using HealthMonitor.Common;
using HealthMonitor.Common.helper;
using HealthMonitor.Model.Config;
using HealthMonitor.Service.Biz.db.Dto;
using Microsoft.EntityFrameworkCore.Metadata.Internal;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TDengineDriver;
using TDengineDriver.Impl;

namespace HealthMonitor.Service.Biz.db
{
    public class TDengineService
    {

        private readonly ILogger<TDengineService> _logger;
        private readonly HttpHelper _httpHelper=default!;
        private readonly TDengineServiceConfig _configTDengineService;
        public TDengineService(ILogger<TDengineService> logger, 
            IOptions<TDengineServiceConfig> configTDengineService,
            HttpHelper httpHelper
            ) 
        {
            _logger = logger;
            _configTDengineService = configTDengineService.Value;
            _httpHelper = httpHelper;
        }
        public IntPtr Connection() 
        {
             
            string host = _configTDengineService.Host;
            string user = _configTDengineService.UserName;
            string db = _configTDengineService.DB;
            short port = _configTDengineService.Port;
            string password = _configTDengineService.Password;
//#if DEBUG
//            //string configDir = "C:/TDengine/cfg";
//            //TDengine.Options((int)TDengineInitOption.TSDB_OPTION_CONFIGDIR, configDir);
//            TDengine.Options((int)TDengineInitOption.TSDB_OPTION_TIMEZONE, "Asia/Beijing");
//#endif
            IntPtr conn = TDengine.Connect(host, user, password, db, port);


            if (conn == IntPtr.Zero)
            {
                _logger.LogError($"连接 TDengine 失败....");
            }
            else
            {
                _logger.LogInformation($"连接 TDengine 成功....");
            }
            return conn;
        }
        public void ExecuteSQL(IntPtr conn, string sql)
        {
            IntPtr res = TDengine.Query(conn, sql);
            // Check if query success
            if ((res == IntPtr.Zero) || (TDengine.ErrorNo(res) != 0))
            {
                Console.Write(sql + " failure, ");
                // Get error message while Res is a not null pointer.
                if (res != IntPtr.Zero)
                {
                    Console.Write("reason:" + TDengine.Error(res));
                }
            }
            else
            {
                Console.Write(sql + " success, {0} rows affected", TDengine.AffectRows(res));
                //... do something with res ...

                // Important: need to free result to avoid memory leak.
                TDengine.FreeResult(res);
            }
        }

        public void ExecuteQuerySQL(IntPtr conn, string sql)
        {
            IntPtr res = TDengine.Query(conn, sql);
            // Check if query success
            if ((res == IntPtr.Zero) || (TDengine.ErrorNo(res) != 0))
            {
                Console.Write(sql + " failure, ");
                // Get error message while Res is a not null pointer.
                if (res != IntPtr.Zero)
                {
                    Console.Write("reason:" + TDengine.Error(res));
                }
            }
            else
            {
                Console.Write(sql + " success, {0} rows affected", TDengine.AffectRows(res));
                //... do something with res ...

                List<TDengineDriver.TDengineMeta> resMeta = LibTaos.GetMeta(res);
                List<object> resData = LibTaos.GetData(res);

                foreach (var meta in resMeta)
                {
                    _logger.LogInformation("\t|{meta.name} {meta.TypeName()} ({meta.size})\t|", meta.name, meta.TypeName(), meta.size);
                }

                for (int i = 0; i < resData.Count; i++)
                {
                    _logger.LogInformation($"|{resData[i].ToString()} \t");
                    if (((i + 1) % resMeta.Count == 0))
                    {
                        _logger.LogInformation("");
                    }
                }

                // Important: need to free result to avoid memory leak.
                TDengine.FreeResult(res);
            }
        }

        public void CheckRes(IntPtr conn, IntPtr res, String errorMsg)
        {
            if (TDengine.ErrorNo(res) != 0)
            {
                throw new Exception($"{errorMsg} since: {TDengine.Error(res)}");
            }
        }

        public void ExecuteInsertSQL(string sql)
        {
            var conn = Connection();
            try
            {
                //sql = "INSERT INTO d1001 USING meters TAGS('California.SanFrancisco', 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000) " +
                //               "d1002 USING power.meters TAGS('California.SanFrancisco', 3) VALUES('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000) " +
                //               "d1003 USING power.meters TAGS('California.LosAngeles', 2) VALUES('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000)('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000) " +
                //               "d1004 USING power.meters TAGS('California.LosAngeles', 3) VALUES('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000)('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)";
//#if DEBUG
//                //string configDir = "C:/TDengine/cfg";
//                //TDengine.Options((int)TDengineInitOption.TSDB_OPTION_CONFIGDIR, configDir);
//                TDengine.Options((int)TDengineInitOption.TSDB_OPTION_TIMEZONE, "Asia/Beijing");
//#endif
                IntPtr res = TDengine.Query(conn, sql);
                CheckRes(conn, res, "failed to insert data");
                int affectedRows = TDengine.AffectRows(res);
                _logger.LogInformation("affectedRows {affectedRows}" , affectedRows);
                TDengine.FreeResult(res);
            }
            finally
            {
                TDengine.Close(conn);
            }
        }

        #region TDengine.Connector  async query
        public void QueryCallback(IntPtr param, IntPtr taosRes, int code)
        {
            if (code == 0 && taosRes != IntPtr.Zero)
            {
                FetchRawBlockAsyncCallback fetchRowAsyncCallback = new FetchRawBlockAsyncCallback(FetchRawBlockCallback);
                TDengine.FetchRawBlockAsync(taosRes, fetchRowAsyncCallback, param);
            }
            else
            {
                _logger.LogInformation("async query data failed, failed code {code}",code);
            }
        }
        // Iteratively call this interface until "numOfRows" is no greater than 0.
        public void FetchRawBlockCallback(IntPtr param, IntPtr taosRes, int numOfRows)
        {
            if (numOfRows > 0)
            {
                _logger.LogInformation("{numOfRows} rows async retrieved", numOfRows);
                IntPtr pdata = TDengine.GetRawBlock(taosRes);
                List<TDengineMeta> metaList = TDengine.FetchFields(taosRes);
                List<object> dataList = LibTaos.ReadRawBlock(pdata, metaList, numOfRows);

                for (int i = 0; i < metaList.Count; i++)
                {
                    _logger.LogInformation("{0} {1}({2}) \t|", metaList[i].name, metaList[i].type, metaList[i].size);
                }
                _logger.LogInformation("");
                for (int i = 0; i < dataList.Count; i++)
                {
                    if (i != 0 && i % metaList.Count == 0)
                    {
                        _logger.LogInformation("{dataList[i]}\t|", dataList[i]);
                    }
                    _logger.LogInformation("{dataList[i]}\t|", dataList[i]);
                }
                TDengine.FetchRawBlockAsync(taosRes, FetchRawBlockCallback, param);
            }
            else
            {
                if (numOfRows == 0)
                {
                    _logger.LogInformation("async retrieve complete.");
                }
                else
                {
                    _logger.LogInformation("FetchRawBlockCallback callback error, error code {numOfRows}", numOfRows);
                }
                TDengine.FreeResult(taosRes);
            }
        }

        public void ExecuteQueryAsync(string sql)
        {
            var conn = Connection();
            QueryAsyncCallback queryAsyncCallback = new QueryAsyncCallback(QueryCallback);
            TDengine.QueryAsync(conn, sql, queryAsyncCallback, IntPtr.Zero);
        }

        //public void ExecuteQuery(string sql)
        //{
        //    var conn = Connection();
        //    QueryAsyncCallback queryAsyncCallback = new QueryAsyncCallback(QueryCallback);
        //    TDengine.QueryAsync(conn, sql, queryAsyncCallback, IntPtr.Zero);
        //}



        public Aggregate GetAggregateValue(string field, string tbName, string? condition)
        {
            List<int> data = new();

            var sql = $"SELECT MAX({field}), MIN({field}) FROM {_configTDengineService.DB}.{tbName} WHERE {condition}";

            var conn = Connection();
            try
            {
                IntPtr res = TDengine.Query(conn, sql);
                // Check if query success
                if ((res == IntPtr.Zero) || (TDengine.ErrorNo(res) != 0))
                {
                    Console.Write(sql + " failure, ");
                    // Get error message while Res is a not null pointer.
                    if (res != IntPtr.Zero)
                    {
                        Console.Write("reason:" + TDengine.Error(res));
                    }
                }
                else
                {
                    Console.Write(sql + " success, {0} rows affected", TDengine.AffectRows(res));
                    //... do something with res ...

                    List<TDengineMeta> resMeta = LibTaos.GetMeta(res);
                    List<object> resData = LibTaos.GetData(res);

                    foreach (var meta in resMeta)
                    {
                        Console.Write($"\t|{meta.name} {meta.TypeName()} ({meta.size})\t|");
                    }
                    resData.ForEach(x => data.Add(SafeType.SafeInt(x)));

                    // Important: need to free result to avoid memory leak.
                    TDengine.FreeResult(res);
                }
            }
            finally
            {
                TDengine.Close(conn);
            }
           

            return new Aggregate
            {
                Max = data.Count.Equals(0) ? 0 : data[0],
                Min = data.Count.Equals(0) ? 0 : data[1],
            };
        }

        public int GetAvgExceptMaxMinValue(string field, string tbName, string? condition)
        {
            List<int> data = new();
            var sql = $"SELECT MAX({field}), MIN({field}) FROM {_configTDengineService.DB}.{tbName} WHERE {condition}";

            var aggregate= GetAggregateValue(field, tbName, condition);

            var sqlAvg = $"SELECT AVG({field}) FROM {_configTDengineService.DB}.{tbName} WHERE {condition} AND {field} < {aggregate.Max} and {field} > {aggregate.Min}";
         
            var conn = Connection();

            try
            {
                IntPtr res = TDengine.Query(conn, sqlAvg);
                // Check if query success
                if ((res == IntPtr.Zero) || (TDengine.ErrorNo(res) != 0))
                {
                    Console.Write(sqlAvg + " failure, ");
                    // Get error message while Res is a not null pointer.
                    if (res != IntPtr.Zero)
                    {
                        Console.Write("reason:" + TDengine.Error(res));
                    }
                }
                else
                {
                    Console.Write(sqlAvg + " success, {0} rows affected", TDengine.AffectRows(res));
                    //... do something with res ...

                    List<TDengineMeta> resMeta = LibTaos.GetMeta(res);
                    List<object> resData = LibTaos.GetData(res);

                    foreach (var meta in resMeta)
                    {
                        Console.Write($"\t|{meta.name} {meta.TypeName()} ({meta.size})\t|");
                    }
                    resData.ForEach(x => data.Add(SafeType.SafeInt(x)));

                    // Important: need to free result to avoid memory leak.
                    TDengine.FreeResult(res);
                }
            }
            finally
            {
                TDengine.Close(conn);
            }
            

            return data.Count.Equals(0) ? 0 : data[0];
        }
        #endregion

        #region RestAPI

        public async Task<bool> GernalRestSql(string sql)
        {

            //"http://{server}:{port}/rest/sql/{db}"
            var url = $"http://{_configTDengineService.Host}:{_configTDengineService.RestPort}/rest/sql/{_configTDengineService.DB}";
            List<KeyValuePair<string, string>> headers = new()
                {
                    new KeyValuePair<string, string>("Authorization", "Basic " + _configTDengineService.Token)
                };
            var result = await _httpHelper.HttpToPostAsync(url, sql, headers).ConfigureAwait(false);
            var res = JsonConvert.DeserializeObject<TDengineRestResBase>(result!);
            if (result != null)
            {
                if (res?.Code == 0)
                {
                    _logger.LogInformation($"{nameof(GernalRestSql)},SQL 语句执行成功|{sql}");
                    return true;
                }
                else
                {
                    _logger.LogWarning($"{nameof(GernalRestSql)},SQL 语句执行失败||{sql}");
                    return false;
                }
            }
            else
            {
                _logger.LogError($"{nameof(GernalRestSql)},TDengine 服务器IP:{_configTDengineService.Host} 错误，请联系运维人员");
                return false;
            }
            //return res.Code==0;
        }

        public async Task<string?> GernalRestSqlResTextAsync(string sql) 
        {
            var url = $"http://{_configTDengineService.Host}:{_configTDengineService.RestPort}/rest/sql/{_configTDengineService.DB}";
            List<KeyValuePair<string, string>> headers = new()
                {
                    new KeyValuePair<string, string>("Authorization", "Basic " + _configTDengineService.Token)
                };
            var result = await _httpHelper.HttpToPostAsync(url, sql, headers).ConfigureAwait(false);
            return result;
        }

        public async Task<Aggregate> GetAggregateValueAsync(string field,string tbName,string? condition) 
        {
            var sql = $"SELECT MAX({field}), MIN({field}) FROM {_configTDengineService.DB}.{tbName} WHERE {condition}";

           
            var result = await GernalRestSqlResTextAsync(sql);
            var res = JsonConvert.DeserializeObject<Aggregate>(result!);
            List<dynamic> data = res?.Data!;
           
            return new Aggregate
            {
                Max = data.Count.Equals(0) ? 0 : data[0][0],
                Min = data.Count.Equals(0) ? 0 : data[0][1],
            };
        }

        public async Task<int> GetAvgExceptMaxMinValueAsync(string field, string tbName, string? condition)
        {

            var sql = $"SELECT MAX({field}), MIN({field}) FROM {_configTDengineService.DB}.{tbName} WHERE {condition}";

            var result = await GernalRestSqlResTextAsync(sql);
            var res = JsonConvert.DeserializeObject<TDengineRestResBase>(result!);
            List<dynamic> data = res?.Data!;

            var sqlAvg = $"SELECT AVG({field}) FROM {_configTDengineService.DB}.{tbName} WHERE {condition} AND {field} < { (data.Count.Equals(0)? 0: data[0][0]) } and {field} > {(data.Count.Equals(0) ? 0 : data[0][1])}";
            result = await GernalRestSqlResTextAsync(sqlAvg);
            res = JsonConvert.DeserializeObject<TDengineRestResBase>(result!);
            data = res?.Data!;

            return data.Count.Equals(0)?0:(int)data[0][0];
        }

        #endregion

    }
}