import pytest

from tests.helpers.models import ClientCryptograpy
from tests.helpers.resources import WIF, MESSAGE_IN_BYTES


@pytest.mark.crypto
class TestSignAndVerify:
    def test_sign_rfc6979_success(self, client_cryptography: ClientCryptograpy):
        private_key = client_cryptography.key_extension.get_private_key_from_wif(WIF)
        signature = client_cryptography.signer.sign_rfc6979(private_key, MESSAGE_IN_BYTES)
        assert len(signature) == 64, f"Incorrect len of signature, Expected: 64, Actual: {len(signature)}"
        assert isinstance(signature, bytes), f"Not correct type of signature, Expected bytes, Actual: {type(signature)}"

    def test_sign_success(self, client_cryptography: ClientCryptograpy):
        private_key = client_cryptography.key_extension.get_private_key_from_wif(WIF)
        signature = client_cryptography.signer.sign(private_key, MESSAGE_IN_BYTES)
        assert len(signature) == 64, f"Incorrect len of signature, Expected: 64, Actual: {len(signature)}"
        assert isinstance(signature, bytes), f"Not correct type of signature, Expected bytes, Actual: {type(signature)}"

    @pytest.mark.parametrize("message", [MESSAGE_IN_BYTES, b""])
    def test_verify_rfc6979_success(self, client_cryptography: ClientCryptograpy, message: bytes):
        private_key = client_cryptography.key_extension.get_private_key_from_wif(WIF)
        public_key = client_cryptography.key_extension.get_public_key(private_key)

        signature = client_cryptography.signer.sign_rfc6979(private_key, message)
        assert client_cryptography.verifier.verify_rfc6979(public_key, message, signature) is True

    @pytest.mark.parametrize("message", [MESSAGE_IN_BYTES, b""])
    def test_verify_success(self, client_cryptography: ClientCryptograpy, message: bytes):
        private_key = client_cryptography.key_extension.get_private_key_from_wif(WIF)
        public_key = client_cryptography.key_extension.get_public_key(private_key)

        signature = client_cryptography.signer.sign(private_key, message)
        assert client_cryptography.verifier.verify(public_key, message, signature) is True

    # = = = = = = = = = = = = = = = = = = = = = NEGATIVE cases = = = = = = = = = = = = = = = = = = = = =

    def test_verify_empty_public_key(self, client_cryptography: ClientCryptograpy):
        with pytest.raises(ValueError, match="Incorrect public key"):
            client_cryptography.verifier.verify(b'', b"Test message", b"signature")

    def test_verify_invalid_signature(self, client_cryptography: ClientCryptograpy):
        invalid_signature = b"invalid_signature"

        private_key = client_cryptography.key_extension.get_private_key_from_wif(WIF)
        public_key = client_cryptography.key_extension.get_public_key(private_key)
        assert not client_cryptography.verifier.verify(public_key, MESSAGE_IN_BYTES, invalid_signature), "Verified invalid signature"

    def test_sign_empty_key(self, client_cryptography: ClientCryptograpy):
        with pytest.raises(ValueError, match="Incorrect private key"):
            client_cryptography.signer.sign(b'', MESSAGE_IN_BYTES)