package util

import (
	e "codeberg.org/pebbe/errors"

	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"strings"
)

var (
	p      = e.PanicErr
	reEOL  = regexp.MustCompile(`[.!?]['"”’]?$`)
	reNEOL = regexp.MustCompile(`[.!?]['"”’]?\p{Lu}\p{Ll}`)
	reLET  = regexp.MustCompile(`\p{Lu}`)
)

func AddEnd(s string) string {
	s = strings.TrimSpace(s)
	if s == "" {
		return ""
	}
	if reEOL.MatchString(s) {
		return s + "\n"
	}
	return s + ".\n"
}

func FixSpace(s string) string {
	s = strings.Join(strings.Fields(s), " ")
	s = reNEOL.ReplaceAllStringFunc(s, func(s1 string) string {
		i := reLET.FindStringIndex(s1)[0]
		return s1[:i] + " " + s1[i:]
	})
	return s
}

func MkLock(filename string) {
	pid := os.Getpid()
	link := fmt.Sprintf("%s.%d", filepath.Base(filename), pid)
	p(os.Symlink(link, filename))

	name, err := os.Readlink(filename)
	p(err)

	if name != link {
		p(fmt.Errorf("wrong lock name %q, should be %q", name, link))
	}
}