import assert from "node:assert/strict";
import { readFile } from "node:fs/promises";
import test from "node:test";

// claimed_quantity 口径：领取(+1)/释放(-1) 维护的不变式是
// claimed_quantity == 当前分发行数。种子与 0020 迁移都可能造成漂移，
// 这里钉住三道防线：种子末尾对账、0021 生产对账、UI 一律读实时 dist_total。

test("seed reconciles claimed_quantity with actual distribution rows", async () => {
  const source = await readFile(
    new URL("../lib/mvp-db.ts", import.meta.url),
    "utf8",
  );
  const reconcile = source.indexOf(
    "SET claimed_quantity = (\n           SELECT COUNT(*) FROM distributions d WHERE d.task_id = tasks.id",
  );
  assert.ok(reconcile > 0, "种子阶段缺少 claimed_quantity 对账 UPDATE");
  const lastDistributionInsert = source.lastIndexOf(
    "INSERT INTO distributions",
  );
  assert.ok(
    reconcile > lastDistributionInsert,
    "对账必须发生在所有分发 INSERT 之后",
  );
  const batchEnd = source.indexOf("await db.batch(batch);", reconcile);
  assert.ok(batchEnd > reconcile, "对账语句必须在 seedIfEmpty 的 batch 内执行");
});

test("migration 0021 recalculates drifted claimed_quantity in production", async () => {
  const migration = await readFile(
    new URL("../mysql/0021_reconcile_claimed_quantity.sql", import.meta.url),
    "utf8",
  );
  assert.match(migration, /UPDATE tasks\s+SET claimed_quantity = \(\s+SELECT COUNT\(\*\) FROM distributions d\s+WHERE d\.task_id = tasks\.id\s+\)/);
  assert.match(migration, /WHERE claimed_quantity <> \(/);
});

test("admin surfaces read the live distribution count, not the counter", async () => {
  const [adminApp, projectService] = await Promise.all([
    readFile(new URL("../app/admin-app.tsx", import.meta.url), "utf8"),
    readFile(new URL("../lib/project-service.ts", import.meta.url), "utf8"),
  ]);

  // 任务卡双面板 + 概览统计
  assert.match(adminApp, /panelMetric\(task\.dist_total \?\? 0, task\.quantity, "已领取"/);
  assert.match(adminApp, /panelMetric\(task\.dist_submitted \?\? 0, task\.dist_total \?\? 0, "已收取"/);
  assert.match(adminApp, /sum \+ \(task\.dist_total \?\? 0\)/);
  // 项目树明细同样用实时口径
  assert.match(projectService, /AS dist_total/);
  assert.match(adminApp, /\{task\.dist_total\} \/ \{task\.quantity\}/);
  // 展示层不再读反规范化计数器
  assert.doesNotMatch(adminApp, /task\.claimed_quantity/);
});