package utils_gorm

import (
	"context"
	"fmt"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
	"regexp"
	"strings"
	"time"
)

type CustomLogger struct {
	gormLogger logger.Interface
	db         *gorm.DB
}

func NewCustomLogger(db *gorm.DB) *CustomLogger {
	return &CustomLogger{
		gormLogger: logger.Default.LogMode(logger.Info),
		db:         db,
	}
}

func (l *CustomLogger) LogMode(level logger.LogLevel) logger.Interface {
	newlogger := *l
	newlogger.gormLogger = l.gormLogger.LogMode(level)
	return &newlogger
}

func (l *CustomLogger) Info(ctx context.Context, msg string, data ...interface{}) {
	l.gormLogger.Info(ctx, msg, data...)
}

func (l *CustomLogger) Warn(ctx context.Context, msg string, data ...interface{}) {
	l.gormLogger.Warn(ctx, msg, data...)
}

func (l *CustomLogger) Error(ctx context.Context, msg string, data ...interface{}) {
	l.gormLogger.Error(ctx, msg, data...)
}

func (l *CustomLogger) Trace(ctx context.Context, begin time.Time, fc func() (sql string, rowsAffected int64), err error) {
	elapsed := time.Since(begin)
	sql, _ := fc()
	l.gormLogger.Trace(ctx, begin, fc, err)
	operation := extractOperation(sql)
	tableName := extractTableName(sql)
	fmt.Println(tableName)
	//// 将SQL语句保存到数据库
	if operation == 0 || tableName == "sql_log" {
		return
	}
	//go l.db.Model(&SqlLog{}).Create(&SqlLog{
	//	OperatorID:   1,
	//	OperatorName: "test",
	//	SqlInfo:      sql,
	//	TableNames:   tableName,
	//	Type:         operation,
	//})

	// 如果有需要，也可以根据执行时间（elapsed）等条件过滤或处理日志记录
	if elapsed > time.Second {
		//l.gormLogger.Warn(ctx, "Slow SQL (> 1s): %s", sql)
	}
}

// extractTableName extracts the table name from a SQL query, supporting quoted table names.
func extractTableName(sql string) string {
	// 使用非捕获组匹配多种SQL操作关键词
	re := regexp.MustCompile(`(?i)\b(?:from|update|into|delete\s+from)\b\s+[\` + "`" + `"]?(\w+)[\` + "`" + `"]?`)
	match := re.FindStringSubmatch(sql)

	// 检查是否匹配成功
	if len(match) > 1 {
		return match[1]
	}

	return ""
}

// extractOperation extracts the operation type from a SQL query.
func extractOperation(sql string) int32 {
	sql = strings.TrimSpace(strings.ToLower(sql))
	var operation int32
	if strings.HasPrefix(sql, "select") {
		operation = 0
	} else if strings.HasPrefix(sql, "insert") {
		operation = 1
	} else if strings.HasPrefix(sql, "update") {
		operation = 3
	} else if strings.HasPrefix(sql, "delete") {
		operation = 2
	}
	return operation
}