package dbutils

import (
	executils "github.com/TeaOSLab/EdgeAPI/internal/utils/exec"
	"github.com/iwind/TeaGo/Tea"
	"github.com/iwind/TeaGo/dbs"
	"github.com/iwind/TeaGo/lists"
	"github.com/iwind/TeaGo/logs"
	"github.com/iwind/TeaGo/types"
	"net"
	"os"
	"os/exec"
	"regexp"
	"strings"
	"time"
)

// NewQuery 构造Query
func NewQuery(tx *dbs.Tx, dao dbs.DAOWrapper, adminId int64, userId int64) *dbs.Query {
	query := dao.Object().Query(tx)
	if adminId > 0 {
		//query.Attr("adminId", adminId)
	}
	if userId > 0 {
		query.Attr("userId", userId)
	}
	return query
}

// QuoteLikeKeyword 处理关键词中的特殊字符
func QuoteLikeKeyword(keyword string) string {
	keyword = strings.ReplaceAll(keyword, "%", "\\%")
	keyword = strings.ReplaceAll(keyword, "_", "\\_")
	return keyword
}

func QuoteLike(keyword string) string {
	return "%" + QuoteLikeKeyword(keyword) + "%"
}

func QuoteLikePrefix(keyword string) string {
	return QuoteLikeKeyword(keyword) + "%"
}

func QuoteLikeSuffix(keyword string) string {
	return "%" + QuoteLikeKeyword(keyword)
}

// SetGlobalVarMin 设置变量最小值
func SetGlobalVarMin(db *dbs.DB, variableName string, minValue int) error {
	result, err := db.FindOne("SHOW VARIABLES WHERE variable_name=?", variableName)
	if err != nil {
		return err
	}
	if len(result) == 0 {
		return nil
	}
	var oldValue = result.GetInt("Value")
	if oldValue > 0 /** 小于等于0通常表示不限制 **/ && oldValue < minValue {
		_, err = db.Exec("SET GLOBAL "+variableName+"=?", minValue)
		return err
	}
	return nil
}

// SetGlobalVarMax 设置变量最大值
func SetGlobalVarMax(db *dbs.DB, variableName string, maxValue int) error {
	result, err := db.FindOne("SHOW VARIABLES WHERE variable_name=?", variableName)
	if err != nil {
		return err
	}
	if len(result) == 0 {
		return nil
	}
	var oldValue = result.GetInt("Value")
	if oldValue > maxValue {
		_, err = db.Exec("SET GLOBAL "+variableName+"=?", maxValue)
		return err
	}
	return nil
}

// IsLocalAddr 是否为本地数据库
func IsLocalAddr(addr string) bool {
	var host = addr
	if strings.Contains(addr, ":") {
		host, _, _ = net.SplitHostPort(addr)
		if len(host) == 0 {
			host = addr
		}
	}

	if host == "127.0.0.1" || host == "::1" || host == "localhost" {
		return true
	}

	interfaceAddrs, _ := net.InterfaceAddrs()
	for _, interfaceAddr := range interfaceAddrs {
		if strings.HasPrefix(interfaceAddr.String(), host+"/") {
			return true
		}
	}
	return false
}

// MySQLVersion 读取当前MySQL版本
func MySQLVersion() (version string, err error) {
	db, err := dbs.Default()
	if err != nil {
		return "", err
	}
	result, err := db.FindCol(0, "SELECT VERSION()")
	if err != nil {
		return "", err
	}
	version = types.String(result)
	var suffixIndex = strings.Index(version, "-")
	if suffixIndex > 0 {
		version = version[:suffixIndex]
	}
	return
}

func MySQLVersionFrom8() (bool, error) {
	version, err := MySQLVersion()
	if err != nil {
		return false, err
	}
	if len(version) == 0 {
		return false, nil
	}
	var dotIndex = strings.Index(version, ".")
	if dotIndex > 0 {
		return types.Int(version[:dotIndex]) >= 8, nil
	}
	return false, nil
}

// FindMySQLPath find out mysqld_safe path from system processes
func FindMySQLPath() string {
	psExe, err := executils.LookPath("ps")
	if err != nil {
		return ""
	}
	var cmd = executils.NewTimeoutCmd(3*time.Second, psExe, "-ef").
		WithStdout().
		WithStderr()
	err = cmd.Run()
	if err != nil {
		return ""
	}
	var reg = regexp.MustCompile(`\s(/\S+/mysqld_safe)\s`)
	var matches = reg.FindStringSubmatch(cmd.Stdout())
	if len(matches) > 1 {
		var path = matches[1]
		_, err = os.Stat(path)
		if err != nil {
			return ""
		}
		return path
	}
	return ""
}

// FindMySQLPathAndRemember find out mysqld_safe path then remember it for future usage
func FindMySQLPathAndRemember() {
	var path = FindMySQLPath()
	if len(path) == 0 {
		return
	}

	var cacheFile = Tea.Root + "/data/mysql-path.cache"
	_ = os.WriteFile(cacheFile, []byte(path), 0666) // ignore error
}

// StartLocalMySQL try to start local mysql server
func StartLocalMySQL() {
	// possible installed paths
	var mysqldSafeFiles = []string{}

	// read last path from cache file
	var cacheFile = Tea.Root + "/data/mysql-path.cache"
	cacheData, err := os.ReadFile(cacheFile)
	if err == nil && len(cacheData) > 0 {
		mysqldSafeFiles = append(mysqldSafeFiles, string(cacheData))
	}

	// from $PATH variable
	exePath, lookErr := executils.LookPath("mysqld_safe")
	if lookErr == nil && len(exePath) > 0 && !lists.ContainsString(mysqldSafeFiles, exePath) {
		mysqldSafeFiles = append(mysqldSafeFiles, exePath)
	}

	// these installed by edge-boot or foolish-mysql
	for _, path := range []string{
		"/usr/local/mysql/bin/mysqld_safe",
		"/usr/local/mysql8/bin/mysqld_safe",
	} {
		if !lists.ContainsString(mysqldSafeFiles, path) {
			mysqldSafeFiles = append(mysqldSafeFiles, path)
		}
	}
	
	for _, mysqldSafeFile := range mysqldSafeFiles {
		_, err := os.Stat(mysqldSafeFile)
		if err == nil {
			logs.Println("[API_NODE]try to start local mysql server from '" + mysqldSafeFile + "' ...")
			var mysqlCmd = exec.Command(mysqldSafeFile)
			_ = mysqlCmd.Start()
			break
		}
	}
}