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/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.util;

import org.mule.api.MuleMessage;
import org.mule.api.MuleRuntimeException;
import org.mule.api.transport.PropertyScope;
import org.mule.config.i18n.CoreMessages;

import java.io.UnsupportedEncodingException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

/**
 * Useful methods for formatting message strings for logging or exceptions.
 */
// @ThreadSafe
public final class StringMessageUtils
{
    // The maximum number of Collection and Array elements used for messages
    public static final int MAX_ELEMENTS = 50;
    public static final int DEFAULT_MESSAGE_WIDTH = 80;

    /** Do not instanciate. */
    private StringMessageUtils ()
    {
        // no-op
    }

    public static String getFormattedMessage(String msg, Object[] arguments)
    {
        if (arguments != null)
        {
            for (int i = 0; i < arguments.length; i++)
            {
                arguments[i] = toString(arguments[i]);
            }
        }
        return MessageFormat.format(msg, arguments);
    }

    public static String getBoilerPlate(String message)
    {
        return getBoilerPlate(message, '*', DEFAULT_MESSAGE_WIDTH);
    }

    public static String getBoilerPlate(String message, char c, int maxlength)
    {
        List messages = Arrays.asList(new String[]{message});
        messages = new ArrayList(messages);
        return getBoilerPlate(messages, c, maxlength);
    }

    public static String getBoilerPlate(List messages, char c, int maxlength)
    {
        int size;
        StringBuilder buf = new StringBuilder(messages.size() * maxlength);
        int trimLength = maxlength - (c == ' ' ? 2 : 4);

        for (int i = 0; i < messages.size(); i++)
        {
            size = messages.get(i).toString().length();
            if (size > trimLength)
            {
                String temp = messages.get(i).toString();
                int k = i;
                int x;
                int len;
                messages.remove(i);
                while (temp.length() > 0)
                {
                    len = (trimLength <= temp.length() ? trimLength : temp.length());
                    String msg = temp.substring(0, len);
                    x = msg.indexOf(SystemUtils.LINE_SEPARATOR);

                    if (x > -1)
                    {
                        msg = msg.substring(0, x);
                        len = x + 1;
                    }
                    else
                    {
                        x = msg.lastIndexOf(' ');
                        if (x > -1 && len == trimLength)
                        {
                            msg = msg.substring(0, x);
                            len = x + 1;
                        }
                    }
                    if (msg.startsWith(" "))
                    {
                        msg = msg.substring(1);
                    }

                    temp = temp.substring(len);
                    messages.add(k, msg);
                    k++;
                }
            }
        }

        buf.append(SystemUtils.LINE_SEPARATOR);
        if (c != ' ')
        {
            buf.append(StringUtils.repeat(c, maxlength));
        }

        for (int i = 0; i < messages.size(); i++)
        {
            buf.append(SystemUtils.LINE_SEPARATOR);
            if (c != ' ')
            {
                buf.append(c);
            }
            buf.append(" ");
            buf.append(messages.get(i));

            String osEncoding = CharSetUtils.defaultCharsetName();
            int padding;
            try
            {
                padding = trimLength - messages.get(i).toString().getBytes(osEncoding).length;
            }
            catch (UnsupportedEncodingException ueex)
            {
                throw new MuleRuntimeException(CoreMessages.failedToConvertStringUsingEncoding(osEncoding), ueex);
            }
            if (padding > 0)
            {
                buf.append(StringUtils.repeat(' ', padding));
            }
            buf.append(' ');
            if (c != ' ')
            {
                buf.append(c);
            }
        }
        buf.append(SystemUtils.LINE_SEPARATOR);
        if (c != ' ')
        {
            buf.append(StringUtils.repeat(c, maxlength));
        }
        return buf.toString();
    }

    public static String truncate(String message, int length, boolean includeCount)
    {
        if (message == null)
        {
            return null;
        }
        if (message.length() <= length)
        {
            return message;
        }
        String result = message.substring(0, length) + "...";
        if (includeCount)
        {
            result += "[" + length + " of " + message.length() + "]";
        }
        return result;
    }

    public static byte[] getBytes(String string)
    {
        try
        {
            return string.getBytes(FileUtils.DEFAULT_ENCODING);
        }
        catch (UnsupportedEncodingException e)
        {
            // We can ignore this as the encoding is validated on start up
            return null;
        }
    }

    public static String getString(byte[] bytes, String encoding)
    {
        try
        {
            return new String(bytes, encoding);
        }
        catch (UnsupportedEncodingException e)
        {
            // We can ignore this as the encoding is validated on start up
            return null;
        }
    }

    /**
     * @see ArrayUtils#toString(Object, int)
     * @see CollectionUtils#toString(Collection, int)
     * @see MapUtils#toString(Map, boolean)
     */
    public static String toString(Object o)
    {
        if (o == null)
        {
            return "null";
        }
        else if (o instanceof Class)
        {
            return ((Class) o).getName();
        }
        else if (o instanceof Map)
        {
            return MapUtils.toString((Map) o, false);
        }
        else if (o.getClass().isArray())
        {
            return ArrayUtils.toString(o, MAX_ELEMENTS);
        }
        else if (o instanceof Collection)
        {
            return CollectionUtils.toString((Collection) o, MAX_ELEMENTS);
        }
        else
        {
            return o.toString();
        }
    }

    public static String headersToString(MuleMessage m)
    {
        if (m == null)
        {
            return null;
        }
        StringBuilder buf = new StringBuilder();
        buf.append(SystemUtils.LINE_SEPARATOR).append("Message properties:").append(SystemUtils.LINE_SEPARATOR);

        for (int i = 0; i < PropertyScope.ALL_SCOPES.length; i++)
        {
            PropertyScope scope = PropertyScope.ALL_SCOPES[i];
            try
            {
                Set