"use strict";

const test = require("node:test");
const assert = require("node:assert/strict");

test("config uses defaults when env is missing", () => {
  const previous = {
    PORT: process.env.PORT,
    STATE_FILE_PATH: process.env.STATE_FILE_PATH,
  };

  delete process.env.PORT;
  delete process.env.STATE_FILE_PATH;

  delete require.cache[require.resolve("../src/config")];
  const { config } = require("../src/config");

  assert.equal(config.port, 3000);
  assert.equal(config.stateFilePath, "./data/state.json");

  if (previous.PORT === undefined) {
    delete process.env.PORT;
  } else {
    process.env.PORT = previous.PORT;
  }

  if (previous.STATE_FILE_PATH === undefined) {
    delete process.env.STATE_FILE_PATH;
  } else {
    process.env.STATE_FILE_PATH = previous.STATE_FILE_PATH;
  }
});

test("config reads state path and numeric env overrides", () => {
  const previous = {
    PORT: process.env.PORT,
    STATE_FILE_PATH: process.env.STATE_FILE_PATH,
  };

  process.env.PORT = "8080";
  process.env.STATE_FILE_PATH = "/data/prod-state.json";

  delete require.cache[require.resolve("../src/config")];
  const { config } = require("../src/config");

  assert.equal(config.port, 8080);
  assert.equal(config.stateFilePath, "/data/prod-state.json");

  if (previous.PORT === undefined) {
    delete process.env.PORT;
  } else {
    process.env.PORT = previous.PORT;
  }

  if (previous.STATE_FILE_PATH === undefined) {
    delete process.env.STATE_FILE_PATH;
  } else {
    process.env.STATE_FILE_PATH = previous.STATE_FILE_PATH;
  }
});