from datetime import datetime

from core_db import AuditMixin, Base, EntityMixin, VersionMixin
from core_shared import JSONValue
from sqlalchemy import DateTime, String, Text
from sqlalchemy.dialects.sqlite import JSON
from sqlalchemy.orm import Mapped, mapped_column


class KnowledgeDocument(EntityMixin, AuditMixin, VersionMixin, Base):
    __tablename__ = "knowledge_document"

    knowledge_base_id: Mapped[str] = mapped_column(String(36), index=True)
    title: Mapped[str] = mapped_column(String(256))
    source_type: Mapped[str] = mapped_column(String(32), default="text", index=True)
    source_uri: Mapped[str | None] = mapped_column(String(512), nullable=True)
    status: Mapped[str] = mapped_column(String(32), default="draft", index=True)
    content_text: Mapped[str] = mapped_column(Text)
    content_hash: Mapped[str | None] = mapped_column(String(64), nullable=True, index=True)
    metadata_json: Mapped[dict[str, JSONValue] | None] = mapped_column(JSON, nullable=True)
    indexed_time: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)