from __future__ import annotations

from datetime import datetime, timezone
from uuid import uuid4

from sqlalchemy import JSON, DateTime, Float, Integer, String, Text
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column


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


class Base(DeclarativeBase):
    pass


class AuditLog(Base):
    __tablename__ = "audit_logs"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid4())
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=_utcnow, index=True
    )
    method: Mapped[str] = mapped_column(String(12), index=True)
    path: Mapped[str] = mapped_column(String(300), index=True)
    query_string: Mapped[str] = mapped_column(String(1000), default="")
    status_code: Mapped[int] = mapped_column(Integer, index=True)
    duration_ms: Mapped[float] = mapped_column(Float)
    trace_id: Mapped[str | None] = mapped_column(String(32), nullable=True, index=True)
    span_id: Mapped[str | None] = mapped_column(String(16), nullable=True, index=True)
    client_ip: Mapped[str | None] = mapped_column(String(120), nullable=True)
    user_agent: Mapped[str | None] = mapped_column(Text, nullable=True)
    details: Mapped[dict] = mapped_column(JSON, default=dict)


class ForecastRun(Base):
    __tablename__ = "forecast_runs"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid4())
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=_utcnow, index=True
    )
    horizon_days: Mapped[int] = mapped_column(Integer)
    point_count: Mapped[int] = mapped_column(Integer)
    trigger_source: Mapped[str] = mapped_column(String(64), index=True)
    trace_id: Mapped[str | None] = mapped_column(String(32), nullable=True, index=True)
    span_id: Mapped[str | None] = mapped_column(String(16), nullable=True, index=True)
    payload: Mapped[list[dict]] = mapped_column(JSON, default=list)


class RankingRun(Base):
    __tablename__ = "ranking_runs"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid4())
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=_utcnow, index=True
    )
    top_n: Mapped[int] = mapped_column(Integer)
    item_count: Mapped[int] = mapped_column(Integer)
    trigger_source: Mapped[str] = mapped_column(String(64), index=True)
    trace_id: Mapped[str | None] = mapped_column(String(32), nullable=True, index=True)
    span_id: Mapped[str | None] = mapped_column(String(16), nullable=True, index=True)
    payload: Mapped[list[dict]] = mapped_column(JSON, default=list)


class RecommendationRun(Base):
    __tablename__ = "recommendation_runs"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid4())
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=_utcnow, index=True
    )
    item_count: Mapped[int] = mapped_column(Integer)
    trigger_source: Mapped[str] = mapped_column(String(64), index=True)
    trace_id: Mapped[str | None] = mapped_column(String(32), nullable=True, index=True)
    span_id: Mapped[str | None] = mapped_column(String(16), nullable=True, index=True)
    payload: Mapped[list[dict]] = mapped_column(JSON, default=list)