//go:build darwin
// +build darwin

package macse

import (
	"bytes"
	"testing"
)

const testKeyLabel = "berlin.sneak.app.secret.test.se-key"

// testKeyHash stores the hash of the created test key for cleanup.
var testKeyHash string //nolint:gochecknoglobals

// skipIfNoSecureEnclave skips the test if SE access is unavailable.
func skipIfNoSecureEnclave(t *testing.T) {
	t.Helper()

	probeLabel := "berlin.sneak.app.secret.test.se-probe"
	_, hash, err := CreateKey(probeLabel)
	if err != nil {
		t.Skipf("Secure Enclave unavailable (skipping): %v", err)
	}

	if hash != "" {
		_ = DeleteKey(hash)
	}
}

func TestCreateAndDeleteKey(t *testing.T) {
	skipIfNoSecureEnclave(t)

	if testKeyHash != "" {
		_ = DeleteKey(testKeyHash)
	}

	pubKey, hash, err := CreateKey(testKeyLabel)
	if err != nil {
		t.Fatalf("CreateKey failed: %v", err)
	}

	testKeyHash = hash
	t.Logf("Created key with hash: %s", hash)

	// Verify valid uncompressed P-256 public key
	if len(pubKey) != p256UncompressedKeySize {
		t.Fatalf("expected public key length %d, got %d", p256UncompressedKeySize, len(pubKey))
	}

	if pubKey[0] != 0x04 {
		t.Fatalf("expected uncompressed point prefix 0x04, got 0x%02x", pubKey[0])
	}

	if hash == "" {
		t.Fatal("expected non-empty hash")
	}

	// Delete the key
	if err := DeleteKey(hash); err != nil {
		t.Fatalf("DeleteKey failed: %v", err)
	}

	testKeyHash = ""
	t.Log("Key created, verified, and deleted successfully")
}

func TestEncryptDecryptRoundTrip(t *testing.T) {
	skipIfNoSecureEnclave(t)

	_, hash, err := CreateKey(testKeyLabel)
	if err != nil {
		t.Fatalf("CreateKey failed: %v", err)
	}

	testKeyHash = hash

	defer func() {
		if testKeyHash != "" {
			_ = DeleteKey(testKeyHash)
			testKeyHash = ""
		}
	}()

	// Test data simulating an age private key
	plaintext := []byte("AGE-SECRET-KEY-1QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ")

	// Encrypt
	ciphertext, err := Encrypt(testKeyLabel, plaintext)
	if err != nil {
		t.Fatalf("Encrypt failed: %v", err)
	}

	t.Logf("Plaintext: %d bytes, Ciphertext: %d bytes", len(plaintext), len(ciphertext))

	if bytes.Equal(ciphertext, plaintext) {
		t.Fatal("ciphertext should differ from plaintext")
	}

	// Decrypt
	decrypted, err := Decrypt(testKeyLabel, ciphertext)
	if err != nil {
		t.Fatalf("Decrypt failed: %v", err)
	}

	if !bytes.Equal(decrypted, plaintext) {
		t.Fatalf("decrypted data does not match original plaintext")
	}

	t.Log("ECIES encrypt/decrypt round-trip successful")
}

func TestEncryptProducesDifferentCiphertexts(t *testing.T) {
	skipIfNoSecureEnclave(t)

	_, hash, err := CreateKey(testKeyLabel)
	if err != nil {
		t.Fatalf("CreateKey failed: %v", err)
	}

	testKeyHash = hash

	defer func() {
		if testKeyHash != "" {
			_ = DeleteKey(testKeyHash)
			testKeyHash = ""
		}
	}()

	plaintext := []byte("test-secret-data")

	ct1, err := Encrypt(testKeyLabel, plaintext)
	if err != nil {
		t.Fatalf("first Encrypt failed: %v", err)
	}

	ct2, err := Encrypt(testKeyLabel, plaintext)
	if err != nil {
		t.Fatalf("second Encrypt failed: %v", err)
	}

	// ECIES uses a random ephemeral key each time, so ciphertexts should differ
	if bytes.Equal(ct1, ct2) {
		t.Fatal("two encryptions of same plaintext should produce different ciphertexts")
	}

	// Both should decrypt to the same plaintext
	dec1, err := Decrypt(testKeyLabel, ct1)
	if err != nil {
		t.Fatalf("first Decrypt failed: %v", err)
	}

	dec2, err := Decrypt(testKeyLabel, ct2)
	if err != nil {
		t.Fatalf("second Decrypt failed: %v", err)
	}

	if !bytes.Equal(dec1, plaintext) || !bytes.Equal(dec2, plaintext) {
		t.Fatal("both ciphertexts should decrypt to original plaintext")
	}

	t.Log("ECIES correctly produces different ciphertexts that decrypt to same plaintext")
}