package xorm

import (
	"crypto/tls"
	//"fmt"
	"regexp"
	"strconv"
	//"strings"
	"time"
)

type mysql struct {
	user              string
	passwd            string
	net               string
	addr              string
	dbname            string
	params            map[string]string
	loc               *time.Location
	timeout           time.Duration
	tls               *tls.Config
	allowAllFiles     bool
	allowOldPasswords bool
	clientFoundRows   bool
}

/*func readBool(input string) (value bool, valid bool) {
	switch input {
	case "1", "true", "TRUE", "True":
		return true, true
	case "0", "false", "FALSE", "False":
		return false, true
	}

	// Not a valid bool value
	return
}*/

func (cfg *mysql) parseDSN(dsn string) (err error) {
	//cfg.params = make(map[string]string)
	dsnPattern := regexp.MustCompile(
		`^(?:(?P<user>.*?)(?::(?P<passwd>.*))?@)?` + // [user[:password]@]
			`(?:(?P<net>[^\(]*)(?:\((?P<addr>[^\)]*)\))?)?` + // [net[(addr)]]
			`\/(?P<dbname>.*?)` + // /dbname
			`(?:\?(?P<params>[^\?]*))?$`) // [?param1=value1&paramN=valueN]
	matches := dsnPattern.FindStringSubmatch(dsn)
	//tlsConfigRegister := make(map[string]*tls.Config)
	names := dsnPattern.SubexpNames()

	for i, match := range matches {
		switch names[i] {
		case "dbname":
			cfg.dbname = match
		}
	}
	return
}

func (db *mysql) Init(uri string) error {
	return db.parseDSN(uri)
}

func (db *mysql) SqlType(c *Column) string {
	var res string
	switch t := c.SQLType.Name; t {
	case Bool:
		res = TinyInt
	case Serial:
		c.IsAutoIncrement = true
		c.IsPrimaryKey = true
		c.Nullable = false
		res = Int
	case BigSerial:
		c.IsAutoIncrement = true
		c.IsPrimaryKey = true
		c.Nullable = false
		res = BigInt
	case Bytea:
		res = Blob
	default:
		res = t
	}

	var hasLen1 bool = (c.Length > 0)
	var hasLen2 bool = (c.Length2 > 0)
	if hasLen1 {
		res += "(" + strconv.Itoa(c.Length) + ")"
	} else if hasLen2 {
		res += "(" + strconv.Itoa(c.Length) + "," + strconv.Itoa(c.Length2) + ")"
	}
	return res
}

func (db *mysql) SupportInsertMany() bool {
	return true
}

func (db *mysql) QuoteStr() string {
	return "`"
}

func (db *mysql) SupportEngine() bool {
	return true
}

func (db *mysql) AutoIncrStr() string {
	return "AUTO_INCREMENT"
}

func (db *mysql) SupportCharset() bool {
	return true
}

func (db *mysql) IndexOnTable() bool {
	return true
}

func (db *mysql) IndexCheckSql(tableName, idxName string) (string, []interface{}) {
	args := []interface{}{db.dbname, tableName, idxName}
	sql := "SELECT `INDEX_NAME` FROM `INFORMATION_SCHEMA`.`STATISTICS`"
	sql += " WHERE `TABLE_SCHEMA` = ? AND `TABLE_NAME` = ? AND `INDEX_NAME`=?"
	return sql, args
}

func (db *mysql) ColumnCheckSql(tableName, colName string) (string, []interface{}) {
	args := []interface{}{db.dbname, tableName, colName}
	sql := "SELECT `COLUMN_NAME` FROM `INFORMATION_SCHEMA`.`COLUMNS` WHERE `TABLE_SCHEMA` = ? AND `TABLE_NAME` = ? AND `COLUMN_NAME` = ?"
	return sql, args
}

func (db *mysql) TableCheckSql(tableName string) (string, []interface{}) {
	args := []interface{}{db.dbname, tableName}
	sql := "SELECT `TABLE_NAME` from `INFORMATION_SCHEMA`.`TABLES` WHERE `TABLE_SCHEMA`=? and `TABLE_NAME`=?"
	return sql, args
}