package clusterauth

import (
	"encoding/json"
	"errors"
	"testing"
	"time"
)

func TestSignAndVerifyRawPayload(t *testing.T) {
	keys, err := GenerateKeyPair()
	if err != nil {
		t.Fatalf("GenerateKeyPair: %v", err)
	}
	payload := json.RawMessage(`{"cluster_id":"cluster-1","schema_version":"test.v1","value":1}`)

	signature, err := SignRaw(keys.PrivateKeyB64, payload, time.Date(2026, 4, 28, 12, 0, 0, 0, time.UTC))
	if err != nil {
		t.Fatalf("SignRaw: %v", err)
	}
	if signature.KeyFingerprint != keys.Fingerprint {
		t.Fatalf("fingerprint = %q, want %q", signature.KeyFingerprint, keys.Fingerprint)
	}
	if err := VerifyRaw(keys.PublicKeyB64, payload, signature); err != nil {
		t.Fatalf("VerifyRaw: %v", err)
	}
}

func TestVerifyRawRejectsTamperedPayload(t *testing.T) {
	keys, err := GenerateKeyPair()
	if err != nil {
		t.Fatalf("GenerateKeyPair: %v", err)
	}
	payload := json.RawMessage(`{"cluster_id":"cluster-1","schema_version":"test.v1","value":1}`)
	signature, err := SignRaw(keys.PrivateKeyB64, payload, time.Date(2026, 4, 28, 12, 0, 0, 0, time.UTC))
	if err != nil {
		t.Fatalf("SignRaw: %v", err)
	}

	tampered := json.RawMessage(`{"cluster_id":"cluster-1","schema_version":"test.v1","value":2}`)
	if err := VerifyRaw(keys.PublicKeyB64, tampered, signature); !errors.Is(err, ErrInvalidSignature) {
		t.Fatalf("err = %v, want ErrInvalidSignature", err)
	}
}