Switch to Remora.Discord (#41)

result checks go brrr

this also involves switching to using Discord's modern stuff like embeds
and interactions

and using brand-new for me programming concepts (dependency injection,
results)

---------

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>
Signed-off-by: mctaylors <95250141+mctaylors@users.noreply.github.com>
Co-authored-by: mctaylors <95250141+mctaylors@users.noreply.github.com>
Co-authored-by: nrdk <neroduck@vk.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Commands/ClearCommandGroup.cs

@@ -0,0 +1,120 @@
+using System.ComponentModel;
+using System.Text;
+using Boyfriend.Services;
+using Remora.Commands.Attributes;
+using Remora.Commands.Groups;
+using Remora.Discord.API.Abstractions.Objects;
+using Remora.Discord.API.Abstractions.Rest;
+using Remora.Discord.Commands.Attributes;
+using Remora.Discord.Commands.Conditions;
+using Remora.Discord.Commands.Contexts;
+using Remora.Discord.Commands.Feedback.Services;
+using Remora.Discord.Extensions.Embeds;
+using Remora.Discord.Extensions.Formatting;
+using Remora.Rest.Core;
+using Remora.Results;
+
+// ReSharper disable ClassNeverInstantiated.Global
+// ReSharper disable UnusedMember.Global
+
+namespace Boyfriend.Commands;
+
+/// <summary>
+///     Handles the command to clear messages in a channel: /clear.
+/// </summary>
+public class ClearCommandGroup : CommandGroup {
+    private readonly IDiscordRestChannelAPI _channelApi;
+    private readonly ICommandContext        _context;
+    private readonly GuildDataService       _dataService;
+    private readonly FeedbackService        _feedbackService;
+    private readonly IDiscordRestUserAPI    _userApi;
+
+    public ClearCommandGroup(
+        IDiscordRestChannelAPI channelApi,      ICommandContext     context, GuildDataService dataService,
+        FeedbackService        feedbackService, IDiscordRestUserAPI userApi) {
+        _channelApi = channelApi;
+        _context = context;
+        _dataService = dataService;
+        _feedbackService = feedbackService;
+        _userApi = userApi;
+    }
+
+    /// <summary>
+    ///     A slash command that clears messages in the channel it was executed.
+    /// </summary>
+    /// <param name="amount">The amount of messages to clear.</param>
+    /// <returns>
+    ///     A feedback sending result which may or may not have succeeded. A successful result does not mean that any messages
+    ///     were cleared and vice-versa.
+    /// </returns>
+    [Command("clear", "очистить")]
+    [RequireContext(ChannelContext.Guild)]
+    [RequireDiscordPermission(DiscordPermission.ManageMessages)]
+    [RequireBotDiscordPermissions(DiscordPermission.ManageMessages)]
+    [Description("Remove multiple messages")]
+    public async Task<Result> ClearMessagesAsync(
+        [Description("Number of messages to remove (2-100)")] [MinValue(2)] [MaxValue(100)]
+        int amount) {
+        if (!_context.TryGetContextIDs(out var guildId, out var channelId, out var userId))
+            return Result.FromError(
+                new ArgumentNullError(nameof(_context), "Unable to retrieve necessary IDs from command context"));
+
+        var messagesResult = await _channelApi.GetChannelMessagesAsync(
+            channelId.Value, limit: amount + 1, ct: CancellationToken);
+        if (!messagesResult.IsDefined(out var messages))
+            return Result.FromError(messagesResult);
+
+        var cfg = await _dataService.GetConfiguration(guildId.Value, CancellationToken);
+        Messages.Culture = cfg.GetCulture();
+
+        var idList = new List<Snowflake>(messages.Count);
+        var builder = new StringBuilder().AppendLine(Mention.Channel(channelId.Value)).AppendLine();
+        for (var i = messages.Count - 1; i >= 1; i--) { // '>= 1' to skip last message ('Boyfriend is thinking...')
+            var message = messages[i];
+            idList.Add(message.ID);
+            builder.AppendLine(string.Format(Messages.MessageFrom, Mention.User(message.Author)));
+            builder.Append(message.Content.InBlockCode());
+        }
+
+        var description = builder.ToString();
+
+        var userResult = await _userApi.GetUserAsync(userId.Value, CancellationToken);
+        if (!userResult.IsDefined(out var user))
+            return Result.FromError(userResult);
+
+        var deleteResult = await _channelApi.BulkDeleteMessagesAsync(
+            channelId.Value, idList, user.GetTag().EncodeHeader(), CancellationToken);
+        if (!deleteResult.IsSuccess)
+            return Result.FromError(deleteResult.Error);
+
+        // The current user's avatar is used when sending messages
+        var currentUserResult = await _userApi.GetCurrentUserAsync(CancellationToken);
+        if (!currentUserResult.IsDefined(out var currentUser))
+            return Result.FromError(currentUserResult);
+
+        var title = string.Format(Messages.MessagesCleared, amount.ToString());
+        if (cfg.PrivateFeedbackChannel is not 0 && cfg.PrivateFeedbackChannel != channelId.Value) {
+            var logEmbed = new EmbedBuilder().WithSmallTitle(title, currentUser)
+                .WithDescription(description)
+                .WithActionFooter(user)
+                .WithCurrentTimestamp()
+                .WithColour(ColorsList.Red)
+                .Build();
+
+            if (!logEmbed.IsDefined(out var logBuilt))
+                return Result.FromError(logEmbed);
+
+            // Not awaiting to reduce response time
+            if (cfg.PrivateFeedbackChannel != channelId.Value)
+                _ = _channelApi.CreateMessageAsync(
+                    cfg.PrivateFeedbackChannel.ToDiscordSnowflake(), embeds: new[] { logBuilt },
+                    ct: CancellationToken);
+        }
+
+        var embed = new EmbedBuilder().WithSmallTitle(title, currentUser)
+            .WithColour(ColorsList.Green).Build();
+        if (!embed.IsDefined(out var built)) return Result.FromError(embed);
+
+        return (Result)await _feedbackService.SendContextualEmbedAsync(built, ct: CancellationToken);
+    }
+}