From 25d725e1b3f61c4e8a640c32c06fa41a3d9c035e Mon Sep 17 00:00:00 2001
From: Oliver Booth <me@olivr.me>
Date: Sat, 26 Aug 2023 21:31:29 +0100
Subject: [PATCH] feat: add /info command (resolves #2)

---
 VPLink/Commands/InfoCommand.cs    | 57 +++++++++++++++++++++++++++++
 VPLink/Program.cs                 |  2 +
 VPLink/Services/BotService.cs     | 61 +++++++++++++++++++++++++++++++
 VPLink/Services/DiscordService.cs |  1 +
 4 files changed, 121 insertions(+)
 create mode 100644 VPLink/Commands/InfoCommand.cs
 create mode 100644 VPLink/Services/BotService.cs

diff --git a/VPLink/Commands/InfoCommand.cs b/VPLink/Commands/InfoCommand.cs
new file mode 100644
index 0000000..6f34be0
--- /dev/null
+++ b/VPLink/Commands/InfoCommand.cs
@@ -0,0 +1,57 @@
+using System.Text;
+using Discord;
+using Discord.Interactions;
+using Discord.WebSocket;
+using VPLink.Services;
+
+namespace VPLink.Commands;
+
+/// <summary>
+///     Represents a class which implements the <c>info</c> command.
+/// </summary>
+internal sealed class InfoCommand : InteractionModuleBase<SocketInteractionContext>
+{
+    private readonly BotService _botService;
+    private readonly DiscordSocketClient _discordClient;
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="InfoCommand" /> class.
+    /// </summary>
+    /// <param name="botService">The bot service.</param>
+    /// <param name="discordClient"></param>
+    public InfoCommand(BotService botService, DiscordSocketClient discordClient)
+    {
+        _botService = botService;
+        _discordClient = discordClient;
+    }
+
+    [SlashCommand("info", "Displays information about the bot.")]
+    [RequireContext(ContextType.Guild)]
+    public async Task InfoAsync()
+    {
+        SocketGuildUser member = Context.Guild.GetUser(_discordClient.CurrentUser.Id);
+        string pencilVersion = _botService.Version;
+
+        SocketRole? highestRole = member.Roles.Where(r => r.Color != Color.Default).MaxBy(r => r.Position);
+
+        var embed = new EmbedBuilder();
+        embed.WithAuthor(member);
+        embed.WithColor(highestRole?.Color ?? Color.Default);
+        embed.WithThumbnailUrl(member.GetAvatarUrl());
+        embed.WithTitle($"VPLink v{pencilVersion}");
+        embed.WithDescription("Created by <@94248427663130624>, hosted [on GitHub](https://github.com/oliverbooth/VPLink).");
+        embed.AddField("Ping", $"{_discordClient.Latency} ms", true);
+        embed.AddField("Started", $"<t:{_botService.StartedAt.ToUnixTimeSeconds()}:R>", true);
+
+        var builder = new StringBuilder();
+        builder.AppendLine($"VPLink: {pencilVersion}");
+        builder.AppendLine($"Discord.Net: {_botService.DiscordNetVersion}");
+        builder.AppendLine($"VP#: {_botService.VpSharpVersion}");
+        builder.AppendLine($"CLR: {Environment.Version.ToString(3)}");
+        builder.AppendLine($"Host: {Environment.OSVersion}");
+
+        embed.AddField("Version", $"```\n{builder}\n```");
+
+        await RespondAsync(embed: embed.Build(), ephemeral: true).ConfigureAwait(false);
+    }
+}
diff --git a/VPLink/Program.cs b/VPLink/Program.cs
index 2cb9a15..621a79f 100644
--- a/VPLink/Program.cs
+++ b/VPLink/Program.cs
@@ -25,6 +25,8 @@ builder.Configuration.AddTomlFile("data/config.toml", true, true);
 builder.Logging.ClearProviders();
 builder.Logging.AddSerilog();
 
+builder.Services.AddHostedSingleton<BotService>();
+
 builder.Services.AddSingleton<VirtualParadiseClient>();
 builder.Services.AddSingleton<IConfigurationService, ConfigurationService>();
 
diff --git a/VPLink/Services/BotService.cs b/VPLink/Services/BotService.cs
new file mode 100644
index 0000000..52c558e
--- /dev/null
+++ b/VPLink/Services/BotService.cs
@@ -0,0 +1,61 @@
+using System.Reflection;
+using Discord.WebSocket;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using VpSharp;
+
+namespace VPLink.Services;
+
+internal sealed class BotService : BackgroundService
+{
+    private readonly ILogger<BotService> _logger;
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="BotService" /> class.
+    /// </summary>
+    /// <param name="logger">The logger.</param>
+    public BotService(ILogger<BotService> logger)
+    {
+        _logger = logger;
+        var attribute = typeof(BotService).Assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>();
+        Version = attribute?.InformationalVersion ?? "Unknown";
+
+        attribute = typeof(DiscordSocketClient).Assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>();
+        DiscordNetVersion = attribute?.InformationalVersion ?? "Unknown";
+
+        attribute = typeof(VirtualParadiseClient).Assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>();
+        VpSharpVersion = attribute?.InformationalVersion ?? "Unknown";
+    }
+
+    /// <summary>
+    ///     Gets the Discord.Net version.
+    /// </summary>
+    /// <value>The Discord.Net version.</value>
+    public string DiscordNetVersion { get; }
+
+    /// <summary>
+    ///     Gets the date and time at which the bot was started.
+    /// </summary>
+    /// <value>The start timestamp.</value>
+    public DateTimeOffset StartedAt { get; private set; }
+
+    /// <summary>
+    ///     Gets the bot version.
+    /// </summary>
+    /// <value>The bot version.</value>
+    public string Version { get; }
+
+    /// <summary>
+    ///     Gets the VP# version.
+    /// </summary>
+    /// <value>The VP# version.</value>
+    public string VpSharpVersion { get; }
+
+    /// <inheritdoc />
+    protected override Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        StartedAt = DateTimeOffset.UtcNow;
+        _logger.LogInformation("VPLink v{Version} is starting...", Version);
+        return Task.CompletedTask;
+    }
+}
diff --git a/VPLink/Services/DiscordService.cs b/VPLink/Services/DiscordService.cs
index 530bf02..1ba757d 100644
--- a/VPLink/Services/DiscordService.cs
+++ b/VPLink/Services/DiscordService.cs
@@ -44,6 +44,7 @@ internal sealed class DiscordService : BackgroundService
         _logger.LogInformation("Establishing relay");
 
         _logger.LogInformation("Adding command modules");
+        await _interactionService.AddModuleAsync<InfoCommand>(_serviceProvider).ConfigureAwait(false);
         await _interactionService.AddModuleAsync<WhoCommand>(_serviceProvider).ConfigureAwait(false);
 
         _discordClient.Ready += OnReady;