import assert from "node:assert/strict";
import { existsSync, mkdirSync, mkdtempSync, readFileSync } from "node:fs";
import { tmpdir } from "node:os";
import path from "node:path";
import test, { before } from "node:test";

/** Rota POST /api/cache/sync e gravação concorrente no cache JSON, em pasta temporária. */

let POST: (req: import("next/server").NextRequest) => Promise<Response>;
let NextRequestCtor: typeof import("next/server").NextRequest;
let JsonCacheManager: typeof import("../lib/jsonCacheManager.ts").JsonCacheManager;
let cacheFile: string;

before(async () => {
  const dir = mkdtempSync(path.join(tmpdir(), "nutriscan-sync-"));
  mkdirSync(path.join(dir, "data"));
  cacheFile = path.join(dir, "data", "products-cache.json");
  process.chdir(dir);

  console.log = () => {};
  console.error = () => {};

  ({ POST } = await import("../app/api/cache/sync/route.ts"));
  ({ NextRequest: NextRequestCtor } = await import("next/server"));
  ({ JsonCacheManager } = await import("../lib/jsonCacheManager.ts"));
});

async function post(body: string) {
  const req = new NextRequestCtor("http://localhost/api/cache/sync", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body,
  });
  const res = await POST(req);
  return { status: res.status, body: (await res.json()) as Record<string, unknown> };
}

const readCache = () => JSON.parse(readFileSync(cacheFile, "utf-8")) as { products: Record<string, { product_name: string }> };

test("corpo que não é JSON, sem products ou com products fora de lista responde 400", async () => {
  for (const body of ["não é json", "{}", "null", '{"products":"x"}', '{"products":{"a":1}}']) {
    const { status, body: json } = await post(body);
    assert.equal(status, 400, body);
    assert.equal(json.error, "Produtos inválidos");
  }
});

test("lista vazia é aceita", async () => {
  const { status, body } = await post('{"products":[]}');
  assert.equal(status, 200);
  assert.deepEqual(body, { success: true, saved: 0, failed: 0 });
});

test("só produtos com code numérico são gravados; os demais contam como falha", async () => {
  const products = [
    { code: "7622210575975", product_name: "Válido" },
    { code: "__proto__", product_name: "Chave perigosa" },
    { code: "abc", product_name: "Não numérico" },
    { code: 123, product_name: "Número" },
    { product_name: "Sem code" },
    null,
    "texto",
  ];
  const { status, body } = await post(JSON.stringify({ products }));
  assert.equal(status, 200);
  assert.deepEqual(body, { success: true, saved: 1, failed: 6 });
  assert.deepEqual(Object.keys(readCache().products), ["7622210575975"]);
});

test("gravações simultâneas não corrompem o arquivo nem deixam temporário", async () => {
  const manager = new JsonCacheManager();
  const batches = Array.from({ length: 25 }, (_, b) =>
    Array.from({ length: 40 }, (_, i) => ({ code: String(1000 + b * 40 + i), product_name: `Produto ${b}-${i}` }))
  );
  await Promise.all(batches.map((batch) => manager.saveProducts(batch)));

  const saved = readCache();
  assert.equal(Object.keys(saved.products).length, 1000 + 1);
  assert.equal(existsSync(`${cacheFile}.tmp`), false);
});