from __future__ import annotations

from sqlalchemy import Boolean, Float, ForeignKey, Integer, JSON, String, Text
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base import Base, TimestampMixin, UUIDPrimaryKeyMixin


class KnowledgeItem(UUIDPrimaryKeyMixin, TimestampMixin, Base):
    __tablename__ = "knowledge_items"

    mine_id: Mapped[str | None] = mapped_column(
        String(32), ForeignKey("mines.id", ondelete="SET NULL"), nullable=True, index=True
    )
    document_id: Mapped[str | None] = mapped_column(
        String(32), ForeignKey("business_documents.id", ondelete="SET NULL"), nullable=True
    )
    code: Mapped[str | None] = mapped_column(String(64), nullable=True, index=True)
    title: Mapped[str] = mapped_column(String(255), index=True)
    knowledge_type: Mapped[str] = mapped_column(String(32), index=True)
    category: Mapped[str] = mapped_column(String(64), default="", index=True)
    source_type: Mapped[str] = mapped_column(String(32), default="manual")
    source_ref: Mapped[str] = mapped_column(String(512), default="")
    content: Mapped[str] = mapped_column(Text)
    summary: Mapped[str] = mapped_column(Text, default="")
    tags: Mapped[list] = mapped_column(JSON, default=list)
    status: Mapped[str] = mapped_column(String(32), default="published", index=True)
    version: Mapped[str] = mapped_column(String(32), default="V1.0")
    confidence: Mapped[float | None] = mapped_column(Float, nullable=True)
    is_verified: Mapped[bool] = mapped_column(Boolean, default=False, index=True)
    verified_by: Mapped[str] = mapped_column(String(128), default="")
    metadata_json: Mapped[dict] = mapped_column("metadata", JSON, default=dict)


class KnowledgeChunk(UUIDPrimaryKeyMixin, TimestampMixin, Base):
    __tablename__ = "knowledge_chunks"

    knowledge_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("knowledge_items.id", ondelete="CASCADE"), index=True
    )
    chunk_index: Mapped[int] = mapped_column(Integer)
    title: Mapped[str] = mapped_column(String(255), default="")
    content: Mapped[str] = mapped_column(Text)
    token_count: Mapped[int] = mapped_column(Integer, default=0)
    vector_id: Mapped[str] = mapped_column(String(128), default="", index=True)
    embedding_model: Mapped[str] = mapped_column(String(128), default="")
    metadata_json: Mapped[dict] = mapped_column("metadata", JSON, default=dict)