from __future__ import annotations

from datetime import datetime, timezone
from enum import Enum

from sqlalchemy import DateTime, Float, ForeignKey, String
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.extensions import db


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


class AttendanceType(str, Enum):
    CHECK_IN = "check_in"
    CHECK_OUT = "check_out"

    @property
    def label(self) -> str:
        return "Check in" if self is AttendanceType.CHECK_IN else "Check out"


class AttendanceEvent(db.Model):
    __tablename__ = "attendance_events"

    id: Mapped[int] = mapped_column(primary_key=True)
    person_id: Mapped[int] = mapped_column(ForeignKey("people.id"), nullable=False, index=True)
    event_type: Mapped[str] = mapped_column(String(20), nullable=False)
    occurred_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, nullable=False, index=True)
    source: Mapped[str] = mapped_column(String(80), default="web", nullable=False)
    confidence: Mapped[float | None] = mapped_column(Float)
    created_by_id: Mapped[int | None] = mapped_column(ForeignKey("accounts.id"), index=True)

    person = relationship("Person", back_populates="attendance_events")
    created_by = relationship("Account", back_populates="attendance_events")

    @property
    def type_label(self) -> str:
        try:
            return AttendanceType(self.event_type).label
        except ValueError:
            return self.event_type