import enum
import uuid
from datetime import datetime, timezone
from sqlalchemy import String, Integer, ForeignKey, DateTime, Enum, Boolean
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship

class Base(DeclarativeBase):
    pass

class TicketStatus(str, enum.Enum):
    AVAILABLE = "AVAILABLE"
    LOCKED = "LOCKED"
    PAID = "PAID"
    SCANNED = "SCANNED"
    REFUNDED = "REFUNDED"

class User(Base):
    __tablename__ = "users"
    id: Mapped[int] = mapped_column(primary_key=True)
    email: Mapped[str] = mapped_column(String, unique=True, index=True)
    hashed_password: Mapped[str] = mapped_column(String)
    is_superuser: Mapped[bool] = mapped_column(Boolean, default=False)
    tickets: Mapped[list["Ticket"]] = relationship(back_populates="user")

class Tournament(Base):
    __tablename__ = "tournaments"
    id: Mapped[int] = mapped_column(primary_key=True)
    title: Mapped[str] = mapped_column(String)
    description: Mapped[str | None] = mapped_column(String, nullable=True)
    event_date: Mapped[datetime] = mapped_column(DateTime(timezone=True))
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    seats: Mapped[list["Seat"]] = relationship(back_populates="tournament")

class Seat(Base):
    __tablename__ = "seats"
    id: Mapped[int] = mapped_column(primary_key=True)
    tournament_id: Mapped[int] = mapped_column(ForeignKey("tournaments.id"), index=True)
    sector: Mapped[str] = mapped_column(String)
    row: Mapped[int] = mapped_column(Integer)
    number: Mapped[int] = mapped_column(Integer)
    price: Mapped[int] = mapped_column(Integer)
    
    tournament: Mapped["Tournament"] = relationship(back_populates="seats")
    ticket: Mapped["Ticket"] = relationship(back_populates="seat", uselist=False)

class Ticket(Base):
    __tablename__ = "tickets"
    id: Mapped[int] = mapped_column(primary_key=True)
    seat_id: Mapped[int] = mapped_column(ForeignKey("seats.id"), unique=True, index=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=True, index=True)
    
    status: Mapped[TicketStatus] = mapped_column(
        Enum(TicketStatus, name="ticket_status_enum", create_type=False),
        default=TicketStatus.AVAILABLE,
        index=True
    )
    idempotency_key: Mapped[str] = mapped_column(String, unique=True, nullable=True)
    pdf_url: Mapped[str | None] = mapped_column(String, nullable=True)
    # nullable=True — безопасно для существующих строк; новые билеты получают UUID автоматически
    secret_token: Mapped[str | None] = mapped_column(
        String, unique=True, index=True, nullable=True,
        default=lambda: str(uuid.uuid4()),
    )
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), 
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc)
    )

    seat: Mapped["Seat"] = relationship(back_populates="ticket")
    user: Mapped["User"] = relationship(back_populates="tickets")