const { test } = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const vm = require('node:vm');

function app() {
  const nodes = new Map();
  const node = selector => {
    if (!nodes.has(selector)) nodes.set(selector, {
      value: '', textContent: '', innerHTML: '', disabled: false,
      classList: { add() {}, remove() {}, toggle() {} },
      setAttribute() {}, addEventListener() {}, setCustomValidity() {}, reportValidity() {},
      showModal() { this.open = true; }, close() { this.open = false; },
    });
    return nodes.get(selector);
  };
  const pending = () => new Promise(() => {});
  const context = vm.createContext({
    document: { querySelector: node, querySelectorAll: () => [], addEventListener() {}, documentElement: { dataset: {} } },
    localStorage: { getItem: () => null },
    WeApi: { status: pending, shelf: pending, dashboard: pending, goals: pending },
    crypto: { randomUUID: () => 'test-goal' },
    setTimeout() {}, clearTimeout() {}, console,
  });
  vm.runInContext(fs.readFileSync('static/js/app.js', 'utf8'), context);
  return { context, node, run: code => vm.runInContext(code, context) };
}

test('目标书籍不在当前书架时仍保留总数，并可打开和编辑', () => {
  const { run, node } = app();
  run(`loadState.goals = 'ready';
    books = [{id:'known',title:'已读书',status:'done'}];
    goals = [{id:'g',name:'阅读',start:'2026-09-01',end:'2026-09-30',ids:['known','missing'],sources:[]}];
    shelfData = {};`);
  assert.equal(run('goalMetrics(goals[0]).total'), 2);
  assert.equal(run('goalMetrics(goals[0]).percent'), 50);
  run("openGoalDetail('g'); openGoalEditor('g');");
  assert.match(node('#goal-picker').innerHTML, /状态待同步/);
  assert.equal(run("selectedGoalBooks().includes('missing')"), true);
});

test('数据库保存失败时保留原目标和编辑草稿，允许重试', async () => {
  const { context, run, node } = app();
  run(`loadState.goals = 'ready';
    shelfData = {}; books = [{id:'known',title:'一本书',status:'done'}];
    goals = [{id:'g',name:'原名称',start:'2026-09-01',end:'2026-09-30',ids:['known'],sources:[]}];
    openGoalEditor('g');`);
  node('#goal-name').value = '新名称';
  context.WeApi.saveGoal = async () => { throw new Error('数据库暂不可用'); };
  await run('saveGoal({preventDefault(){}})');
  assert.equal(run('goals[0].name'), '原名称');
  assert.equal(node('#goal-editor').open, true);
  assert.equal(node('#goal-name').value, '新名称');
  assert.match(node('#goal-error').textContent, /数据库暂不可用/);
  context.WeApi.saveGoal = async goal => ({ goal });
  await run('saveGoal({preventDefault(){}})');
  assert.equal(run('goals[0].name'), '新名称');
  assert.equal(node('#goal-editor').open, false);
});

test('目标列表未完成加载时不打开编辑器', () => {
  const { run, node } = app();
  run(`page = 'overview';
    loadState.goals = 'loading';
    shelfData = {};
    books = [{id:'known',title:'一本书',status:'done'}];
    openGoalEditor(null, ['known'], []);`);
  assert.notEqual(node('#goal-editor').open, true);
  assert.equal(run('page'), 'goals');
  assert.match(node('#page-content').innerHTML, /正在读取阅读目标/);
});