package starainrt

import (
	"database/sql"
	"errors"
	"reflect"
	"strconv"
)

var DBRes *sql.DB
var DBRows *sql.Rows

type StarDB struct {
	DB   *sql.DB
	Rows *sql.Rows
}

type StarRows struct {
	Rows         *sql.Rows
	Length       int
	StringResult []map[string]string
	Columns      []string
	ColumnsType  []reflect.Type
	columnref    map[string]int
	result       [][]interface{}
}

type StarResult struct {
	Result      []interface{}
	Columns     []string
	columnref   map[string]int
	ColumnsType []reflect.Type
}

type StarResultCol struct {
	Result []interface{}
}

func (this *StarResultCol) MustBytes() [][]byte {
	var res [][]byte
	for _, v := range this.Result {
		res = append(res, v.([]byte))
	}
	return res
}

func (this *StarResultCol) MustBool() []bool {
	var res []bool
	for _, v := range this.Result {
		res = append(res, v.(bool))
	}
	return res
}
func (this *StarResultCol) MustFloat32() []float32 {
	var res []float32
	for _, v := range this.Result {
		res = append(res, v.(float32))
	}
	return res
}
func (this *StarResultCol) MustFloat64() []float64 {
	var res []float64
	for _, v := range this.Result {
		res = append(res, v.(float64))
	}
	return res
}
func (this *StarResultCol) MustString() []string {
	var res []string
	for _, v := range this.Result {
		res = append(res, v.(string))
	}
	return res
}
func (this *StarResultCol) MustInt32() []int32 {
	var res []int32
	for _, v := range this.Result {
		res = append(res, v.(int32))
	}
	return res
}
func (this *StarResultCol) MustInt64() []int64 {
	var res []int64
	for _, v := range this.Result {
		res = append(res, v.(int64))
	}
	return res
}
func (this *StarResultCol) MustInt() []int {
	var res []int
	for _, v := range this.Result {
		res = append(res, v.(int))
	}
	return res
}

func (this *StarResult) MustInt64(name string) int64 {
	num, ok := this.columnref[name]
	if !ok {
		return 0
	}
	res := this.Result[num].(int64)
	return res
}
func (this *StarResult) MustInt32(name string) int32 {
	num, ok := this.columnref[name]
	if !ok {
		return 0
	}
	res := this.Result[num].(int32)
	return res
}
func (this *StarResult) MustString(name string) string {
	num, ok := this.columnref[name]
	if !ok {
		return ""
	}
	res := this.Result[num].(string)
	return res
}
func (this *StarResult) MustFloat64(name string) float64 {
	num, ok := this.columnref[name]
	if !ok {
		return 0
	}
	res := this.Result[num].(float64)
	return res
}
func (this *StarResult) MustFloat32(name string) float32 {
	num, ok := this.columnref[name]
	if !ok {
		return 0
	}
	res := this.Result[num].(float32)
	return res
}
func (this *StarResult) MustInt(name string) int {
	num, ok := this.columnref[name]
	if !ok {
		return 0
	}
	res := this.Result[num].(int)
	return res
}

func (this *StarResult) MustBool(name string) bool {
	num, ok := this.columnref[name]
	if !ok {
		return false
	}
	res := this.Result[num].(bool)
	return res
}
func (this *StarResult) MustBytes(name string) []byte {
	num, ok := this.columnref[name]
	if !ok {
		return []byte{}
	}
	res := this.Result[num].([]byte)
	return res
}

func (this *StarRows) Rescan() {
	this.parserows()
}

func (this *StarRows) Col(name string) *StarResultCol {
	result := new(StarResultCol)
	if _, ok := this.columnref[name]; !ok {
		return result
	}
	var rescol []interface{}
	for _, v := range this.result {
		rescol = append(rescol, v[this.columnref[name]])
	}
	result.Result = rescol
	return result
}

func (this *StarRows) Row(id int) *StarResult {
	result := new(StarResult)
	if id+1 > len(this.result) {
		return result
	}
	result.Result = this.result[id]
	result.Columns = this.Columns
	result.ColumnsType = this.ColumnsType
	result.columnref = this.columnref
	return result
}

func (this *StarRows) Close() error {
	return this.Rows.Close()
}

func (this *StarRows) parserows() {
	this.result = [][]interface{}{}
	this.columnref = make(map[string]int)
	this.StringResult = []map[string]string{make(map[string]string)}
	this.Columns, _ = this.Rows.Columns()
	types, _ := this.Rows.ColumnTypes()
	for _, v := range types {
		this.ColumnsType = append(this.ColumnsType, v.ScanType())
	}
	scanArgs := make([]interface{}, len(this.Columns))
	values := make([]interface{}, len(this.Columns))
	for i, _ := range values {
		this.columnref[this.Columns[i]] = i
		scanArgs[i] = &values[i]
	}
	for this.Rows.Next() {
		if err := this.Rows.Scan(scanArgs...); err != nil {
			return
		}
		record := make(map[string]string)
		var rescopy []interface{}
		for i, col := range values {
			rescopy = append(rescopy, col)
			switch vtype := col.(type) {
			case float64:
				record[this.Columns[i]] = strconv.FormatFloat(vtype, 'f', -1, 64)
			case int64:
				record[this.Columns[i]] = strconv.FormatInt(vtype, 10)
			case string:
				record[this.Columns[i]] = vtype
			case nil:
				record[this.Columns[i]] = ""
			default:
				record[this.Columns[i]] = string(vtype.([]byte))
			}
		}
		this.result = append(this.result, rescopy)
		this.StringResult = append(this.StringResult, record)
	}
	this.Length = len(this.StringResult)
}

func (this *StarDB) Query(args ...interface{}) (*StarRows, error) {
	var err error
	effect := new(StarRows)
	if err = this.DB.Ping(); err != nil {
		return effect, err
	}
	if len(args) == 0 {
		return effect, errors.New("no args")
	}
	if len(args) == 1 {
		sql := args[0]
		if this.Rows, err = this.DB.Query(sql.(string)); err != nil {
			return effect, err
		}
		effect.Rows = this.Rows
		effect.parserows()
		return effect, nil
	}
	sql := args[0]
	stmt, err := this.DB.Prepare(sql.(string))
	defer stmt.Close()
	if err != nil {
		return effect, err
	}
	var para []interface{}
	for k, v := range args {
		if k != 0 {
			switch vtype := v.(type) {
			default:
				para = append(para, vtype)
			}
		}
	}
	if this.Rows, err = stmt.Query(para...); err != nil {
		return effect, err
	}
	effect.Rows = this.Rows
	effect.parserows()
	return effect, nil
}

func (this *StarDB) Open(Method, ConnStr string) error {
	var err error
	this.DB, err = sql.Open(Method, ConnStr)
	if err != nil {
		return err
	}
	err = this.DB.Ping()
	return err
}

func (this *StarDB) Close() error {
	if err := this.DB.Close(); err != nil {
		return err
	}
	return this.Rows.Close()
}

func (this *StarDB) Exec(args ...interface{}) (sql.Result, error) {
	var err error
	var effect sql.Result
	if err = this.DB.Ping(); err != nil {
		return effect, err
	}
	if len(args) == 0 {
		return effect, errors.New("no args")
	}
	if len(args) == 1 {
		sql := args[0]
		if _, err = this.DB.Exec(sql.(string)); err != nil {
			return effect, err
		}
		return effect, nil
	}
	sql := args[0]
	stmt, err := this.DB.Prepare(sql.(string))
	defer stmt.Close()
	if err != nil {
		return effect, err
	}
	var para []interface{}
	for k, v := range args {
		if k != 0 {
			switch vtype := v.(type) {
			default:
				para = append(para, vtype)
			}
		}
	}
	if effect, err = stmt.Exec(para...); err != nil {
		return effect, err
	}
	return effect, nil
}

func FetchAll(rows *sql.Rows) (error, map[int]map[string]string) {
	var ii int = 0
	records := make(map[int]map[string]string)
	columns, err := rows.Columns()
	if err != nil {
		return err, records
	}
	scanArgs := make([]interface{}, len(columns))
	values := make([]interface{}, len(columns))
	for i := range values {
		scanArgs[i] = &values[i]
	}
	for rows.Next() {
		if err := rows.Scan(scanArgs...); err != nil {
			return err, records
		}
		record := make(map[string]string)
		for i, col := range values {
			switch vtype := col.(type) {
			case float64:
				record[columns[i]] = strconv.FormatFloat(vtype, 'f', -1, 64)
			case int64:
				record[columns[i]] = strconv.FormatInt(vtype, 10)
			case string:
				record[columns[i]] = vtype
			case nil:
				record[columns[i]] = ""
			default:
				record[columns[i]] = string(vtype.([]byte))
			}
		}
		records[ii] = record
		ii++
	}
	return nil, records
}

func OpenDB(Method, ConnStr string) error {
	var err error
	DBRes, err = sql.Open(Method, ConnStr)
	if err != nil {
		return err
	}
	err = DBRes.Ping()
	return err
}
func CloseDB() {
	DBRes.Close()
	DBRows.Close()
}

func Query(args ...interface{}) (error, map[int]map[string]string) {
	var err error
	records := make(map[int]map[string]string)
	if err = DBRes.Ping(); err != nil {
		return err, records
	}
	if len(args) == 0 {
		return errors.New("no args"), records
	}
	if len(args) == 1 {
		sql := args[0]
		if DBRows, err = DBRes.Query(sql.(string)); err != nil {
			return err, records
		}
		return FetchAll(DBRows)
	}
	sql := args[0]
	stmt, err := DBRes.Prepare(sql.(string))
	defer stmt.Close()
	if err != nil {
		return err, records
	}
	var para []interface{}
	for k, v := range args {
		if k != 0 {
			switch vtype := v.(type) {
			default:
				para = append(para, vtype)
			}
		}
	}
	if DBRows, err = stmt.Query(para...); err != nil {
		return err, records
	}
	return FetchAll(DBRows)

}

func DBExec(args ...interface{}) error {
	var err error
	if err = DBRes.Ping(); err != nil {
		return err
	}
	if len(args) == 0 {
		return errors.New("no args")
	}
	if len(args) == 1 {
		sql := args[0]
		if _, err = DBRes.Exec(sql.(string)); err != nil {
			return err
		}
		return nil
	}
	sql := args[0]
	stmt, err := DBRes.Prepare(sql.(string))
	defer stmt.Close()
	if err != nil {
		return err
	}
	var para []interface{}
	for k, v := range args {
		if k != 0 {
			switch vtype := v.(type) {
			default:
				para = append(para, vtype)
			}
		}
	}
	if _, err = stmt.Exec(para...); err != nil {
		return err
	}
	return nil

}