package middleware

import (
	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"sort"
	"xg_dba/internal/models"

	"github.com/BurntSushi/toml"
)

func Cache() {

	// 指定需要查找的根文件夹路径
	folderPath := "C:\\Program_GT\\Code\\Go\\Work\\xugu\\xg_dba\\config"

	packageModels := make(map[string]models.Cache)

	err := filepath.Walk(folderPath, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		if info.IsDir() {
			listenFilePath := filepath.Join(path, "listen.toml")

			var connectInfo models.ConnectInfo
			var systemMetaInfo models.SystemMetaInfo

			if fileExists(listenFilePath) {
				if _, err := parseTomlFile(listenFilePath, &connectInfo); err != nil {
					return err
				}
			}

			latestOsInfoFilePath, err := getLatestOsInfoFile(path)
			if err != nil {
				return err
			}

			if latestOsInfoFilePath != "" {
				if _, err := parseTomlFile(latestOsInfoFilePath, &systemMetaInfo); err != nil {
					return err
				}
			}

			host := connectInfo.Ssh.Host
			if host != "" {
				packageModels[host] = models.Cache{
					ConnectInfo:    connectInfo,
					SystemMetaInfo: systemMetaInfo,
				}
			}
		}
		return nil
	})

	if err != nil {
		fmt.Printf("Error walking the path %q: %v\n", folderPath, err)
		return
	}

	for host, cache := range packageModels {
		fmt.Printf("Host: %s, Cache: %+v\n", host, cache)
	}
}

func fileExists(filename string) bool {
	info, err := os.Stat(filename)
	if os.IsNotExist(err) {
		return false
	}
	return !info.IsDir()
}

func parseTomlFile(filePath string, v interface{}) (toml.MetaData, error) {
	file, err := os.Open(filePath)
	if err != nil {
		return toml.MetaData{}, err
	}
	defer file.Close()

	decoder := toml.NewDecoder(file)
	metaData, err := decoder.Decode(v)
	if err != nil {
		return toml.MetaData{}, err
	}
	return metaData, nil
}

func getLatestOsInfoFile(dirPath string) (string, error) {
	pattern := regexp.MustCompile(`^os_info(?:_\d{8}_\d{6})?\.toml$`)
	files, err := os.ReadDir(dirPath)
	if err != nil {
		return "", err
	}

	var matchingFiles []string
	for _, file := range files {
		if !file.IsDir() && pattern.MatchString(file.Name()) {
			matchingFiles = append(matchingFiles, filepath.Join(dirPath, file.Name()))
		}
	}

	if len(matchingFiles) == 0 {
		return "", nil
	}

	sort.Slice(matchingFiles, func(i, j int) bool {
		return matchingFiles[i] > matchingFiles[j]
	})

	return matchingFiles[0], nil
}