using System.Text;

namespace ThingsGateway.SqlSugar
{
    /// <summary>
    /// TDengine 插入构建器
    /// </summary>
    public class TDengineInsertBuilder : InsertBuilder
    {
        /// <summary>
        /// 获取插入SQL模板
        /// </summary>
        public override string SqlTemplate
        {
            get
            {
                if (IsReturnIdentity)
                {
                    return @"INSERT INTO {0} 
           ({1})
     VALUES
           ({2}) ";
                }
                else
                {
                    return @"INSERT INTO {0} 
           ({1})
     VALUES
           ({2})";
                }
            }
        }

        /// <summary>
        /// 获取批量插入SQL模板
        /// </summary>
        public override string SqlTemplateBatch => "INSERT INTO {0} ({1})";

        /// <summary>
        /// 获取批量插入联合SQL模板
        /// </summary>
        public override string SqlTemplateBatchUnion => " VALUES ";

        /// <summary>
        /// 获取批量插入选择SQL模板
        /// </summary>
        public override string SqlTemplateBatchSelect => " {0} ";

        /// <summary>
        /// 转换插入返回ID的函数
        /// </summary>
        public override Func<string, string, string> ConvertInsertReturnIdFunc { get; set; } = (name, sql) =>
        {
            return sql.Trim().TrimEnd(';') + $"returning {name} ";
        };

        /// <summary>
        /// 生成SQL字符串
        /// </summary>
        /// <returns>SQL字符串</returns>
        public override string ToSqlString()
        {
            if (IsNoInsertNull)
            {
                DbColumnInfoList = DbColumnInfoList.Where(it => it.Value != null).ToList();
            }
            var groupList = DbColumnInfoList.GroupBy(it => it.TableId).ToList();
            var isSingle = groupList.Count == 1;
            string columnsString = string.Join(",", groupList.First().Select(it => Builder.GetTranslationColumnName(it.DbColumnName)));
            if (isSingle)
            {
                string columnParametersString = string.Join(",", this.DbColumnInfoList.Select(it => base.GetDbColumn(it, Builder.SqlParameterKeyWord + it.DbColumnName)));
                ActionMinDate();
                return string.Format(SqlTemplate, GetTableNameString, columnsString, columnParametersString);
            }
            else
            {
                StringBuilder batchInsetrSql = new StringBuilder();
                int pageSize = 10000000;
                int pageIndex = 1;
                if (IsNoPage && IsReturnPkList)
                {
                    pageSize = groupList.Count;
                }
                int totalRecord = groupList.Count;
                int pageCount = (totalRecord + pageSize - 1) / pageSize;
                while (pageCount >= pageIndex)
                {
                    batchInsetrSql.AppendFormat(SqlTemplateBatch, GetTableNameString, columnsString);
                    int i = 0;
                    foreach (var columns in groupList.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList())
                    {
                        var isFirst = i == 0;
                        if (isFirst)
                        {
                            batchInsetrSql.Append(SqlTemplateBatchUnion);
                        }
                        batchInsetrSql.Append("\r\n ( " + string.Join(",", columns.Select(it =>
                        {
                            if (it.InsertServerTime || it.InsertSql.HasValue() || it.SqlParameterDbType is Type || it?.PropertyType?.Name == "DateOnly" || it?.PropertyType?.Name == "TimeOnly")
                            {
                                if (it.InsertServerTime)
                                {
                                    return DateTime.Now.AddMilliseconds(i).ToString("yyyy-MM-dd HH:mm:ss.ffffff").ToSqlValue();
                                }
                                return GetDbColumn(it, null);
                            }
                            object value = null;
                            if (it?.Value is DateTime)
                            {
                                value = it.Value.ObjToDate().ToString("yyyy-MM-dd HH:mm:ss.fff");
                            }
                            else if (it?.Value is bool)
                            {
                                value = it.Value?.ToString()?.ToLower();
                            }
                            else if (it.Value is DateTimeOffset)
                            {
                                return FormatDateTimeOffset(it.Value);
                            }
                            else if (it.IsArray && it.Value != null)
                            {
                                return FormatValue(it.Value, it.PropertyName, i, it);
                            }
                            else
                            {
                                value = it.Value;
                            }
                            if (value == null || value == DBNull.Value)
                            {
                                return string.Format(SqlTemplateBatchSelect, "NULL");
                            }
                            return string.Format(SqlTemplateBatchSelect, "'" + value.ObjToStringNoTrim().ToSqlFilter() + "'");
                        })) + "),");
                        ++i;
                    }
                    pageIndex++;
                    batchInsetrSql.Remove(batchInsetrSql.Length - 1, 1).Append("\r\n;\r\n");
                }
                return batchInsetrSql.ToString();
            }
        }

        /// <summary>
        /// 格式化值
        /// </summary>
        /// <param name="value">值</param>
        /// <param name="name">名称</param>
        /// <param name="i">索引</param>
        /// <param name="columnInfo">列信息</param>
        /// <returns>格式化后的值</returns>
        public object FormatValue(object value, string name, int i, DbColumnInfo columnInfo)
        {
            if (value == null)
            {
                return "NULL";
            }
            else
            {
                var type = value.GetType();
                if (type == UtilConstants.DateType || columnInfo.IsArray || columnInfo.IsJson)
                {
                    var parameterName = this.Builder.SqlParameterKeyWord + name + i;
                    var paramter = new SugarParameter(parameterName, value);
                    if (columnInfo.IsJson)
                    {
                        paramter.IsJson = true;
                    }
                    if (columnInfo.IsArray)
                    {
                        paramter.IsArray = true;
                    }
                    this.Parameters.Add(paramter);
                    return parameterName;
                }
                else if (type == UtilConstants.ByteArrayType)
                {
                    string bytesString = $"0x{BitConverter.ToString((byte[])value)}";
                    return bytesString;
                }
                else if (type.IsEnum())
                {
                    if (this.Context.CurrentConnectionConfig.MoreSettings?.TableEnumIsString == true)
                    {
                        return value.ToSqlValue();
                    }
                    else
                    {
                        return Convert.ToInt64(value);
                    }
                }
                else if (type == UtilConstants.DateTimeOffsetType)
                {
                    return FormatDateTimeOffset(value);
                }
                else if (type == UtilConstants.BoolType)
                {
                    return value.ObjToBool() ? "1" : "0";
                }
                else if (type == UtilConstants.StringType || type == UtilConstants.ObjType)
                {
                    return $"'{value.ToString().ToSqlFilter()}'";
                }
                else
                {
                    return $"'{value}'";
                }
            }
        }

        /// <summary>
        /// 格式化DateTimeOffset值
        /// </summary>
        /// <param name="value">DateTimeOffset值</param>
        /// <returns>格式化后的字符串</returns>
        public override string FormatDateTimeOffset(object value)
        {
            return $"'{((DateTimeOffset)value).ToString("o")}'";
        }
    }
}