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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.util.Arrays;
import java.util.List;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;

import io.soluble.pjb.bridge.Util;

/**
 * Create a standalone PHP script engines.
 */
public class PhpScriptEngineFactory implements ScriptEngineFactory {

    protected class Factory {
        protected boolean hasCloseable;

        public Factory(boolean hasCloseable) {
            this.hasCloseable = hasCloseable;
        }

        public ScriptEngine create() {
            if (hasCloseable) {
                return new CloseablePhpScriptEngine(PhpScriptEngineFactory.this);
            } else {
                return new PhpScriptEngine(PhpScriptEngineFactory.this);
            }
        }
    }

    protected Factory factory;

    /**
     * Create a new EngineFactory
     */
    public PhpScriptEngineFactory() {
        try {
            Class.forName("java.io.Closeable");
            factory = new Factory(true);
        } catch (ClassNotFoundException e) {
            factory = new Factory(false);
        }
    }

    private static final String ENGINE_NAME = Util.EXTENSION_NAME + " php script engine for Java";

    /**
     * {@inheritDoc}
     */
    public String getEngineName() {
        return ENGINE_NAME;
    }

    /**
     * {@inheritDoc}
     */
    public String getEngineVersion() {
        return Util.VERSION;
    }

    /**
     * {@inheritDoc}
     */
    public String getLanguageName() {
        return "php";
    }

    /**
     * {@inheritDoc}
     */
    public String getLanguageVersion() {
        return "6";
    }

    /**
     * {@inheritDoc}
     */
    public List getExtensions() {
        return getNames();
    }

    /**
     * {@inheritDoc}
     */
    public List getMimeTypes() {
        return Arrays.asList(new String[]{});
    }

    List names;

    /**
     * {@inheritDoc}
     */
    public List getNames() {
        if (names == null) names = Arrays.asList(new String[]{getLanguageName(), "phtml", "php4", "php5", "php6"});
        return names;
    }

    /**
     * {@inheritDoc}
     */
    public ScriptEngine getScriptEngine() {
        return factory.create();
    }

    /**
     * {@inheritDoc}
     */
    public Object getParameter(String key) {
        if (key.equals("javax.script.name"))
            return getLanguageName();
        if (key.equals("javax.script.engine"))
            return getEngineName();
        if (key.equals("javax.script.engine_version"))
            return getEngineVersion();
        if (key.equals("javax.script.language"))
            return getLanguageName();
        if (key.equals("javax.script.language_version"))
            return getLanguageVersion();
        if (key.equals("THREADING"))
            return "STATELESS";
        else
            throw new IllegalArgumentException("key");
    }

    /**
     * {@inheritDoc}
     */
    public String getMethodCallSyntax(String obj, String m, String[] args) {
        StringBuffer b = new StringBuffer();
        b.append("$");
        b.append(obj);
        b.append("->");
        b.append(m);
        b.append("(");
        int i;
        for (i = 0; i < args.length - 1; i++) {
            b.append(args[i]);
            b.append(",");
        }
        b.append(args[i]);
        b.append(")");
        return b.toString();
    }

    /**
     * {@inheritDoc}
     */
    public String getOutputStatement(String toDisplay) {
        return "echo(" + toDisplay + ")";
    }

    /**
     * {@inheritDoc}
     */
    public String getProgram(String[] statements) {
        int i = 0;
        StringBuffer b = new StringBuffer("");
        return b.toString();
    }
}