"""Hand-written fakes for narrow application-owned ports (ADR-0016)."""

from dataclasses import dataclass, field


@dataclass
class FakeObjectStorage:
    """In-memory `ObjectStorage`. `fail_next` simulates one upload failure."""

    objects: dict[str, bytes] = field(default_factory=dict)
    fail_next: bool = False

    async def put_object(self, *, key: str, data: bytes, content_type: str) -> None:
        if self.fail_next:
            self.fail_next = False
            raise OSError("simulated object storage failure")
        self.objects[key] = data