[cm] greet new members & refactor rules

modules/ChatManagement/ChatManagement.cs

@@ -1,4 +1,6 @@
 using Kruzya.TelegramBot.Core;
+using Microsoft.Extensions.DependencyInjection;
+using West.TelegramBot.ChatManagement.Service;
 
 namespace West.TelegramBot.ChatManagement;
 
@@ -7,4 +9,9 @@ public class ChatManagement : Module
     public ChatManagement(Core core) : base(core)
     {
     }
+
+    public override void ConfigureServices(IServiceCollection services)
+    {
+        services.AddScoped<RulesService>();
+    }
 }

modules/ChatManagement/Handler/Greet.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using BotFramework;
+using BotFramework.Attributes;
+using BotFramework.Enums;
+using BotFramework.Utils;
+using Kruzya.TelegramBot.Core.Extensions;
+using Telegram.Bot;
+using Telegram.Bot.Types.Enums;
+using West.TelegramBot.ChatManagement.Service;
+
+namespace West.TelegramBot.ChatManagement.Handler;
+
+public class Greet : BotEventHandler
+{
+    private readonly RulesService _rulesService;
+
+    public Greet(RulesService rulesService)
+    {
+        _rulesService = rulesService;
+    }
+
+    [Message(InChat.Public, MessageFlag.HasNewChatMembers)]
+    public async Task HandleNewChatMembers()
+    {
+        var message = RawUpdate.Message!;
+        var members = message.NewChatMembers!;
+        var reply = new HtmlString();
+        string membersHtml;
+        if (members.Length > 1)
+        {
+            reply.Pre("Приветствуем новых участников!");
+            membersHtml = string.Join(", ", members.Select(u => u.ToHtml()));
+        }
+        else
+        {
+            reply.Pre("Приветствуем нового участника!");
+            membersHtml = members.First().ToHtml();
+        }
+
+        reply.Br().TextBr("{0}");
+
+        if (await _rulesService.HasRulesAsync(Chat))
+        {
+            reply.Text("Пожалуйста, ознакомьтесь с правилами. /rules");
+        }
+
+        await Bot.SendTextMessageAsync(Chat.Id, string.Format(reply.ToString(), membersHtml), 
+            ParseMode.Html, replyToMessageId: message.MessageId);
+    }
+}

modules/ChatManagement/Handler/Rules.cs

@@ -6,42 +6,48 @@ using Kruzya.TelegramBot.Core.Data;
 using Kruzya.TelegramBot.Core.Extensions;
 using Telegram.Bot;
 using Telegram.Bot.Exceptions;
+using West.TelegramBot.ChatManagement.Service;
 
 namespace West.TelegramBot.ChatManagement.Handler;
 
 class Rules : CommonHandler
 {
+    private readonly RulesService _rulesService;
+
     [Command(InChat.Public, "setrules", CommandParseMode.Both)]
     public async Task HandleSetRules()
     {
         var replyToMessage = Message?.ReplyToMessage;
 
-        if (replyToMessage == null || !await Bot.IsUserAdminAsync(Chat, From)) return;
+        if (replyToMessage == null || !await Bot.IsUserAdminAsync(Chat, From))
+        {
+            return;
+        }
 
-        var opt = await Db.UserValues.FindOrCreateOption(Chat.Id, "rulesMsgId");
-        opt.SetValue(replyToMessage.MessageId);
-        Db.AddOrUpdate(opt);
+        await _rulesService.SetRulesAsync(Chat, replyToMessage.MessageId);
     }
 
     [Command(InChat.Public, "rules", CommandParseMode.Both)]
     public async Task HandleRules()
     {
-        var opt = await Db.UserValues.FindOption(Chat.Id, "rulesMsgId");
-        if (opt == null)
+        if (!await _rulesService.HasRulesAsync(Chat))
         {
             return;
         }
 
         try
         {
-            await Bot.CopyMessageAsync(Chat.Id, Chat.Id, opt.GetValue<int>());
+            await Bot.CopyMessageAsync(Chat.Id, Chat.Id, await _rulesService.GetRulesMessageIdAsync(Chat) ?? 0);
         }
         catch (ApiRequestException)
         {
-            Db.UserValues.Remove(opt);
+            await _rulesService.RemoveChatRulesAsync(Chat);
             throw;
         }
     }
         
-    public Rules(CoreContext db) : base(db) {}
+    public Rules(CoreContext db, RulesService rulesService) : base(db)
+    {
+        _rulesService = rulesService;
+    }
 }

modules/ChatManagement/Service/RulesService.cs

@@ -0,0 +1,50 @@
+#nullable enable
+
+using System.Threading.Tasks;
+using Kruzya.TelegramBot.Core.Data;
+using Kruzya.TelegramBot.Core.Extensions;
+using Telegram.Bot.Types;
+
+namespace West.TelegramBot.ChatManagement.Service;
+
+public class RulesService
+{
+    private readonly CoreContext _db;
+
+    public RulesService(CoreContext db)
+    {
+        _db = db;
+    }
+
+    public async Task<BotUserValue?> GetRulesOptionAsync(Chat chat)
+    {
+        return await _db.UserValues.FindOption(chat.Id, "rulesMsgId");
+    }
+
+    public async Task<int?> GetRulesMessageIdAsync(Chat chat)
+    {
+        return (await GetRulesOptionAsync(chat))?.GetValue<int>();
+    }
+
+    public async Task<bool> HasRulesAsync(Chat chat)
+    {
+        return await GetRulesMessageIdAsync(chat) != null;
+    }
+
+    public async Task SetRulesAsync(Chat chat, int messageId)
+    {
+        var option = await GetRulesOptionAsync(chat) ?? _db.UserValues.Create();
+        option.SetValue(messageId);
+        _db.AddOrUpdate(option);
+    }
+
+    public async Task RemoveChatRulesAsync(Chat chat)
+    {
+        var option = await GetRulesOptionAsync(chat);
+        if (option == null)
+        {
+            return;
+        }
+        _db.Remove(option);
+    }
+}