// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System.Threading.Tasks;

namespace Microsoft.AspNet.StaticFiles
{
    internal static class Constants
    {
        internal const string ServerCapabilitiesKey = "server.Capabilities";
        internal const string SendFileVersionKey = "sendfile.Version";
        internal const string SendFileVersion = "1.0";

        internal const string Location = "Location";
        internal const string IfMatch = "If-Match";
        internal const string IfNoneMatch = "If-None-Match";
        internal const string IfModifiedSince = "If-Modified-Since";
        internal const string IfUnmodifiedSince = "If-Unmodified-Since";
        internal const string IfRange = "If-Range";
        internal const string Range = "Range";
        internal const string ContentRange = "Content-Range";
        internal const string LastModified = "Last-Modified";
        internal const string ETag = "ETag";

        internal const string HttpDateFormat = "r";

        internal const string TextHtmlUtf8 = "text/html; charset=utf-8";

        internal const int Status200Ok = 200;
        internal const int Status206PartialContent = 206;
        internal const int Status304NotModified = 304;
        internal const int Status412PreconditionFailed = 412;
        internal const int Status416RangeNotSatisfiable = 416;

        internal static readonly Task CompletedTask = CreateCompletedTask();

        private static Task CreateCompletedTask()
        {
            var tcs = new TaskCompletionSource<object>();
            tcs.SetResult(null);
            return tcs.Task;
        }
    }
}