using System;
using System.Collections.Generic;

/// <summary>
/// Single switch for the per-request chatter the patch used to print on every
/// login (the [Net], [Connection], [Auth], [HttpStatus] and per-connection [TLS]
/// lines). It is OFF by default: the log now carries patch status and real
/// problems only. Set RADICADE_DIAG=1 to get the full trace back when something
/// needs diagnosing.
/// </summary>
internal static class Diag
{
    internal static readonly bool Verbose = ReadFlag("RADICADE_DIAG");

    private static readonly object Gate = new object();
    private static readonly HashSet<string> Seen = new HashSet<string>(StringComparer.Ordinal);

    internal static bool ReadFlag(string name)
    {
        try
        {
            var raw = Environment.GetEnvironmentVariable(name);
            if (string.IsNullOrWhiteSpace(raw)) return false;
            var value = raw.Trim().ToLowerInvariant();
            return !(value == "0" || value == "off" || value == "false" || value == "no");
        }
        catch
        {
            return false;
        }
    }

    /// <summary>Per-request tracing: printed only with RADICADE_DIAG=1.</summary>
    internal static void Trace(string message)
    {
        if (!Verbose) return;
        Info(message);
    }

    internal static void Info(string message)
    {
        try { RadicadeEacBypassPlugin.LogSource.LogInfo(message); } catch { }
    }

    internal static void Warn(string message)
    {
        try { RadicadeEacBypassPlugin.LogSource.LogWarning(message); } catch { }
    }

    internal static void Error(string message)
    {
        try { RadicadeEacBypassPlugin.LogSource.LogError(message); } catch { }
    }

    /// <summary>True the first time this key is seen in the session.</summary>
    internal static bool FirstTime(string key)
    {
        try
        {
            lock (Gate) return Seen.Add(key);
        }
        catch
        {
            return false;
        }
    }
}