"""
Test unitari per app.core.security.
"""

import os
import pytest

# Override variabili d'ambiente per i test (prima di importare app)
os.environ["ENCRYPTION_KEY"] = "a" * 64
os.environ["SECRET_KEY"] = "test-secret-key-for-unit-tests-only"
os.environ["DATABASE_URL"] = "postgresql+asyncpg://test:test@localhost:5432/test"
os.environ["DATABASE_URL_SYNC"] = "postgresql://test:test@localhost:5432/test"

from app.core.security import (
    hash_password,
    verify_password,
    create_access_token,
    create_refresh_token,
    decode_token,
    encrypt_credential,
    decrypt_credential,
    hash_token,
)


class TestPasswordHashing:
    def test_hash_password_returns_bcrypt_hash(self):
        hashed = hash_password("MySecurePassword1!")
        assert hashed.startswith("$2b$")
        assert len(hashed) > 20

    def test_verify_correct_password(self):
        password = "MySecurePassword1!"
        hashed = hash_password(password)
        assert verify_password(password, hashed) is True

    def test_verify_wrong_password(self):
        hashed = hash_password("CorrectPassword1!")
        assert verify_password("WrongPassword1!", hashed) is False

    def test_hash_is_different_each_time(self):
        """Bcrypt usa salt casuale: due hash dello stesso secret sono diversi."""
        p = "SamePassword1!"
        h1 = hash_password(p)
        h2 = hash_password(p)
        assert h1 != h2
        # Ma entrambi verificano correttamente
        assert verify_password(p, h1)
        assert verify_password(p, h2)


class TestJWT:
    def test_create_and_decode_access_token(self):
        import uuid
        user_id = uuid.uuid4()
        tenant_id = uuid.uuid4()
        token = create_access_token(
            subject=user_id,
            tenant_id=tenant_id,
            role="admin",
        )
        payload = decode_token(token)
        assert payload["sub"] == str(user_id)
        assert payload["tid"] == str(tenant_id)
        assert payload["role"] == "admin"
        assert payload["type"] == "access"

    def test_create_and_decode_refresh_token(self):
        import uuid
        user_id = uuid.uuid4()
        tenant_id = uuid.uuid4()
        token = create_refresh_token(subject=user_id, tenant_id=tenant_id)
        payload = decode_token(token)
        assert payload["sub"] == str(user_id)
        assert payload["type"] == "refresh"

    def test_expired_token_raises(self):
        from datetime import UTC, datetime, timedelta
        from jose import jwt
        from app.config import get_settings
        from jose import JWTError

        settings = get_settings()
        payload = {
            "sub": "user-id",
            "tid": "tenant-id",
            "type": "access",
            "exp": datetime.now(UTC) - timedelta(seconds=1),  # già scaduto
        }
        token = jwt.encode(payload, settings.secret_key, algorithm=settings.algorithm)
        with pytest.raises(JWTError):
            decode_token(token)

    def test_invalid_signature_raises(self):
        from jose import JWTError
        with pytest.raises(JWTError):
            decode_token("this.is.not.a.valid.token")


class TestAESEncryption:
    def test_encrypt_decrypt_roundtrip(self):
        secret = "imap_password_super_secret_123!"
        encrypted = encrypt_credential(secret)
        decrypted = decrypt_credential(encrypted)
        assert decrypted == secret

    def test_encrypt_produces_different_output_each_time(self):
        """Nonce casuale garantisce che due cifrature dello stesso plaintext siano diverse."""
        secret = "same_secret"
        enc1 = encrypt_credential(secret)
        enc2 = encrypt_credential(secret)
        assert enc1 != enc2
        # Ma entrambi decifrano correttamente
        assert decrypt_credential(enc1) == secret
        assert decrypt_credential(enc2) == secret

    def test_decrypt_with_wrong_data_raises(self):
        with pytest.raises(ValueError):
            decrypt_credential("dGhpcyBpcyBub3QgdmFsaWQgYWVzIGRhdGE=")

    def test_encrypt_empty_string(self):
        encrypted = encrypt_credential("")
        decrypted = decrypt_credential(encrypted)
        assert decrypted == ""

    def test_encrypt_unicode_string(self):
        secret = "pàssword_con_àccenti_è_ù!"
        encrypted = encrypt_credential(secret)
        decrypted = decrypt_credential(encrypted)
        assert decrypted == secret


class TestHashToken:
    def test_hash_is_deterministic(self):
        token = "my_refresh_token"
        assert hash_token(token) == hash_token(token)

    def test_different_tokens_different_hashes(self):
        assert hash_token("token1") != hash_token("token2")

    def test_hash_is_64_chars(self):
        """SHA-256 produce 32 bytes = 64 caratteri hex."""
        assert len(hash_token("any_token")) == 64
