'use strict';

const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');
const vm = require('node:vm');

/**
 * @param {string} source - 页面源码
 * @param {string} name - 函数名
 * @returns {string} 可独立执行的函数源码
 */
function extractFunction(source, name) {
  const pattern = new RegExp('function ' + name + '\\(');
  const match = pattern.exec(source);
  assert.ok(match, '缺少方法 ' + name);
  const end = source.indexOf('\n/**', match.index + match[0].length);
  return source.slice(match.index, end < 0 ? source.length : end);
}

const sourcePath = path.resolve(__dirname, '../src/timecard-repair.oyd.jsx');
const source = fs.readFileSync(sourcePath, 'utf8');
const methods = vm.runInNewContext(
  ['toTwoDigitText', 'resolveRepairMonth']
    .map((name) => extractFunction(source, name)).join('\n')
    + '\n({resolveRepairMonth})',
);

assert.deepEqual(
  { ...methods.resolveRepairMonth('', new Date(2026, 9, 21)) },
  { year: 2026, month: 9 },
  '未传月份时应默认上一个月',
);
assert.deepEqual(
  { ...methods.resolveRepairMonth('202610', new Date(2026, 9, 21)) },
  { year: 2026, month: 9 },
  '传入当前月时应回退到上一个月',
);
assert.deepEqual(
  { ...methods.resolveRepairMonth('202608', new Date(2026, 9, 21)) },
  { year: 2026, month: 8 },
  '显式历史月份应保持不变',
);
assert.deepEqual(
  { ...methods.resolveRepairMonth('202701', new Date(2027, 0, 10)) },
  { year: 2026, month: 12 },
  '一月份回退时应正确跨年',
);

console.log('PASS 补填页面默认月份解析');