from __future__ import annotations

from dataclasses import dataclass
from datetime import datetime, timezone

from app.db.models import FileAsset, FileBlob, FileVersion


class FileStorageError(RuntimeError):
    pass


@dataclass(slots=True)
class UploadedStoredFile:
    asset: FileAsset
    version: FileVersion
    blob: FileBlob


@dataclass(slots=True)
class ResolvedPattern:
    pattern: str
    matches: list[FileAsset]


@dataclass(slots=True)
class FileConflictResolution:
    target_path: str
    action: str
    new_path: str | None = None


@dataclass(slots=True)
class RenamePlanItem:
    kind: str
    id: str
    old_path: str
    new_path: str


def utcnow() -> datetime:
    return datetime.now(timezone.utc)