"""add groups and group_members tables

Revision ID: 0003_add_groups_and_members
Revises: 0002_add_date_of_birth_to_users
Create Date: 2025-01-01 00:00:00.000000

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql

# revision identifiers, used by Alembic.
revision: str = "0003_add_groups_and_members"
down_revision: Union[str, None] = "0002_add_date_of_birth_to_users"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    """Create groups and group_members tables."""
    # Create group_member_role ENUM type
    group_member_role = postgresql.ENUM(
        "owner", "admin", "member", name="group_member_role"
    )
    group_member_role.create(op.get_bind(), checkfirst=True)

    # Create groups table
    op.create_table(
        "groups",
        sa.Column("id", sa.Integer(), primary_key=True, index=True),
        sa.Column("name", sa.String(length=255), nullable=False),
        sa.Column("description", sa.Text(), nullable=True),
        sa.Column(
            "owner_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), onupdate=sa.func.now()),
    )

    # Create group_members table
    op.create_table(
        "group_members",
        sa.Column(
            "group_id",
            sa.Integer(),
            sa.ForeignKey("groups.id", ondelete="CASCADE"),
            primary_key=True,
        ),
        sa.Column(
            "user_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            primary_key=True,
        ),
        sa.Column(
            "role",
            postgresql.ENUM(
                "owner", "admin", "member", name="group_member_role", create_type=False
            ),
            nullable=False,
            default="member",
        ),
        sa.Column("joined_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
    )


def downgrade() -> None:
    """Drop group_members and groups tables."""
    op.drop_table("group_members")
    op.drop_table("groups")

    # Drop group_member_role ENUM type
    postgresql.ENUM(name="group_member_role").drop(op.get_bind(), checkfirst=True)