//go:build windows

package main

import (
	"path/filepath"
	"regexp"
	"unicode/utf8"
)

// windows 下全路径的字符数上限，留几个字符给后面追加的扩展名
const maxPathRunes = 250

// 转换文件名和限制文件名长度，添加保存文件夹的路径
func transFilename(filename string) string {
	// 转换文件名不允许的特殊字符
	re := regexp.MustCompile(`[<>:"/\\|?*\r\n]`)
	filename = re.ReplaceAllString(filename, "-")
	dir := recordingDir()
	outFilename := filepath.Join(dir, filename)
	if utf8.RuneCountInString(outFilename) <= maxPathRunes {
		return outFilename
	}

	// 路径过长时截断文件名而不是直接放弃录制
	keep := maxPathRunes - utf8.RuneCountInString(dir) - 2
	if keep < 10 {
		lPrintErrf("保存文件夹的路径太长，无法生成文件名：%s", dir)
		return ""
	}
	runes := []rune(filename)
	if len(runes) > keep {
		runes = runes[:keep]
	}
	outFilename = filepath.Join(dir, string(runes))
	lPrintWarnf("文件名过长，已截断为 %s", filepath.Base(outFilename))
	return outFilename
}