#region
/* -----------------------------------------------------------------------
 * <copyright file="SizeExtensions.cs" company="GRNet">
 * 
 * Copyright 2011-2012 GRNET S.A. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 *   1. Redistributions of source code must retain the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer.
 *
 *   2. 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.
 *
 *
 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``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 GRNET S.A 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
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 * -----------------------------------------------------------------------
 */
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Pithos.Client.WPF.FileProperties
{
    public static class SizeExtensions
    {


        static readonly string[] SizeSuffixes = { 
        "B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };

        public static string ToByteSize(this long size)
        {

            const string formatTemplate = "{0}{1:0.#} {2}";

            if (size == 0)
            {
                return string.Format(formatTemplate, null, 0, SizeSuffixes[0]);
            }

            var absSize = Math.Abs((double)size);
            var fpPower = Math.Log(absSize, 1000);
            var intPower = (int)fpPower;
            var iUnit = intPower >= SizeSuffixes.Length
                ? SizeSuffixes.Length - 1
                : intPower;
            var normSize = absSize / Math.Pow(1000, iUnit);

            return string.Format(
                formatTemplate,
                size < 0 ? "-" : null, normSize, SizeSuffixes[iUnit]);
        } 

    }
}