using System;
using System.Collections.Generic;

namespace SKMC.Api.Common
{
    /// <summary>
    /// <p>接口工厂</p>
    /// <br>类似IOC容器, 可将接口与实例注册绑定, 在需要调用接口时获取实例</br>
    /// <br>Resolve获取单例, Create创建新实例</br>
    /// </summary>
    public class ObjectFactory
    {
        private static readonly ILogger log = LogFactory.Get();

        private static readonly Dictionary<Type, Dictionary<string, object>> container = new Dictionary<Type, Dictionary<string, object>>();

        /// <summary>
        /// 注册接口实例
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="obj"></param>
        /// <param name="name"></param>
        public static void Register<T>(object obj, string name = "default")
        {
            Type type = typeof(T);
            if (!container.ContainsKey(type))
            {
                container[type] = new Dictionary<string, object>();
            }
            //else
            //{
            //    throw new SystemException($"Register Failed, Cannot Register SameType: {type.Name}");
            //}
            container[type][name] = obj;
            log.Debug($"Register {type.Name} success");
        }

        /// <summary>
        /// 反注册接口实例, 重复注册前需要反注册
        /// </summary>
        /// <typeparam name="T"></typeparam>
        public static void UnRegister<T>()
        {
            Type type = typeof(T);
            if (container.ContainsKey(type))
            {
                bool result = container.Remove(type);
                log.Debug($"UnRegister Type: {type.Name}: {result}");
            }
        }

        /// <summary>
        /// 解析接口实例(单例)
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="name"></param>
        /// <returns></returns>
        public static T Resolve<T>(string name = "default")
        {
            Type type = typeof(T);
            if (container.ContainsKey(type) && container[type].ContainsKey(name))
            {
                object obj = (T)container[type][name];
                //log.Debug($"Create {type.Name} success, obj: {obj.GetHashCode()}");
                return (T)obj;
            }
            throw new SystemException($"Resolve Faild, No object for [{type}] with name [{name}] found.");
        }

        /// <summary>
        /// 创建接口实例(多例)
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="name"></param>
        /// <returns></returns>
        public static T Create<T>(string name = "default")
        {
            Type type = typeof(T);
            if (container.ContainsKey(type) && container[type].ContainsKey(name))
            {
                object objectNow = container[type][name];
                object objectNew = Activator.CreateInstance(objectNow.GetType());
                //log.Debug($"Create {type.Name} success, obj: {objectNew.GetHashCode()}");
                return (T)objectNew;
            }
            throw new SystemException($"Create Faild, No object for [{type}] with name [{name}] found.");
        }
    }
}