"""add wechat identity fields

Revision ID: 20260507_add_wechat_identity
Revises: 20260501_add_reading_corner
Create Date: 2026-05-07 10:00:00
"""

from __future__ import annotations

from alembic import op
import sqlalchemy as sa


revision = "20260507_add_wechat_identity"
down_revision = "20260501_add_reading_corner"
branch_labels = None
depends_on = None


def _has_column(inspector: sa.Inspector, table_name: str, column_name: str) -> bool:
    return column_name in {column["name"] for column in inspector.get_columns(table_name)}


def upgrade() -> None:
    bind = op.get_bind()
    inspector = sa.inspect(bind)
    tables = set(inspector.get_table_names())
    if "users" not in tables:
        return

    if not _has_column(inspector, "users", "wechat_openid"):
        op.add_column("users", sa.Column("wechat_openid", sa.String(length=128), nullable=True))
    if not _has_column(inspector, "users", "wechat_unionid"):
        op.add_column("users", sa.Column("wechat_unionid", sa.String(length=128), nullable=True))
    if not _has_column(inspector, "users", "phone_verified_at"):
        op.add_column("users", sa.Column("phone_verified_at", sa.DateTime(), nullable=True))

    inspector = sa.inspect(bind)
    indexes = {index["name"] for index in inspector.get_indexes("users")}
    if "ix_users_wechat_openid" not in indexes:
        op.create_index("ix_users_wechat_openid", "users", ["wechat_openid"], unique=True)


def downgrade() -> None:
    bind = op.get_bind()
    inspector = sa.inspect(bind)
    tables = set(inspector.get_table_names())
    if "users" not in tables:
        return

    indexes = {index["name"] for index in inspector.get_indexes("users")}
    if "ix_users_wechat_openid" in indexes:
        op.drop_index("ix_users_wechat_openid", table_name="users")

    inspector = sa.inspect(bind)
    if _has_column(inspector, "users", "phone_verified_at"):
        op.drop_column("users", "phone_verified_at")
    inspector = sa.inspect(bind)
    if _has_column(inspector, "users", "wechat_unionid"):
        op.drop_column("users", "wechat_unionid")
    inspector = sa.inspect(bind)
    if _has_column(inspector, "users", "wechat_openid"):
        op.drop_column("users", "wechat_openid")