package service

import (
	"crypto/rand"
	"encoding/base64"
	"strings"
)

func normalizePage(page, size int) (int, int) {
	if page < 1 {
		page = 1
	}
	if size < 1 || size > 100 {
		size = 20
	}
	return page, size
}

func randomToken(prefix string, byteCount int) (string, error) {
	raw := make([]byte, byteCount)
	if _, err := rand.Read(raw); err != nil {
		return "", err
	}
	return prefix + base64.RawURLEncoding.EncodeToString(raw), nil
}

func scopeList(scopes string) []string {
	set := ParseScopes(scopes)
	items := make([]string, 0, len(set))
	for scope := range set {
		items = append(items, scope)
	}
	return items
}

func fallbackName(value, fallback string) string {
	if strings.TrimSpace(value) != "" {
		return strings.TrimSpace(value)
	}
	return fallback
}

// IsLegacyLewanMirrorSKU 判断是否为历史乐玩镜像 sku（LEWAN_*/lewan_*）。
// 对外目录应使用英文主 sku；乐玩只作为履约配置挂接。
func IsLegacyLewanMirrorSKU(sku string) bool {
	normalized := strings.ToLower(strings.TrimSpace(sku))
	return strings.HasPrefix(normalized, "lewan_")
}