using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;

using StackExchange;
using StackExchange.Redis;

namespace RedisStuy
{
    /// <summary>
    /// 客户端操作
    /// </summary>
    public static class RedisHelper
    {
        /// <summary>
        /// 获取 Redis连接
        /// (此为共享和线程安全的，可以设计成单例模式)
        /// </summary>
        public static IConnectionMultiplexer GetConnectionMultiplexer()
        {
            ConfigurationOptions options = new ConfigurationOptions();
            options.DefaultDatabase = 1;
            options.AllowAdmin = true;
            options.EndPoints.Add("127.0.0.1", 6379);

            IConnectionMultiplexer connection = ConnectionMultiplexer.Connect(options);

            return connection;
        }


        /// <summary>
        /// 获取 默认Reids服务器
        /// </summary>
        /// <returns></returns>
        public static IServer GetDefaultRedisServer()
        {
            IConnectionMultiplexer connection = GetConnectionMultiplexer();
            IServer redisServer = connection.GetServer(connection.GetEndPoints()[0]);
            return redisServer;
        }

        /// <summary>
        /// 获取Redis连接上的所有Redis
        /// </summary>
        public static List<IServer> GetAllRedisServer()
        {
            List<IServer> redisServers = new List<IServer>();
            IConnectionMultiplexer connection = GetConnectionMultiplexer();
            EndPoint[] endPoints = connection.GetEndPoints();
            foreach (EndPoint endPoint in endPoints)
            {
                redisServers.Add(connection.GetServer(endPoint));
            }

            return redisServers;
        }

        /// <summary>
        /// 获取 Redis数据库
        /// </summary>
        public static IDatabase GetRedisDatabase()
        {
            IConnectionMultiplexer connection = GetConnectionMultiplexer();

            IDatabase redisDatabase = connection.GetDatabase();

            return redisDatabase;
        }

        /// <summary>
        ///  获取 Redis数据库
        /// </summary>
        /// <param name="databaseIndex">
        ///  redis中数据库编号为0-15，超出则默认为0号数据库
        /// </param>
        public static IDatabase GetRedisDatabase(int databaseIndex)
        {
            //redis中数据库为0-15，超出则默认为0号数据库
            if (databaseIndex<0 || databaseIndex>=16)
            {
                databaseIndex = 0;
            }

            IConnectionMultiplexer connection = GetConnectionMultiplexer();

            IDatabase redisDatabase = connection.GetDatabase(databaseIndex);

            return redisDatabase;
        }
    }
}