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/**
 * COOS - Connected Objects Operating System (www.connectedobjects.org).
 *
 * Copyright (C) 2009 Telenor ASA and Tellu AS. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 *
 * You may also contact one of the following for additional information:
 * Telenor ASA, Snaroyveien 30, N-1331 Fornebu, Norway (www.telenor.no)
 * Tellu AS, Hagalokkveien 13, N-1383 Asker, Norway (www.tellu.no)
 */
package org.coos.messaging;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.coos.messaging.COContainer;

import org.coos.util.macro.MacroSubstituteReader;


/**
 * Base class with default implementation of the COContainer interface.
 *
 * @author Robert Bjærum, Tellu AS
 *
 */
public class BaseCOContainer implements COContainer {
    public static final String COOS_CONFIG_PATH = "/org/coos/config";
    public final static String DEFAULT_COOS_CONFIG_DIR = "./coosConfig";
    protected String configDir = DEFAULT_COOS_CONFIG_DIR;

    public String getConfigDir() {
        return configDir;
    }

    public void setConfigDir(String configDir) {
        this.configDir = configDir;
    }

    public Object getObject(String name) {
        return null;
    }

    /**
     * Return resource as Stream.
     * 
     * The resource name will be attempted resolved as follows. A baseName is formed following the same
     * rule as for Class.getResourceAsStream(), removing any "/" prefix.
     * 

     * 1. First, try File("./", baseName)
     * 

     * 2. Then, try File(configDir, baseName)
     * 

     * 3. Then, try getResourceAsStream(resourceName)
     * 

     * 4. Then, try getResourceAsStream(COOS_CONFIG_PATH and try the resulting path name.
     * 
     * 5. If failed, throw IOException
     *
     * @param resourceName complete path to resource or base name of resource
     * @throws IOException if resource get fails
     * @see Class
     */
    public InputStream getResource(String resourceName) throws IOException {
        InputStream is = null;
        String baseName;

        if (resourceName.isEmpty()) {
            return null;
        }

        if (resourceName.startsWith("/")) {
            baseName = resourceName.substring(1);
        } else {
            baseName = resourceName;
            resourceName = "/" + resourceName;
        }

        try {
            File file = new File(".", baseName);
            is = file.toURI().toURL().openStream();
            is = substitute(is);

            if (is != null) {
                return is;
            }
        } catch (Exception ignore) {
        }

        try {
            File file = new File(configDir, baseName);
            is = file.toURI().toURL().openStream();
            is = substitute(is);

            if (is != null) {
                return is;
            }
        } catch (Exception ignore) {
        }

        try {
            is = this.getClass().getResourceAsStream(resourceName);
            is = substitute(is);

            if (is != null) {
                return is;
            }
        } catch (Exception ignore) {
        }

        is = this.getClass().getResourceAsStream(COOS_CONFIG_PATH + resourceName);
        is = substitute(is);

        return is;
    }

    @SuppressWarnings("unchecked")
    public Class loadClass(String className) throws ClassNotFoundException {
        return Class.forName(className);
    }

    protected InputStream substitute(InputStream is) throws IOException {

        if (is == null) {
            throw new IOException("Inputstream cannot be null");
        }

        InputStreamReader isr = new InputStreamReader(is);
        MacroSubstituteReader msr = new MacroSubstituteReader(isr);
        String substituted = msr.substituteMacros();
        is = new ByteArrayInputStream(substituted.getBytes());

        return is;
    }

    @Override public void start() throws Exception {
        // TODO Auto-generated method stub

    }

    @Override public void stop() throws Exception {
        // TODO Auto-generated method stub

    }

}