// 只读核对工具。**修补本身已由迁移承担**：
// frontend/supabase/migrations/20260916020000_rectification_session_title_repair.sql
// 产品跑 Gitea → `Migrate Staging Database` 就会应用它，不需要 SSH 或库口令。
//
// 本文件保留下来有两个用处：
//   1. 排查时数一数还有多少行没对上（不写库，只 select count）；
//   2. 下面三段 SQL 是那条迁移的**唯一出处**，迁移逐字抄它们。
//      tests/rectification-session-title-repair-migration.test.ts 会比对两边，
//      改了这里而没同步迁移（或反过来）测试就红。
//
// 需要 SCHEMA_DATABASE_URL 才能连库；没有它的环境只能跑上面那个合同测试。

import { resolve } from "node:path";
import { pathToFileURL } from "node:url";

import pg from "pg";

const { Client } = pg;

export const TITLE_MATCH_SQL = `
session_type = 'birth_time_rectification'
and title ~ '^[0-9]{1,2}月[0-9]{1,2}日[[:space:]]*·[[:space:]]*生时校正([[:space:]]+[0-9]{2}:[0-9]{2})?$'
and (
  created_at is null
  or (substring(title from '^([0-9]{1,2})月'))::int
      is distinct from extract(month from created_at at time zone 'Asia/Shanghai')::int
  or (substring(title from '月([0-9]{1,2})日'))::int
      is distinct from extract(day from created_at at time zone 'Asia/Shanghai')::int
)
`;

const TITLE_COUNT_SQL = `select count(*)::int as n from public.chat_sessions where ${TITLE_MATCH_SQL}`;

export const TITLE_APPLY_SQL = `
update public.chat_sessions
set title = case
  when created_at is null then '生时校正'
  else to_char(created_at at time zone 'Asia/Shanghai', 'FMMM')
    || '月'
    || to_char(created_at at time zone 'Asia/Shanghai', 'FMDD')
    || '日 · 生时校正'
end
where ${TITLE_MATCH_SQL}
`;

const ACTIVITY_COUNT_SQL = `
select count(*)::int as n
from public.chat_sessions as session
join public.agentic_rectification_cases as case_row
  on case_row.session_id = session.id
  and case_row.user_id = session.user_id
left join lateral (
  select max(turn.created_at) as last_turn_at
  from public.agentic_rectification_turns as turn
  where turn.case_id = case_row.id
) as turns on true
where session.session_type = 'birth_time_rectification'
  and session.updated_at < coalesce(turns.last_turn_at, case_row.last_activity_at)
`;

export const ACTIVITY_APPLY_SQL = `
update public.chat_sessions as session
set updated_at = coalesce(turns.last_turn_at, case_row.last_activity_at)
from public.agentic_rectification_cases as case_row
left join lateral (
  select max(turn.created_at) as last_turn_at
  from public.agentic_rectification_turns as turn
  where turn.case_id = case_row.id
) as turns on true
where case_row.session_id = session.id
  and case_row.user_id = session.user_id
  and session.session_type = 'birth_time_rectification'
  and session.updated_at < coalesce(turns.last_turn_at, case_row.last_activity_at)
`;

function connectionString() {
  const value = process.env.SCHEMA_DATABASE_URL?.trim();
  if (!value) {
    throw new Error("SCHEMA_DATABASE_URL is required");
  }
  if (!/^postgres(ql)?:\/\//.test(value)) {
    throw new Error("SCHEMA_DATABASE_URL must be a PostgreSQL URL");
  }
  return value;
}

async function main() {
  if (process.argv.includes("--apply")) {
    throw new Error(
      "--apply has been removed; the repair now ships as migration " +
        "20260916020000_rectification_session_title_repair.sql. " +
        "Apply it with Gitea -> Migrate Staging Database.",
    );
  }
  const client = new Client({ connectionString: connectionString() });
  await client.connect();
  try {
    const titles = await client.query(TITLE_COUNT_SQL);
    const activity = await client.query(ACTIVITY_COUNT_SQL);
    console.log(`mismatched_dated_rectification_titles=${titles.rows[0]?.n ?? 0}`);
    console.log(`stale_rectification_updated_at=${activity.rows[0]?.n ?? 0}`);
  } finally {
    await client.end();
  }
}

// Only connect when run as a command. Importing this file (the contract test
// does) must not open a database connection.
const invokedPath = process.argv[1]
  ? pathToFileURL(resolve(process.argv[1])).href
  : undefined;

if (invokedPath === import.meta.url) {
  main().catch((error) => {
    console.error(error instanceof Error ? error.message : error);
    process.exitCode = 1;
  });
}