using System.Linq;
using System.Threading.Tasks;
using ChaosBot.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using JsonSerializer = System.Text.Json.JsonSerializer;

namespace ChaosBot.ConfigHelpers
{
    internal 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 DatabaseContext dbContext = new DatabaseContext();
            Models.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 SetValue<T>(string key, T value, ulong guildId)
        {
            using DatabaseContext dbContext = new DatabaseContext();
            Models.Configuration cnfSet = new Models.Configuration();

            cnfSet.Key = key;
            cnfSet.DiscordGuildId = guildId;
            cnfSet.SerializedValue = JsonConvert.SerializeObject(value);

            dbContext.Configuration.Upsert(cnfSet)
                .On(x => new {x.Key, x.DiscordGuildId})
                .Run();
        }

        public static void DeleteValue(string key, ulong guildId)
        {
            using DatabaseContext dbContext = new DatabaseContext();
            Models.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));
        }
    }
}