package authority

import (
	"crypto/ed25519"
	"encoding/base64"
	"encoding/json"
	"errors"
	"testing"
)

func TestVerifyRawAcceptsSignedPayload(t *testing.T) {
	publicKey, privateKey, err := ed25519.GenerateKey(nil)
	if err != nil {
		t.Fatalf("GenerateKey: %v", err)
	}
	payload := json.RawMessage(`{"cluster_id":"cluster-1","schema_version":"test.v1"}`)
	canonical, err := CanonicalJSON(payload)
	if err != nil {
		t.Fatalf("CanonicalJSON: %v", err)
	}
	signature := Signature{
		SchemaVersion:  SignatureSchemaVersion,
		Algorithm:      AlgorithmEd25519,
		KeyFingerprint: Fingerprint(publicKey),
		Signature:      base64.StdEncoding.EncodeToString(ed25519.Sign(privateKey, canonical)),
	}
	if err := VerifyRaw(base64.StdEncoding.EncodeToString(publicKey), payload, signature); err != nil {
		t.Fatalf("VerifyRaw: %v", err)
	}
}

func TestVerifyRawRejectsTamperedPayload(t *testing.T) {
	publicKey, privateKey, err := ed25519.GenerateKey(nil)
	if err != nil {
		t.Fatalf("GenerateKey: %v", err)
	}
	payload := json.RawMessage(`{"cluster_id":"cluster-1","schema_version":"test.v1"}`)
	canonical, err := CanonicalJSON(payload)
	if err != nil {
		t.Fatalf("CanonicalJSON: %v", err)
	}
	signature := Signature{
		SchemaVersion:  SignatureSchemaVersion,
		Algorithm:      AlgorithmEd25519,
		KeyFingerprint: Fingerprint(publicKey),
		Signature:      base64.StdEncoding.EncodeToString(ed25519.Sign(privateKey, canonical)),
	}
	tampered := json.RawMessage(`{"cluster_id":"cluster-2","schema_version":"test.v1"}`)
	if err := VerifyRaw(base64.StdEncoding.EncodeToString(publicKey), tampered, signature); !errors.Is(err, ErrInvalidSignature) {
		t.Fatalf("err = %v, want ErrInvalidSignature", err)
	}
}