import { test } from 'node:test';
import assert from 'node:assert/strict';
import { createStoreBinder } from '../../YouleNexus/assets/framework/ui/store-binder.ts';
import { signal } from '../../YouleNexus/assets/framework/core/reactive.ts';

test('createStoreBinder.bind: 订阅 store 后,值变化时 callback 触发', () => {
  const store = signal({ name: 'init' });
  const b = createStoreBinder();
  let got: string | null = null;
  b.bind(store, 'state', (s) => { got = s.name; });
  assert.equal(got, 'init', '首次同步调用一次');
  store.value = { name: 'changed' };
  assert.equal(got, 'changed');
});

test('createStoreBinder.bind: 不同 slot 独立', () => {
  const store1 = signal(1);
  const store2 = signal('x');
  const b = createStoreBinder();
  const got: Array<number | string> = [];
  b.bind(store1, 'a', (v) => got.push(v));
  b.bind(store2, 'b', (v) => got.push(v));
  assert.deepEqual(got, [1, 'x']);
  got.length = 0;
  store1.value = 2;
  assert.deepEqual(got, [2]);
});

test('createStoreBinder.unbindAll: 退订后 store 变化不再触发 callback', () => {
  const store = signal({ x: 0 });
  const b = createStoreBinder();
  let count = 0;
  b.bind(store, 'state', () => { count++; });
  assert.equal(count, 1);
  store.value = { x: 1 };
  assert.equal(count, 2);
  b.unbindAll();
  store.value = { x: 2 };
  assert.equal(count, 2, '退订后不再触发');
});

test('createStoreBinder: 多次 bind 的 unbindAll 全部退订', () => {
  const a = signal(1);
  const b = signal(2);
  const binder = createStoreBinder();
  let na = 0, nb = 0;
  binder.bind(a, 'a', () => na++);
  binder.bind(b, 'b', () => nb++);
  assert.equal(na, 1);
  assert.equal(nb, 1);
  binder.unbindAll();
  a.value = 10;
  b.value = 20;
  assert.equal(na, 1);
  assert.equal(nb, 1);
});

test('createStoreBinder: bind 同一 store 多次,各 callback 都触发', () => {
  const store = signal(0);
  const b = createStoreBinder();
  let a = 0, b2 = 0;
  b.bind(store, 'x', () => a++);
  b.bind(store, 'y', () => b2++);
  assert.equal(a, 1);
  assert.equal(b2, 1);
  store.value = 1;
  assert.equal(a, 2);
  assert.equal(b2, 2);
});

test('createStoreBinder.unbindAll: 重复调用安全(幂等)', () => {
  const store = signal(0);
  const b = createStoreBinder();
  let n = 0;
  b.bind(store, 's', () => n++);
  b.unbindAll();
  b.unbindAll(); // 不抛错
  store.value = 1;
  assert.equal(n, 1);
});

test('createStoreBinder.bind: callback 抛错不影响其它订阅者与下次 bind', () => {
  const store = signal(0);
  const b = createStoreBinder();
  let reached = false;
  b.bind(store, 'a', () => { throw new Error('boom'); });
  b.bind(store, 'b', () => { reached = true; });
  // 首次同步调用 + 第二次同步触发都不会让 binder 崩溃
  assert.equal(reached, true);
  store.value = 1;
  assert.equal(reached, true);
});