from pydantic import BaseModel
from typing import Optional, List
from datetime import datetime


class AttachmentVersionResponse(BaseModel):
    id: str
    version: int
    file_size: int
    checksum: str
    uploaded_by: Optional[str] = None
    uploader_name: Optional[str] = None
    created_at: datetime

    class Config:
        from_attributes = True


class AttachmentResponse(BaseModel):
    id: str
    task_id: str
    filename: str
    original_filename: str
    mime_type: str
    file_size: int
    current_version: int
    is_encrypted: bool
    uploaded_by: Optional[str] = None
    uploader_name: Optional[str] = None
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


class AttachmentListResponse(BaseModel):
    attachments: List[AttachmentResponse]
    total: int


class AttachmentDetailResponse(AttachmentResponse):
    versions: List[AttachmentVersionResponse] = []


class VersionHistoryResponse(BaseModel):
    attachment_id: str
    filename: str
    versions: List[AttachmentVersionResponse]
    total: int