WorldTime/Commands/CommandsBase.cs

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using Discord.Interactions;
using NodaTime;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Text;
using WorldTime.Data;
namespace WorldTime.Commands;
public class CommandsBase : InteractionModuleBase<ShardedInteractionContext> {
protected const string ErrInvalidZone = ":x: Not a valid zone name."
+ " To find your time zone, refer to: <https://kevinnovak.github.io/Time-Zone-Picker/>.";
protected const string ErrNoUserCache = ":warning: Please try the command again.";
protected const string ErrNotAllowed = ":x: Only server moderators may use this command.";
private static readonly ReadOnlyDictionary<string, string> _tzNameMap;
static CommandsBase() {
Dictionary<string, string> tzNameMap = new(StringComparer.OrdinalIgnoreCase);
foreach (var name in DateTimeZoneProviders.Tzdb.Ids) tzNameMap.Add(name, name);
_tzNameMap = new(tzNameMap);
}
public DiscordShardedClient ShardedClient { get; set; } = null!;
public BotDatabaseContext DbContext { get; set; } = null!;
/// <summary>
/// Returns a string displaying the current time in the given time zone.
/// The result begins with six numbers for sorting purposes. Must be trimmed before output.
/// </summary>
protected static string TzPrint(string zone, bool use12hr) {
var tzdb = DateTimeZoneProviders.Tzdb;
DateTimeZone tz = tzdb.GetZoneOrNull(zone)!;
if (tz == null) throw new Exception("Encountered unknown time zone: " + zone);
var now = SystemClock.Instance.GetCurrentInstant().InZone(tz);
var sortpfx = now.ToString("MMddHH", DateTimeFormatInfo.InvariantInfo);
string fullstr;
if (use12hr) {
var ap = now.ToString("tt", DateTimeFormatInfo.InvariantInfo).ToLowerInvariant();
fullstr = now.ToString($"MMM' 'dd', 'hh':'mm'{ap} 'x' (UTC'o<g>')'", DateTimeFormatInfo.InvariantInfo);
} else fullstr = now.ToString("dd'-'MMM', 'HH':'mm' 'x' (UTC'o<g>')'", DateTimeFormatInfo.InvariantInfo);
return $"{sortpfx}● `{fullstr}`";
}
/// <summary>
/// Checks given time zone input. Returns a valid string for use with NodaTime, or null.
/// </summary>
protected static string? ParseTimeZone(string tzinput) {
if (tzinput.Equals("Asia/Calcutta", StringComparison.OrdinalIgnoreCase)) tzinput = "Asia/Kolkata";
if (_tzNameMap.TryGetValue(tzinput, out var name)) return name;
return null;
}
/// <summary>
/// Formats a user's name to a consistent, readable format which makes use of their nickname.
/// </summary>
protected static string FormatName(SocketGuildUser user) {
static string escapeFormattingCharacters(string input) {
var result = new StringBuilder();
foreach (var c in input) {
if (c is '\\' or '_' or '~' or '*' or '@') {
result.Append('\\');
}
result.Append(c);
}
return result.ToString();
}
var username = escapeFormattingCharacters(user.Username);
if (user.Nickname != null) {
return $"**{escapeFormattingCharacters(user.Nickname)}** ({username}#{user.Discriminator})";
}
return $"**{username}**#{user.Discriminator}";
}
/// <summary>
/// Checks if the member cache for the specified guild needs to be filled, and sends a request if needed.
/// </summary>
/// <remarks>
/// Due to a quirk in Discord.Net, the user cache cannot be filled until the command handler is no longer executing
/// regardless of if the request runs on its own thread, thus requiring the user to run the command again.
/// </remarks>
/// <returns>
/// True if the guild's members are already downloaded. If false, the command handler must notify the user.
/// </returns>
protected static async Task<bool> AreUsersDownloadedAsync(SocketGuild guild) {
static bool HasMostMembersDownloaded(SocketGuild guild) {
if (guild.HasAllMembers) return true;
if (guild.MemberCount > 30) {
// For guilds of size over 30, require 85% or more of the members to be known
// (26/30, 42/50, 255/300, etc)
return guild.DownloadedMemberCount >= (int)(guild.MemberCount * 0.85);
} else {
// For smaller guilds, fail if two or more members are missing
return guild.MemberCount - guild.DownloadedMemberCount <= 2;
}
}
if (HasMostMembersDownloaded(guild)) return true;
else {
// Event handler hangs if awaited normally or used with Task.Run
await Task.Factory.StartNew(guild.DownloadUsersAsync).ConfigureAwait(false);
return false;
}
}
}