import { execSync } from 'node:child_process';
import path from 'node:path';
import { expect, test } 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 space-wanderer-ci) instead of the default one.
const repoRoot = path.join(__dirname, '..');
const composeArgs = process.env.E2E_COMPOSE_ARGS ?? '';

// Mirrors the /api/world response shape (lib/game/save.ts) — kept local so the spec stays self-contained.
interface WorldSystemDto { id: number; name: string; x: number; y: number; discovered: boolean; current: boolean }
interface WorldState { systems: WorldSystemDto[]; edges: [number, number][]; turn: number }

test('app survives a container restart (stack + volume persistence)', async ({ page }) => {
  test.setTimeout(180_000);

  // Baseline: the app serves and reports its version.
  const resBefore = await page.request.get('/api/version');
  expect(resBefore.status()).toBe(200);
  const before = (await resBefore.json()) as { version: string };
  expect(before.version).toMatch(/^\d+\.\d+\.\d+$/);

  // Game-state baseline: jump once so there is real progress that must survive the restart.
  const worldBefore = (await (await page.request.get('/api/world')).json()) as WorldState;
  const currentId = worldBefore.systems.find((s) => s.current)!.id;
  const edge = worldBefore.edges.find(([a, b]) => a === currentId || b === currentId)!;
  const targetId = edge[0] === currentId ? edge[1] : edge[0];
  const jumpRes = await page.request.post('/api/jump', { data: { systemId: targetId } });
  expect(jumpRes.status()).toBe(200);
  const worldJumped = (await jumpRes.json()) as WorldState;

  // Restart the app container mid-run — the named DB volume must survive it.
  execSync(`docker compose ${composeArgs} restart space-wanderer`, { cwd: repoRoot, stdio: 'pipe' });

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

  expect(after).toBeDefined();
  expect(after!.version).toBe(before.version); // same build, not a re-seeded stack

  // Game state survived: same turn counter and jumped-to current system as before the restart.
  const worldAfter = (await (await page.request.get('/api/world')).json()) as WorldState;
  expect(worldAfter.turn).toBe(worldJumped.turn);
  expect(worldAfter.systems.find((s) => s.current)?.id).toBe(targetId);

  // The page itself serves again with the landing title.
  await page.goto('/');
  await expect(page.getByRole('heading', { name: 'SpaceWanderer' })).toBeVisible();
});