using System.Diagnostics;

namespace Aeshnidae.Invasions;

/// <summary>
/// The warning and the outcome, to Discord through the VPS's notify-discord.sh (the script
/// the ops tools use), on the channel key in Settings.Discord.Channel. No channel: logged
/// only - the default, so a staging server never posts where players read. Fire-and-forget
/// on the thread pool; the world thread never waits on Discord.
/// </summary>
public static class Discord
{
    public static string LastResult { get; private set; } = "never posted";

    public static void Post(string text)
    {
        var d = Mod.Settings.Discord;

        if (string.IsNullOrWhiteSpace(d.Channel))
        {
            LastResult = "no channel set - logged only";
            ModManager.Log($"[{Mod.Name}] Discord (no channel): {text.Replace('\n', ' ')}");
            return;
        }

        var script = (d.NotifyScript ?? "").Replace("~", Environment.GetFolderPath(Environment.SpecialFolder.UserProfile));

        if (string.IsNullOrWhiteSpace(script) || !File.Exists(script))
        {
            LastResult = $"notify script {script} not found - logged only";
            ModManager.Log($"[{Mod.Name}] Discord ({LastResult}): {text.Replace('\n', ' ')}");
            return;
        }

        _ = Task.Run(() =>
        {
            try
            {
                var psi = new ProcessStartInfo
                {
                    FileName = "/bin/bash",
                    UseShellExecute = false,
                    RedirectStandardOutput = true,
                    RedirectStandardError = true,
                };
                psi.ArgumentList.Add(script);
                psi.ArgumentList.Add(d.Channel);
                psi.ArgumentList.Add(text);

                using var proc = Process.Start(psi);
                if (proc is null)
                {
                    LastResult = "notify script did not start";
                }
                else
                {
                    proc.WaitForExit(20000);
                    LastResult = proc.ExitCode == 0
                        ? $"posted {DateTime.UtcNow:yyyy-MM-dd HH:mm} UTC ({d.Channel})"
                        : $"notify-discord.sh exited {proc.ExitCode}: {proc.StandardError.ReadToEnd().Trim()}";
                }
            }
            catch (Exception ex)
            {
                LastResult = $"notify script failed: {ex.Message}";
            }

            ModManager.Log($"[{Mod.Name}] Discord: {LastResult}");
        });
    }
}