"""add platform memberships

Revision ID: 20260428_add_platform_memberships
Revises: 20260428_add_phone_auth_identity
Create Date: 2026-04-28
"""

from __future__ import annotations

from alembic import op
import sqlalchemy as sa


revision = "20260428_add_platform_memberships"
down_revision = "20260428_add_phone_auth_identity"
branch_labels = None
depends_on = None


def _table_exists(bind, table_name: str) -> bool:
    return sa.inspect(bind).has_table(table_name)


def _index_exists(bind, table_name: str, index_name: str) -> bool:
    if not _table_exists(bind, table_name):
        return False
    return any(index["name"] == index_name for index in sa.inspect(bind).get_indexes(table_name))


def upgrade() -> None:
    bind = op.get_bind()
    if _table_exists(bind, "platform_memberships"):
        return

    op.create_table(
        "platform_memberships",
        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column("created_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
        sa.Column("user_id", sa.BigInteger(), sa.ForeignKey("users.id", ondelete="CASCADE"), nullable=False),
        sa.Column("role", sa.String(length=50), nullable=False),
        sa.Column("status", sa.String(length=32), nullable=False, server_default="active"),
        sa.UniqueConstraint("user_id", "role", name="uq_platform_memberships_user_role"),
    )
    op.create_index("ix_platform_memberships_user_id", "platform_memberships", ["user_id"], unique=False)
    op.create_index("ix_platform_memberships_status", "platform_memberships", ["status"], unique=False)


def downgrade() -> None:
    bind = op.get_bind()
    if not _table_exists(bind, "platform_memberships"):
        return
    if _index_exists(bind, "platform_memberships", "ix_platform_memberships_status"):
        op.drop_index("ix_platform_memberships_status", table_name="platform_memberships")
    if _index_exists(bind, "platform_memberships", "ix_platform_memberships_user_id"):
        op.drop_index("ix_platform_memberships_user_id", table_name="platform_memberships")
    op.drop_table("platform_memberships")