// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System;
using System.Diagnostics;
using System.Threading;
 
namespace Microsoft.CodeAnalysis.Internal.Log
{
    /// <summary>
    /// Implementation of <see cref="ILogger"/> that produce timing debug output. 
    /// </summary>
    internal sealed class TraceLogger : ILogger
    {
        public static readonly TraceLogger Instance = new(isEnabledPredicate: null);
 
        private readonly Func<FunctionId, bool>? _isEnabledPredicate;
 
        public TraceLogger(Func<FunctionId, bool>? isEnabledPredicate)
            => _isEnabledPredicate = isEnabledPredicate;
 
        public bool IsEnabled(FunctionId functionId)
            => _isEnabledPredicate == null || _isEnabledPredicate(functionId);
 
        public void Log(FunctionId functionId, LogMessage logMessage)
            => Trace.WriteLine(string.Format("[{0}] {1} - {2}", Environment.CurrentManagedThreadId, functionId.ToString(), logMessage.GetMessage()));
 
        public void LogBlockStart(FunctionId functionId, LogMessage logMessage, int uniquePairId, CancellationToken cancellationToken)
            => Trace.WriteLine(string.Format("[{0}] Start({1}) : {2} - {3}", Environment.CurrentManagedThreadId, uniquePairId, functionId.ToString(), logMessage.GetMessage()));
 
        public void LogBlockEnd(FunctionId functionId, LogMessage logMessage, int uniquePairId, int delta, CancellationToken cancellationToken)
        {
            var functionString = functionId.ToString() + (cancellationToken.IsCancellationRequested ? " Canceled" : string.Empty);
            Trace.WriteLine(string.Format("[{0}] End({1}) : [{2}ms] {3}", Environment.CurrentManagedThreadId, uniquePairId, delta, functionString));
        }
    }
}