function isMobile(val) {
  // 正则表达式验证手机号
  const reg = /^1[3-9]\d{9}$/;
  return reg.test(val);
}

function verifyString(str, label, min = 0, max = 100) {
  if (typeof str === 'number') {
    str = str.toString()
  }
  if (str === undefined || str === null) {
    str = ''
  }
  if (typeof str === 'string' && str.trim().length >= min && str.trim().length < max) {
    return [true, str.trim()];
  }
  if (typeof str !== 'string' && min === 0) {
    return [true, ''];
  }
  if (typeof str !== 'string') {
    return [false, `${label}格式不正确`];
  }
  if (str.trim().length === 0 && min > 0) {
    return [false, `${label}不能为空`];
  }
  if (min > 0 && str.trim().length < min) {
    return [false, `${label}不能少于${min}个字符`];
  }
  return [false, `${label}不能超过${max}个字符`]
}

function verifyNumber(value, label, len = 0, min, max, minEq = false, maxEq = false) {
  // 1. 检查 value 是否为字符串或数字类型
  if (typeof value !== 'string' && typeof value !== 'number') {
    return [false, `${label}无效`];
  }

  // 2. 如果是字符串类型，尝试转为数字
  if (typeof value === 'string') {
    // 去除前后空格
    value = value.trim();
    // 空字符串或非数字字符串直接返回 false
    if (value === '' || isNaN(value)) {
      return [false, `${label}无效`];
    }
    value = Number(value);
  }

  // 3. 检查是否为有效数字（排除 NaN 和 Infinity）
  if (typeof value !== 'number' || !isFinite(value)) {
    return [false, `${label}无效`];
  }

  // 4. 检查小数位数是否 <= len
  const decimalPart = String(value).split('.')[1];
  if (decimalPart && decimalPart.length > len) {
    return len === 0 ? [false, `${label}只能输入整数`] : [false, `${label}最多输入${len}位小数`];
  }
  if (typeof min === 'number' && minEq && value < min) {
    return [false, `${label}不能小于${min}`];
  }
  if (typeof min === 'number' && !minEq && value <= min) {
    return [false, `${label}应该大于${min}`];
  }
  if (typeof max === 'number' && maxEq && value > max) {
    return [false, `${label}不能大于${max}`];
  }
  if (typeof max === 'number' && !maxEq && value >= max) {
    return [false, `${label}应该小于${max}`];
  }

  return [true, value];
}

function verifyListItem(val, list, required, label, defaultValue = '') {
  const isEmpty =
    val === undefined ||
    val === null ||
    (typeof val === 'string' && val.trim() === '');
  if (isEmpty && !required) {
    return [true, defaultValue]
  }
  if (list.includes(val)) {
    return [true, val]
  }
  return [false, `${label}无效`]
}

const idTransfer = (sId) => {
  if (sId.length === 15) {
    const arrInt = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2],
      arrCh = ["1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2"];
    let nTemp = 0;

    sId = sId.substr(0, 6) + "19" + sId.substr(6, sId.length - 6);

    for (let i = 0; i < 17; i++) {
      nTemp += Number(sId.substr(i, 1)) * arrInt[i];
    }
    sId += arrCh[nTemp % 11];
  }
  return sId;
};

function isChinaId(s) {
  const sId = idTransfer(s),
    aCity = {
      11: "北京",
      12: "天津",
      13: "河北",
      14: "山西",
      15: "内蒙古",
      21: "辽宁",
      22: "吉林",
      23: "黑龙江 ",
      31: "上海",
      32: "江苏",
      33: "浙江",
      34: "安徽",
      35: "福建",
      36: "江西",
      37: "山东",
      41: "河南",
      42: "湖北 ",
      43: "湖南",
      44: "广东",
      45: "广西",
      46: "海南",
      50: "重庆",
      51: "四川",
      52: "贵州",
      53: "云南",
      54: "西藏 ",
      61: "陕西",
      62: "甘肃",
      63: "青海",
      64: "宁夏",
      65: "新疆",
      71: "台湾",
      81: "香港",
      82: "澳门",
      91: "国外 ",
    };
  if (!/^\d{17}(\d|x)$/i.test(sId)) {
    return false;
  }

  if (!aCity[parseInt(sId.substr(0, 2), 10)]) {
    return false
  }

  if (sId.length == 18) {
    //∑(ai×Wi)(mod 11)
    //加权因子
    const factor = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
    //校验位
    const parity = [1, 0, "X", 9, 8, 7, 6, 5, 4, 3, 2];
    let sum = 0;
    let ai = 0;
    let wi = 0;
    for (let i = 0; i < 17; i++) {
      ai = Number(sId[i]);
      wi = factor[i];
      sum += ai * wi;
    }
    const last = parity[sum % 11];
    if (last != sId[17].toUpperCase()) {
      return false;
    }
  }

  return true
}

module.exports = {
  verifyString,
  verifyNumber,
  verifyListItem,
  isMobile,
  isChinaId
}