import { expect, test } from "@playwright/test";
import { mockAgentApi } from "./support/mock-agent-api";
import { mockWorkbenchContext } from "./support/mock-workbench-context";

type SyncProbe = {
  available: boolean;
  connections: number;
  cursors: string[];
  warnings: number;
  disconnect: (scheduled: boolean) => void;
};

declare global {
  interface Window { syncProbe: SyncProbe }
}

test("scheduled renewals stay silent while a sustained outage warns and recovers", async ({ page }) => {
  await mockWorkbenchContext(page);
  await mockAgentApi(page);
  await page.route("**/api/v1/workbench/sync-snapshot", (route) => route.fulfill({ json: {
    schema: "workbench-sync-snapshot@1", event_cursor: 41, generated_at: "2026-10-12T02:00:00Z",
    runtime: { availability: "not_configured", source: "none", scenario_availability: "not_configured",
      artifact_availability: "not_configured", schedule_availability: "not_configured",
      work_order_availability: "not_configured", alert_availability: "not_configured",
      generated_at: "2026-10-12T02:00:00Z", conditions: [], alerts: [], scenarios: [],
      latest_analysis: null, work_orders: [] }, tasks: [], notifications: []
  } }));
  await page.addInitScript(() => {
    const originalFetch = window.fetch.bind(window);
    let stream: ReadableStreamDefaultController<Uint8Array> | undefined;
    window.syncProbe = {
      available: true, connections: 0, cursors: [], warnings: 0,
      disconnect: (scheduled) => {
        if (!stream) throw new Error("No active event stream");
        if (scheduled) {
          stream.enqueue(new TextEncoder().encode("event: reconnect\ndata: {}\n\n"));
          stream.close();
        } else {
          stream.error(new Error("Synthetic connection loss"));
        }
        stream = undefined;
      }
    };
    new MutationObserver(() => {
      if (document.body?.textContent?.includes("业务同步正在重连")) window.syncProbe.warnings += 1;
    }).observe(document, { subtree: true, childList: true, characterData: true });
    window.fetch = async (input, init) => {
      const url = typeof input === "string" ? input : input instanceof URL ? input.href : input.url;
      if (!url.includes("/api/v1/workbench/events")) return originalFetch(input, init);
      window.syncProbe.cursors.push(new Headers(init?.headers).get("Last-Event-ID") ?? "");
      if (!window.syncProbe.available) return new Response("{}", { status: 503 });
      window.syncProbe.connections += 1;
      const body = new ReadableStream<Uint8Array>({
        start(controller) { stream = controller; },
        cancel() { stream = undefined; }
      });
      return new Response(body, { headers: { "Content-Type": "text/event-stream" } });
    };
  });
  const now = new Date("2026-10-12T02:00:00Z");
  await page.clock.install({ time: now });
  await page.clock.pauseAt(now);
  await page.goto("/", { waitUntil: "domcontentloaded" });
  await expect.poll(() => page.evaluate(() => window.syncProbe.connections), { timeout: 15_000 }).toBe(1);

  for (let cycle = 0; cycle < 3; cycle += 1) {
    await page.evaluate(() => window.syncProbe.disconnect(true));
    await page.clock.runFor(1_100);
    await expect.poll(() => page.evaluate(() => window.syncProbe.connections)).toBe(cycle + 2);
    expect(await page.evaluate(() => window.syncProbe.warnings)).toBe(0);
  }

  await page.evaluate(() => {
    window.syncProbe.available = false;
    window.syncProbe.disconnect(false);
  });
  await page.clock.runFor(14_000);
  await expect(page.getByText("业务同步正在重连", { exact: true })).toHaveCount(0);
  await page.clock.runFor(1_100);
  await expect(page.getByText("业务同步正在重连", { exact: true })).toBeVisible();
  await page.clock.runFor(500);
  expect(await page.evaluate(() => window.syncProbe.warnings)).toBeGreaterThan(0);
  const notice = page.getByText("业务同步正在重连", { exact: true });
  await expect(notice.locator("xpath=ancestor::li[@data-sonner-toast]")).toHaveCSS("opacity", "1");
  await expect(notice).toBeInViewport();
  await page.screenshot({ path: test.info().outputPath("sustained-outage.png") });

  await page.evaluate(() => { window.syncProbe.available = true; });
  await page.clock.runFor(16_000);
  await expect.poll(() => page.evaluate(() => window.syncProbe.connections)).toBe(5);
  await page.clock.runFor(500);
  await expect(page.getByText("业务同步正在重连", { exact: true })).toHaveCount(0);
  expect(await page.evaluate(() => window.syncProbe.cursors.every((cursor) => cursor === "41"))).toBe(true);
  await page.screenshot({ path: test.info().outputPath("recovered.png") });
});