from sqlalchemy import Column, Integer, String, DateTime, Boolean, Text, JSON, Float, ForeignKey, UniqueConstraint
from sqlalchemy.orm import relationship
import datetime
from .base import Base


class IntentDB(Base):
    __tablename__ = "intents"
    id = Column(Integer, primary_key=True, index=True)
    deterministic_id = Column(
        String(64),
        unique=True,
        index=True,
        nullable=False)
    intent_type = Column(String(64), nullable=False)
    payload = Column(JSON, nullable=False)
    oss_payload = Column(JSON, nullable=True)
    environment = Column(String(32), nullable=True)
    created_at = Column(
        DateTime,
        default=datetime.datetime.utcnow,
        nullable=False)
    evaluated_at = Column(DateTime, nullable=True)
    risk_score = Column(String(32), nullable=True)
    outcomes = relationship(
        "OutcomeDB",
        back_populates="intent",
        cascade="all, delete-orphan")


class OutcomeDB(Base):
    __tablename__ = "intent_outcomes"
    id = Column(Integer, primary_key=True, index=True)
    intent_id = Column(
        Integer,
        ForeignKey(
            "intents.id",
            ondelete="CASCADE"),
        nullable=False)
    success = Column(Boolean, nullable=False)
    recorded_by = Column(String(128), nullable=True)
    notes = Column(Text, nullable=True)
    recorded_at = Column(
        DateTime,
        default=datetime.datetime.utcnow,
        nullable=False)
    idempotency_key = Column(String(128), unique=True, nullable=True)
    intent = relationship("IntentDB", back_populates="outcomes")

    __table_args__ = (
        UniqueConstraint("intent_id", name="uq_outcome_intentid"),
    )


# ---------------------------------------------------------------------------
# NEW: Persistence for the conjugate Bayesian state
# ---------------------------------------------------------------------------
class BetaStateDB(Base):
    """
    Stores the per‑category posterior parameters (α, β) of the BetaStore
    so that online learning survives API restarts.

    Only one row per ActionCategory is expected; the 'category' column is
    unique.  Updates are performed via merge / upsert.
    """
    __tablename__ = "beta_state"

    id = Column(Integer, primary_key=True, index=True)
    category = Column(String(32), unique=True, nullable=False, index=True)
    alpha = Column(Float, nullable=False)
    beta = Column(Float, nullable=False)
    updated_at = Column(
        DateTime,
        default=datetime.datetime.utcnow,
        onupdate=datetime.datetime.utcnow)