package notify

import (
	"encoding/base64"

	webpush "github.com/SherClockHolmes/webpush-go"
)

// GenerateVAPIDKeys generates a VAPID key pair for web push notifications.
// Returns the base64url-encoded public and private keys.
// Note: webpush.GenerateVAPIDKeys returns (privateKey, publicKey) — we swap here.
func GenerateVAPIDKeys() (publicKey, privateKey string, err error) {
	privateKey, publicKey, err = webpush.GenerateVAPIDKeys()
	return
}

// ValidateVAPIDPublicKey reports whether key is a valid VAPID public key:
// a base64url-encoded 65-byte uncompressed P-256 point (starts with 0x04).
func ValidateVAPIDPublicKey(key string) bool {
	b, err := base64.RawURLEncoding.DecodeString(key)
	if err != nil {
		return false
	}
	return len(b) == 65 && b[0] == 0x04
}