package service

import (
	"fmt"
	"strings"
)

// deduplicate removes duplicates from a string slice.
func deduplicate(s []string) []string {
	if len(s) == 0 {
		return s
	}
	seen := make(map[string]bool, len(s))
	out := make([]string, 0, len(s))
	for _, v := range s {
		if !seen[v] {
			seen[v] = true
			out = append(out, v)
		}
	}
	return out
}

func nonEmptyStrings(values ...string) []string {
	out := make([]string, 0, len(values))
	for _, value := range values {
		value = strings.TrimSpace(value)
		if value != "" {
			out = append(out, value)
		}
	}
	return out
}

func genreIDStrings(ids []int) []string {
	if len(ids) == 0 {
		return nil
	}
	out := make([]string, 0, len(ids))
	for _, id := range ids {
		if id > 0 {
			out = append(out, fmt.Sprint(id))
		}
	}
	return out
}