from typing import TYPE_CHECKING

from sqlmodel import Field, Relationship, UniqueConstraint

from app.models.base import BaseModel

if TYPE_CHECKING:
    from app.models.playlist import Playlist
    from app.models.sound import Sound


class PlaylistSound(BaseModel, table=True):
    """Database model for a sound in a playlist."""

    __tablename__ = "playlist_sound"  # pyright: ignore[reportAssignmentType]

    playlist_id: int = Field(foreign_key="playlist.id", nullable=False)
    sound_id: int = Field(foreign_key="sound.id", nullable=False)
    position: int = Field(default=0, ge=0, nullable=False)

    # constraints
    __table_args__ = (
        UniqueConstraint(
            "playlist_id",
            "sound_id",
            name="uq_playlist_sound_playlist_sound",
        ),
        UniqueConstraint(
            "playlist_id",
            "position",
            name="uq_playlist_sound_playlist_position",
        ),
    )

    # relationships
    playlist: "Playlist" = Relationship(back_populates="playlist_sounds")
    sound: "Sound" = Relationship(back_populates="playlist_sounds")