using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Logging.Console;

namespace TuringMachine.Server;

/// <summary>
/// Custom log formatter that outputs a minimal timestamp + level + message format.
/// </summary>
public sealed class MinimalConsoleFormatter : ConsoleFormatter
{
    public MinimalConsoleFormatter() : base("minimal") { }

    public override void Write<TState>(
        in LogEntry<TState> logEntry,
        IExternalScopeProvider? scopeProvider,
        TextWriter textWriter)
    {
        string? message = logEntry.Formatter?.Invoke(logEntry.State, logEntry.Exception);
        if (message == null) return;

        string timestamp = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss.fffzzz");
        string logLevel = logEntry.LogLevel.ToString().ToLower();

        textWriter.WriteLine($"{timestamp} {logLevel}: {message}");
    }
}