using System;
using System.IO;
using System.Text;
using Server.Accounting;

namespace Server.Commands
{
  public class CommandLogging
  {
    private static char[] m_NotSafe = { '\\', '/', ':', '*', '?', '"', '<', '>', '|' };
    public static bool Enabled{ get; set; } = true;

    public static StreamWriter Output{ get; private set; }

    public static void Initialize()
    {
      EventSink.Command += EventSink_Command;

      if (!Directory.Exists("Logs"))
        Directory.CreateDirectory("Logs");

      string directory = "Logs/Commands";

      if (!Directory.Exists(directory))
        Directory.CreateDirectory(directory);

      try
      {
        Output = new StreamWriter(Path.Combine(directory, $"{DateTime.UtcNow.ToLongDateString()}.log"), true);

        Output.AutoFlush = true;

        Output.WriteLine("##############################");
        Output.WriteLine("Log started on {0}", DateTime.UtcNow);
        Output.WriteLine();
      }
      catch
      {
        // ignored
      }
    }

    public static object Format(object o)
    {
      if (o is Mobile m)
      {
        if (m.Account == null)
          return $"{m} (no account)";

        return $"{m} ('{m.Account.Username}')";
      }

      if (o is Item item) return $"0x{item.Serial.Value:X} ({item.GetType().Name})";

      return o;
    }

    public static void WriteLine(Mobile from, string format, params object[] args)
    {
      if (!Enabled)
        return;

      WriteLine(from, string.Format(format, args));
    }

    public static void WriteLine(Mobile from, string text)
    {
      if (!Enabled)
        return;

      try
      {
        Output.WriteLine("{0}: {1}: {2}", DateTime.UtcNow, from.NetState, text);

        string path = Core.BaseDirectory;

        string name = !(from.Account is Account acct) ? from.Name : acct.Username;

        AppendPath(ref path, "Logs");
        AppendPath(ref path, "Commands");
        AppendPath(ref path, from.AccessLevel.ToString());
        path = Path.Combine(path, $"{name}.log");

        using (StreamWriter sw = new StreamWriter(path, true))
        {
          sw.WriteLine("{0}: {1}: {2}", DateTime.UtcNow, from.NetState, text);
        }
      }
      catch
      {
        // ignored
      }
    }

    public static void AppendPath(ref string path, string toAppend)
    {
      path = Path.Combine(path, toAppend);

      if (!Directory.Exists(path))
        Directory.CreateDirectory(path);
    }

    public static string Safe(string ip)
    {
      if (ip == null)
        return "null";

      ip = ip.Trim();

      if (ip.Length == 0)
        return "empty";

      bool isSafe = true;

      for (int i = 0; isSafe && i < m_NotSafe.Length; ++i)
        isSafe = ip.IndexOf(m_NotSafe[i]) == -1;

      if (isSafe)
        return ip;

      StringBuilder sb = new StringBuilder(ip);

      for (int i = 0; i < m_NotSafe.Length; ++i)
        sb.Replace(m_NotSafe[i], '_');

      return sb.ToString();
    }

    public static void EventSink_Command(CommandEventArgs e)
    {
      WriteLine(e.Mobile, "{0} {1} used command '{2} {3}'", e.Mobile.AccessLevel, Format(e.Mobile), e.Command,
        e.ArgString);
    }

    public static void LogChangeProperty(Mobile from, object o, string name, string value)
    {
      WriteLine(from, "{0} {1} set property '{2}' of {3} to '{4}'", from.AccessLevel, Format(from), name, Format(o),
        value);
    }
  }
}