/**
 * Copyright (c) 2005-2013 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the Eclipse Public License (EPL).
 * Please see the license.txt included with this distribution for details.
 * Any modifications to this file must keep this entire header intact.
 */
package org.python.pydev.debug.core;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Platform;
import org.osgi.framework.Bundle;
import org.python.pydev.core.log.Log;
import org.python.pydev.shared_core.io.FileUtils;
import org.python.pydev.shared_core.string.StringUtils;

/**
 * This file contains utility methods for File read / write / append
 * 
 * @author hussain.bohra
 * @author Fabio Zadrozny
 */
public class ConfigureExceptionsFileUtils {

    public static String DELIMITER = ";";

    /**
     * Only static methods (no need to instance it).
     */
    private ConfigureExceptionsFileUtils() {

    }

    /**
     * Creates a new file if isAppend is false, else appends data in the
     * existing file.
     */
    public static void writeToFile(String fileName, String pyExceptionsStr, boolean isAppend) {
        IPath path = getFilePathFromMetadata(fileName);
        try {
            FileOutputStream fstream = new FileOutputStream(path.toFile(), isAppend);
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fstream, StandardCharsets.UTF_8);
            BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
            bufferedWriter.write(pyExceptionsStr);
            bufferedWriter.close();
        } catch (IOException e) {
            Log.log(e);
        }
    }

    /**
     * Read the data from the file and returns in the string format
     */
    public static String readFromMetadataFile(String fileName) {
        IPath filePathFromWorkSpace = getFilePathFromMetadata(fileName);
        File file = filePathFromWorkSpace.toFile();

        if (file.exists()) {
            return FileUtils.getFileContentsCustom(file, "utf-8", String.class).toString();
        }

        return "";
    }

    /**
     * Split the string received from the file read by the delimiter and
     * returns the list
     */
    public static List<String> getConfiguredExceptions(String fileName) {
        String pyExceptionStr = readFromMetadataFile(fileName);
        if (pyExceptionStr.length() > 0) {
            return StringUtils.split(pyExceptionStr, DELIMITER);
        }
        return new ArrayList<String>();
    }

    /**
     * Construct the file path existing in the workspace under
     * <workspace>/.metadata/plugins/org.python.pydev
     */
    public static IPath getFilePathFromMetadata(String fileName) {
        Bundle bundle = Platform.getBundle("org.python.pydev");
        IPath path = Platform.getStateLocation(bundle);
        path = path.addTrailingSeparator().append(fileName);
        return path;
    }
}