from datetime import datetime
from typing import Optional

from pydantic import BaseModel, ConfigDict, Field

from app.models.enums import DocumentStatus
from app.utils.time import utc_now


class Document(BaseModel):
    """
    Represents a textbook uploaded to the knowledge base.
    """

    model_config = ConfigDict(
        populate_by_name=True,
        validate_assignment=True,
    )

    document_id: str

    filename: str
    original_filename: str
    file_path: str

    title: str

    subject: str
    standard: int

    language: str = "en"

    total_pages: int = 0
    total_chunks: int = 0

    status: DocumentStatus = DocumentStatus.PENDING

    embedding_model: str
    collection_name: str

    uploaded_by: Optional[str] = None


    created_at: datetime = Field(default_factory=utc_now)
    updated_at: datetime = Field(default_factory=utc_now)