"""Unit tests for PinService."""

import uuid
from datetime import UTC, datetime

import pytest

from app.modules.loyalty.exceptions import (
    InvalidStaffPinException,
    StaffPinLockedException,
)
from app.modules.loyalty.models import LoyaltyProgram, StaffPin
from app.modules.loyalty.models.loyalty_program import LoyaltyType
from app.modules.loyalty.schemas.pin import PinCreate
from app.modules.loyalty.services.pin_service import PinService
from app.modules.tenancy.models import Merchant, Store, User
from app.modules.tenancy.models.store import StoreUser


@pytest.mark.unit
@pytest.mark.loyalty
class TestPinService:
    """Test suite for PinService."""

    def setup_method(self):
        self.service = PinService()

    def test_service_instantiation(self):
        """Service can be instantiated."""
        assert self.service is not None


# ============================================================================
# Fixtures
# ============================================================================


@pytest.fixture
def pin_setup(db):
    """Create a full setup for PIN tests."""
    from middleware.auth import AuthManager

    auth = AuthManager()
    uid = uuid.uuid4().hex[:8]

    owner = User(
        email=f"pinowner_{uid}@test.com",
        username=f"pinowner_{uid}",
        hashed_password=auth.hash_password("testpass"),
        role="merchant_owner",
        is_active=True,
        is_email_verified=True,
    )
    db.add(owner)
    db.commit()
    db.refresh(owner)

    merchant = Merchant(
        name=f"PIN Merchant {uid}",
        owner_user_id=owner.id,
        contact_email=owner.email,
        is_active=True,
        is_verified=True,
    )
    db.add(merchant)
    db.commit()
    db.refresh(merchant)

    store = Store(
        merchant_id=merchant.id,
        store_code=f"PIN_{uid.upper()}",
        subdomain=f"pin{uid}",
        name=f"PIN Store {uid}",
        is_active=True,
        is_verified=True,
    )
    db.add(store)
    db.commit()
    db.refresh(store)

    store_user = StoreUser(store_id=store.id, user_id=owner.id, is_active=True)
    db.add(store_user)
    db.commit()

    program = LoyaltyProgram(
        merchant_id=merchant.id,
        loyalty_type=LoyaltyType.POINTS.value,
        points_per_euro=10,
        cooldown_minutes=0,
        max_daily_stamps=10,
        require_staff_pin=True,
        card_name="PIN Card",
        card_color="#00FF00",
        is_active=True,
    )
    db.add(program)
    db.commit()
    db.refresh(program)

    return {
        "merchant": merchant,
        "store": store,
        "program": program,
    }


# ============================================================================
# Create / Unlock Tests
# ============================================================================


@pytest.mark.unit
@pytest.mark.loyalty
class TestCreatePin:
    """Tests for create_pin."""

    def setup_method(self):
        self.service = PinService()

    def test_create_pin(self, db, pin_setup):
        """Create a staff PIN."""
        program = pin_setup["program"]
        store = pin_setup["store"]

        data = PinCreate(name="Alice", staff_id="EMP001", pin="1234")
        pin = self.service.create_pin(db, program.id, store.id, data)

        assert pin.id is not None
        assert pin.name == "Alice"
        assert pin.staff_id == "EMP001"
        assert pin.verify_pin("1234")

    def test_unlock_pin(self, db, pin_setup):
        """Unlock a locked PIN."""
        program = pin_setup["program"]
        store = pin_setup["store"]

        data = PinCreate(name="Bob", staff_id="EMP002", pin="5678")
        pin = self.service.create_pin(db, program.id, store.id, data)

        # Lock it
        pin.failed_attempts = 5
        from datetime import timedelta
        pin.locked_until = datetime.now(UTC) + timedelta(minutes=30)
        db.commit()

        assert pin.is_locked

        # Unlock
        unlocked = self.service.unlock_pin(db, pin.id)
        assert unlocked.failed_attempts == 0
        assert unlocked.locked_until is None
        assert not unlocked.is_locked


# ============================================================================
# Verify PIN Tests
# ============================================================================


@pytest.mark.unit
@pytest.mark.loyalty
class TestVerifyPin:
    """Tests for verify_pin."""

    def setup_method(self):
        self.service = PinService()

    def test_verify_pin_success(self, db, pin_setup):
        """Correct PIN verifies successfully."""
        program = pin_setup["program"]
        store = pin_setup["store"]

        data = PinCreate(name="Charlie", staff_id="EMP003", pin="1111")
        self.service.create_pin(db, program.id, store.id, data)

        result = self.service.verify_pin(db, program.id, "1111", store_id=store.id)
        assert result.name == "Charlie"

    def test_verify_pin_wrong_single_failure(self, db, pin_setup):
        """Wrong PIN records failure on ONE pin only, not all."""
        program = pin_setup["program"]
        store = pin_setup["store"]

        # Create two PINs
        self.service.create_pin(db, program.id, store.id, PinCreate(name="A", pin="1111"))
        self.service.create_pin(db, program.id, store.id, PinCreate(name="B", pin="2222"))

        # Wrong PIN
        with pytest.raises(InvalidStaffPinException):
            self.service.verify_pin(db, program.id, "9999", store_id=store.id)

        # Only one PIN should have failed_attempts incremented
        pins = self.service.list_pins(db, program.id, store_id=store.id, is_active=True)
        failed_counts = [p.failed_attempts for p in pins]
        assert sum(failed_counts) == 1  # Only 1 PIN got the failure, not both

    def test_verify_pin_lockout(self, db, pin_setup):
        """After max failures, PIN gets locked."""
        program = pin_setup["program"]
        store = pin_setup["store"]

        self.service.create_pin(db, program.id, store.id, PinCreate(name="Lock", pin="3333"))

        # Fail 5 times (default max)
        for _ in range(5):
            try:
                self.service.verify_pin(db, program.id, "9999", store_id=store.id)
            except (InvalidStaffPinException, StaffPinLockedException):
                pass

        # Next attempt should be locked
        with pytest.raises((InvalidStaffPinException, StaffPinLockedException)):
            self.service.verify_pin(db, program.id, "9999", store_id=store.id)

    def test_verify_skips_locked_pins(self, db, pin_setup):
        """Locked PINs are skipped during verification."""
        program = pin_setup["program"]
        store = pin_setup["store"]

        from datetime import timedelta

        # Create a locked PIN and an unlocked one
        data1 = PinCreate(name="Locked", pin="1111")
        pin1 = self.service.create_pin(db, program.id, store.id, data1)
        pin1.locked_until = datetime.now(UTC) + timedelta(minutes=30)
        pin1.failed_attempts = 5
        db.commit()

        data2 = PinCreate(name="Active", pin="2222")
        self.service.create_pin(db, program.id, store.id, data2)

        # Should find the active PIN
        result = self.service.verify_pin(db, program.id, "2222", store_id=store.id)
        assert result.name == "Active"


# ============================================================================
# Item 11: Merchant-specific PIN lockout settings
# ============================================================================


@pytest.mark.unit
@pytest.mark.loyalty
class TestVerifyPinMerchantSettings:
    """Tests for verify_pin using merchant-specific lockout settings."""

    def setup_method(self):
        self.service = PinService()

    def test_uses_merchant_lockout_attempts(self, db, pin_setup):
        """Failed attempts use merchant settings, not global config."""
        from app.modules.loyalty.models import MerchantLoyaltySettings

        program = pin_setup["program"]
        store = pin_setup["store"]
        merchant = pin_setup["merchant"]

        # Create merchant settings with low lockout threshold
        settings = MerchantLoyaltySettings(
            merchant_id=merchant.id,
            staff_pin_lockout_attempts=3,
            staff_pin_lockout_minutes=60,
        )
        db.add(settings)
        db.commit()

        self.service.create_pin(db, program.id, store.id, PinCreate(name="Test", pin="1234"))

        # Fail 3 times (merchant setting), should lock
        for _ in range(3):
            try:
                self.service.verify_pin(db, program.id, "9999", store_id=store.id)
            except (InvalidStaffPinException, StaffPinLockedException):
                pass

        # Next attempt should be locked
        with pytest.raises((InvalidStaffPinException, StaffPinLockedException)):
            self.service.verify_pin(db, program.id, "9999", store_id=store.id)

        # Verify the PIN is actually locked
        pins = self.service.list_pins(db, program.id, store_id=store.id, is_active=True)
        locked_pins = [p for p in pins if p.is_locked]
        assert len(locked_pins) >= 1