chaosbot/ChaosBot/Repositories/ConfigurationRepository.cs

using System;
using System.Linq;
using ChaosBot.Models;
using System.Text.Json;
using Microsoft.Extensions.Configuration;

namespace ChaosBot.Repositories
{
    public static class ConfigurationRepository
    {
        public static T GetValue<T>(string key, ulong guildId)
        {
            return GetValue<T>(key, guildId, default);
        }
        
        public static T GetValue<T>(string key, ulong guildId, T defaultValue)
        {
            using (ChaosbotContext dbContext = new ChaosbotContext())
            {
                Configuration config = dbContext.Configuration
                    .SingleOrDefault(c => c.DiscordGuildId == guildId && c.Key == key);
                if (config == null || string.IsNullOrEmpty(config.SerializedValue))
                    return GetValueFromAppSettings(key, guildId, defaultValue);
                return JsonSerializer.Deserialize<T>(config.SerializedValue);
            }
        }

        public static void DeleteValue(string key, ulong guildId)
        {
            using (ChaosbotContext dbContext = new ChaosbotContext())
            {
                Configuration config = dbContext.Configuration
                    .SingleOrDefault(c => c.DiscordGuildId == guildId && c.Key == key);
                if (config == null) return;
                dbContext.Remove(config);
                dbContext.SaveChanges();
            }
        }

        private static T GetValueFromAppSettings<T>(string key, ulong guildId, T defaultValue)
        {
            return Program.AppSettingsHandler.GetValue($"Servers:{guildId}:{key}", Program.AppSettingsHandler.GetValue(key, defaultValue));
        }
    }
}