"""Board database model."""

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

from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text
from sqlalchemy.dialects.postgresql import JSONB
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_image import BoardImage
    from app.database.models.group import Group
    from app.database.models.share_link import ShareLink
    from app.database.models.user import User


class Board(Base):
    """
    Board model representing a reference board (canvas) containing images.

    A board is owned by a user and contains images arranged on an infinite canvas
    with a specific viewport state (zoom, pan, rotation).
    """

    __tablename__ = "boards"

    id: Mapped[UUID] = mapped_column(PGUUID(as_uuid=True), primary_key=True, default=uuid4)
    user_id: Mapped[UUID] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)

    viewport_state: Mapped[dict] = mapped_column(
        JSONB,
        nullable=False,
        default=lambda: {"x": 0, "y": 0, "zoom": 1.0, "rotation": 0},
    )

    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, nullable=False, default=datetime.utcnow, onupdate=datetime.utcnow
    )
    is_deleted: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)

    # Relationships
    user: Mapped["User"] = relationship("User", back_populates="boards")
    board_images: Mapped[list["BoardImage"]] = relationship(
        "BoardImage", back_populates="board", cascade="all, delete-orphan"
    )
    groups: Mapped[list["Group"]] = relationship("Group", back_populates="board", cascade="all, delete-orphan")
    share_links: Mapped[list["ShareLink"]] = relationship(
        "ShareLink", back_populates="board", cascade="all, delete-orphan"
    )

    def __repr__(self) -> str:
        """String representation of Board."""
        return f"<Board(id={self.id}, title='{self.title}', user_id={self.user_id})>"