package services

import (
	"Quincy_admin/repositories"
	"Quincy_admin/schemas"
	"bufio"
	"log"
	"os"
	"strings"
)

type CommonService struct {
	repo *repositories.CommonRepository
}

func NewCommonService(repo *repositories.CommonRepository) *CommonService {
	return &CommonService{repo: repo}
}

// GetLoginLogList 获取登录日志列表
func (s *CommonService) GetLoginLogList(req *schemas.LoginLogListRequest) ([]*schemas.LoginLog, int64, error) {
	return s.repo.GetLoginLogList(req)
}

// ReadLastLines 读取文件最后几行
func (s *CommonService) ReadLastLines(filepath string, lines int) (string, error) {
	file, err := os.Open(filepath)
	if err != nil {
		return "", err
	}
	defer func(file *os.File) {
		err := file.Close()
		if err != nil {
			log.Println("Error closing file:", err)
		}
	}(file)

	// 使用Scanner按行读取
	scanner := bufio.NewScanner(file)
	var allLines []string

	for scanner.Scan() {
		allLines = append(allLines, scanner.Text())
	}

	if err := scanner.Err(); err != nil {
		return "", err
	}

	// 获取最后几行
	totalLines := len(allLines)
	start := totalLines - lines
	if start < 0 {
		start = 0
	}

	result := allLines[start:]
	return strings.Join(result, "\n"), nil
}