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

using System.Diagnostics;
using System.IO;

namespace Microsoft.AspNetCore.Razor.Language.Legacy
{
    public static class BaselineWriter
    {
        private static object baselineLock = new object();

        [Conditional("GENERATE_BASELINES")]
        public static void WriteBaseline(string baselineFile, string output)
        {
            var root = RecursiveFind("Razor.sln", Path.GetFullPath("."));
            var baselinePath = Path.Combine(root, baselineFile);

            // Serialize writes to minimize contention for file handles and directory access.
            lock (baselineLock)
            {
                // Update baseline
                using (var stream = File.Open(baselinePath, FileMode.Create, FileAccess.Write))
                {
                    using (var writer = new StreamWriter(stream))
                    {
                        writer.Write(output);
                    }
                }
            }
        }

        private static string RecursiveFind(string path, string start)
        {
            var test = Path.Combine(start, path);
            if (File.Exists(test))
            {
                return start;
            }
            else
            {
                return RecursiveFind(path, new DirectoryInfo(start).Parent.FullName);
            }
        }
    }
}