package config

import (
	"fmt"
	"strings"

	"filippo.io/age"
	"filippo.io/age/agessh"
)

// ParseBackupRecipients reads backup_recipients: age recipients, or SSH
// public keys.
func ParseBackupRecipients(list []string) ([]age.Recipient, error) {
	var out []age.Recipient
	for i, s := range list {
		s = strings.TrimSpace(s)
		if strings.HasPrefix(s, "ssh-") {
			r, err := agessh.ParseRecipient(s)
			if err != nil {
				return nil, fmt.Errorf("backup_recipients[%d]: %w", i, err)
			}
			out = append(out, r)
			continue
		}
		rs, err := age.ParseRecipients(strings.NewReader(s))
		if err != nil || len(rs) != 1 {
			return nil, fmt.Errorf("backup_recipients[%d] is not an age recipient (age1…) or an SSH public key", i)
		}
		out = append(out, rs[0])
	}
	return out, nil
}