using Infrastructure.Application.Entites.Settings;
using Microsoft.Extensions.Caching.Distributed;
using System.Linq;
using Infrastructure.Extensions;
using System.Globalization;
using System;

namespace Infrastructure.Application.Services.Settings
{
    public class CachedSettingService : ISettingService
    {
        private readonly IDistributedCache _cache;
        private readonly SettingService _settingService;
        private readonly string _keyTemplate = "iot-setting-{0}";

        public CachedSettingService(IDistributedCache cache, SettingService settingService)
        {
            this._cache = cache;
            this._settingService = settingService;
        }

        public Setting GetSetting(string name)
        {
            var key = string.Format(CultureInfo.InvariantCulture, _keyTemplate, name);
            var setting = this._cache.Get<Setting>(key);
            if (setting == null)
            {
                setting = this._settingService.GetSetting(name);
                _cache.Set(key, setting);
            }
            return setting;
        }

        public void AddSetting(Setting setting)
        {
            this._settingService.AddSetting(setting);
        }

        public void DeleteSetting(Setting setting)
        {
            if (setting is null)
            {
                throw new ArgumentNullException(nameof(setting));
            }
            this._settingService.DeleteSetting(setting);
            var key = string.Format(CultureInfo.InvariantCulture, _keyTemplate, setting.Name);
            this._cache.Remove(key);
        }

        public void UpdateSetting(Setting setting)
        {
            if (setting is null)
            {
                throw new ArgumentNullException(nameof(setting));
            }
            this._settingService.UpdateSetting(setting);
            var key = string.Format(CultureInfo.InvariantCulture, _keyTemplate, setting.Name);
            this._cache.Remove(key);
        }

        public IQueryable<Setting> Table()
        {
            return _settingService.Table();
        }

        public IQueryable<Setting> ReadonlyTable()
        {
            return _settingService.ReadonlyTable();
        }
    }
}