mcdiscordbot/MinecraftDiscordBot/Services/PlayerDetectorService.cs

using Discord.WebSocket;
using MinecraftDiscordBot.Commands;
using MinecraftDiscordBot.Models;
using Newtonsoft.Json;

namespace MinecraftDiscordBot.Services;

public class PlayerDetectorService : CommandRouter {
    private readonly ITaskWaitSource _taskSource;
    public PlayerDetectorService(ITaskWaitSource taskSource) => _taskSource = taskSource;

    public override string HelpTextPrefix => "!pd ";
    public override Task<ResponseType> FallbackHandler(SocketUserMessage message, string method, string[] parameters, CancellationToken ct)
        => throw new ReplyException($"The player detector cannot do '{method}'!");

    private Task<T> Method<T>(string methodName, Func<string, T> parser, CancellationToken ct, Dictionary<string, object>? parameters = null)
        => RootCommandService.Method(_taskSource, methodName, parser, ct, parameters);

    public Task<string[]> GetOnlinePlayersAsync(CancellationToken ct) => Method("getonline", RootCommandService.Deserialize<string[]>(), ct);
    public async Task<PlayerPosition> GetPlayerPosition(string username, CancellationToken ct)
        => (await FindPlayerAsync(username, ct)) ?? throw new ReplyException($"User '{username}' is not online!");
    private Task<PlayerPosition?> FindPlayerAsync(string username, CancellationToken ct) => Method("whereis", i => JsonConvert.DeserializeObject<PlayerPosition?>(i), ct, new() {
        ["username"] = username
    });

    [CommandHandler("getonline", HelpText = "Get a list of online players.")]
    public async Task<ResponseType> HandleOnlinePlayers(SocketUserMessage message, string[] parameters, CancellationToken ct)
        => ResponseType.AsString($"The following players are currently online:\n{string.Join("\n", await GetOnlinePlayersAsync(ct))}");
    [CommandHandler("whereis", HelpText = "Find a player in the world.")]
    public async Task<ResponseType> HandleFindPlayers(SocketUserMessage message, string[] parameters, CancellationToken ct) {
        if (parameters is not { Length: 1 }) throw new ReplyException($"Give me only one username!");
        var username = parameters[0];
        var player = await FindPlayerAsync(username, ct);
        if (player is null) throw new ReplyException($"{username} is currently offline!");
        return ResponseType.AsString($"{username} is at coordinates {player.X} {player.Y} {player.Z} in dimension {player.Dimension}.");
    }
}