from datetime import datetime, timezone

from sqlalchemy import Float, ForeignKey, Integer, String, Text
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship


class Base(DeclarativeBase):
    pass


def _utc_now() -> datetime:
    return datetime.now(timezone.utc)


class Analysis(Base):
    __tablename__ = "analyses"

    id: Mapped[str] = mapped_column(String(36), primary_key=True)
    device_id: Mapped[str] = mapped_column(String(36), index=True)
    created_at: Mapped[datetime] = mapped_column(default=_utc_now, index=True)
    source: Mapped[str] = mapped_column(String(20))
    language: Mapped[str] = mapped_column(String(10))
    risk_score: Mapped[float] = mapped_column(Float)
    risk_level: Mapped[str] = mapped_column(String(10))
    duration_ms: Mapped[int] = mapped_column(Integer, default=0)
    transcript_preview: Mapped[str | None] = mapped_column(Text, nullable=True)
    text_hash: Mapped[str | None] = mapped_column(String(64), nullable=True)

    features: Mapped[list["Feature"]] = relationship(
        back_populates="analysis", cascade="all, delete-orphan"
    )


class Feature(Base):
    __tablename__ = "features"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    analysis_id: Mapped[str] = mapped_column(
        ForeignKey("analyses.id", ondelete="CASCADE"), index=True
    )
    type: Mapped[str] = mapped_column(String(30))
    weight: Mapped[float] = mapped_column(Float)
    evidence: Mapped[str] = mapped_column(Text)

    analysis: Mapped[Analysis] = relationship(back_populates="features")


class Feedback(Base):
    __tablename__ = "feedback"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    analysis_id: Mapped[str] = mapped_column(
        ForeignKey("analyses.id", ondelete="CASCADE"), index=True
    )
    device_id: Mapped[str] = mapped_column(String(36), index=True)
    correct: Mapped[int] = mapped_column(Integer)
    comment: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(default=_utc_now)