Octobot/src/Services/Update/SongUpdateService.cs

using Microsoft.Extensions.Hosting;
using Remora.Discord.API.Abstractions.Objects;
using Remora.Discord.API.Gateway.Commands;
using Remora.Discord.API.Objects;
using Remora.Discord.Gateway;

namespace Octobot.Services.Update;

public sealed class SongUpdateService : BackgroundService
{
    private static readonly (string Name, TimeSpan Duration)[] SongList =
    {
        ("Yoko & the Gold Bazookas - Rockagilly Blues", new TimeSpan(0, 3, 37)),
        ("Splatoon 3 - Seep and Destroy", new TimeSpan(0, 2, 42)),
        ("Deep Cut - Big Betrayal", new TimeSpan(0, 1, 42)),
        ("Squid Sisters - Tomorrow's Nostalgia Today", new TimeSpan(0, 2, 8)),
        ("Deep Cut - Anarchy Rainbow", new TimeSpan(0, 1, 51)),
        ("Squid Sisters feat. Ian BGM - Liquid Sunshine", new TimeSpan(0, 1, 32)),
        ("Damp Socks feat. Off the Hook - Candy-Coated Rocks", new TimeSpan(0, 1, 11)),
        ("H2Whoa - Aquasonic", new TimeSpan(0, 1, 1)),
        ("Yoko & the Gold Bazookas - Ska-Blam!", new TimeSpan(0, 4, 4)),
        ("Off the Hook - Muck Warfare", new TimeSpan(0, 3, 39)),
        ("Off the Hook - Acid Hues", new TimeSpan(0, 3, 39)),
        ("Off the Hook - Shark Bytes", new TimeSpan(0, 3, 48)),
        ("DJ Octavio feat. Squid Sisters & Deep Cut - Calamari Inkantation", new TimeSpan(0, 7, 9)),
        ("Splatoon - Ink Me Up", new TimeSpan(0, 2, 13))
    };

    private readonly List<Activity> _activityList = new(1)
    {
        new Activity("with Remora.Discord", ActivityType.Game)
    };

    private readonly DiscordGatewayClient _client;
    private readonly GuildDataService _guildData;

    private uint _nextSongIndex;

    public SongUpdateService(DiscordGatewayClient client, GuildDataService guildData)
    {
        _client = client;
        _guildData = guildData;
    }

    protected override async Task ExecuteAsync(CancellationToken ct)
    {
        while (_guildData.GetGuildIds().Count is 0)
        {
            await Task.Delay(TimeSpan.FromSeconds(5), ct);
        }

        while (!ct.IsCancellationRequested)
        {
            var nextSong = SongList[_nextSongIndex];
            _activityList[0] = new Activity(nextSong.Name, ActivityType.Listening);
            _client.SubmitCommand(
                new UpdatePresence(
                    UserStatus.Online, false, DateTimeOffset.UtcNow, _activityList));
            _nextSongIndex++;
            if (_nextSongIndex >= SongList.Length)
            {
                _nextSongIndex = 0;
            }

            await Task.Delay(nextSong.Duration, ct);
        }
    }
}