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/*-*- mode: Java; tab-width:8 -*-*/

package io.soluble.pjb.script;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

import java.io.IOException;

import javax.script.Bindings;
import javax.script.Invocable;
import javax.script.ScriptContext;
import javax.script.ScriptException;

import io.soluble.pjb.bridge.Util;
import io.soluble.pjb.bridge.http.IContext;

/**
 * A convenience variant of the PHP script engine which can be used interactively.
 * Example:
 * 
 * ScriptEngine e = (new ScriptEngineManager()).getEngineByName("php-interactive);

 * e.eval("$v = 1+2"); 

 * System.out.println(e.eval("echo $v")); 

 * e.eval((String)null);

 * 
 *
 * @author jostb
 */
public class InteractivePhpScriptEngine extends InvocablePhpScriptEngine {

    private static final String restoreState = "" +
            "$javabridge_values=unserialize(java_values(java_context()->getAttribute('io.soluble.pjb.bridge.JAVABRIDGE_TMP_VALUES', 100)));" +
            "if($javabridge_values)" +
            "foreach ($javabridge_values as $javabridge_key=>$javabridge_val) " +
            "{eval(\"\\$$javabridge_key=\\$javabridge_values[\\$javabridge_key];\");}\n";
    private static final String saveState = "" +
            "foreach (get_defined_vars() as $javabridge_key=>$javabridge_val) " +
            "{if(in_array($javabridge_key, $javabridge_ignored_keys)) continue;" +
            "eval(\"\\$javabridge_values[\\$javabridge_key]=\\$$javabridge_key;\");};" +
            "java_context()->setAttribute('io.soluble.pjb.bridge.JAVABRIDGE_TMP_VALUES', serialize($javabridge_values), 100);\n";


    public InteractivePhpScriptEngine() {
        super(new InteractivePhpScriptEngineFactory());
    }

    /**
     * Create the interactive php script engine.
     *
     * @param factory The engine factory
     */
    public InteractivePhpScriptEngine(InteractivePhpScriptEngineFactory factory) {
        super(factory);
    }

    /**
     * Create a new ScriptEngine with bindings.
     *
     * @param n the bindings
     */
    public InteractivePhpScriptEngine(Bindings n) {
        this();
        setBindings(n, ScriptContext.ENGINE_SCOPE);
    }

    boolean hasScript = false;
    /* (non-Javadoc)
     * @see javax.script.ScriptEngine#eval(java.lang.String, javax.script.ScriptContext)
     */

    /**
     * Evaluate a PHP line.
     *
     * @param script  The script line
     * @param context The context
     * @return The result
     * @throws ScriptException
     */
    public Object eval(String script, ScriptContext context)
            throws ScriptException {
        if (script == null) {
            release();
            return null;
        }

        if (!hasScript) {
            super.eval("", context);
            hasScript = true;
        }
        script = script.trim() + ";";
        Object o = null;
        try {
            o = ((Invocable) this).invokeFunction("javabridge_eval", new Object[]{script});
        } catch (NoSuchMethodException ex) {
        /*ignore*/
        } finally {
            try {
                context.getWriter().flush();
            } catch (IOException e) {
                Util.printStackTrace(e);
            }
            try {
                context.getErrorWriter().flush();
            } catch (IOException e) {
                Util.printStackTrace(e);
            }
        }

        return o;
    }

    /**
     * {@inheritDoc}
     */
    public void release() {
        super.release();
        hasScript = false;
    }

    /**
     * Create a new context ID and a environment map which we send to the client.
     */
    protected void addNewContextFactory() {
        ctx = InteractivePhpScriptContextFactory.addNew((IContext) getContext());
    }
}