from sqlalchemy.dialects.mysql import BIGINT, SMALLINT
from sqlmodel import Column, Field, ForeignKey, Relationship, Session, SQLModel, UniqueConstraint, create_engine


class Guild(SQLModel, table=True):
    """
    Represents a Guild entity in the database.

    Attributes:
        id (int): The unique identifier for the guild.
        name (str): The name of the guild.
        submission_channel (int): The ID of the submission channel associated with the guild.
        verification_channel (int): The ID of the verification channel associated with the guild.
        active (bool): Indicates whether the guild is active. Defaults to True.
        category_groups (list[CategoryGroup]): A list of category groups associated with the guild.
    """

    __tablename__: str = "Guilds"

    id: int = Field(sa_column=Column(BIGINT(unsigned=True), primary_key=True))
    name: str = Field(max_length=95)
    submission_channel: int = Field(sa_column=Column(BIGINT(unsigned=True)))
    verification_channel: int = Field(sa_column=Column(BIGINT(unsigned=True)))
    active: bool = Field(default=True)

    category_groups: list["CategoryGroup"] = Relationship(back_populates="guild", cascade_delete=True)


class CategoryGroup(SQLModel, table=True):
    """
    Represents a category group in the database.

    Attributes:
        id (int | None): The primary key of the category group.
        name (str): The name of the category group, with a maximum length of 50 characters.
        channel_id (int): The ID of the channel associated with the category group.
        guild_id (int): The ID of the guild associated with the category group.
        message_id (int): The ID of the message associated with the category group.
        pad_length (int): The padding length for the category group, default is 12.
        username_length (int): The username length for the category group, default is 12.
        guild (Guild | None): The guild relationship back-populated from the Guild model.
    """

    __tablename__: str = "CategoryGroups"

    id: int | None = Field(default=None, primary_key=True)
    name: str = Field(max_length=50)
    channel_id: int = Field(sa_column=Column(BIGINT(unsigned=True)))
    guild_id: int = Field(sa_column=Column(BIGINT(unsigned=True), ForeignKey("Guilds.id", ondelete="CASCADE")))
    message_id: int = Field(sa_column=Column(BIGINT(unsigned=True)))
    pad_length: int = Field(default=12, sa_column=Column(SMALLINT(unsigned=True)))
    username_length: int = Field(default=12, sa_column=Column(SMALLINT(unsigned=True)))

    __table_args__ = (UniqueConstraint("guild_id", "name", name="UniqueGuildCategoryGroup"),)

    guild: Guild | None = Relationship(back_populates="category_groups")


url = "sqlite:///database.db"
engine = create_engine(url)
SQLModel.metadata.create_all(engine)

with Session(engine) as session:
    guild = Guild(id=1, name="test guild", submission_channel=1, verification_channel=2)
    session.add(guild)

    group1 = CategoryGroup(name="group1", channel_id=1, guild_id=1, message_id=1)
    group2 = CategoryGroup(name="group1", channel_id=2, guild_id=1, message_id=2)
    session.add(group1)
    session.add(group2)

    session.commit()