Show an error when entering the same value from the settings

TeamOctolings.Octobot/Commands/SettingsCommandGroup.cs

@@ -202,6 +202,27 @@ private async Task<Result> EditSettingAsync(
         IGuildOption option, string value, GuildData data, Snowflake channelId, IUser executor, IUser bot,
         CancellationToken ct = default)
     {
+        var equalsResult = option.ValueEquals(data.Settings, value);
+        if (!equalsResult.IsSuccess)
+        {
+            var failedEmbed = new EmbedBuilder().WithSmallTitle(Messages.SettingNotChanged, bot)
+                .WithDescription(equalsResult.Error.Message)
+                .WithColour(ColorsList.Red)
+                .Build();
+
+            return await _feedback.SendContextualEmbedResultAsync(failedEmbed, ct: ct);
+        }
+
+        if (equalsResult.Entity)
+        {
+            var failedEmbed = new EmbedBuilder().WithSmallTitle(Messages.SettingNotChanged, bot)
+                .WithDescription(Messages.SettingValueEquals)
+                .WithColour(ColorsList.Red)
+                .Build();
+
+            return await _feedback.SendContextualEmbedResultAsync(failedEmbed, ct: ct);
+        }
+
         var setResult = option.Set(data.Settings, value);
         if (!setResult.IsSuccess)
         {

TeamOctolings.Octobot/Data/Options/BoolOption.cs

@@ -12,6 +12,16 @@ public override string Display(JsonNode settings)
         return Get(settings) ? Messages.Yes : Messages.No;
     }
 
+    public override Result<bool> ValueEquals(JsonNode settings, string value)
+    {
+        if (!TryParseBool(value, out var boolean))
+        {
+            return new ArgumentInvalidError(nameof(value), Messages.InvalidSettingValue);
+        }
+
+        return Value(settings).Equals(boolean.ToString());
+    }
+
     public override Result Set(JsonNode settings, string from)
     {
         if (!TryParseBool(from, out var value))

TeamOctolings.Octobot/Data/Options/GuildOption.cs

@@ -21,9 +21,19 @@ public GuildOption(string name, T defaultValue)
 
     public string Name { get; }
 
+    protected virtual string Value(JsonNode settings)
+    {
+        return Get(settings).ToString() ?? throw new InvalidOperationException();
+    }
+
     public virtual string Display(JsonNode settings)
     {
-        return Markdown.InlineCode(Get(settings).ToString() ?? throw new InvalidOperationException());
+        return Markdown.InlineCode(Value(settings));
+    }
+
+    public virtual Result<bool> ValueEquals(JsonNode settings, string value)
+    {
+        return Value(settings).Equals(value);
     }
 
     /// <summary>

TeamOctolings.Octobot/Data/Options/IGuildOption.cs

@@ -7,6 +7,7 @@ public interface IGuildOption
 {
     string Name { get; }
     string Display(JsonNode settings);
+    Result<bool> ValueEquals(JsonNode settings, string value);
     Result Set(JsonNode settings, string from);
     Result Reset(JsonNode settings);
 }

TeamOctolings.Octobot/Data/Options/LanguageOption.cs

@@ -1,6 +1,5 @@
 using System.Globalization;
 using System.Text.Json.Nodes;
-using Remora.Discord.Extensions.Formatting;
 using Remora.Results;
 
 namespace TeamOctolings.Octobot.Data.Options;
@@ -16,9 +15,9 @@ public sealed class LanguageOption : GuildOption<CultureInfo>
 
     public LanguageOption(string name, string defaultValue) : base(name, CultureInfoCache[defaultValue]) { }
 
-    public override string Display(JsonNode settings)
+    protected override string Value(JsonNode settings)
     {
-        return Markdown.InlineCode(settings[Name]?.GetValue<string>() ?? "en");
+        return settings[Name]?.GetValue<string>() ?? "en";
     }
 
     /// <inheritdoc />

TeamOctolings.Octobot/Data/Options/TimeSpanOption.cs

@@ -8,6 +8,16 @@ public sealed class TimeSpanOption : GuildOption<TimeSpan>
 {
     public TimeSpanOption(string name, TimeSpan defaultValue) : base(name, defaultValue) { }
 
+    public override Result<bool> ValueEquals(JsonNode settings, string value)
+    {
+        if (!TimeSpanParser.TryParse(value).IsDefined(out var span))
+        {
+            return new ArgumentInvalidError(nameof(value), Messages.InvalidSettingValue);
+        }
+
+        return Value(settings).Equals(span.ToString());
+    }
+
     public override TimeSpan Get(JsonNode settings)
     {
         var property = settings[Name];

TeamOctolings.Octobot/Messages.resx

@@ -681,4 +681,7 @@
     <data name="SettingsModeratorRole" xml:space="preserve">
       <value>Moderator role</value>
   </data>
+  <data name="SettingValueEquals" xml:space="preserve">
+      <value>The setting value is the same as the input value.</value>
+  </data>
 </root>

TeamOctolings.Octobot/Messages.ru.resx

@@ -681,4 +681,7 @@
     <data name="SettingsModeratorRole" xml:space="preserve">
       <value>Роль модератора</value>
   </data>
+  <data name="SettingValueEquals" xml:space="preserve">
+      <value>Значение настройки такое же, как и вводное значение.</value>
+  </data>
 </root>