from typing import TYPE_CHECKING

from sqlalchemy import ForeignKey, Column, Table, UniqueConstraint, Index
from sqlalchemy.orm import mapped_column, Mapped, relationship

from models import BaseModel

if TYPE_CHECKING:
    from models import Project, Card


cards_card_tags = Table(
    'cards_card_tags',
    BaseModel.metadata,
    Column('card_id', ForeignKey('cards.id'), primary_key=True),
    Column('card_tag_id', ForeignKey('card_tags.id'), primary_key=True),
)


class CardTag(BaseModel):
    __tablename__ = 'card_tags'

    id: Mapped[int] = mapped_column(primary_key=True)
    name: Mapped[str] = mapped_column(nullable=False)
    is_deleted: Mapped[bool] = mapped_column(default=False, server_default='0')

    project_id: Mapped[int] = mapped_column(
        ForeignKey('projects.id'),
        nullable=False,
    )
    project: Mapped['Project'] = relationship(
        'Project',
        back_populates='tags',
        lazy='noload',
    )

    cards: Mapped[list['Card']] = relationship(
        secondary='cards_card_tags',
        lazy='noload',
        back_populates='tags',
    )

    __table_args__ = (
        Index('idx_card_name_project_id', 'name', 'project_id', 'is_deleted'),
    )