"""ShareLink database model."""

from datetime import datetime
from typing import TYPE_CHECKING
from uuid import UUID, uuid4

from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database.base import Base

if TYPE_CHECKING:
    from app.database.models.board import Board


class ShareLink(Base):
    """
    ShareLink model for sharing boards with configurable permissions.

    Share links allow users to share boards with others without requiring
    authentication, with permission levels controlling what actions are allowed.
    """

    __tablename__ = "share_links"

    id: Mapped[UUID] = mapped_column(PGUUID(as_uuid=True), primary_key=True, default=uuid4)
    board_id: Mapped[UUID] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("boards.id", ondelete="CASCADE"), nullable=False
    )
    token: Mapped[str] = mapped_column(String(64), unique=True, nullable=False, index=True)
    permission_level: Mapped[str] = mapped_column(String(20), nullable=False)  # 'view-only' or 'view-comment'

    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=datetime.utcnow)
    expires_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    last_accessed_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    access_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    is_revoked: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)

    # Relationships
    board: Mapped["Board"] = relationship("Board", back_populates="share_links")

    def __repr__(self) -> str:
        """String representation of ShareLink."""
        return f"<ShareLink(id={self.id}, token={self.token[:8]}..., board_id={self.board_id})>"