import type { Page } from '@playwright/test';
import { expect, test } from '@playwright/test';

// v0.30.0 — ISS-057: when a landing leaves any plane on the ground the sim slows to 1× server-side
// WITHOUT pausing (pause is manual-only now), and starting a flight (POST /api/planes/{id}/fly)
// restores the last MANUALLY selected speed once no plane remains grounded. The cycle: dispatch at
// 1000× → landing slows to 1× → next dispatch (last grounded plane airborne) resumes 1000×.

const SCALE = 1000; // fastest sim speed — top of the v0.14.0 ladder (same convention as e2e/sim.spec.ts)
const HUB = 'EDDF'; // Frankfurt Main — the seeded starter plane's home base (lib/game/seed.ts)

interface SimState {
  clockMs: number;
  timeScale: number;
  paused: boolean;
}

interface StateBody {
  simState: SimState;
  planes: Array<{ id: string; status: string; locationIcao: string; destIcao: string | null }>;
}

async function getState(page: Page): Promise<StateBody> {
  const res = await page.request.get('/api/state');
  expect(res.ok()).toBeTruthy();
  return (await res.json()) as StateBody;
}

async function postSim(page: Page, body: Record<string, unknown>): Promise<void> {
  const res = await page.request.post('/api/sim', { data: body });
  expect(res.status()).toBe(200);
}

// Set the time scale and VERIFY from the response that it stuck — if something external ever
// resets the live instance's controls mid-test, fail loudly here instead of timing out later.
// ISS-057 also records this as lastSelectedTimeScale (the resume target) and clears pause, so any
// fast-forward after a manual pause or a slowed-to-1× landing proceeds at full speed.
async function setScale(page: Page, scale: number): Promise<void> {
  const res = await page.request.post('/api/sim', { data: { timeScale: scale, paused: false } });
  expect(res.status()).toBe(200);
  const body = (await res.json()) as SimState;
  expect(body.timeScale, `timeScale should be ${scale} after POST /api/sim`).toBe(scale);
}

// Closest airport to the hub from /api/airports → shortest possible leg (fastest e2e flight).
async function nearestToHub(page: Page): Promise<{ icao: string }> {
  const res = await page.request.get('/api/airports');
  expect(res.ok()).toBeTruthy();
  const fc = (await res.json()) as { features: Array<{ properties: { icao: string; lat: number; lon: number } }> };
  const hub = fc.features.find((f) => f.properties.icao === HUB)!.properties;
  let nearest = fc.features.filter((f) => f.properties.icao !== HUB)[0].properties;
  for (const f of fc.features) {
    if (f.properties.icao === HUB) continue;
    const d = Math.hypot(f.properties.lat - hub.lat, f.properties.lon - hub.lon);
    const dn = Math.hypot(nearest.lat - hub.lat, nearest.lon - hub.lon);
    if (d < dn) nearest = f.properties;
  }
  return { icao: nearest.icao };
}

// Self-heal helper (same pattern as e2e/relocation.spec.ts): let any in-flight leg finish and
// reposition plane-starter home via the API so every test starts from the canonical state even
// after an interrupted previous run.
async function flyHomeViaApi(page: Page): Promise<void> {
  let s = await getState(page);
  let plane = s.planes.find((p) => p.id === 'plane-starter')!;
  if (plane.status === 'flying' || plane.locationIcao !== HUB) {
    // Fast-forward any leftover leg / repositioning flight (~20 s real time worst case at 1000×).
    await setScale(page, SCALE);
  }
  if (plane.status === 'flying') {
    // Let the in-flight leg finish before repositioning. While flying, locationIcao stays at the
    // DEPARTURE airport — re-read state after landing before deciding whether a repositioning
    // flight is needed.
    await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.status), { timeout: 240_000 }).toBe('available');
    s = await getState(page);
    plane = s.planes.find((p) => p.id === 'plane-starter')!;
  }
  if (plane.locationIcao !== HUB) {
    // ISS-057: the landing above slowed the sim to 1× — setScale restores 1000× (and records it as
    // lastSelectedTimeScale) so the return leg fast-forwards instead of taking real-time hours.
    await setScale(page, SCALE);
    // ISS-082: dispatch auto-refuels, so a grounded plane can always start any full-tank-flyable
    // leg when cash allows — no top-up retry needed.
    const flyHome = await page.request.post(`/api/planes/${plane.id}/fly`, { data: { destIcao: HUB } });
    expect(flyHome.ok()).toBeTruthy(); // repositioning needs no package (v0.12.0 manual flight)
    await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.locationIcao), { timeout: 240_000 }).toBe(HUB);
  }
}

// Self-heal in CLEANUP (afterEach): the test deliberately leaves plane-starter at the far end, so
// fast-forward + reposition home here; then restore scale=1 / unpaused for later specs.
test.afterEach(async ({ page }) => {
  await flyHomeViaApi(page);
  await postSim(page, { timeScale: 1, paused: false });
});

test.describe.configure({ mode: 'serial' }); // shared live DB — order matters within this file

test('landing slows the sim to 1× without pausing; dispatch restores the last selected speed (ISS-057)', async ({ page }) => {
  test.setTimeout(300_000); // self-heal (worst case ~20 s at 1000×) + two short legs
  await flyHomeViaApi(page); // deterministic: the starter sits grounded at EDDF

  const nearest = await nearestToHub(page);

  // Set 1000× via the API and verify it stuck (also records lastSelectedTimeScale=1000).
  await setScale(page, SCALE);

  // Dispatch plane-starter on the shortest leg from its hub (repositioning — no package needed).
  const flyRes = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: nearest.icao } });
  expect(flyRes.status()).toBe(200);

  // Wait for the landing…
  let landedBody: StateBody | undefined;
  await expect
    .poll(async () => {
      const b = await getState(page);
      const p = b.planes.find((x) => x.id === 'plane-starter')!;
      if (p.status === 'available' && p.locationIcao === nearest.icao) landedBody = b;
      return !!landedBody;
    }, { timeout: 120_000, message: `waiting for plane-starter to land at ${nearest.icao}` })
    .toBe(true);

  // …and the server slowed the sim to 1× WITHOUT pausing — persisted on sim_state, so this very
  // snapshot shows it (the just-landed plane is on ground → slow; ISS-057).
  expect(landedBody!.simState.paused).toBe(false);
  expect(landedBody!.simState.timeScale).toBe(1);

  // A subsequent /fly dispatch restores the last selected speed — asserted on the endpoint's OWN
  // full post-action snapshot, so no poll race with the client's next tick. setScale posted 1000
  // above, so lastSelectedTimeScale is 1000 and this dispatch (sole grounded plane → airborne)
  // resumes it.
  const fly2 = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
  expect(fly2.status()).toBe(200);
  const resumedBody = (await fly2.json()) as StateBody;
  expect(resumedBody.simState.paused).toBe(false); // dispatch still clears a manual pause…
  expect(resumedBody.simState.timeScale).toBe(SCALE); // …and restores the last selected speed

  // Let the return leg finish so cleanup starts from a grounded plane.
  await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.status), { timeout: 120_000 }).toBe('available');
});