"""Knowledge extraction models — tracks LLM extractions and review queue."""
from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import DateTime, Float, ForeignKey, Index, String, Text, func
from sqlalchemy.dialects.postgresql import JSONB
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base, TenantMixin


class KnowledgeExtraction(Base, TenantMixin):
    """Tracks a single knowledge extraction run from a source (wiki, dms, mail, comm)."""
    __tablename__ = "knowledge_extractions"
    __table_args__ = (
        Index("ix_knowledge_ext_tenant_status", "tenant_id", "status"),
        Index("ix_knowledge_ext_source", "tenant_id", "source_type", "source_id"),
    )
    id: Mapped[uuid.UUID] = mapped_column(PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    source_type: Mapped[str] = mapped_column(String(50), nullable=False)  # wiki_article, dms_file, mail, communication
    source_id: Mapped[uuid.UUID] = mapped_column(PGUUID(as_uuid=True), nullable=False)
    source_title: Mapped[str | None] = mapped_column(String(500), nullable=True)
    extracted_entities: Mapped[list] = mapped_column(JSONB, nullable=False, default=list)
    extracted_relationships: Mapped[list] = mapped_column(JSONB, nullable=False, default=list)
    confidence: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    status: Mapped[str] = mapped_column(String(30), nullable=False, default="pending")  # pending, approved, rejected, auto_created
    review_notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    llm_model: Mapped[str | None] = mapped_column(String(100), nullable=True)
    llm_cost_usd: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    created_by: Mapped[uuid.UUID | None] = mapped_column(PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    reviewed_by: Mapped[uuid.UUID | None] = mapped_column(PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    reviewed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now())