"""wechat_bot_bindings 表(ClawBot 个人微信绑定,DESIGN §8.7 渠道 A).

Revision ID: 0012
Revises: 0011
Create Date: 2026-06-24

新增独立表 wechat_bot_bindings —— 不碰现有 schema(公测兼容)。一行 = 一个用户绑定其
个人微信 ClawBot。bot_token / latest_context_token 存密文(core/wechat/crypto.py)。
入站长轮询管理器按 status='active' 拉绑定起 getupdates 循环;主动推送用 latest_context_token
(24h 内有效)。详 DESIGN §8.7 / core/storage/models.py。
"""
from typing import Sequence, Union

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


revision: str = "0012"
down_revision: Union[str, None] = "0011"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "wechat_bot_bindings",
        sa.Column(
            "user_id", PG_UUID(as_uuid=True),
            sa.ForeignKey("users.user_id", ondelete="CASCADE"), primary_key=True,
        ),
        sa.Column("bot_token", sa.Text(), nullable=False),
        sa.Column("bot_im_id", sa.Text(), nullable=True),
        sa.Column("user_im_id", sa.Text(), nullable=True),
        sa.Column(
            "base_url", sa.Text(), nullable=False,
            server_default="https://ilinkai.weixin.qq.com",
        ),
        sa.Column("latest_context_token", sa.Text(), nullable=True),
        sa.Column("context_token_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column(
            "chat_task_id", PG_UUID(as_uuid=True),
            sa.ForeignKey("tasks.task_id", ondelete="SET NULL"), nullable=True,
        ),
        sa.Column("status", sa.Text(), nullable=False, server_default="active"),
        sa.Column(
            "created_at", sa.DateTime(timezone=True),
            server_default=sa.func.now(), nullable=False,
        ),
        sa.Column(
            "updated_at", sa.DateTime(timezone=True),
            server_default=sa.func.now(), nullable=False,
        ),
    )
    # 入站管理器扫 active 绑定起长轮询
    op.create_index(
        "ix_wechat_bot_bindings_active", "wechat_bot_bindings", ["status"],
    )


def downgrade() -> None:
    op.drop_index("ix_wechat_bot_bindings_active", table_name="wechat_bot_bindings")
    op.drop_table("wechat_bot_bindings")