import uuid
from datetime import datetime

from sqlalchemy import DateTime, ForeignKey, String, Text, UniqueConstraint, Uuid, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


class Registration(Base):
    __tablename__ = "registrations"
    __table_args__ = (UniqueConstraint("championship_id", "user_id", name="uq_registration_champ_user"),)

    id: Mapped[uuid.UUID] = mapped_column(Uuid(as_uuid=True), primary_key=True, default=uuid.uuid4)
    championship_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True), ForeignKey("championships.id", ondelete="CASCADE"), nullable=False
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    category: Mapped[str | None] = mapped_column(String(255))
    level: Mapped[str | None] = mapped_column(String(100))
    notes: Mapped[str | None] = mapped_column(Text)

    # Multi-stage status:
    # 'submitted' → 'form_submitted' → 'payment_pending' → 'payment_confirmed' →
    # 'video_submitted' → 'accepted' | 'rejected' | 'waitlisted'
    status: Mapped[str] = mapped_column(String(30), nullable=False, default="submitted")
    video_url: Mapped[str | None] = mapped_column(String(2048))

    submitted_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    decided_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))

    championship: Mapped["Championship"] = relationship(back_populates="registrations")  # type: ignore[name-defined]
    user: Mapped["User"] = relationship(back_populates="registrations")  # type: ignore[name-defined]
    notification_logs: Mapped[list["NotificationLog"]] = relationship(back_populates="registration")  # type: ignore[name-defined]