package handlers

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

var numberSuffixRegex = regexp.MustCompile(` \(\d+\)$`)

// GetUniquePath checks if a file or folder exists at the given baseDir with the given name.
// If it does, it systematically appends " (1)", " (2)", etc., until it finds an available name.
// It returns the unique filename.
func GetUniquePath(baseDir, name string) string {
	ext := filepath.Ext(name)
	base := name[:len(name)-len(ext)]

	finalPath := filepath.Join(baseDir, name)
	if _, err := os.Stat(finalPath); os.IsNotExist(err) {
		return name
	}

	base = numberSuffixRegex.ReplaceAllString(base, "")

	for i := 1; ; i++ {
		newName := fmt.Sprintf("%s (%d)%s", base, i, ext)
		finalPath = filepath.Join(baseDir, newName)
		if _, err := os.Stat(finalPath); os.IsNotExist(err) {
			return newName
		}
	}
}