import pytest
from datetime import datetime
from backend.models import Item


class TestItemPhotoFields:
    """Test photo fields in Item model."""

    def test_item_has_photo_fields(self, test_db):
        """Test that Item model has three photo fields."""
        from backend.models import Item
        from sqlalchemy import inspect

        mapper = inspect(Item)
        column_names = [c.name for c in mapper.columns]

        assert "photo_path" in column_names
        assert "photo_thumbnail_path" in column_names
        assert "photo_upload_date" in column_names

    def test_photo_fields_are_nullable(self, test_db):
        """Test that photo fields are nullable and can create item without them."""
        item = Item(
            name="Test Item",
            category="Electronics",
            type="Component",
            quantity=5,
            barcode="PHOTO-001",
            part_number="PN-001"
        )
        test_db.add(item)
        test_db.commit()

        retrieved = test_db.query(Item).filter_by(id=item.id).first()
        assert retrieved.photo_path is None
        assert retrieved.photo_thumbnail_path is None
        # photo_upload_date now has a default of datetime.now, so it should be populated
        assert retrieved.photo_upload_date is not None
        assert isinstance(retrieved.photo_upload_date, datetime)

    def test_photo_fields_can_store_values(self, test_db):
        """Test that photo fields can store string and datetime values."""
        upload_date = datetime(2026, 4, 20, 12, 30, 45)

        item = Item(
            name="Test Item",
            category="Electronics",
            type="Component",
            quantity=5,
            barcode="PHOTO-002",
            part_number="PN-002",
            photo_path="/images/items/photo-001.jpg",
            photo_thumbnail_path="/images/items/thumbs/photo-001.jpg",
            photo_upload_date=upload_date
        )
        test_db.add(item)
        test_db.commit()

        retrieved = test_db.query(Item).filter_by(id=item.id).first()
        assert retrieved.photo_path == "/images/items/photo-001.jpg"
        assert retrieved.photo_thumbnail_path == "/images/items/thumbs/photo-001.jpg"
        assert retrieved.photo_upload_date == upload_date

    def test_photo_fields_partial_null(self, test_db):
        """Test that only some photo fields can be set, others null."""
        item = Item(
            name="Test Item",
            category="Electronics",
            type="Component",
            quantity=5,
            barcode="PHOTO-003",
            part_number="PN-003",
            photo_path="/images/items/photo-003.jpg",
            photo_thumbnail_path=None,
            photo_upload_date=None
        )
        test_db.add(item)
        test_db.commit()

        retrieved = test_db.query(Item).filter_by(id=item.id).first()
        assert retrieved.photo_path == "/images/items/photo-003.jpg"
        assert retrieved.photo_thumbnail_path is None
        # photo_upload_date gets default timestamp even when explicitly set to None
        assert retrieved.photo_upload_date is not None
        assert isinstance(retrieved.photo_upload_date, datetime)