// 
// Copyright (c) 2004-2017 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions 
// are met:
// 
// * Redistributions of source code must retain the above copyright notice, 
//   this list of conditions and the following disclaimer. 
// 
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution. 
// 
// * Neither the name of Jaroslaw Kowalski nor the names of its 
//   contributors may be used to endorse or promote products derived from this
//   software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
// THE POSSIBILITY OF SUCH DAMAGE.
// 

namespace NLog.Internal
{
    using System;

    internal static class FormatHelper
    {
        /// <summary>
        /// Convert object to string
        /// </summary>
        /// <param name="o">value</param>
        /// <param name="formatProvider">format for conversion.</param>
        /// <returns></returns>
        /// <remarks>
        /// If <paramref name="formatProvider"/> is <c>null</c> and <paramref name="o"/> isn't a <see cref="string"/> already, then the <see cref="LogFactory"/> will get a locked by <see cref="LogManager.Configuration"/>
        /// </remarks>
        internal static string ConvertToString(object o, IFormatProvider formatProvider)
        {
            // if no IFormatProvider is specified, use the Configuration.DefaultCultureInfo value.
            if (formatProvider == null && !(o is string))
            {
                //variable so only 1 lock is needed
                //TODO this locks the configuration, which can lead to deadlocks.
                var loggingConfiguration = LogManager.Configuration;
                if (loggingConfiguration != null)
                    formatProvider = loggingConfiguration.DefaultCultureInfo;
            }

            return Convert.ToString(o, formatProvider);

        }
    }
}