package torrent

import (
	"fmt"
	"sort"
)

func getFileIDs(files []*File) []string {
	var fileIDs []int
	for _, file := range files {
		if file.ID != 0 {
			fileIDs = append(fileIDs, file.ID)
		}
	}
	sort.Ints(fileIDs)
	var ret []string
	for _, id := range fileIDs {
		ret = append(ret, fmt.Sprintf("%d", id))
	}
	return ret
}