }
            if (onMsg.maxMessageSize() > 0)
            {
                return (int)onMsg.maxMessageSize();
            }
        }
        return defaultMaxMessageSize;
    }

    @Override
    public boolean supports(Object websocket)
    {
        if (!(websocket instanceof EndpointInstance))
        {
            return false;
        }

        EndpointInstance ei = (EndpointInstance)websocket;
        Object endpoint = ei.getEndpoint();

        ServerEndpoint anno = endpoint.getClass().getAnnotation(ServerEndpoint.class);
        return (anno != null);
    }
}