from datetime import UTC, datetime

from app import db


class Checklist(db.Model):
    """Checklist model for Kanban checklists"""

    __tablename__ = "checklists"

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(200), nullable=False)
    pos = db.Column(db.Float)  # position for sorting

    # Foreign keys
    board_id = db.Column(
        db.Integer,
        db.ForeignKey("boards.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    card_id = db.Column(
        db.Integer,
        db.ForeignKey("cards.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )

    # Timestamps
    created_at = db.Column(db.DateTime, default=lambda: datetime.now(UTC))
    updated_at = db.Column(
        db.DateTime,
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    # Relationships
    check_items = db.relationship(
        "CheckItem", backref="checklist", cascade="all, delete-orphan", lazy="dynamic"
    )

    def to_dict(self):
        """Convert checklist to dictionary"""
        return {
            "id": self.id,
            "name": self.name,
            "pos": self.pos,
            "board_id": self.board_id,
            "card_id": self.card_id,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
        }

    def __repr__(self):
        return f"<Checklist {self.name}>"