package iotLog

import (
	"fmt"
	"os"
	"path/filepath"
	"time"
)

// Clean 清理日志文件
func Clean(dataDays, deviceDays int) (err error) {
	err = cleanDataLog(dataDays)
	if err != nil {
		return err
	}
	err = cleanDeviceLog(deviceDays)
	if err != nil {
		return err
	}
	return
}

func cleanDataLog(days int) error {
	path := getDataLogPath()
	//删除30天前的日志文件
	return deleteLogsOlderThan(path, "data", days)
}
func cleanDeviceLog(days int) error {
	path := getDeviceLogPath()
	//删除30天前的日志文件
	return deleteLogsOlderThan(path, "log", days)
}

// deleteLogsOlderThan 删除比指定日期早的日志文件。
// days 参数表示需要删除的日志文件是几天前的。
func deleteLogsOlderThan(path, suffix string, days int) error {
	threshold := time.Now().AddDate(0, 0, -days)

	files, err := filepath.Glob(filepath.Join(path, "*."+suffix)) // 假设日志文件以.log结尾
	if err != nil {
		return fmt.Errorf("failed to list files in %s: %w", path, err)
	}

	for _, file := range files {
		fileInfo, err := os.Stat(file)
		if err != nil {
			if os.IsNotExist(err) {
				fmt.Printf("File %s does not exist\n", file)
			} else {
				return fmt.Errorf("failed to get info for %s: %w", file, err)
			}
		}

		// 检查文件修改时间是否早于阈值
		if fileInfo.ModTime().Before(threshold) {
			err = os.Remove(file)
			if err != nil {
				return fmt.Errorf("failed to delete %s: %w", file, err)
			}
			fmt.Printf("Deleted log file: %s\n", file)
		}
	}

	return nil
}