package Torello.Browser;

import java.util.*;
import javax.json.*;
import javax.json.stream.*;
import java.io.*;

import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.function.Function;

import Torello.Java.Additional.*;
import Torello.Java.JSON.*;

import static Torello.Java.JSON.JFlag.*;

import Torello.Java.StrCmpr;
import Torello.JavaDoc.StaticFunctional;
import Torello.JavaDoc.JDHeaderBackgroundImg;
import Torello.JavaDoc.Excuse;

/**
 * <SPAN CLASS=COPIEDJDK><B>The Tethering domain defines methods and events for browser port binding.</B></SPAN>
 * 
 * <EMBED CLASS='external-html' DATA-FILE-ID=CODE_GEN_NOTE>
 */
@StaticFunctional(Excused={"counter"}, Excuses={Excuse.CONFIGURATION})
@JDHeaderBackgroundImg(EmbedTagFileID="WOOD_PLANK_NOTE")
public class Tethering
{
    // ********************************************************************************************
    // ********************************************************************************************
    // Class Header Stuff
    // ********************************************************************************************
    // ********************************************************************************************


    // No Pubic Constructors
    private Tethering () { }

    // These two Vector's are used by all the "Methods" exported by this class.  java.lang.reflect
    // is used to generate the JSON String's.  It saves thousands of lines of Auto-Generated Code.
    private static final Map<String, Vector<String>>    parameterNames = new HashMap<>();
    private static final Map<String, Vector<Class<?>>>  parameterTypes = new HashMap<>();

    // Some Methods do not take any parameters - for instance all the "enable()" and "disable()"
    // I simply could not get ride of RAW-TYPES and UNCHECKED warnings... so there are now,
    // offically, two empty-vectors.  One for String's, and the other for Classes.

    private static final Vector<String>     EMPTY_VEC_STR = new Vector<>();
    private static final Vector<Class<?>>   EMPTY_VEC_CLASS = new Vector<>();

    static
    {
        for (Method m : Tethering.class.getMethods())
        {
            // This doesn't work!  The parameter names are all "arg0" ... "argN"
            // It works for java.lang.reflect.Field, BUT NOT java.lang.reflect.Parameter!
            //
            // Vector<String> parameterNamesList = new Vector<>(); -- NOPE!

            Vector<Class<?>> parameterTypesList = new Vector<>();
        
            for (Parameter p : m.getParameters()) parameterTypesList.add(p.getType());

            parameterTypes.put(
                m.getName(),
                (parameterTypesList.size() > 0) ? parameterTypesList : EMPTY_VEC_CLASS
            );
        }
    }

    static
    {
        Vector<String> v = null;

        v = new Vector<String>(1);
        parameterNames.put("bind", v);
        Collections.addAll(v, new String[]
        { "port", });

        v = new Vector<String>(1);
        parameterNames.put("unbind", v);
        Collections.addAll(v, new String[]
        { "port", });
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // Types - Static Inner Classes
    // ********************************************************************************************
    // ********************************************************************************************

    /** Informs that port was successfully bound and got a specified connection id. */
    public static class accepted
        extends BrowserEvent
        implements java.io.Serializable
    {
        /** For Object Serialization.  java.io.Serializable */
        protected static final long serialVersionUID = 1;
        
        public boolean[] optionals()
        { return new boolean[] { false, false, }; }
        
        /** Port number that was successfully bound. */
        public final int port;
        
        /** Connection id to be used. */
        public final String connectionId;
        
        /**
         * Constructor
         *
         * @param port Port number that was successfully bound.
         * 
         * @param connectionId Connection id to be used.
         */
        public accepted(int port, String connectionId)
        {
            super("Tethering", "accepted", 2);
            
            // Exception-Check(s) to ensure that if any parameters which are not declared as
            // 'Optional', but have a 'null' value anyway, that a NullPointerException shall throw.
            
            if (connectionId == null) BRDPC.throwNPE("connectionId");
            
            this.port          = port;
            this.connectionId  = connectionId;
        }
        
        /**
         * JSON Object Constructor
         * @param jo A Json-Object having data about an instance of {@code 'accepted'}.
         */
        public accepted (JsonObject jo)
        {
            super("Tethering", "accepted", 2);
        
            this.port          = ReadPrimJSON.getInt(jo, "port");
            this.connectionId  = ReadJSON.getString(jo, "connectionId", false, true);
        }
        
        
        /** Checks whether {@code 'this'} equals an input Java-{@code Object} */
        public boolean equals(Object other)
        {
            if (other == null)                       return false;
            if (other.getClass() != this.getClass()) return false;
        
            accepted o = (accepted) other;
        
            return
                    (this.port == o.port)
                &&  Objects.equals(this.connectionId, o.connectionId);
        }
        
        /** Generates a Hash-Code for {@code 'this'} instance */
        public int hashCode()
        {
            return
                    this.port
                +   Objects.hashCode(this.connectionId);
        }
    }
    
    
    // Counter for keeping the WebSocket Request ID's distinct.
    private static int counter = 1;
    
    /**
     * Request browser port binding.
     * 
     * @param port Port number to bind.
     * 
     * @return An instance of <CODE>{@link Script}&lt;String, {@link JsonObject},
     * {@link Ret0}&gt;</CODE>
     *
     * <BR /><BR />This {@code Script} instance must be <B STYLE='color:red'>executed</B> before the
     * browser receives the invocation-request.
     *
     * <BR /><BR />This Browser-Function <I>does not have</I> a return-value.  You may choose to
     * <B STYLE='color: red'>await</B> the {@link Promise}{@code <JsonObject,} {@link Ret0}
     * {@code >} to ensure the Browser Function has run to completion.
     */
    public static Script<String, JsonObject, Ret0> bind(int port)
    {
        final int       webSocketID = 40000000 + counter++;
        final boolean[] optionals   = { false, };
        
        // Convert Method Parameters into JSON.  Build the JSON Request-Object (as a String)
        String requestJSON = WriteJSON.get(
            parameterTypes.get("bind"),
            parameterNames.get("bind"),
            optionals, webSocketID,
            "Tethering.bind",
            port
        );
        
        // This Remote Command does not have a Return-Value.
        return new Script<>
            (BRDPC.defaultSender, webSocketID, requestJSON, BRDPC.NoReturnValues);
    }
    
    /**
     * Request browser port unbinding.
     * 
     * @param port Port number to unbind.
     * 
     * @return An instance of <CODE>{@link Script}&lt;String, {@link JsonObject},
     * {@link Ret0}&gt;</CODE>
     *
     * <BR /><BR />This {@code Script} instance must be <B STYLE='color:red'>executed</B> before the
     * browser receives the invocation-request.
     *
     * <BR /><BR />This Browser-Function <I>does not have</I> a return-value.  You may choose to
     * <B STYLE='color: red'>await</B> the {@link Promise}{@code <JsonObject,} {@link Ret0}
     * {@code >} to ensure the Browser Function has run to completion.
     */
    public static Script<String, JsonObject, Ret0> unbind(int port)
    {
        final int       webSocketID = 40001000 + counter++;
        final boolean[] optionals   = { false, };
        
        // Convert Method Parameters into JSON.  Build the JSON Request-Object (as a String)
        String requestJSON = WriteJSON.get(
            parameterTypes.get("unbind"),
            parameterNames.get("unbind"),
            optionals, webSocketID,
            "Tethering.unbind",
            port
        );
        
        // This Remote Command does not have a Return-Value.
        return new Script<>
            (BRDPC.defaultSender, webSocketID, requestJSON, BRDPC.NoReturnValues);
    }
    
}