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-abandon-api-'));
  process.env.FLIGHT_DB_PATH = path.join(dir, 'abandon.db');
});

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

const post = (id: string) => POST(new Request(`http://localhost/api/packages/${id}/abandon`, { method: 'POST' }), {
  params: Promise.resolve({ id }),
});

// Insert a LOADED package bound to the starter plane with a long deadline. Returns
// the exact created/deadline times so tests can compute the penalty from the
// snapshot's clock (robust against however much real time the test itself takes).
async function insertLoadedPackage(id: string, reward = 1_000) {
  const { db } = await getGameDb();
  const sim = (await db.select().from(schema.simState))[0];
  const createdSimTime = sim.clockMs;
  const deadlineSimTime = createdSimTime + 24 * 3_600_000;
  await db.insert(schema.packages).values({
    id, originIcao: 'EDDF', destIcao: 'LEMD', reward, cargoType: 'Mail', cargoCount: 4,
    deadlineSimTime, status: 'loaded', planeId: 'plane-starter', createdSimTime,
  });
  return { createdSimTime, deadlineSimTime };
}

// Mirrors lib/game/penalty.ts (same formula → identical floats).
function penaltyFor(reward: number, createdSimTime: number, deadlineSimTime: number, clockMs: number): number {
  const frac = Math.min(1, Math.max(0, (clockMs - createdSimTime) / (deadlineSimTime - createdSimTime)));
  return Math.round(reward * (0.15 + 0.45 * frac) * 100) / 100;
}

describe('POST /api/packages/:id/abandon', () => {
  it('rejects an unknown id with 404', async () => {
    const res = await post('nope');
    expect(res.status).toBe(404);
    expect(((await res.json()) as { error: string }).error).toMatch(/not found/);
  });

  it('rejects an open package with 409 (nothing loaded to abandon)', async () => {
    const { db } = await getGameDb();
    await db.insert(schema.packages).values({
      id: 'p-open', originIcao: 'EDDF', destIcao: 'LEMD', reward: 1, cargoType: 'Mail', cargoCount: 1,
      deadlineSimTime: Date.now() + 3_600_000, status: 'open', planeId: null, createdSimTime: Date.now(), createdRealMs: Date.now(), // v0.65.0 — stay open past the pre-action tick
    });

    const res = await post('p-open');
    expect(res.status).toBe(409);
    expect(((await res.json()) as { error: string }).error).toMatch(/open/);
  });

  it('rejects abandoning while the plane is in flight with 409', async () => {
    await insertLoadedPackage('p-flying');
    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('p-flying');
    expect(res.status).toBe(409);
    expect(((await res.json()) as { error: string }).error).toMatch(/in flight/i);

    // 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('abandons a loaded package for the exact formula penalty and returns the full snapshot', async () => {
    const times = await insertLoadedPackage('p-ab', 1_000); // created "now" → near the 15% floor
    const { db } = await getGameDb();
    const cashBefore = (await db.select().from(schema.account))[0].cash;

    const res = await post('p-ab');
    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 }; // ISS-117
      packages: Array<{ id: string; status: string; planeId: string | null }>;
    };
    expect(Object.keys(body).sort()).toEqual([
      'account',
      'catalog',
      'fuelPricePerL',
      'packages',
      'planes',
      'sellFraction',
      'simState',
    ]);

    // Cash reduced by exactly the penalty at the snapshot's clock (15% floor + a
    // sliver of elapsed time — computed with the same formula as the server).
    const expectedPenalty = penaltyFor(1_000, times.createdSimTime, times.deadlineSimTime, body.simState.clockMs);
    expect(expectedPenalty).toBeGreaterThanOrEqual(150); // at/above the floor…
    expect(body.account.cash).toBeCloseTo(cashBefore - expectedPenalty, 6); // …and exact

    const abandoned = body.packages.find((p) => p.id === 'p-ab')!;
    expect(abandoned.status).toBe('abandoned');
    expect(abandoned.planeId).toBeNull(); // slot freed in the response too

    // Persisted, not just in the response.
    const row = (await db.select().from(schema.packages).where(eq(schema.packages.id, 'p-ab')))[0];
    expect(row.status).toBe('abandoned');
    expect(row.planeId).toBeNull(); // slot freed

    // Abandoning it again is rejected — the package is no longer loaded/expired.
    const again = await post('p-ab');
    expect(again.status).toBe(409);
  });
});