import { execSync } from 'node:child_process';
import path from 'node:path';
import { test, expect } from '@playwright/test';

// Repo root — docker-compose.yml lives here; `docker compose restart` runs on
// this host (the test runner), browsers stay remote. CI points E2E_COMPOSE_ARGS at the
// isolated stack file + project (-f docker-compose.ci.yml -p flight-ci) instead of the default one.
const repoRoot = path.join(__dirname, '..');
const composeArgs = process.env.E2E_COMPOSE_ARGS ?? '';

interface StateBody {
  account: { cash: number; reputation: number };
  simState: { clockMs: number; timeScale: number; paused: boolean };
  planes: Array<Record<string, unknown>>;
  packages: Array<Record<string, unknown>>;
}

test('GET /api/state returns a seeded snapshot', async ({ page }) => {
  const res = await page.request.get('/api/state');
  expect(res.status()).toBe(200);
  expect(res.headers()['content-type']).toContain('application/json');
  const body = (await res.json()) as StateBody;

  expect(typeof body.account.cash).toBe('number');
  expect(typeof body.account.reputation).toBe('number');

  expect(typeof body.simState.clockMs).toBe('number');
  expect(typeof body.simState.timeScale).toBe('number');
  expect(body.simState.paused).toBe(false);

  expect(Array.isArray(body.planes)).toBe(true);
  expect(body.planes.length).toBeGreaterThanOrEqual(1);
  for (const key of ['id', 'model', 'status', 'fuel', 'maxFuel', 'locationIcao', 'locationName', 'lat', 'lon']) {
    expect(body.planes[0], `plane.${key}`).toHaveProperty(key);
  }

  expect(Array.isArray(body.packages)).toBe(true);
  expect(body.packages.length).toBeGreaterThan(0);
  for (const key of ['id', 'originIcao', 'destIcao', 'reward', 'cargoType', 'weightKg', 'deadlineSimTime', 'status']) {
    expect(body.packages[0], `package.${key}`).toHaveProperty(key);
  }
});

test('state survives a container restart (sim clock + account persisted)', async ({ page }) => {
  test.setTimeout(180_000);

  const resBefore = await page.request.get('/api/state');
  expect(resBefore.status()).toBe(200);
  const before = (await resBefore.json()) as StateBody;

  execSync(`docker compose ${composeArgs} restart flight`, { cwd: repoRoot, stdio: 'pipe' });

  // Wait for the app to come back, capturing the post-restart snapshot.
  let after: StateBody | undefined;
  await expect
    .poll(async () => {
      try {
        const res = await page.request.get('/api/state');
        if (res.status() === 200) after = (await res.json()) as StateBody;
        return !!after;
      } catch {
        return false; // connection refused / 502 while the container starts
      }
    }, { timeout: 120_000, message: 'waiting for /api/state after docker compose restart' })
    .toBe(true);

  expect(after).toBeDefined();
  const a = after!;

  // The DB file on the volume must be loaded, not re-seeded (PLAN.md: "sim clock
  // persisted across sessions"): account and entity ids are byte-identical.
  // v0.7.0 tick-on-read caveat: every GET advances the clock by at most one
  // clamped tick (MAX_TICK_ELAPSED_MS × timeScale, see lib/sim/engine.ts), so the
  // post-restart clock may be ahead — but never by more than that bound.
  expect(a.simState.clockMs).toBeGreaterThanOrEqual(before.simState.clockMs);
  const MAX_TICK_ELAPSED_MS = 2_000; // must match lib/sim/engine.ts
  expect(a.simState.clockMs - before.simState.clockMs).toBeLessThanOrEqual(
    MAX_TICK_ELAPSED_MS * a.simState.timeScale,
  );
  expect(a.account.cash).toBe(before.account.cash);
  expect(a.account.reputation).toBe(before.account.reputation);
  expect(a.planes.map((p) => p.id).sort()).toEqual(before.planes.map((p) => p.id).sort());
  expect(a.packages.map((p) => p.id).sort()).toEqual(before.packages.map((p) => p.id).sort());
});