/******************************************************************************
* Copyright (C) 2005-2013  Fabio Zadrozny and others
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
*     Fabio Zadrozny <fabiofz@gmail.com>    - initial API and implementation
*     Jonah Graham <jonah@kichwacoders.com> - ongoing maintenance
******************************************************************************/
package org.python.pydev.ui.pythonpathconf;

import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.core.runtime.CoreException;
import org.python.pydev.core.log.Log;
import org.python.pydev.runners.SimpleRunner;
import org.python.pydev.shared_core.string.StringUtils;

public class JythonInterpreterProviderFactory extends AbstractInterpreterProviderFactory {

    @Override
    public IInterpreterProvider[] getInterpreterProviders(InterpreterType type) {
        if (type != IInterpreterProviderFactory.InterpreterType.JYTHON) {
            return null;
        }

        Set<String> pathsToSearch = new LinkedHashSet<String>();
        try {
            Map<String, String> env = SimpleRunner.getDefaultSystemEnv(null);
            if (env.containsKey("JYTHON_HOME")) {
                pathsToSearch.add(env.get("JYTHON_HOME"));
            }
            if (env.containsKey("PYTHON_HOME")) {
                pathsToSearch.add(env.get("PYTHON_HOME"));
            }
            if (env.containsKey("JYTHONHOME")) {
                pathsToSearch.add(env.get("JYTHONHOME"));
            }
            if (env.containsKey("PYTHONHOME")) {
                pathsToSearch.add(env.get("PYTHONHOME"));
            }
            if (env.containsKey("PATH")) {
                String path = env.get("PATH");
                String separator = SimpleRunner.getPythonPathSeparator();
                final List<String> split = StringUtils.split(path, separator);
                pathsToSearch.addAll(split);
            }
        } catch (CoreException e) {
            Log.log(e);
        }
        pathsToSearch.add("/usr/share/java");
        pathsToSearch.add("/usr/bin");
        pathsToSearch.add("/usr/local/bin");

        String[] searchResults = searchPaths(pathsToSearch, Arrays.asList("jython.jar"));
        if (searchResults.length > 0) {
            return AlreadyInstalledInterpreterProvider.create("jython", searchResults);
        }

        return null;
    }

}