// Copyright © 2017-2026 QL-Win Contributors
//
// This file is part of QuickLook program.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;

namespace QuickLook.Common.ExtensionMethods;

public static class FileExtensions
{
    public static string ToPrettySize(this long value, int decimalPlaces = 0)
    {
        const long OneKb = 1024L;
        const long OneMb = OneKb * 1024L;
        const long OneGb = OneMb * 1024L;
        const long OneTb = OneGb * 1024L;

        var asTb = Math.Round((double)value / OneTb, decimalPlaces);
        var asGb = Math.Round((double)value / OneGb, decimalPlaces);
        var asMb = Math.Round((double)value / OneMb, decimalPlaces);
        var asKb = Math.Round((double)value / OneKb, decimalPlaces);
        var chosenValue = asTb > 1
            ? $"{asTb} TB"
            : asGb > 1
                ? $"{asGb} GB"
                : asMb > 1
                    ? $"{asMb} MB"
                    : asKb > 1
                        ? $"{asKb} KB"
                        : $"{Math.Round((double)value, decimalPlaces)} bytes";

        return chosenValue;
    }
}