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Forest-of-actors runtime supporting real-time systems and real-time recoding - bringing aspects of Erlang, Smalltalk and Extempore to Java.
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2018 Neil C Smith.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 Lesser General Public License
 * version 3 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License version 3
 * along with this work; if not, see http://www.gnu.org/licenses/
 *
 *
 * Please visit https://www.praxislive.org if you need additional information or
 * have any questions.
 */
package org.praxislive.code;

import java.lang.reflect.Field;
import org.praxislive.code.userapi.AuxIn;
import org.praxislive.code.userapi.In;
import org.praxislive.code.userapi.Input;
import org.praxislive.core.Port;
import org.praxislive.core.PortInfo;
import org.praxislive.core.types.PString;
import org.praxislive.core.Value;
import org.praxislive.core.services.LogLevel;

/**
 *
 * 
 */
class InputImpl extends Input {
    
    private CodeContext context;
    
    @Override
    protected void attach(CodeContext context) {
        super.attach(context);
        this.context = context;
    }

    private void update(long time, double value) {
        context.invoke(time, () -> updateLinks(value));
    }
    
    private void update(long time, Value value) {
        context.invoke(time, () -> updateLinks(value));
    }
    
    static Descriptor createDescriptor(CodeConnector connector,
            In ann, Field field) {
        return createDescriptor(connector, PortDescriptor.Category.In, ann.value(), field);
    }

    static Descriptor createDescriptor(CodeConnector connector,
            AuxIn ann, Field field) {
        return createDescriptor(connector, PortDescriptor.Category.AuxIn, ann.value(), field);
    }
    
    private static Descriptor createDescriptor(CodeConnector connector,
            PortDescriptor.Category category, int index, Field field) {
        if (!Input.class.isAssignableFrom(field.getType())) {
            return null;
        }
        String id = connector.findID(field);
        return new Descriptor(id, category, index, field);
    }
    
    static class Descriptor extends PortDescriptor 
            implements ControlInput.Link {

        private final Field field;
        private final InputImpl input;
        private ControlInput port;

        private Descriptor(String id, Category category, int index, Field field) {
            super(id, category, index);
            this.input = new InputImpl();
            this.field = field;
        }
        
        @Override
        public void attach(CodeContext context, Port previous) {
            if (previous instanceof ControlInput) {
                port = (ControlInput) previous;
                port.setLink(this);
            } else {
                if (previous != null) {
                    previous.disconnectAll();
                }
                port = new ControlInput(this);
            }
            try {
                field.setAccessible(true);
                field.set(context.getDelegate(), input);
            } catch (Exception ex) {
                context.getLog().log(LogLevel.ERROR, ex);
            }
            input.attach(context);
        }

        @Override
        public void reset(boolean full) {
            input.clearLinks();
        }

        @Override
        public Port getPort() {
            return port;
        }

        @Override
        public PortInfo getInfo() {
            return ControlInput.INFO;
        }

        @Override
        public void receive(long time, double value) {
            input.update(time, value);
        }

        @Override
        public void receive(long time, Value value) {
            Value v = value instanceof Value ? (Value) value : PString.of(value);
            input.update(time, v);
        }
        
    }
}