using FreeRedis;
using System;
using System.Collections.Generic;
using System.Linq;

namespace WCS.Redis
{
    /// <summary>
    /// Redis操作类
    /// </summary>
    public class RedisHelper
    {
        /// <summary>
        /// 连接集合
        /// </summary>
        private static List<RedisClientList> RedisClients = new List<RedisClientList>();

        /// <summary>
        /// 默认上下文类类型
        /// </summary>
        public static string DefaultDbContextType { get; private set; } = null!;

        /// <summary>
        /// 设置默认链接
        /// </summary>
        /// <param name="key"></param>
        public static void SetDefaultDbContextType(string key)
        {
            DefaultDbContextType = key;
        }

        /// <summary>
        /// 默认链接
        /// </summary>
        public static RedisClient Default()
        {
            if (DefaultDbContextType == null)
                throw new Exception("请先设置默认RedisDB库,调用静态方法SetDefaultDbContextType()");
            return Context(DefaultDbContextType);
        }

        /// <summary>
        /// 创建一个连接
        /// </summary>
        /// <param name="connectionString"> 连接字符串</param>
        /// <param name="key">标识</param>
        /// <param name="defaultClient"> 是否为默认连接，默认为false</param>
        /// <returns></returns>
        public static RedisClient CreateContext(string connectionString, string key, bool defaultClient = false)
        {
            var ctx = RedisClients.FirstOrDefault(v => v.Key == key);
            if (ctx != null) return ctx.Client;
            ctx = new RedisClientList(key, new RedisClient(connectionString), connectionString);
            RedisClients.Add(ctx);
            if (defaultClient)
            {
                SetDefaultDbContextType(key);
            }
            return ctx.Client;
        }

        /// <summary>
        /// 获取指定的连接
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        public static RedisClient Context(string key)
        {
            var ctx = RedisClients.FirstOrDefault(v => v.Key == key);
            if (ctx == null) throw new Exception("没有对应的链接，请先调用创建");
            return ctx.Client;
        }
    }

    /// <summary>
    /// 链接集合
    /// </summary>
    public class RedisClientList
    {
        /// <summary>
        /// 连接集合
        /// </summary>
        /// <param name="key">连接标识</param>
        /// <param name="client">连接</param>
        /// <param name="connectionConfig">连接字符串</param>
        public RedisClientList(string key, RedisClient client, string connectionConfig)
        {
            this.Key = key;
            Client = client;
            ConnectionConfig = connectionConfig;
        }

        /// <summary>
        /// 连接标识
        /// </summary>
        public string Key { get; set; }

        /// <summary>
        /// 连接
        /// </summary>
        public RedisClient Client { get; set; }

        /// <summary>
        /// 连接字符串
        /// </summary>
        public string ConnectionConfig { get; set; }
    }
}