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/*
 * Copyright (c) 2000, 2020, Oracle and/or its affiliates.
 *
 * Licensed under the Universal Permissive License v 1.0 as shown at
 * http://oss.oracle.com/licenses/upl.
 */
package com.tangosol.util.extractor;

import com.tangosol.internal.util.graal.ScriptManager;

import com.tangosol.io.ExternalizableLite;

import com.tangosol.io.pof.PofReader;
import com.tangosol.io.pof.PofWriter;
import com.tangosol.io.pof.PortableObject;

import com.tangosol.util.ExternalizableHelper;
import com.tangosol.util.ValueExtractor;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import org.graalvm.polyglot.Value;

/**
 * ScriptValueExtractor is an {@link AbstractExtractor} that wraps a script
 * written in one of the languages supported by Graal VM.
 *
 * @param   the type of the value to extract from
 * @param   the type of value that will be extracted
 *
 * @author mk 2019.07.26
 * @since 14.1.1.0
 */
public class ScriptValueExtractor
        extends AbstractExtractor
        implements ExternalizableLite, PortableObject
    {
    // ------ constructors ---------------------------------------------------

    /**
     * Default constructor for deserialization.
     */
    public ScriptValueExtractor()
        {
        }

    /**
     * Create a {@link ValueExtractor} that wraps the specified script.
     *
     * @param sLanguage  the language the script is written
     * @param sName      the name of the {@link ValueExtractor} that needs to
     *                   be evaluated
     * @param aoArgs     the arguments to be passed to the script during
     *                   evaluation
     */
    public ScriptValueExtractor(String sLanguage, String sName, Object... aoArgs)
        {
        m_sLanguage = sLanguage;
        m_sName     = sName;
        m_aoArgs    = aoArgs;
        }

    // ----- ValueExtractor interface ----------------------------------------

    @Override
    @SuppressWarnings("unchecked")
    public E extract(T target)
        {
        Value value = ScriptManager.getInstance()
                                   .execute(m_sLanguage, m_sName, m_aoArgs);

        return (E) value.as(ValueExtractor.class).extract(target);
        }

    // ----- ExternalizableLite interface ------------------------------------

    @Override
    public void readExternal(DataInput in) throws IOException
        {
        m_sLanguage = in.readUTF();
        m_sName     = in.readUTF();
        m_aoArgs    = ExternalizableHelper.readObject(in);
        }

    @Override
    public void writeExternal(DataOutput out) throws IOException
        {
        out.writeUTF(m_sLanguage);
        out.writeUTF(m_sName);
        ExternalizableHelper.writeObject(out, m_aoArgs);
        }

    // ----- PortableObject interface ----------------------------------------

    @Override
    public void readExternal(PofReader in) throws IOException
        {
        m_sLanguage = in.readString(0);
        m_sName     = in.readString(1);
        m_aoArgs    = in.readArray(2, Object[]::new);
        }

    @Override
    public void writeExternal(PofWriter out) throws IOException
        {
        out.writeString(0, m_sLanguage);
        out.writeString(1, m_sName);
        out.writeObjectArray(2, m_aoArgs);
        }

    // ----- data members ---------------------------------------------------

    /**
     * The language the script is written.
     */
    private String m_sLanguage;

    /**
     * The name of the {@link ValueExtractor} to execute.
     */
    private String m_sName;

    /**
     * The arguments to be passed to the script during evaluation.
     */
    private Object[] m_aoArgs;
    }