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

// v0.12.0 — right Jobs & Market pane against the live origin: open packages render with
// names/reward/deadline and Load (UI click) binds one to the starter; the on-board list shows
// loaded packages with fly-to-destination + abandon buttons (penalty preview from the same
// formula as the server); flying planes show their current leg; market buy/sell/refuel previews
// match the catalog + economy constants exposed in /api/state. Packages are created via
// POST /api/test/create-package (FLIGHT_TEST_HOOKS=1), same pattern as e2e/actions.spec.ts.

const SCALE = 1000; // fastest sim speed (v0.14.0 ladder top) — keeps flights to seconds of real time
const HUB = 'EDDF'; // must match HUB_ICAO in lib/game/seed.ts

interface PlaneState {
  id: string;
  model: string;
  status: 'available' | 'flying';
  fuel: number;
  maxFuel: number;
  locationIcao: string;
  destIcao: string | null;
}

interface PackageState {
  id: string;
  originName: string;
  destName: string;
  reward: number;
  status: 'open' | 'loaded' | 'delivered' | 'expired' | 'abandoned';
  planeId: string | null;
  createdSimTime: number;
  deadlineSimTime: number;
}

interface CatalogEntry {
  model: string;
  label: string;
  price: number;
  maxFuel: number;
  burnPerKm: number;
  emptyWeightKg: number; // v0.16.0 weighted burn input
  speedKmh: number;
  capacity: number;
}

interface StateBody {
  account: { cash: number; reputation: number };
  simState: { clockMs: number; timeScale: number; paused: boolean };
  planes: PlaneState[];
  packages: PackageState[];
  catalog: CatalogEntry[];
  fuelPricePerL: number;
  sellFraction: number;
}

// Mirrors formatCash in lib/format.ts (same Intl settings → identical strings).
const eur = (v: number) => new Intl.NumberFormat('en-US', { style: 'currency', currency: 'EUR' }).format(v);

async function getState(page: Page): Promise<StateBody> {
  const res = await page.request.get('/api/state');
  expect(res.status()).toBe(200);
  return (await res.json()) as StateBody;
}

async function postSim(page: Page, body: unknown) {
  return page.request.post('/api/sim', { data: body });
}

// Set the time scale and VERIFY from the response that it stuck — a silent reset would
// otherwise surface as an unexplained landing-wait timeout.
async function setScale(page: Page, scale: number): Promise<void> {
  const res = await page.request.post('/api/sim', { data: { timeScale: scale } });
  expect(res.status()).toBe(200);
  const body = (await res.json()) as { timeScale: number };
  expect(body.timeScale, `timeScale should be ${scale} after POST /api/sim`).toBe(scale);
}

// Leave the live instance in a sane state for the other specs (scale 1, running).
test.afterEach(async ({ page }) => {
  const res = await postSim(page, { timeScale: 1, paused: false });
  expect(res.status()).toBe(200);
});

// Mirrors haversineKm in lib/geo.ts (same formula → identical floats).
function haversineKm(lat1: number, lon1: number, lat2: number, lon2: number): number {
  const toRad = (d: number) => (d * Math.PI) / 180;
  const dLat = toRad(lat2 - lat1);
  const dLon = toRad(lon2 - lon1);
  const a =
    Math.sin(dLat / 2) ** 2 +
    Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) * Math.sin(dLon / 2) ** 2;
  return 2 * 6371 * Math.asin(Math.min(1, Math.sqrt(a)));
}

// Mirrors lib/game/penalty.ts — the exact abandon penalty at a given game clock.
function penaltyFor(reward: number, createdSimTime: number, deadlineSimTime: number, clockMs: number): number {
  const span = deadlineSimTime - createdSimTime;
  const frac = span > 0 ? Math.min(1, Math.max(0, (clockMs - createdSimTime) / span)) : 1;
  return Math.round(reward * (0.15 + 0.45 * frac) * 100) / 100;
}

// Closest airport to EDDF from /api/airports → shortest possible arrival time at scale 1000.
async function nearestToHub(page: Page): Promise<{ icao: string; lat: number; lon: number }> {
  const fc = (await (await page.request.get('/api/airports')).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;
    if (haversineKm(hub.lat, hub.lon, f.properties.lat, f.properties.lon) < haversineKm(hub.lat, hub.lon, nearest.lat, nearest.lon)) {
      nearest = f.properties;
    }
  }
  return nearest;
}

// Farthest airport from EDDF whose leg still FITS A FULL TANK — the longest flyable leg (v0.16.0
// refuel-for-flight test). The dataset's absolute farthest can exceed the aircraft's range (UNNT is
// ~4803 km out and needs ~6955 L > the 6300 L tank), so a full-tank fly there would rightly 409;
// this test wants a long-but-flyable leg instead.
async function farthestFlyableToHub(
  page: Page,
  entry: CatalogEntry,
): Promise<{ icao: string; lat: number; lon: number; hubLat: number; hubLon: number }> {
  const fc = (await (await page.request.get('/api/airports')).json()) as {
    features: Array<{ properties: { icao: string; lat: number; lon: number } }>;
  };
  const hub = fc.features.find((f) => f.properties.icao === HUB)!.properties;
  let farthest: { icao: string; lat: number; lon: number; d: number } | null = null;
  for (const f of fc.features) {
    if (f.properties.icao === HUB) continue;
    const d = haversineKm(hub.lat, hub.lon, f.properties.lat, f.properties.lon);
    if (requiredFuelFor(entry.burnPerKm, entry.emptyWeightKg, entry.maxFuel, d) > entry.maxFuel) continue; // beyond range
    if (!farthest || d > farthest.d) {
      farthest = { icao: f.properties.icao, lat: f.properties.lat, lon: f.properties.lon, d };
    }
  }
  if (!farthest) throw new Error('no full-tank-flyable airport found in the dataset');
  return { ...farthest, hubLat: hub.lat, hubLon: hub.lon };
}

// Mirrors lib/sim/movement.ts (v0.16.0): fuel required to cover distanceKm arriving empty —
// closed form of the weight-proportional burn model, k calibrated so a full tank burns burnPerKm.
const FUEL_DENSITY_KG_PER_L = 0.8; // must match FUEL_DENSITY_KG_PER_L in lib/sim/movement.ts
function requiredFuelFor(burnPerKm: number, emptyWeightKg: number, maxFuel: number, distanceKm: number): number {
  const k = burnPerKm / (emptyWeightKg + FUEL_DENSITY_KG_PER_L * maxFuel);
  return (emptyWeightKg / FUEL_DENSITY_KG_PER_L) * (Math.exp(k * FUEL_DENSITY_KG_PER_L * distanceKm) - 1);
}

// Test hook (FLIGHT_TEST_HOOKS=1): create an open package on a known route.
async function createPackage(page: Page, fromIcao: string, toIcao: string, deadlineOffsetMs?: number): Promise<PackageState> {
  const created = await page.request.post('/api/test/create-package', {
    data: { originIcao: fromIcao, destIcao: toIcao, deadlineOffsetMs },
  });
  expect(created.status()).toBe(201);
  return (await created.json()) as PackageState;
}

// Self-heal: let any in-flight leg finish, then reposition plane-starter home via the API.
async function flyHomeViaApi(page: Page): Promise<void> {
  const s0 = await getState(page);
  const starter = s0.planes.find((p) => p.id === 'plane-starter')!;
  if (starter.status === 'flying' || starter.locationIcao !== HUB) {
    // Fast-forward any leftover leg / repositioning flight (~20 s real time worst case at 1000×).
    await setScale(page, SCALE);
  }
  if (starter.status === 'flying') {
    await expect
      .poll(async () => (await getState(page)).planes.find((p) => p.id === 'plane-starter')?.status === 'available', {
        timeout: 240_000,
        message: 'waiting for an in-flight plane-starter to land',
      })
      .toBe(true);
  }
  if (starter.locationIcao !== HUB) {
    // ISS-011: the landing above auto-slown the sim to 1× — re-set SCALE so the return leg
    // fast-forwards instead of taking real-time hours.
    await setScale(page, SCALE);
    const res = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
    expect(res.status()).toBe(200); // repositioning needs no package (v0.12.0 manual flight)
    await expect
      .poll(async () => (await getState(page)).planes.find((p) => p.id === 'plane-starter')?.locationIcao === HUB, {
        timeout: 240_000,
        message: 'waiting for plane-starter to land back at the hub',
      })
      .toBe(true);
  }
}

test('open packages render with names, reward and deadline; Load is enabled at a package origin', async ({ page }) => {
  test.setTimeout(300_000); // self-heal can take minutes after an interrupted run
  await flyHomeViaApi(page); // deterministic: the starter sits at EDDF

  await page.goto('/');
  const right = page.getByTestId('right-pane');
  await expect(right).toBeVisible({ timeout: 15_000 });

  // ≥1 open package row once the first snapshot lands — route, reward (€) and a Load button.
  const rows = page.locator('li[data-testid^="open-package-"]');
  await expect(rows.first(), 'an open package row appears').toBeVisible({ timeout: 15_000 });
  await expect(rows.first()).toContainText(/→/);
  await expect(page.locator('[data-testid^="open-package-reward-"]').first()).toContainText('€');

  // Deterministic target: a hook-created EDDF package — Load is enabled (starter at origin, free slot).
  const nearest = await nearestToHub(page);
  const pkg = await createPackage(page, HUB, nearest.icao);
  const row = page.locator(`li[data-testid="open-package-${pkg.id}"]`);
  await expect(row, 'the hook-created package appears in the list').toBeVisible({ timeout: 15_000 });
  await expect(page.getByTestId(`open-package-reward-${pkg.id}`)).toContainText(eur(pkg.reward));
  const loadBtn = page.getByTestId(`load-${pkg.id}`);
  await expect(loadBtn).toBeEnabled();

  // Load through the UI — exactly one eligible plane, so the button acts directly.
  await loadBtn.click();
  const body = await getState(page);
  expect(body.packages.find((p) => p.id === pkg.id)?.status).toBe('loaded');
  expect(body.packages.find((p) => p.id === pkg.id)?.planeId).toBe('plane-starter');

  // The loaded package leaves the open list and shows in the on-board section.
  await expect(row).not.toBeVisible();
  await expect(page.getByTestId(`onboard-package-${pkg.id}`)).toBeVisible({ timeout: 10_000 });
});

test('Load is disabled when no plane sits at the package origin', async ({ page }) => {
  test.setTimeout(300_000); // self-heal can take minutes after an interrupted run
  await flyHomeViaApi(page); // starter at EDDF — a Madrid-origin package cannot be loaded here

  const pkg = await createPackage(page, 'LEMD', HUB);
  await page.goto('/');
  const row = page.locator(`li[data-testid="open-package-${pkg.id}"]`);
  await expect(row).toBeVisible({ timeout: 15_000 });
  await expect(page.getByTestId(`load-${pkg.id}`)).toBeDisabled();
});

test('on-board list: fly-to-destination + abandon with penalty preview; flying planes show their leg', async ({ page }) => {
  test.setTimeout(240_000); // one short flight at scale 1000 (seconds of real time) plus UI steps
  await flyHomeViaApi(page);

  const nearest = await nearestToHub(page);
  const pkg = await createPackage(page, HUB, nearest.icao, 24 * 3_600_000);
  const loadRes = await page.request.post(`/api/packages/${pkg.id}/load`, { data: { planeId: 'plane-starter' } });
  expect(loadRes.status()).toBe(200);

  await page.goto('/');
  const onboardRow = page.getByTestId(`onboard-package-${pkg.id}`);
  await expect(onboardRow, 'loaded package appears in the on-board list').toBeVisible({ timeout: 15_000 });

  // The abandon button previews the exact penalty at the snapshot's clock (same formula as the server).
  // Freeze the clock first so every snapshot — mine and the UI's last poll — shares one clock value,
  // making the preview deterministic instead of racing the 1 s poll loop.
  await postSim(page, { paused: true });
  const state = await getState(page);
  const expectedPenalty = penaltyFor(pkg.reward, pkg.createdSimTime, pkg.deadlineSimTime, state.simState.clockMs);
  await expect(page.getByTestId(`abandon-penalty-${pkg.id}`)).toContainText(eur(expectedPenalty));

  // Fly to the destination through the UI — the button is the destination's name.
  const flyBtn = page.getByTestId(`fly-to-${pkg.id}`);
  await expect(flyBtn).toBeEnabled();
  await flyBtn.click();

  // The on-board block now shows the plane in flight with its current leg…
  await expect(page.getByTestId('onboard-plane-starter')).toContainText(/in flight/i, { timeout: 10_000 });
  const leg = page.getByTestId('plane-leg-plane-starter');
  await expect(leg).toBeVisible();
  await expect(leg).toContainText('→');

  // …and /api/state agrees.
  let body = await getState(page);
  expect(body.planes.find((p) => p.id === 'plane-starter')!.status).toBe('flying');
  expect(body.planes.find((p) => p.id === 'plane-starter')!.destIcao).toBe(nearest.icao);

  // Resume and fast-forward to arrival (poll the authoritative state).
  await postSim(page, { paused: false });
  await setScale(page, SCALE);
  await expect
    .poll(async () => {
      const b = await getState(page);
      const p = b.planes.find((x) => x.id === 'plane-starter');
      return !!p && p.status === 'available' && p.locationIcao === nearest.icao;
    }, { timeout: 120_000, message: `waiting for arrival at ${nearest.icao} (scale 1000)` })
    .toBe(true);

  // The in-deadline package was delivered on arrival — it leaves the on-board list…
  body = await getState(page);
  expect(body.packages.find((p) => p.id === pkg.id)?.status).toBe('delivered');
  await expect(onboardRow).not.toBeVisible({ timeout: 15_000 });

  // Restore: fly home so the live instance stays in its onboarding state for the next run.
  // ISS-011: the arrival above auto-slown the sim to 1×, so re-set SCALE for this leg.
  await setScale(page, SCALE);
  const homeRes = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
  expect(homeRes.status()).toBe(200);
  await expect
    .poll(async () => (await getState(page)).planes.find((p) => p.id === 'plane-starter')?.locationIcao === HUB, {
      timeout: 120_000,
      message: 'waiting for plane-starter to land back at the hub',
    })
    .toBe(true);
});

test('market buy/sell/refuel render with previews from the catalog in /api/state; refuel deducts exactly', async ({ page }) => {
  test.setTimeout(300_000); // self-heal can take minutes after an interrupted run
  await flyHomeViaApi(page); // grounded starter at EDDF (tank partial after the previous test's flight)

  const body = await getState(page); // authoritative catalog + economy constants (v0.10.0)
  expect(body.catalog.length).toBeGreaterThan(0);
  const entry = body.catalog.find((e) => e.model === 'atr72')!;
  expect(entry.capacity).toBe(6); // v0.12.0 slot capacity exposed in the snapshot

  await page.goto('/');
  // Buy: the model picker lists the catalog entry and the price preview is its full price.
  const buyModel = page.getByTestId('market-buy-model');
  await expect(buyModel).toBeVisible({ timeout: 15_000 });
  await expect(buyModel.locator(`option[value="${entry.model}"]`)).toHaveText(entry.label);
  await expect(page.getByTestId('market-buy-price')).toContainText(eur(entry.price));
  await expect(page.getByTestId('market-buy')).toBeVisible();

  // Sell: the grounded-plane picker lists plane-starter and the payout preview is
  // sellFraction × price, both from the snapshot's catalog/constants.
  const starter = body.planes.find((p) => p.id === 'plane-starter')!;
  expect(starter.status).toBe('available');
  await page.getByTestId('market-sell-plane').selectOption('plane-starter', { timeout: 15_000 });
  const payout = Math.round(entry.price * body.sellFraction * 100) / 100;
  await expect(page.getByTestId('market-sell-payout')).toContainText(eur(payout));

  // Refuel through the pane: the flight genuinely burned fuel…
  if (starter.fuel < starter.maxFuel) {
    const expectedCost = Math.round((starter.maxFuel - starter.fuel) * body.fuelPricePerL * 100) / 100;
    const cashBefore = body.account.cash;

    // …the refuel picker lists it, the preview matches the exact cost, and the click deducts it.
    await expect(page.getByTestId('market-refuel-plane')).toBeVisible({ timeout: 15_000 });
    await page.getByTestId('market-refuel-plane').selectOption('plane-starter');
    await expect(page.getByTestId('market-refuel-cost')).toContainText(eur(expectedCost));
    await page.getByTestId('market-refuel').click();

    // Cash decreased by exactly the expected cost and the tank is full (server truth).
    await expect
      .poll(async () => {
        const b = await getState(page);
        return Math.abs(b.account.cash - (cashBefore - expectedCost)) < 0.001;
      }, { timeout: 15_000, message: 'waiting for the refuel cost to land in /api/state' })
      .toBe(true);
    const after = await getState(page);
    expect(after.planes.find((p) => p.id === 'plane-starter')!.fuel).toBe(starter.maxFuel);
  }
});

test('on-board row Refuel tops up just enough for the package leg; market button says "Refuel to full"', async ({ page }) => {
  test.setTimeout(300_000); // self-heal + one long flight each way at scale 1000
  await flyHomeViaApi(page);

  const body = await getState(page);
  const entry = body.catalog.find((e) => e.model === 'atr72')!;

  // Deterministic baseline: a full tank.
  expect((await page.request.post('/api/planes/plane-starter/refuel')).status()).toBe(200);

  // Longest FLYABLE leg from the hub (fits a full tank) — long enough that "just enough" for it
  // exceeds what's left on arrival.
  const farthest = await farthestFlyableToHub(page, entry);
  const pkg1 = await createPackage(page, HUB, farthest.icao, 24 * 3_600_000);
  expect((await page.request.post(`/api/packages/${pkg1.id}/load`, { data: { planeId: 'plane-starter' } })).status()).toBe(200);

  // Fly there (delivers pkg1 on arrival) — the tank is now partial.
  expect((await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: farthest.icao } })).status()).toBe(200);
  await setScale(page, SCALE);
  await expect
    .poll(async () => {
      const b = await getState(page);
      const p = b.planes.find((x) => x.id === 'plane-starter');
      return !!p && p.status === 'available' && p.locationIcao === farthest.icao;
    }, { timeout: 240_000, message: `waiting for arrival at ${farthest.icao} (scale 1000)` })
    .toBe(true);

  // New work at the far end: a package back to the hub — its leg is exactly what we refuel for.
  const pkg2 = await createPackage(page, farthest.icao, HUB, 24 * 3_600_000);
  expect((await page.request.post(`/api/packages/${pkg2.id}/load`, { data: { planeId: 'plane-starter' } })).status()).toBe(200);

  // Expected "just enough" from the snapshot constants (mirrors requiredFuelFor in lib/sim/movement.ts).
  const pre = await getState(page);
  const fuelBefore = pre.planes.find((p) => p.id === 'plane-starter')!.fuel;
  const cashBefore = pre.account.cash;
  const km = haversineKm(farthest.hubLat, farthest.hubLon, farthest.lat, farthest.lon); // symmetric: hub ↔ far end
  const liters = Math.max(0, requiredFuelFor(entry.burnPerKm, entry.emptyWeightKg, entry.maxFuel, km) - fuelBefore);
  expect(liters).toBeGreaterThan(0); // the long leg genuinely needs more than what's left
  const expectedCost = Math.round(liters * pre.fuelPricePerL * 100) / 100;

  await page.goto('/');
  const refuelBtn = page.getByTestId(`refuel-for-${pkg2.id}`);
  await expect(refuelBtn, 'row Refuel button appears for the loaded package').toBeVisible({ timeout: 15_000 });
  // Capture the endpoint's OWN response — the full post-action snapshot at the action's clock.
  const [res] = await Promise.all([
    page.waitForResponse((r) => r.url().includes(`/api/planes/plane-starter/refuel`), { timeout: 15_000 }),
    refuelBtn.click(),
  ]);
  expect(res.status()).toBe(200);
  const post = (await res.json()) as StateBody;

  // Cash dropped by exactly L × price and fuel rose by exactly L.
  expect(post.account.cash).toBeCloseTo(cashBefore - expectedCost, 6);
  expect(post.planes.find((p) => p.id === 'plane-starter')!.fuel).toBeCloseTo(fuelBefore + liters, 6);

  // Market row: the fill-up button is labeled "Refuel to full" (testid unchanged).
  await expect(page.getByTestId('market-refuel')).toHaveText('Refuel to full');

  // Restore: fly home — pkg2's destination IS the hub, so it delivers on arrival. The tank holds
  // exactly the leg requirement, so this also proves "just enough" is enough. ISS-011: the far-end
  // arrival above auto-slown the sim to 1×, so re-set SCALE for this leg.
  await setScale(page, SCALE);
  expect((await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } })).status()).toBe(200);
  await expect
    .poll(async () => (await getState(page)).planes.find((p) => p.id === 'plane-starter')?.locationIcao === HUB, {
      timeout: 240_000,
      message: 'waiting for plane-starter to land back at the hub',
    })
    .toBe(true);
  // Top the tank back up so later specs start with a full tank.
  expect((await page.request.post('/api/planes/plane-starter/refuel')).status()).toBe(200);
});