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package Torello.JSON;

import Torello.Java.Additional.Counter;
import Torello.Java.Function.IntIntTConsumer;


import java.util.function.Consumer;
import java.util.function.ObjIntConsumer;
import javax.json.JsonValue;

public class ACCEPTOR<T>
{
    private final Counter acceptCounter = new Counter(0);

    private final T                 defaultValue;
    private final ObjIntConsumer<T> MAIN_ACCEPTOR;

    void accept(final T t, final int jsonArrayIndex)
    { MAIN_ACCEPTOR.accept(t, jsonArrayIndex); }

    void reset()
    { this.acceptCounter.set(0); }

    int retrieveCount()
    { return this.acceptCounter.size(); }

    ACCEPTOR(final SETTINGS_REC_BUILDER<T, ?> b)
    {
        super();

        this.defaultValue = b.defaultValue;
    
        final Consumer<T>           oneArgAcceptor      = b.oneArgAcceptor();
        final IntIntTConsumer<T>    threeArgAcceptor    = b.threeArgAcceptor();

        if (    (oneArgAcceptor != null)
            &&  (threeArgAcceptor != null)
        )
            throw new RJArrSettingsError(
                "The ACCEPTOR constructor seems to have been invoked with two non-null user " +
                "consumers.  It is expected that the ACCEPTOR constructor be invoked with " +
                "precisely 1 user based consumer."
            );

        if (oneArgAcceptor != null) this.MAIN_ACCEPTOR =
            (final T t, int jsonArrayIndex) ->
                oneArgAcceptor.accept(t);

        else if (threeArgAcceptor != null) this.MAIN_ACCEPTOR =
            (final T t, int jsonArrayIndex) ->
                threeArgAcceptor.accept(jsonArrayIndex, this.acceptCounter.addOne(), t);

        else throw new RJArrSettingsError(
            "While building the ACCEPTOR, there doesn't appear to be a non-null consumer.  It " +
            "is expected that the ACCEPTOR constructor be invoked with precisely 1 user based " +
            "consumer."
        );
    }

    void AN(int i)      { MAIN_ACCEPTOR.accept(null, i); }
    void AD(int i)      { MAIN_ACCEPTOR.accept(defaultValue, i); }
    void NOOP(int i)    { }

    void AN(JsonValue jv, int i)    { MAIN_ACCEPTOR.accept(null, i); }
    void AD(JsonValue jv, int i)    { MAIN_ACCEPTOR.accept(defaultValue, i); }
    void NOOP(JsonValue jv, int i)  { }
}