from datetime import datetime
from typing import Optional

from pydantic import BaseModel, Field


# ---------- 请求 ----------

class CreateDocumentRequest(BaseModel):
    user_id: str = Field(..., alias="userId")
    file_url: str = Field(..., alias="fileUrl")
    session_id: str = Field(..., alias="sessionId")

    model_config = {"populate_by_name": True}


# ---------- 响应 ----------

class DocumentResponse(BaseModel):
    id: str
    content_db_path: str = Field(..., serialization_alias="contentDbPath")
    session_id: str = Field(..., serialization_alias="sessionId")
    user_id: Optional[str] = Field(None, serialization_alias="userId")
    created_at: datetime = Field(..., serialization_alias="createdAt")
    updated_at: datetime = Field(..., serialization_alias="updatedAt")
    blocks: list = []  # 可选，用于返回 blocks

    model_config = {"from_attributes": True, "populate_by_name": True}


class DocumentListItem(BaseModel):
    id: str
    session_id: str = Field(..., serialization_alias="sessionId")
    created_at: datetime = Field(..., serialization_alias="createdAt")
    updated_at: datetime = Field(..., serialization_alias="updatedAt")

    model_config = {"from_attributes": True, "populate_by_name": True}


class Pagination(BaseModel):
    page: int
    page_size: int = Field(..., serialization_alias="pageSize")
    total: int
    total_pages: int = Field(..., serialization_alias="totalPages")

    model_config = {"populate_by_name": True}