using Aitex.Core.RT.DBCore;
using Sicentury.Core;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MECF.Framework.RT.EquipmentLibrary.HardwareUnits.GasFlow
{
    /// <summary>
    /// 气体流量统计，根据输入名称和时间来查询
    /// </summary>
    public class GasFlowSqlHelp
    {
        /// <summary>
        /// 根据名称和时间段查询结果
        /// </summary>
        /// <param name="module">模块名称</param>
        /// <param name="name"></param>
        /// <param name="start"></param>
        /// <param name="end"></param>
        /// <returns></returns>
        public static double Query(string module, string name, DateTime start, DateTime end)
        {
            var daySlices = DateRangeHelper.SplitInToHours(new DateRangeHelper(start, end), 12);
            string tableName = module;
            string propertyCmd = "," + $"\"{module}.{name}.FeedBack\"";
            string property = $"{module}.{name}.FeedBack";

            return GetData(GetDataSetList(daySlices, tableName, propertyCmd, property), property);
        }
        private static List<DataSet> GetDataSetList(IEnumerable<DateRangeHelper> daySlices, string tableName, string propertyCmd, string property)
        {
            List<DataSet> DataSetList = new List<DataSet>();
            foreach (var range in daySlices)
            {
                var ts = range.Diff;
                for (var day = 0; day <= ts.Days; day++)
                {
                    var tblName = $"{range.Start.AddDays(day):yyyyMMdd}.{tableName}";
                    var sql = new StringBuilder();
                    // 检查表名是否存在，否则SQL执行出错。
                    if (CheckTableExists(tblName))
                    {
                        sql.Append("select time AS InternalTimeStamp");
                        // 添加待查询的列
                        sql.Append(propertyCmd);
                        sql.Append($", \"time\"");
                        sql.Append($" from \"{tblName}\"");

                        if (day < ts.Days)
                            sql.Append(" UNION ");
                        sql.Append(
                    $" where time between {range.Start.Ticks} and {range.End.Ticks} and '{property}' is not NULL  order by InternalTimeStamp asc");
                        try
                        {
                            DataSet dataSet = DB.ExecuteDataset(sql.ToString());
                            if (dataSet is not null && dataSet.Tables[0].Rows.Count > 0)
                                DataSetList.Add(dataSet);
                        }
                        catch (Exception ex)//查询较早日期时，可能不存在属性会报错
                        {

                        }

                    }
                }
            }
            return DataSetList;
        }
        private static double GetData(List<DataSet> dataSetList, string property)
        {
            double values = 0;
            string rowStr;
            foreach (DataSet ds in dataSetList)
            {
                double timeDifference = 0;
                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {
                    rowStr = ds.Tables[0].Rows[i][property].ToString();
                    if (rowStr is not null && rowStr.Length == 0)
                        continue;
                    double bd = double.Parse(ds.Tables[0].Rows[i][property].ToString());
                    if (bd > 0)
                    {

                        if (i != ds.Tables[0].Rows.Count - 1)//最后一个数据使用的时间差，是它前一个计算得到的
                        {
                            var startTime = new DateTime(long.Parse(ds.Tables[0].Rows[i]["time"].ToString()));
                            var endTime = new DateTime(long.Parse(ds.Tables[0].Rows[i + 1]["time"].ToString()));
                            timeDifference = (endTime - startTime).TotalSeconds;
                        }
                        values += bd * timeDifference;
                    }
                }
            }
            return values;
        }

        private static bool CheckTableExists(string tableName)
        {
            var sql =
                $"SELECT EXISTS ( SELECT FROM pg_tables WHERE schemaname = 'public' AND tablename = '{tableName}' )";
            var table = DB.ExecuteDataset(sql);
            if (table == null)
                return false;

            if (table.Tables[0].Rows.Count <= 0)
                return false;

            var value = table.Tables[0].Rows[0]["exists"].ToString();
            if (value.ToLower() == "true")
                return true;

            return false;
        }
    }
}