using Admin.Core.Common.Auth;
using Admin.Core.Common.Cache;
using AutoMapper;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using System;

namespace Admin.Core.Service
{
    public abstract class BaseService: IBaseService
    {
        protected readonly object ServiceProviderLock = new object();
        private ICache _cache;
        private ILoggerFactory _loggerFactory;
        private IMapper _mapper;
        private IUser _user;

        /// <summary>
        /// 缓存
        /// </summary>
        public ICache Cache => LazyGetRequiredService(ref _cache);

        /// <summary>
        /// 日志工厂
        /// </summary>
        public ILoggerFactory LoggerFactory => LazyGetRequiredService(ref _loggerFactory);

        /// <summary>
        /// 映射
        /// </summary>
        public IMapper Mapper => LazyGetRequiredService(ref _mapper);

        public IServiceProvider ServiceProvider { get; set; }

        /// <summary>
        /// 用户信息
        /// </summary>
        public IUser User => LazyGetRequiredService(ref _user);

        /// <summary>
        /// 日志
        /// </summary>
        protected ILogger Logger => _lazyLogger.Value;

        private Lazy<ILogger> _lazyLogger => new Lazy<ILogger>(() => LoggerFactory?.CreateLogger(GetType().FullName) ?? NullLogger.Instance, true);

        protected TService LazyGetRequiredService<TService>(ref TService reference)
        {
            if (reference == null)
            {
                lock (ServiceProviderLock)
                {
                    if (reference == null)
                    {
                        reference = ServiceProvider.GetRequiredService<TService>();
                    }
                }
            }

            return reference;
        }
    }
}