# tests/test_inventory_service.py
import uuid

import pytest

from app.exceptions import (
    InsufficientInventoryException,
    InvalidQuantityException,
    InventoryNotFoundException,
    InventoryValidationException,
)
from app.services.inventory_service import InventoryService
from models.database.inventory import Inventory
from models.database.marketplace_product import MarketplaceProduct
from models.schema.inventory import InventoryAdd, InventoryCreate, InventoryUpdate


@pytest.mark.unit
@pytest.mark.inventory
class TestInventoryService:
    def setup_method(self):
        self.service = InventoryService()

    def test_normalize_gtin_invalid(self):
        """Test GTIN normalization with invalid GTINs."""
        # Completely invalid values that should return None
        assert self.service._normalize_gtin("invalid") is None
        assert self.service._normalize_gtin("abcdef") is None
        assert self.service._normalize_gtin("") is None
        assert self.service._normalize_gtin(None) is None
        assert self.service._normalize_gtin("   ") is None  # Only whitespace
        assert self.service._normalize_gtin("!@#$%") is None  # Only special characters

        # Mixed invalid characters that become empty after filtering
        assert self.service._normalize_gtin("abc-def-ghi") is None  # No digits

    def test_normalize_gtin_valid(self):
        """Test GTIN normalization with valid GTINs."""
        # Test various valid GTIN formats - these should remain unchanged
        assert (
            self.service._normalize_gtin("1234567890123") == "1234567890123"
        )  # EAN-13
        assert self.service._normalize_gtin("123456789012") == "123456789012"  # UPC-A
        assert self.service._normalize_gtin("12345678") == "12345678"  # EAN-8
        assert (
            self.service._normalize_gtin("12345678901234") == "12345678901234"
        )  # GTIN-14

        # Test with decimal points (should be removed)
        assert self.service._normalize_gtin("1234567890123.0") == "1234567890123"

        # Test with whitespace (should be trimmed)
        assert self.service._normalize_gtin("  1234567890123  ") == "1234567890123"

        # Test short GTINs being padded
        assert (
            self.service._normalize_gtin("123") == "0000000000123"
        )  # Padded to EAN-13
        assert (
            self.service._normalize_gtin("12345") == "0000000012345"
        )  # Padded to EAN-13

        # Test long GTINs being truncated
        assert (
            self.service._normalize_gtin("123456789012345") == "3456789012345"
        )  # Truncated to 13

    def test_normalize_gtin_edge_cases(self):
        """Test GTIN normalization edge cases."""
        # Test numeric inputs
        assert self.service._normalize_gtin(1234567890123) == "1234567890123"
        assert self.service._normalize_gtin(123) == "0000000000123"

        # Test mixed valid/invalid characters
        assert (
            self.service._normalize_gtin("123-456-789-012") == "123456789012"
        )  # Dashes removed
        assert (
            self.service._normalize_gtin("123 456 789 012") == "123456789012"
        )  # Spaces removed
        assert (
            self.service._normalize_gtin("ABC123456789012DEF") == "123456789012"
        )  # Letters removed

    def test_set_inventory_new_entry_success(self, db):
        """Test setting inventory for a new GTIN/location combination successfully."""
        unique_id = str(uuid.uuid4())[:8]
        inventory_data = InventoryCreate(
            gtin="1234567890123", location=f"WAREHOUSE_A_{unique_id}", quantity=100
        )

        result = self.service.set_inventory(db, inventory_data)

        assert result.gtin == "1234567890123"
        assert result.location.upper() == f"WAREHOUSE_A_{unique_id}".upper()
        assert result.quantity == 100

    def test_set_inventory_existing_entry_success(self, db, test_inventory):
        """Test setting inventory for an existing GTIN/location combination successfully."""
        inventory_data = InventoryCreate(
            gtin=test_inventory.gtin,
            location=test_inventory.location,  # Use exact same location as test_inventory
            quantity=200,
        )

        result = self.service.set_inventory(db, inventory_data)

        assert result.gtin == test_inventory.gtin
        assert result.location == test_inventory.location
        assert result.quantity == 200  # Should replace the original quantity

    def test_set_inventory_invalid_gtin_validation_error(self, db):
        """Test setting inventory with invalid GTIN returns InventoryValidationException."""
        inventory_data = InventoryCreate(
            gtin="invalid_gtin", location="WAREHOUSE_A", quantity=100
        )

        with pytest.raises(InventoryValidationException) as exc_info:
            self.service.set_inventory(db, inventory_data)

        assert exc_info.value.error_code == "INVENTORY_VALIDATION_FAILED"
        assert "Invalid GTIN format" in str(exc_info.value)
        assert exc_info.value.details.get("field") == "gtin"

    def test_set_inventory_invalid_quantity_error(self, db):
        """Test setting inventory with invalid quantity through service validation."""

        # Test the service validation directly instead of going through Pydantic schema
        # This bypasses the Pydantic validation to test service layer validation

        # Create a mock inventory data object that bypasses Pydantic validation
        class MockInventoryData:
            def __init__(self, gtin, location, quantity):
                self.gtin = gtin
                self.location = location
                self.quantity = quantity

        mock_inventory_data = MockInventoryData("1234567890123", "WAREHOUSE_A", -10)

        # Test the internal validation method directly
        with pytest.raises(InvalidQuantityException) as exc_info:
            self.service._validate_quantity(-10, allow_zero=True)

        assert exc_info.value.error_code == "INVALID_QUANTITY"
        assert "Quantity cannot be negative" in str(exc_info.value)
        assert exc_info.value.details.get("quantity") == -10

    def test_add_inventory_new_entry_success(self, db):
        """Test adding inventory for a new GTIN/location combination successfully."""
        unique_id = str(uuid.uuid4())[:8]
        inventory_data = InventoryAdd(
            gtin="1234567890123", location=f"WAREHOUSE_B_{unique_id}", quantity=50
        )

        result = self.service.add_inventory(db, inventory_data)

        assert result.gtin == "1234567890123"
        assert result.location.upper() == f"WAREHOUSE_B_{unique_id}".upper()
        assert result.quantity == 50

    def test_add_inventory_existing_entry_success(self, db, test_inventory):
        """Test adding inventory to an existing GTIN/location combination successfully."""
        original_quantity = test_inventory.quantity
        inventory_data = InventoryAdd(
            gtin=test_inventory.gtin,
            location=test_inventory.location,  # Use exact same location as test_inventory
            quantity=25,
        )

        result = self.service.add_inventory(db, inventory_data)

        assert result.gtin == test_inventory.gtin
        assert result.location == test_inventory.location
        assert result.quantity == original_quantity + 25

    def test_add_inventory_invalid_gtin_validation_error(self, db):
        """Test adding inventory with invalid GTIN returns InventoryValidationException."""
        inventory_data = InventoryAdd(
            gtin="invalid_gtin", location="WAREHOUSE_A", quantity=50
        )

        with pytest.raises(InventoryValidationException) as exc_info:
            self.service.add_inventory(db, inventory_data)

        assert exc_info.value.error_code == "INVENTORY_VALIDATION_FAILED"
        assert "Invalid GTIN format" in str(exc_info.value)

    def test_add_inventory_invalid_quantity_error(self, db):
        """Test adding inventory with invalid quantity through service validation."""
        # Test zero quantity which should fail for add_inventory (doesn't allow zero)
        # This tests the service validation: allow_zero=False for add operations
        with pytest.raises(InvalidQuantityException) as exc_info:
            self.service._validate_quantity(0, allow_zero=False)

        assert exc_info.value.error_code == "INVALID_QUANTITY"
        assert "Quantity must be positive" in str(exc_info.value)

    def test_remove_inventory_success(self, db, test_inventory):
        """Test removing inventory successfully."""
        original_quantity = test_inventory.quantity
        remove_quantity = min(
            10, original_quantity
        )  # Ensure we don't remove more than available

        inventory_data = InventoryAdd(
            gtin=test_inventory.gtin,
            location=test_inventory.location,  # Use exact same location as test_inventory
            quantity=remove_quantity,
        )

        result = self.service.remove_inventory(db, inventory_data)

        assert result.gtin == test_inventory.gtin
        assert result.location == test_inventory.location
        assert result.quantity == original_quantity - remove_quantity

    def test_remove_inventory_insufficient_inventory_error(self, db, test_inventory):
        """Test removing more inventory than available returns InsufficientInventoryException."""
        inventory_data = InventoryAdd(
            gtin=test_inventory.gtin,
            location=test_inventory.location,  # Use exact same location as test_inventory
            quantity=test_inventory.quantity + 10,  # More than available
        )

        with pytest.raises(InsufficientInventoryException) as exc_info:
            self.service.remove_inventory(db, inventory_data)

        assert exc_info.value.error_code == "INSUFFICIENT_INVENTORY"
        assert exc_info.value.details["gtin"] == test_inventory.gtin
        assert exc_info.value.details["location"] == test_inventory.location
        assert (
            exc_info.value.details["requested_quantity"] == test_inventory.quantity + 10
        )
        assert exc_info.value.details["available_quantity"] == test_inventory.quantity

    def test_remove_inventory_nonexistent_entry_not_found(self, db):
        """Test removing inventory from non-existent GTIN/location returns InventoryNotFoundException."""
        unique_id = str(uuid.uuid4())[:8]
        inventory_data = InventoryAdd(
            gtin="9999999999999", location=f"NONEXISTENT_{unique_id}", quantity=10
        )

        with pytest.raises(InventoryNotFoundException) as exc_info:
            self.service.remove_inventory(db, inventory_data)

        assert exc_info.value.error_code == "INVENTORY_NOT_FOUND"
        assert "9999999999999" in str(exc_info.value)
        assert exc_info.value.details["resource_type"] == "Inventory"

    def test_remove_inventory_invalid_gtin_validation_error(self, db):
        """Test removing inventory with invalid GTIN returns InventoryValidationException."""
        inventory_data = InventoryAdd(
            gtin="invalid_gtin", location="WAREHOUSE_A", quantity=10
        )

        with pytest.raises(InventoryValidationException) as exc_info:
            self.service.remove_inventory(db, inventory_data)

        assert exc_info.value.error_code == "INVENTORY_VALIDATION_FAILED"
        assert "Invalid GTIN format" in str(exc_info.value)

    def test_remove_inventory_negative_result_error(self, db, test_inventory):
        """Test removing inventory that would result in negative quantity returns NegativeInventoryException."""
        # This is handled by InsufficientInventoryException, but test the logic
        inventory_data = InventoryAdd(
            gtin=test_inventory.gtin,
            location=test_inventory.location,
            quantity=test_inventory.quantity + 1,  # One more than available
        )

        with pytest.raises(InsufficientInventoryException) as exc_info:
            self.service.remove_inventory(db, inventory_data)

        # The service prevents negative inventory through InsufficientInventoryException
        assert exc_info.value.error_code == "INSUFFICIENT_INVENTORY"

    def test_get_inventory_by_gtin_success(
        self, db, test_inventory, test_marketplace_product
    ):
        """Test getting inventory summary by GTIN successfully."""
        result = self.service.get_inventory_by_gtin(db, test_inventory.gtin)

        assert result.gtin == test_inventory.gtin
        assert result.total_quantity == test_inventory.quantity
        assert len(result.locations) == 1
        assert result.locations[0].location == test_inventory.location
        assert result.locations[0].quantity == test_inventory.quantity
        assert result.product_title == test_marketplace_product.title

    def test_get_inventory_by_gtin_multiple_locations_success(
        self, db, test_marketplace_product
    ):
        """Test getting inventory summary with multiple locations successfully."""
        unique_gtin = test_marketplace_product.gtin
        unique_id = str(uuid.uuid4())[:8]

        # Create multiple inventory entries for the same GTIN with unique locations
        inventory1 = Inventory(
            gtin=unique_gtin, location=f"WAREHOUSE_A_{unique_id}", quantity=50
        )
        inventory2 = Inventory(
            gtin=unique_gtin, location=f"WAREHOUSE_B_{unique_id}", quantity=30
        )

        db.add(inventory1)
        db.add(inventory2)
        db.commit()

        result = self.service.get_inventory_by_gtin(db, unique_gtin)

        assert result.gtin == unique_gtin
        assert result.total_quantity == 80
        assert len(result.locations) == 2

    def test_get_inventory_by_gtin_not_found_error(self, db):
        """Test getting inventory for non-existent GTIN returns InventoryNotFoundException."""
        with pytest.raises(InventoryNotFoundException) as exc_info:
            self.service.get_inventory_by_gtin(db, "9999999999999")

        assert exc_info.value.error_code == "INVENTORY_NOT_FOUND"
        assert "9999999999999" in str(exc_info.value)
        assert exc_info.value.details["resource_type"] == "Inventory"

    def test_get_inventory_by_gtin_invalid_gtin_validation_error(self, db):
        """Test getting inventory with invalid GTIN returns InventoryValidationException."""
        with pytest.raises(InventoryValidationException) as exc_info:
            self.service.get_inventory_by_gtin(db, "invalid_gtin")

        assert exc_info.value.error_code == "INVENTORY_VALIDATION_FAILED"
        assert "Invalid GTIN format" in str(exc_info.value)

    def test_get_total_inventory_success(
        self, db, test_inventory, test_marketplace_product
    ):
        """Test getting total inventory for a GTIN successfully."""
        result = self.service.get_total_inventory(db, test_inventory.gtin)

        assert result["gtin"] == test_inventory.gtin
        assert result["total_quantity"] == test_inventory.quantity
        assert result["product_title"] == test_marketplace_product.title
        assert result["locations_count"] == 1

    def test_get_total_inventory_invalid_gtin_validation_error(self, db):
        """Test getting total inventory with invalid GTIN returns InventoryValidationException."""
        with pytest.raises(InventoryValidationException) as exc_info:
            self.service.get_total_inventory(db, "invalid_gtin")

        assert exc_info.value.error_code == "INVENTORY_VALIDATION_FAILED"
        assert "Invalid GTIN format" in str(exc_info.value)

    def test_get_total_inventory_not_found_error(self, db):
        """Test getting total inventory for non-existent GTIN returns InventoryNotFoundException."""
        with pytest.raises(InventoryNotFoundException) as exc_info:
            self.service.get_total_inventory(db, "9999999999999")

        assert exc_info.value.error_code == "INVENTORY_NOT_FOUND"

    def test_get_all_inventory_no_filters_success(self, db, test_inventory):
        """Test getting all inventory without filters successfully."""
        result = self.service.get_all_inventory(db)

        assert len(result) >= 1
        assert any(inventory.gtin == test_inventory.gtin for inventory in result)

    def test_get_all_inventory_with_location_filter_success(self, db, test_inventory):
        """Test getting all inventory with location filter successfully."""
        result = self.service.get_all_inventory(db, location=test_inventory.location)

        assert len(result) >= 1
        # Check that all returned inventory match the filter (case insensitive)
        for inventory in result:
            assert test_inventory.location.upper() in inventory.location.upper()

    def test_get_all_inventory_with_gtin_filter_success(self, db, test_inventory):
        """Test getting all inventory with GTIN filter successfully."""
        result = self.service.get_all_inventory(db, gtin=test_inventory.gtin)

        assert len(result) >= 1
        assert all(inventory.gtin == test_inventory.gtin for inventory in result)

    def test_get_all_inventory_with_pagination_success(self, db):
        """Test getting all inventory with pagination successfully."""
        unique_prefix = str(uuid.uuid4())[:8]

        # Create multiple inventory entries with unique GTINs and locations
        for i in range(5):
            inventory = Inventory(
                gtin=f"1234567890{i:03d}",  # Creates valid 13-digit GTINs
                location=f"WAREHOUSE_{unique_prefix}_{i}",
                quantity=10,
            )
            db.add(inventory)
        db.commit()

        result = self.service.get_all_inventory(db, skip=2, limit=2)

        assert (
            len(result) <= 2
        )  # Should be at most 2, might be less if other records exist

    def test_update_inventory_success(self, db, test_inventory):
        """Test updating inventory quantity successfully."""
        inventory_update = InventoryUpdate(quantity=150)

        result = self.service.update_inventory(db, test_inventory.id, inventory_update)

        assert result.id == test_inventory.id
        assert result.quantity == 150

    def test_update_inventory_not_found_error(self, db):
        """Test updating non-existent inventory entry returns InventoryNotFoundException."""
        inventory_update = InventoryUpdate(quantity=150)

        with pytest.raises(InventoryNotFoundException) as exc_info:
            self.service.update_inventory(db, 99999, inventory_update)

        assert exc_info.value.error_code == "INVENTORY_NOT_FOUND"
        assert "99999" in str(exc_info.value)

    def test_update_inventory_invalid_quantity_error(self, db, test_inventory):
        """Test updating inventory with invalid quantity returns InvalidQuantityException."""
        inventory_update = InventoryUpdate(quantity=-10)

        with pytest.raises(InvalidQuantityException) as exc_info:
            self.service.update_inventory(db, test_inventory.id, inventory_update)

        assert exc_info.value.error_code == "INVALID_QUANTITY"
        assert "Quantity cannot be negative" in str(exc_info.value)

    def test_delete_inventory_success(self, db, test_inventory):
        """Test deleting inventory entry successfully."""
        inventory_id = test_inventory.id

        result = self.service.delete_inventory(db, inventory_id)

        assert result is True

        # Verify the inventory is actually deleted
        deleted_inventory = (
            db.query(Inventory).filter(Inventory.id == inventory_id).first()
        )
        assert deleted_inventory is None

    def test_delete_inventory_not_found_error(self, db):
        """Test deleting non-existent inventory entry returns InventoryNotFoundException."""
        with pytest.raises(InventoryNotFoundException) as exc_info:
            self.service.delete_inventory(db, 99999)

        assert exc_info.value.error_code == "INVENTORY_NOT_FOUND"
        assert "99999" in str(exc_info.value)

    def test_get_low_inventory_items_success(
        self, db, test_inventory, test_marketplace_product
    ):
        """Test getting low inventory items successfully."""
        # Set inventory to a low value
        test_inventory.quantity = 5
        db.commit()

        result = self.service.get_low_inventory_items(db, threshold=10)

        assert len(result) >= 1
        low_inventory_item = next(
            (item for item in result if item["gtin"] == test_inventory.gtin), None
        )
        assert low_inventory_item is not None
        assert low_inventory_item["current_quantity"] == 5
        assert low_inventory_item["location"] == test_inventory.location
        assert low_inventory_item["product_title"] == test_marketplace_product.title

    def test_get_low_inventory_items_invalid_threshold_error(self, db):
        """Test getting low inventory items with invalid threshold returns InvalidQuantityException."""
        with pytest.raises(InvalidQuantityException) as exc_info:
            self.service.get_low_inventory_items(db, threshold=-5)

        assert exc_info.value.error_code == "INVALID_QUANTITY"
        assert "Threshold must be non-negative" in str(exc_info.value)

    def test_get_inventory_summary_by_location_success(self, db, test_inventory):
        """Test getting inventory summary by location successfully."""
        result = self.service.get_inventory_summary_by_location(
            db, test_inventory.location
        )

        assert (
            result["location"] == test_inventory.location.upper()
        )  # Service normalizes to uppercase
        assert result["total_items"] >= 1
        assert result["total_quantity"] >= test_inventory.quantity
        assert result["unique_gtins"] >= 1

    def test_get_inventory_summary_by_location_empty_result(self, db):
        """Test getting inventory summary for location with no inventory."""
        unique_id = str(uuid.uuid4())[:8]
        result = self.service.get_inventory_summary_by_location(
            db, f"EMPTY_LOCATION_{unique_id}"
        )

        assert result["total_items"] == 0
        assert result["total_quantity"] == 0
        assert result["unique_gtins"] == 0

    def test_validate_quantity_edge_cases(self, db):
        """Test quantity validation with edge cases."""
        # Test zero quantity with allow_zero=True (should succeed)
        inventory_data = InventoryCreate(
            gtin="1234567890123", location="WAREHOUSE_A", quantity=0
        )
        result = self.service.set_inventory(db, inventory_data)
        assert result.quantity == 0

        # Test zero quantity with add_inventory (should fail - doesn't allow zero)
        inventory_data_add = InventoryAdd(
            gtin="1234567890123", location="WAREHOUSE_B", quantity=0
        )
        with pytest.raises(InvalidQuantityException):
            self.service.add_inventory(db, inventory_data_add)

    def test_exception_structure_consistency(self, db):
        """Test that all exceptions follow the consistent WizamartException structure."""
        # Test with a known error case
        with pytest.raises(InventoryNotFoundException) as exc_info:
            self.service.get_inventory_by_gtin(db, "9999999999999")

        exception = exc_info.value

        # Verify exception structure matches WizamartException.to_dict()
        assert hasattr(exception, "error_code")
        assert hasattr(exception, "message")
        assert hasattr(exception, "status_code")
        assert hasattr(exception, "details")

        assert isinstance(exception.error_code, str)
        assert isinstance(exception.message, str)
        assert isinstance(exception.status_code, int)
        assert isinstance(exception.details, dict)


@pytest.fixture
def test_product_with_inventory(db, test_inventory):
    """Create a test product that corresponds to the test inventory."""
    product = MarketplaceProduct(
        marketplace_product_id="MP_TEST_001",
        title="Inventory Test MarketplaceProduct",
        gtin=test_inventory.gtin,
        price="29.99",
        brand="TestBrand",
        marketplace="Letzshop",
    )
    db.add(product)
    db.commit()
    db.refresh(product)
    return product