Implemented polls (#116)

* Initial poll implementation

* Added entity extensions. Added poll prefix to method name

* Added poll dispatch handlers

* Added poll permissions

* Added REST error codes

* Added poll intents

* Added poll gateway events

* Implemented local poll CreateFrom methods.

src/Disqord.Abstractions/Client/DiscordClientBase.Events.cs

@@ -383,6 +383,20 @@ public event AsynchronousEventHandler<StageDeletedEventArgs> StageDeleted
         remove => GatewayClient.StageDeleted -= value;
     }
 
+    /// <inheritdoc/>
+    public event AsynchronousEventHandler<PollVoteAddedEventArgs> PollVoteAdded
+    {
+        add => GatewayClient.PollVoteAdded += value;
+        remove => GatewayClient.PollVoteAdded -= value;
+    }
+
+    /// <inheritdoc/>
+    public event AsynchronousEventHandler<PollVoteRemovedEventArgs> PollVoteRemoved
+    {
+        add => GatewayClient.PollVoteRemoved += value;
+        remove => GatewayClient.PollVoteRemoved -= value;
+    }
+
     /// <inheritdoc/>
     public event AsynchronousEventHandler<TypingStartedEventArgs> TypingStarted
     {

src/Disqord.Core/Discord/Limits/Rest/Discord.Limits.Rest.cs

@@ -63,6 +63,11 @@ public static class Rest
             ///     Represents the page size for fetching event users.
             /// </summary>
             public const int FetchGuildEventUsersPageSize = 100;
+
+            /// <summary>
+            ///     Represents the page size for fetching poll answer voters.
+            /// </summary>
+            public const int FetchPollAnswerVotersPageSize = 100;
         }
     }
 }

src/Disqord.Core/Entities/Core/Message/User/IUserMessage.cs

@@ -113,4 +113,9 @@ public interface IUserMessage : IMessage
     ///     Gets the stickers sent with this message.
     /// </summary>
     IReadOnlyList<IMessageSticker> Stickers { get; }
+
+    /// <summary>
+    ///     Gets the poll of this message.
+    /// </summary>
+    IPoll? Poll { get; }
 }

src/Disqord.Core/Entities/Core/Message/User/Poll/IPoll.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+
+namespace Disqord;
+
+/// <summary>
+///     Represents a poll.
+/// </summary>
+public interface IPoll : IEntity
+{
+    /// <summary>
+    ///     Gets the question of this poll.
+    /// </summary>
+    IPollMedia Question { get; }
+
+    /// <summary>
+    ///     Gets the answers of this poll.
+    /// </summary>
+    IReadOnlyList<IPollAnswer> Answers { get; }
+
+    /// <summary>
+    ///     Gets the expiry of this poll.
+    /// </summary>
+    DateTimeOffset? Expiry { get; }
+
+    /// <summary>
+    ///     Gets whether this poll allows selection of multiple answers.
+    /// </summary>
+    bool AllowMultiselect { get; }
+
+    /// <summary>
+    ///     Gets the layout type of this poll.
+    /// </summary>
+    PollLayoutType LayoutType { get; }
+
+    /// <summary>
+    ///     Gets the results of this poll.
+    /// </summary>
+    IPollResults? Results { get; }
+}

src/Disqord.Core/Entities/Core/Message/User/Poll/IPollAnswer.cs

@@ -0,0 +1,17 @@
+namespace Disqord;
+
+/// <summary>
+///     Represents a poll answer.
+/// </summary>
+public interface IPollAnswer : IEntity
+{
+    /// <summary>
+    ///     Gets the ID of the poll answer. This is used to match <see cref="IPollAnswerCount"/> based on the ID.
+    /// </summary>
+    int Id { get; }
+
+    /// <summary>
+    ///     Gets the media of this poll answer.
+    /// </summary>
+    IPollMedia Media { get; }
+}

src/Disqord.Core/Entities/Core/Message/User/Poll/IPollAnswerCount.cs

@@ -0,0 +1,22 @@
+namespace Disqord;
+
+/// <summary>
+///     Represents the vote count of a poll answer.
+/// </summary>
+public interface IPollAnswerCount : IEntity
+{
+    /// <summary>
+    ///     Gets the ID of the poll answer.
+    /// </summary>
+    int AnswerId { get; }
+
+    /// <summary>
+    ///     Gets the amount of users that selected the poll answer.
+    /// </summary>
+    int Count { get; }
+
+    /// <summary>
+    ///     Gets whether the bot has selected the poll answer.
+    /// </summary>
+    bool HasOwnVote { get; }
+}

src/Disqord.Core/Entities/Core/Message/User/Poll/IPollMedia.cs

@@ -0,0 +1,17 @@
+namespace Disqord;
+
+/// <summary>
+///     Represents poll media.
+/// </summary>
+public interface IPollMedia : IEntity
+{
+    /// <summary>
+    ///     Gets the text of this poll media.
+    /// </summary>
+    string? Text { get; }
+
+    /// <summary>
+    ///     Gets the emoji of this poll media.
+    /// </summary>
+    IEmoji? Emoji { get; }
+}

src/Disqord.Core/Entities/Core/Message/User/Poll/IPollResults.cs

@@ -0,0 +1,19 @@
+using System.Collections.Generic;
+
+namespace Disqord;
+
+/// <summary>
+///     Represents the results of a poll.
+/// </summary>
+public interface IPollResults : IEntity
+{
+    /// <summary>
+    ///     Gets whether the votes have been precisely counted.
+    /// </summary>
+    bool IsFinalized { get; }
+
+    /// <summary>
+    ///     Gets the vote counts of each answer.
+    /// </summary>
+    IReadOnlyList<IPollAnswerCount> AnswerCounts { get; }
+}

src/Disqord.Core/Entities/Local/Message/Extensions/LocalMessageBaseExtensions.cs

@@ -147,4 +147,11 @@ public static TMessage WithStickerIds<TMessage>(this TMessage message, params Sn
     {
         return message.WithStickerIds(stickerIds as IEnumerable<Snowflake>);
     }
+
+    public static TMessage WithPoll<TMessage>(this TMessage message, LocalPoll poll)
+        where TMessage : LocalMessageBase
+    {
+        message.Poll = poll;
+        return message;
+    }
 }

src/Disqord.Core/Entities/Local/Message/LocalMessageBase.cs

@@ -51,6 +51,11 @@ public abstract class LocalMessageBase : ILocalConstruct<LocalMessageBase>
     /// </summary>
     public Optional<IList<Snowflake>> StickerIds { get; set; }
 
+    /// <summary>
+    ///     Gets or sets the poll of this message.
+    /// </summary>
+    public Optional<LocalPoll> Poll { get; set; }
+
     /// <summary>
     ///     Instantiates a new <see cref="LocalMessageBase"/>.
     /// </summary>
@@ -71,6 +76,7 @@ protected LocalMessageBase(LocalMessageBase other)
         Attachments = other.Attachments.DeepClone();
         Components = other.Components.DeepClone();
         StickerIds = other.StickerIds.Clone();
+        Poll = other.Poll.Clone();
     }
 
     public abstract LocalMessageBase Clone();

src/Disqord.Core/Entities/Local/Message/Poll/Extensions/LocalPollAnswerExtensions.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel;
+
+namespace Disqord;
+
+[EditorBrowsable(EditorBrowsableState.Never)]
+public static class LocalPollAnswerExtensions
+{
+    public static TPollAnswer WithMedia<TPollAnswer>(this TPollAnswer answer, LocalPollMedia media)
+        where TPollAnswer : LocalPollAnswer
+    {
+        answer.Media = media;
+        return answer;
+    }
+}

src/Disqord.Core/Entities/Local/Message/Poll/Extensions/LocalPollExtensions.cs

@@ -0,0 +1,91 @@
+using System.Collections.Generic;
+using System.ComponentModel;
+using Qommon;
+
+namespace Disqord;
+
+[EditorBrowsable(EditorBrowsableState.Never)]
+public static class LocalPollExtensions
+{
+    public static TPoll WithQuestion<TPoll>(this TPoll poll, string text)
+        where TPoll : LocalPoll
+    {
+        var media = new LocalPollMedia()
+        {
+            Text = text
+        };
+
+        return poll.WithQuestion(media);
+    }
+
+    public static TPoll WithQuestion<TPoll>(this TPoll poll, LocalPollMedia question)
+        where TPoll : LocalPoll
+    {
+        poll.Question = question;
+        return poll;
+    }
+
+    public static TPoll AddAnswer<TPoll>(this TPoll poll, string text, LocalEmoji? emoji = null)
+        where TPoll : LocalPoll
+    {
+        var media = new LocalPollMedia
+        {
+            Text = text,
+            Emoji = Optional.FromNullable(emoji)
+        };
+
+        var answer = new LocalPollAnswer()
+        {
+            Media = media
+        };
+
+        return poll.AddAnswer(answer);
+    }
+
+    public static TPoll AddAnswer<TPoll>(this TPoll poll, LocalPollAnswer answer)
+        where TPoll : LocalPoll
+    {
+        if (poll.Answers.Add(answer, out var list))
+            poll.Answers = new(list);
+
+        return poll;
+    }
+
+    public static TPoll WithAnswers<TPoll>(this TPoll poll, IEnumerable<LocalPollAnswer> answers)
+        where TPoll : LocalPoll
+    {
+        Guard.IsNotNull(answers);
+
+        if (poll.Answers.With(answers, out var list))
+            poll.Answers = new(list);
+
+        return poll;
+    }
+
+    public static TPoll WithAnswers<TPoll>(this TPoll poll, params LocalPollAnswer[] answers)
+        where TPoll : LocalPoll
+    {
+        return poll.WithAnswers(answers as IEnumerable<LocalPollAnswer>);
+    }
+
+    public static TPoll WithDuration<TPoll>(this TPoll poll, int duration)
+        where TPoll : LocalPoll
+    {
+        poll.Duration = duration;
+        return poll;
+    }
+
+    public static TPoll WithAllowMultiselect<TPoll>(this TPoll poll, bool allowMultiselect = true)
+        where TPoll : LocalPoll
+    {
+        poll.AllowMultiselect = allowMultiselect;
+        return poll;
+    }
+
+    public static TPoll WithLayoutType<TPoll>(this TPoll poll, PollLayoutType layoutType)
+        where TPoll : LocalPoll
+    {
+        poll.LayoutType = layoutType;
+        return poll;
+    }
+}

src/Disqord.Core/Entities/Local/Message/Poll/Extensions/LocalPollMediaExtensions.cs

@@ -0,0 +1,21 @@
+using System.ComponentModel;
+
+namespace Disqord;
+
+[EditorBrowsable(EditorBrowsableState.Never)]
+public static class LocalPollMediaExtensions
+{
+    public static TPollMedia WithText<TPollMedia>(this TPollMedia media, string text)
+        where TPollMedia : LocalPollMedia
+    {
+        media.Text = text;
+        return media;
+    }
+
+    public static TPollMedia WithEmoji<TPollMedia>(this TPollMedia media, LocalEmoji emoji)
+        where TPollMedia : LocalPollMedia
+    {
+        media.Emoji = emoji;
+        return media;
+    }
+}