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

function runtime(storage = new Map()) {
  const counts = { location: 0, request: 0 };
  let fail = false;
  let release;
  const module = { exports: {} };
  vm.runInNewContext(fs.readFileSync("pets-fe/utils/environment.js", "utf8"), {
    module,
    wx: {
      getStorageSync: (key) => storage.get(key),
      setStorageSync: (key, value) => storage.set(key, value),
      getSetting: (opts) => opts.success({ authSetting: {} }),
      getLocation: (opts) => {
        counts.location++;
        opts.success({ latitude: 25, longitude: 102 });
      },
    },
    require: () => ({
      secure: async () => {
        counts.request++;
        if (fail) throw new Error("offline");
        if (release) await release;
        return {
          location_name: "昆明市 · 五华区",
          weather: { description: "晴", temperature: "22" },
        };
      },
    }),
  });
  return {
    api: module.exports,
    counts,
    storage,
    fail: () => {
      fail = true;
    },
    hold: (promise) => {
      release = promise;
    },
  };
}

test("页面重建与返回复用同一轮天气请求，点击可以刷新", async () => {
  const r = runtime();
  let finish;
  r.hold(
    new Promise((resolve) => {
      finish = resolve;
    }),
  );
  const first = r.api.refresh();
  assert.equal(r.api.refresh(), first);
  finish();
  await first;
  await r.api.refresh();
  await r.api.refresh();
  assert.equal(r.counts.location, 1);
  assert.equal(r.counts.request, 1);
  await r.api.refresh(true);
  assert.equal(r.counts.request, 2);
  assert.equal(r.api.cached().weatherLabel, "晴 22°C");
  const saved = r.storage.get("pet_environment_v1");
  assert.equal("latitude" in saved, false);
  assert.equal("longitude" in saved, false);
});

test("冷启动先读取上次缓存，再请求一次；失败保留缓存且不会返回就重试", async () => {
  const previous = runtime();
  await previous.api.refresh();
  const next = runtime(previous.storage);
  assert.equal(next.api.cached().locationName, "昆明市 · 五华区");
  assert.equal(next.counts.request, 0);
  next.fail();
  await assert.rejects(next.api.refresh(), /offline/);
  await assert.rejects(next.api.refresh(), /offline/);
  assert.equal(next.counts.request, 1);
  assert.equal(next.api.cached().weatherLabel, "晴 22°C");
  await assert.rejects(next.api.refresh(true), /offline/);
  assert.equal(next.counts.request, 2);
});