package main

import (
    "fmt"
    "io/ioutil"
    "math/rand"
    "regexp"
    "strings"
    "time"
)

func scanStrings(filePath string) ([]string, error) {
    // 读取文件内容
    content, err := ioutil.ReadFile(filePath)
    if err != nil {
        return nil, err
    }

    // 使用正则表达式匹配字符串
    pattern := regexp.MustCompile(`[0-9A-Z]{24}`)
    matches := pattern.FindAllString(string(content), -1)

    return matches, nil
}

func removeDuplicates(slice []string) []string {
    // 使用 map 来记录已经出现过的字符串
    seen := make(map[string]bool)
    result := []string{}

    for _, s := range slice {
        if _, ok := seen[s]; !ok {
            seen[s] = true
            result = append(result, s)
        }
    }

    return result
}

func replaceUUIDs(filePath string, uuids []string) error {
    // 读取文件内容
    content, err := ioutil.ReadFile(filePath)
    if err != nil {
        return err
    }

    // 为了防止重复，使用 map 来记录替换过的字符串
    replaced := make(map[string]bool)

    // 循环替换所有的 UUID
    for _, uuid := range uuids {
        if _, ok := replaced[uuid]; ok {
            continue // 已经替换过了
        }

        // 随机生成一个 24 位字符串来替换 UUID
        randStr := randString(24)

        // 替换 UUID
        content = []byte(strings.ReplaceAll(string(content), uuid, randStr))

        // 记录替换过的 UUID
        replaced[uuid] = true
    }

    // 将修改后的内容写回文件
    err = ioutil.WriteFile(filePath, content, 0644)
    if err != nil {
        return err
    }

    return nil
}

func randString(n int) string {
    rand.Seed(time.Now().UnixNano())
    var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
    b := make([]rune, n)
    for i := range b {
        b[i] = letterRunes[rand.Intn(len(letterRunes))]
    }
    return strings.ToUpper(string(b))
}

func main() {
    filePath := "Runner.xcodeproj/project.pbxproj"
    uuids, err := scanStrings(filePath)
    if err != nil {
        fmt.Println(err)
        return
    }
    uuids = removeDuplicates(uuids) // 去重
    err = replaceUUIDs(filePath, uuids)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println("UUIDs replaced successfully.")
}