initial chat options implementation

Core/Options/DbOptionProvider.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Reflection;
+using System.Threading.Tasks;
+using Kruzya.TelegramBot.Core.Data;
+using Kruzya.TelegramBot.Core.Extensions;
+
+namespace Kruzya.TelegramBot.Core.Options;
+
+public class DbOptionProvider : IOptionProvider
+{
+    private readonly CoreContext _db;
+
+    public DbOptionProvider(CoreContext db)
+    {
+        _db = db;
+    }
+
+    public async Task<TValue> GetValueAsync<TOption, TValue>(long chatId)
+    {
+        return await GetValueAsync(
+            chatId, 
+            GetOptionId<TOption>(), 
+            GetDefaultValue<TOption, TValue>()
+        );
+    }
+
+    public async Task<TValue> GetValueAsync<TValue>(long chatId, string optionId, TValue defVal)
+    {
+        return (await _db.ChatOptionValues.FindOrCreateOption(chatId, optionId)).GetValue(defVal);
+    }
+
+    public async Task SetValueAsync<TOption, TValue>(long chatId, TValue value)
+    {
+        var chatOption = await _db.ChatOptionValues.FindOrCreateOption(chatId, GetOptionId<TOption>());
+        chatOption.SetValue(value);
+        _db.AddOrUpdate(chatOption);
+    }
+
+    protected OptionAttribute GetOptionAttribute<TOption>()
+    {
+        return typeof(TOption).GetCustomAttribute<OptionAttribute>();
+    }
+
+    protected string GetOptionId<TOption>()
+    {
+        var optionId = GetOptionAttribute<TOption>()?.OptionId;
+        if (optionId == null)
+        {
+            throw new ArgumentException("Option must implement OptionAttribute");
+        }
+        
+        return optionId;
+    }
+
+    protected TValue GetDefaultValue<TOption, TValue>()
+    {
+        return (TValue) GetOptionAttribute<TOption>().DefaultValue;
+    }
+}