using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using StackExchange.Redis;
using StackExchange.Redis.KeyspaceIsolation;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Text;
using System.Text.Json.Serialization;
using System.Threading.Tasks;

namespace YLErp.Cache
{
    public class YLRedisCache : IYLCache
    {
        private readonly IOptions<CacheConfig> _cacheConfig;
        private readonly ConnectionMultiplexer _redisConnector;
        private readonly IServer redisServer;
        private IDatabase db;

        public YLRedisCache(IOptions<CacheConfig> cacheConfig)
        {
            _cacheConfig = cacheConfig;
            if (_cacheConfig.Value.Enable)
            {
                var redisOptions= ConfigurationOptions.Parse(cacheConfig.Value.ConnectionString);
                _redisConnector = ConnectionMultiplexer.Connect(redisOptions);
                redisServer = _redisConnector.GetServer(redisOptions.EndPoints.FirstOrDefault());
                db = _redisConnector.GetDatabase(cacheConfig.Value.DataBaseNum);
                //db.WithKeyPrefix(GenerateKey(""));
            }
        }
        /// <summary>
        /// 缓存是否可用
        /// </summary>
        /// <returns></returns>
        public bool CacheEnable()
        { 
            return _cacheConfig.Value.Enable;
        }

        public bool DeleteKey(string key)
        {
            return db.KeyDelete(key);
        }

        public bool StringSet(string key, string value)
        {
            return db.StringSet(GenerateKey(key), value);
        }

        public bool HashSet<T>(string key, string hashKey, T value)
        {
            return db.HashSet(key, hashKey, JsonConvert.SerializeObject(value));
        }

        public string StringGet(string key)
        {
            return db.StringGet(GenerateKey(key));
        }

        public bool StringSet<T>(string key, object value)
        {
            return StringSet(key, JsonConvert.SerializeObject(value));
        }

        public T StringGet<T>(string key) where T : class
        {
            var value = StringGet(key);
            if (string.IsNullOrEmpty(value))
            {
                return null;
            }
            return JsonConvert.DeserializeObject<T>(value);
        }

        public T StringGetWithNoPrefix<T>(string key) where T : class
        {
            var value = db.StringGet(key);
            if (string.IsNullOrEmpty(value))
            {
                return null;
            }
            return JsonConvert.DeserializeObject<T>(value);
        }

        #region Batch Operate
        private async Task<List<RedisValue>> SerializeObject<T>(List<T> objs)
        {
            return await Task.Factory.StartNew(() =>
            {
                List<RedisValue> redisValues = new List<RedisValue>();
                foreach (T obj in objs)
                {
                    redisValues.Add(JsonConvert.SerializeObject(obj));
                }
                return redisValues;
            });
        }

        private async Task<RedisValue> SerializeObject<T>(T obj)
        {
            return await Task.Factory.StartNew(() =>
            {
                return JsonConvert.SerializeObject(obj);
            });
        }

        /// <summary>
        /// 批量增加
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="preKey"></param>
        /// <param name="setSize"></param>
        /// <param name="values"></param>
        public async Task BatchAdd<T>(string preKey,List<T> values, int setSize = 1000)
        {
            //Stopwatch stopwatch1= Stopwatch.StartNew();
            //List<Task> tasktest=new List<Task>();
            //foreach (var obj in values)
            //{
            //    tasktest.Add(SerializeObject(obj));
            //}
            //await Task.WhenAll(tasktest);
            //stopwatch1.Stop();
            //Console.WriteLine($"测试序列化耗时：{stopwatch1.ElapsedMilliseconds}");

            //for (var i = 0; i < values.Count; i++)
            //{
            //    int page = i / setSize;
            //    if (!dicRedisValue.ContainsKey(page))
            //    {
            //        dicRedisValue.Add(page, new List<RedisValue>());
            //    }
            //    dicRedisValue[page].Add(JsonConvert.SerializeObject(values[i]));
            //}


            //var batch = db.CreateBatch();
            //List<Task> tasks = new List<Task>();
            //for (int i = 0; i < values.Count; i++)
            //{
            //    int page = i / setSize;
            //    var key = GenerateKey($"{preKey}:{page}");
            //    tasks.Add(batch.SetAddAsync(key, JsonConvert.SerializeObject(values[i])));
            //}

            Stopwatch stopwatch = Stopwatch.StartNew();
            // 数据分组
            Dictionary<int, Task<List<RedisValue>>> dicRedisValue = new Dictionary<int, Task<List<RedisValue>>>();
            var valueCount = values.Count;
            var pageCount = valueCount % setSize > 0 ? (valueCount / setSize) + 1 : (valueCount / setSize);
            var page = 0;
            while (page <=pageCount)
            {
                var takeDataCount = page * setSize > valueCount ? valueCount - (page - 1) * setSize : setSize;
                var datas = values.Skip(page * setSize).Take(takeDataCount);
                dicRedisValue.Add(page, SerializeObject(datas.ToList()));
                page++;
            }
            await Task.WhenAll(dicRedisValue.Values);
            stopwatch.Stop();
            Console.WriteLine($"Redis批量保存序列化耗时：{stopwatch.ElapsedMilliseconds}");

            // 保存数据
            stopwatch.Restart();
            List<Task> tasks = new List<Task>();
            // 每组对应一个Set
            var batch = db.CreateBatch();
            foreach (int itemKey in dicRedisValue.Keys)
            {
                var key = GenerateKey($"{preKey}:{itemKey}");
                var value = dicRedisValue[itemKey].Result.ToArray();
                tasks.Add(batch.SetAddAsync(key, value));
            }

            batch.Execute();
            await Task.WhenAll(tasks);
            stopwatch.Stop();
            Console.WriteLine($"redis 添加执行耗时：{stopwatch.ElapsedMilliseconds}");
        }

        /// <summary>
        /// 批量删除
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="keys"></param>
        public bool BatchDelete(string pattern)
        {
            var endpoints = _redisConnector.GetEndPoints(); // 获取所有节点
            var patterns = GenerateKey(pattern);
            foreach (var endpoint in endpoints)
            {
                var server = _redisConnector.GetServer(endpoint);
                var keys = server.Keys(db.Database, pattern: patterns);
                // 逐键删除（规避跨槽位）
                foreach (var key in keys)
                {
                    db.KeyDelete(key);
                }
            }
            return true;
        }

        /// <summary>
        /// 批量查询
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="pattern"></param>
        /// <returns></returns>
        public List<T> BatchQuery<T>(string pattern) 
        {
            var keys = QueryKeys(pattern);
            if (!keys.Any())
            { 
                return new List<T>();  
            }
            var redisValues = db.SetCombine(SetOperation.Union, keys.ToArray());
            return redisValues
                ?.Select(g => JsonConvert.DeserializeObject<T>(g.ToString()))
                ?.ToList();
        }

        /// <summary>
        /// 模糊查询
        /// </summary>
        /// <param name="pattern"></param>
        public IEnumerable<RedisKey> QueryKeys(string pattern)
        {
            return redisServer.Keys(db.Database, GenerateKey(pattern));
        }
        #endregion

        /// <summary>
        /// 生成带固定前缀Otc的Key
        /// </summary>
        /// <param name="originKey"></param>
        /// <returns></returns>
        public string GenerateKey(string originKey)
        {
            return $"Otc:{originKey}";
        }
        /// <summary>
        /// 保存不带前缀的key
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public bool StringSetWithNoPrefix<T>(string key, object value,TimeSpan? timeSpan) where T : class
        {
            return db.StringSet(key, JsonConvert.SerializeObject(value), timeSpan);
        }
    }
}