import fs from 'node:fs/promises';
import os from 'node:os';
import path from 'node:path';
import { eq } from 'drizzle-orm';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';
import * as schema from '@/lib/db/schema';
import { getGameDb } from '@/lib/db/client';
import { POST } from './route';

let dir: string;

beforeAll(async () => {
  // Same pattern as app/api/state/route.test.ts: point the DB singleton at a
  // throwaway file (fresh module registry per test file → fresh singleton).
  dir = await fs.mkdtemp(path.join(os.tmpdir(), 'flight-fly-api-'));
  process.env.FLIGHT_DB_PATH = path.join(dir, 'fly.db');
});

afterAll(async () => {
  delete process.env.FLIGHT_DB_PATH;
  await fs.rm(dir, { recursive: true, force: true });
});

const post = (planeId: string, body: unknown) =>
  POST(new Request(`http://localhost/api/planes/${planeId}/fly`, { method: 'POST', body: JSON.stringify(body) }), {
    params: Promise.resolve({ planeId }),
  });

describe('POST /api/planes/:planeId/fly', () => {
  it('rejects a missing/non-string destIcao and unknown fields with 400', async () => {
    for (const body of [{}, { destIcao: 42 }, { bogus: 1 }]) {
      const res = await post('plane-starter', body);
      expect(res.status).toBe(400);
      expect(((await res.json()) as { error: string }).error).toBeTruthy();
    }
  });

  it('rejects an ICAO not in the airport dataset with 400', async () => {
    const res = await post('plane-starter', { destIcao: 'ZZZZ' });
    expect(res.status).toBe(400);
    expect(((await res.json()) as { error: string }).error).toMatch(/unknown airport/);
  });

  it('rejects an unknown plane id with 404', async () => {
    const res = await post('ghost-plane', { destIcao: 'LEMD' });
    expect(res.status).toBe(404);
    expect(((await res.json()) as { error: string }).error).toMatch(/not found/);
  });

  it('rejects a flying plane with 409', async () => {
    const { db } = await getGameDb();
    await db.update(schema.planes)
      .set({ status: 'flying', departureSimTime: Date.now(), destIcao: 'LEMD' })
      .where(eq(schema.planes.id, 'plane-starter'));

    const res = await post('plane-starter', { destIcao: 'EDDM' });
    expect(res.status).toBe(409);
    expect(((await res.json()) as { error: string }).error).toMatch(/flying/);

    // Ground it again for later tests.
    await db.update(schema.planes)
      .set({ status: 'available', departureSimTime: null, destIcao: null })
      .where(eq(schema.planes.id, 'plane-starter'));
  });

  it('rejects a leg that does not fit even a full tank with 409 (ISS-082 backstop)', async () => {
    const { db } = await getGameDb();
    // UNNT → LPPD ≈ 7670 km needs ~10k L — beyond the ATR's 6300 L tank, so no auto-refuel can make it flyable.
    await db.update(schema.planes).set({ locationIcao: 'UNNT' }).where(eq(schema.planes.id, 'plane-starter'));

    const res = await post('plane-starter', { destIcao: 'LPPD' });
    expect(res.status).toBe(409);
    expect(((await res.json()) as { error: string }).error).toMatch(/insufficient fuel/i);

    // Put the starter back at the hub for later tests.
    await db.update(schema.planes).set({ locationIcao: 'EDDF' }).where(eq(schema.planes.id, 'plane-starter'));
  });

  it('flies the plane and returns the full snapshot with departure + destination set', async () => {
    const res = await post('plane-starter', { destIcao: 'LEMD' });
    expect(res.status).toBe(200);
    expect(res.headers.get('content-type')).toContain('application/json');

    // Response convention (v0.8.0): the FULL snapshot, same shape as GET /api/state.
    const body = (await res.json()) as {
      account: { cash: number };
      simState: { clockMs: number; timeScale: number; paused: boolean };
      planes: Array<{ id: string; status: string; destIcao: string | null; departureSimTime: number | null; locationIcao: string }>;
    };
    expect(Object.keys(body).sort()).toEqual([
      'account',
      'catalog',
      'fuelPricePerL',
      'packages',
      'planes',
      'sellFraction',
      'simState',
    ]);

    const plane = body.planes.find((p) => p.id === 'plane-starter')!;
    expect(plane.status).toBe('flying');
    expect(plane.destIcao).toBe('LEMD'); // destination set at fly time (v0.12.0)
    expect(typeof plane.departureSimTime).toBe('number'); // departure set at fly time
    expect(plane.locationIcao).toBe('EDDF'); // origin unchanged until arrival

    // A second flight of the same (now flying) plane is rejected — it is no longer available.
    const again = await post('plane-starter', { destIcao: 'EDDM' });
    expect(again.status).toBe(409);
  });
});