using System;
using System.Text;
using Microsoft.Extensions.Logging;
using Xunit.Abstractions;

namespace BTCPayServer.Tests.Logging
{
    public interface ILog
    {
        void LogInformation(string msg);
    }

    public class XUnitLogProvider : ILoggerProvider
    {
        readonly ITestOutputHelper _Helper;
        public XUnitLogProvider(ITestOutputHelper helper)
        {
            _Helper = helper;
        }
        public ILogger CreateLogger(string categoryName)
        {
            return new XUnitLog(_Helper) { Name = categoryName };
        }

        public void Dispose()
        {

        }
    }
    public class XUnitLog : ILog, ILogger, IDisposable
    {
        readonly ITestOutputHelper _Helper;
        public XUnitLog(ITestOutputHelper helper)
        {
            _Helper = helper;
        }

        public string Name
        {
            get; set;
        }

        public IDisposable BeginScope<TState>(TState state)
        {
            return this;
        }

        public void Dispose()
        {

        }

        public bool IsEnabled(LogLevel logLevel)
        {
            return true;
        }

        public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
        {
            StringBuilder builder = new StringBuilder();
            builder.Append(formatter(state, exception));
            if (exception != null)
            {
                builder.AppendLine();
                builder.Append(exception.ToString());
            }
            LogInformation(builder.ToString());
        }

        public void LogInformation(string msg)
        {
            if (msg != null)
                try
                {
                    _Helper.WriteLine(DateTimeOffset.UtcNow + " :" + Name + ":   " + msg);
                }
                catch { }
        }
    }
}