import fs from 'node:fs/promises';
import os from 'node:os';
import path from 'node:path';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';
import { openGameDb, persist } from './client';
import * as schema from './schema';

let dir: string;

beforeAll(async () => {
  dir = await fs.mkdtemp(path.join(os.tmpdir(), 'flight-db-'));
});

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

describe('openGameDb', () => {
  it('seeds a fresh DB file on first open and persists it to disk', async () => {
    const file = path.join(dir, 'fresh.db');
    const inst = await openGameDb(file);

    const planes = await inst.db.select().from(schema.planes);
    expect(planes).toHaveLength(1);
    expect(planes[0].id).toBe('plane-starter');
    expect(planes[0].status).toBe('available');
    expect(planes[0].locationIcao).toBe('EDDF'); // Frankfurt hub from the CSV
    expect(planes[0].fuel).toBe(planes[0].maxFuel);

    const contracts = await inst.db.select().from(schema.contracts);
    expect(contracts.length).toBeGreaterThanOrEqual(8);
    expect(contracts.every((c) => c.status === 'open')).toBe(true);

    const account = (await inst.db.select().from(schema.account))[0];
    expect(account?.cash).toBeGreaterThan(0);
    const sim = (await inst.db.select().from(schema.simState))[0];
    expect(sim?.paused).toBe(false);
    expect(sim?.timeScale).toBe(1);

    // The seed was durably written: the file exists and is non-empty.
    const st = await fs.stat(file);
    expect(st.size).toBeGreaterThan(0);
  });

  it('does not re-seed an existing DB — state survives reopen', async () => {
    const file = path.join(dir, 'reopen.db');
    const first = await openGameDb(file);
    const contracts1 = (await first.db.select().from(schema.contracts)).map((c) => c.id).sort();
    const account1 = (await first.db.select().from(schema.account))[0];

    // Simulate a process restart: brand-new instance over the same file.
    const second = await openGameDb(file);
    const contracts2 = (await second.db.select().from(schema.contracts)).map((c) => c.id).sort();
    expect(contracts2).toEqual(contracts1);
    expect((await second.db.select().from(schema.account))[0]).toEqual(account1);
  });

  it('persist() durably saves writes made after open', async () => {
    const file = path.join(dir, 'write.db');
    const inst = await openGameDb(file);

    await inst.db.update(schema.account).set({ cash: 12345 });
    await persist(inst);

    // A fresh instance over the same file sees the update.
    const reloaded = await openGameDb(file);
    expect((await reloaded.db.select().from(schema.account))[0]?.cash).toBe(12345);
  });
});