from __future__ import annotations

from datetime import datetime

from sqlalchemy import DateTime, ForeignKey, Index, String, text
from sqlalchemy.orm import Mapped, mapped_column

from app.models.base import Base, TimestampMixin


class TeamManagerHistory(Base, TimestampMixin):
    __tablename__ = "team_manager_history"
    __table_args__ = (
        Index("ix_team_manager_history_team_time", "team_id", "started_at", "ended_at"),
        Index("ix_team_manager_history_manager_time", "manager_user_id", "started_at", "ended_at"),
        Index(
            "uq_team_manager_history_current",
            "team_id",
            unique=True,
            postgresql_where=text("ended_at IS NULL"),
        ),
    )

    id: Mapped[str] = mapped_column(String(32), primary_key=True)
    team_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("teams.id", ondelete="RESTRICT"), nullable=False
    )
    manager_user_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("users.id", ondelete="RESTRICT"), nullable=False
    )
    started_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    ended_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)