#region

using StackExchange.Redis;
using Web.Core.Common.Helper;

#endregion

namespace Web.Core.Common.Redis;

public class RedisCacheManager : IRedisCacheManager
{
    private readonly string redisConnenctionString;
    private readonly string DefaultKey; //默认的 Key 值（用来当作 RedisKey 的前缀）
    public volatile ConnectionMultiplexer redisConnection;
    private readonly IDatabase _db;
    private readonly object redisConnectionLock = new();

    public RedisCacheManager()
    {
        var redisConfiguration = AppSettings.GetConnectionString("Redis"); //获取连接字符串
        var dbnum = AppSettings.GetValue("RedisInfo:DefaultDB", 15);

        if (string.IsNullOrWhiteSpace(redisConfiguration))
        {
            throw new ArgumentException("redis config is empty", nameof(redisConfiguration));
        }

        redisConnenctionString = redisConfiguration;
        redisConnection = GetRedisConnection();
        _db = redisConnection.GetDatabase(dbnum);
        DefaultKey = AppSettings.GetLogLevel("RedisInfo:DefaultKey");
    }

    /// <summary>
    /// 核心代码，获取连接实例
    /// 通过双if 夹lock的方式，实现单例模式
    /// </summary>
    /// <returns></returns>
    private ConnectionMultiplexer GetRedisConnection()
    {
        //如果已经连接实例，直接返回
        if (redisConnection != null && redisConnection.IsConnected)
        {
            return redisConnection;
        }

        //加锁，防止异步编程中，出现单例无效的问题
        lock (redisConnectionLock)
        {
            if (redisConnection != null)
            {
                //释放redis连接
                redisConnection.Dispose();
            }

            try
            {
                redisConnection = ConnectionMultiplexer.Connect(redisConnenctionString);
            }
            catch (Exception)
            {
                throw new Exception("Redis服务未启用，请开启该服务");
            }
        }

        return redisConnection;
    }

    /// <summary>
    /// 添加 Key 的前缀
    /// </summary>
    /// <param name="key"></param>
    /// <returns></returns>
    private string AddKeyPrefix(string key)
    {
        return $"{DefaultKey}:{key}";
    }

    public void Clear()
    {
        foreach (var endPoint in GetRedisConnection().GetEndPoints())
        {
            var server = GetRedisConnection().GetServer(endPoint);
            foreach (var key in server.Keys())
            {
                _db.KeyDelete(key);
            }
        }
    }

    public bool Get(string key)
    {
        return _db.KeyExists(AddKeyPrefix(key));
    }

    public string GetValue(string key)
    {
        return _db.StringGet(key);
    }

    public TEntity Get<TEntity>(string key)
    {
        var value = _db.StringGet(key);
        if (value.HasValue)
        {
            //需要用的反序列化，将Redis存储的Byte[]，进行反序列化
            return SerializeHelper.Deserialize<TEntity>(value);
        }
        else
        {
            return default;
        }
    }

    public void Remove(string key)
    {
        _db.KeyDelete(AddKeyPrefix(key));
    }

    public void Set(string key, object value, TimeSpan cacheTime)
    {
        if (value != null)
        {
            //序列化，将object值生成RedisValue
            //_db.StringSet(AddKeyPrefix(key), SerializeHelper.Serialize(value), cacheTime);
            _db.StringSet(key, SerializeHelper.Serialize(value), cacheTime);
        }
    }

    public bool SetValue(string key, byte[] value)
    {
        return _db.StringSet(AddKeyPrefix(key), value, TimeSpan.FromSeconds(120));
    }

    public async Task ClearAsync()
    {
        foreach (var endPoint in GetRedisConnection().GetEndPoints())
        {
            var server = GetRedisConnection().GetServer(endPoint);
            foreach (var key in server.Keys())
            {
                await _db.KeyDeleteAsync(key);
            }
        }
    }

    public async Task<bool> GetAsync(string key)
    {
        return await _db.KeyExistsAsync(AddKeyPrefix(key));
    }

    public async Task<string> GetValueAsync(string key)
    {
        return await _db.StringGetAsync(AddKeyPrefix(key));
    }

    public async Task<TEntity> GetAsync<TEntity>(string key)
    {
        var value = await _db.StringGetAsync(AddKeyPrefix(key));
        if (value.HasValue)
        {
            //需要用的反序列化，将Redis存储的Byte[]，进行反序列化
            return SerializeHelper.Deserialize<TEntity>(value);
        }
        else
        {
            return default;
        }
    }

    public async Task RemoveAsync(string key)
    {
        await _db.KeyDeleteAsync(AddKeyPrefix(key));
    }

    public async Task RemoveByKey(string key)
    {
        var redisResult = await _db.ScriptEvaluateAsync(LuaScript.Prepare(
            //Redis的keys模糊查询：
            " local res = redis.call('KEYS', @keypattern) " +
            " return res "), new { @keypattern = AddKeyPrefix(key) });

        if (!redisResult.IsNull)
        {
            var keys = (string[])redisResult;
            foreach (var k in keys)
                _db.KeyDelete(k);
        }
    }

    public async Task SetAsync(string key, object value, TimeSpan cacheTime)
    {
        if (value != null)
        {
            //序列化，将object值生成RedisValue
            await _db.StringSetAsync(AddKeyPrefix(key), SerializeHelper.Serialize(value), cacheTime);
        }
    }

    public async Task<bool> SetValueAsync(string key, byte[] value)
    {
        return await _db.StringSetAsync(AddKeyPrefix(key), value, TimeSpan.FromSeconds(120));
    }
    
    #region set帮助
    
    /// <summary>
    /// Set新增
    /// </summary>
    /// <param name="redisKey"></param>
    /// <param name="member"></param>
    /// <returns></returns>
    public bool SetAdd(string redisKey, string member,bool IgnorePrefix=false)
    {
        redisKey = IgnorePrefix?redisKey:AddKeyPrefix(redisKey);
        return  _db.SetAdd(redisKey, member);
    }
    
    /// <summary>
    /// Set新增
    /// </summary>
    /// <param name="redisKey"></param>
    /// <param name="member"></param>
    /// <returns></returns>
    public async Task<bool> SetAddAsync(string redisKey, string member,bool IgnorePrefix=false)
    {
        redisKey = IgnorePrefix?redisKey:AddKeyPrefix(redisKey);
        return await _db.SetAddAsync(redisKey, member);
    }
    
    /// <summary>
    /// Set判断元素是否包含
    /// </summary>
    /// <param name="redisKey"></param>
    /// <param name="member"></param>
    /// <returns></returns>
    public bool SetContains(string redisKey, string member,bool IgnorePrefix=false)
    {
        redisKey = IgnorePrefix?redisKey:AddKeyPrefix(redisKey);
        return  _db.SetContains(redisKey, member);
    }
    
    /// <summary>
    /// Set判断元素是否包含
    /// </summary>
    /// <param name="redisKey"></param>
    /// <param name="member"></param>
    /// <returns></returns>
    public async Task<bool> SetContainsAsync(string redisKey, string member,bool IgnorePrefix=false)
    {
        redisKey = IgnorePrefix?redisKey:AddKeyPrefix(redisKey);
        return await _db.SetContainsAsync(redisKey, member);
    }
    
    
    /// <summary>
    /// Set移除元素
    /// </summary>
    /// <param name="redisKey"></param>
    /// <param name="member"></param>
    /// <returns></returns>
    public bool SetRemove(string redisKey, string member,bool IgnorePrefix=false)
    {
        redisKey = IgnorePrefix?redisKey:AddKeyPrefix(redisKey);
        return  _db.SetRemove(redisKey, member);
    }
    
    /// <summary>
    /// Set移除元素
    /// </summary>
    /// <param name="redisKey"></param>
    /// <param name="member"></param>
    /// <returns></returns>
    public async Task<bool> SetRemoveAsync(string redisKey, string member,bool IgnorePrefix=false)
    {
        redisKey = IgnorePrefix?redisKey:AddKeyPrefix(redisKey);
        return await _db.SetRemoveAsync(redisKey, member);
    }
    #endregion 
}