package xugu

import (
	"database/sql/driver"
	"encoding/binary"
	"fmt"
	"io"
	"math"
	"reflect"
	"time"
)

type xuguRows struct {
	rows_conn *xuguConn

	results  *SelectResult
	colIdx   int
	prepared bool
}

func (row *xuguRows) Next(dest []driver.Value) error {
	gt("Next()")
	defer gt("Next() end")

	if row.results.rowIdx >= len(row.results.Values[0]) {
		//return errors.New("The result set has been released")
		return io.EOF
	}
	//	fmt.Println(" -- int(row.results.Field_Num)", int(row.results.Field_Num))

	for j := 0; j < int(row.results.Field_Num); j++ {

		coluType := row.results.Fields[j].FieldType
		//fmt.Println("  --coluType: ", coluType, row.results.Fields[j].typeDatabaseName())

		switch coluType {

		case fieldType_BINARY,
			fieldType_CLOB,
			fieldType_BLOB:
			dest[j] = row.results.Values[j][row.results.rowIdx].Col_Data

		case fieldType_INTERVAL_Y, fieldType_INTERVAL_M, fieldType_INTERVAL_D, 
		fieldType_INTERVAL_H,fieldType_INTERVAL_S, 
			fieldType_INTERVAL_MI:
			dest[j] = binary.BigEndian.Uint32(row.results.Values[j][row.results.rowIdx].Col_Data)

		case fieldType_TIME,
			fieldType_TIME_TZ, fieldType_DATE:
			tv, _ := time.Parse("15:04:05", string(row.results.Values[j][row.results.rowIdx].Col_Data))
			dest[j] = tv

		case fieldType_DATETIME,
			fieldType_DATETIME_TZ:

			if len(row.results.Values[j][row.results.rowIdx].Col_Data) == 0 {
				dest[j] = nil
			} else {
				//timeTmp := binary.LittleEndian.Uint64(reverseBytes(row.results.Values[j][row.results.rowIdx].Col_Data)
				timeTmp := binary.BigEndian.Uint64(row.results.Values[j][row.results.rowIdx].Col_Data)

				//tv, _ := time.Parse("2006-01-02 15:04:05", string(reverseBytes(row.results.Values[j][row.results.rowIdx].Col_Data)))
				tv := time.Unix(0, int64(timeTmp)*1000000)
				utcTime := tv.UTC()
				dest[j] = utcTime
			}

		case fieldType_R4:
			dest[j] = math.Float32frombits(binary.BigEndian.Uint32(row.results.Values[j][row.results.rowIdx].Col_Data))
			fmt.Println("float ", dest[j])
		case fieldType_R8:

			dest[j] = math.Float64frombits(binary.BigEndian.Uint64(row.results.Values[j][row.results.rowIdx].Col_Data))
			fmt.Println("	dest[j]  r8", dest[j])
		case fieldType_NUM:
			dest[j] = row.results.Values[j][row.results.rowIdx].Col_Data
		case fieldType_I1:
			dest[j] = int8(row.results.Values[j][row.results.rowIdx].Col_Data[0])
		case fieldType_I2:
			dest[j] = int16(binary.BigEndian.Uint16(row.results.Values[j][row.results.rowIdx].Col_Data))
		case fieldType_I4:
			dest[j] = binary.BigEndian.Uint32(row.results.Values[j][row.results.rowIdx].Col_Data)
		case fieldType_I8:
			dest[j] = int64(binary.BigEndian.Uint64(row.results.Values[j][row.results.rowIdx].Col_Data))
			//dest[j] = row.results.Values[j][row.results.rowIdx].Col_Data

		case fieldType_CHAR, fieldType_NCHAR:
			dest[j] = string(row.results.Values[j][row.results.rowIdx].Col_Data)
		default:

			//填入一行的数据
			//TODO这里长度改为一行长度
			dest[j] = make([]byte, len(row.results.Values))
			// Values[字段][0]
			dest[j] = row.results.Values[j][row.results.rowIdx].Col_Data

		}
	}
	row.results.rowIdx++

	return nil
}

// Columns返回列的名字集，它的个数是从slice的长度中推断出来的。
// 如果不知道特定的列名，应该为该条目返回一个空的字符串
func (row *xuguRows) Columns() []string {
	gt("Columns()")
	defer gt("Columns() end")

	var columns []string

	for _, v := range row.results.Fields {
		columns = append(columns, v.FieldName)
	}

	return columns
}

func (row *xuguRows) ColumnTypeScanType(index int) reflect.Type {
	fmt.Println(">>>>>ColumnTypeScanType ")

	return row.results.Fields[index].scanType()
}

func (self *xuguRows) Close() error {
	fmt.Println(">>>>>((self *xuguRows) Close() ")
	return nil
}