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package server
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import (
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	"context"
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	"crypto/ecdsa"
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	"crypto/elliptic"
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	"crypto/rand"
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	"crypto/tls"
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	"crypto/x509"
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	"crypto/x509/pkix"
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	"encoding/pem"
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	"math/big"
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	"time"
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	"go.miragespace.co/specter/spec/cipher"
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)
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type SelfSignedProvider struct {
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	cert       *tls.Certificate
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	RootDomain string
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}
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var _ cipher.CertProvider = (*SelfSignedProvider)(nil)
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func (s *SelfSignedProvider) Initialize(_ context.Context) error {
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	priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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	if err != nil {
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		return err
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	}
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	keyDER, err := x509.MarshalECPrivateKey(priv)
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	if err != nil {
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		return err
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	}
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	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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	if err != nil {
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		return err
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	}
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	template := x509.Certificate{
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		SerialNumber: serialNumber,
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		Subject: pkix.Name{
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			Organization: []string{"Dev"},
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		},
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		NotBefore: time.Now(),
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		NotAfter:  time.Now().Add(time.Hour * 24 * 180),
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		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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		BasicConstraintsValid: true,
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		DNSNames: []string{
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			s.RootDomain,
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			"*." + s.RootDomain,
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		},
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	}
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	certDER, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
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	if err != nil {
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		return err
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	}
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	keyPEM := pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: keyDER})
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	certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
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	tlsCert, err := tls.X509KeyPair(certPEM, keyPEM)
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	if err != nil {
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		return err
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	}
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	s.cert = &tlsCert
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	return nil
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}
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func (s *SelfSignedProvider) GetCertificate(_ *tls.ClientHelloInfo) (*tls.Certificate, error) {
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	return s.cert, nil
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}
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func (s *SelfSignedProvider) GetCertificateWithContext(context.Context, *tls.ClientHelloInfo) (*tls.Certificate, error) {
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	return s.cert, nil
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}
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func (s *SelfSignedProvider) OnHandshake(_ cipher.OnHandshakeFunc) {}