// 序号生成方式
export const snGenerationMethodList = [
  { value: 'recalculate', label: '重新计算' },
  { value: 'follow', label: '跟随上题' },
];

// 查看方式
export const viewMethodList = [
  { value: 'independent', label: '独立排放' },
  { value: 'list', label: '播放列表' },
];

// 序号类型
export const serialNumberTypeList = [
  { value: 'number', label: '数字' },
  { value: 'bracket_number', label: '括号数字' },
  { value: 'letter', label: '字母' },
  { value: 'capital', label: '大写字母' },
];

// 序号位置
export const serialNumberPositionList = [
  { value: 'top-start', justifyContent: 'flex-start' },
  { value: 'top', justifyContent: 'center' },
  { value: 'top-end', justifyContent: 'flex-end' },
  { value: 'left-start', justifyContent: 'flex-start' },
  { value: 'left', justifyContent: 'center' },
  { value: 'left-end', justifyContent: 'flex-end' },
  { value: 'right-start', justifyContent: 'flex-start' },
  { value: 'right', justifyContent: 'center' },
  { value: 'right-end', justifyContent: 'flex-end' },
  { value: 'bottom-start', justifyContent: 'flex-start' },
  { value: 'bottom', justifyContent: 'center' },
  { value: 'bottom-end', justifyContent: 'flex-end' },
];

// 拼音位置
export const pinyinPositionList = [
  { value: 'top', label: '上' },
  { value: 'bottom', label: '下' },
];

// 排列方式
export const arrangeTypeList = [
  { value: 'horizontal', label: '横排' },
  { value: 'vertical', label: '竖排' },
];

/**
 * 判断序号类型
 * @param {string} str
 */
export function checkString(str) {
  const number = /^\d/.test(str); // 判断是否包含数字
  const letter = /^[a-z]/.test(str); // 判断是否包含字母
  const capital = /^[A-Z]/.test(str); // 判断是否包含大写字母
  const bracket_number = /\(\d+\)/.test(str); // 判断是否包含括号数字，例如 (123)
  const obj = { number, letter, capital, bracket_number };
  let strType = Object.keys(obj).find((key) => obj[key]);
  return strType;
}

// 计算选项方法
export const computeOptionMethods = {
  [serialNumberTypeList[0].value]: (i) => `${i + 1}`,
  [serialNumberTypeList[1].value]: (i) => `(${i + 1})`,
  [serialNumberTypeList[2].value]: (i) => `${String.fromCharCode(97 + i)}`, // 小写
  [serialNumberTypeList[3].value]: (i) => `${String.fromCharCode(65 + i)}`, // 大写
};

// 反向计算选项方法
export const reversedComputeOptionMethods = {
  [serialNumberTypeList[0].value]: (i) => Number(i),
  [serialNumberTypeList[1].value]: (i) => Number(i.replace('(', '').replace(')', '')),
  [serialNumberTypeList[2].value]: (i) => i.charCodeAt(0) - 97 + 1, // 小写
  [serialNumberTypeList[3].value]: (i) => i.charCodeAt(0) - 65 + 1,
};

/**
 * 改变选项序号
 * @param {object} property 选项属性
 */
export function switchSerialNumber(property) {
  let relNum = 1;
  const reversedComputationMethod = reversedComputeOptionMethods[property.sn_type];
  if (reversedComputationMethod) {
    relNum = reversedComputationMethod(property.serial_number);
  }

  let index = serialNumberTypeList.findIndex((p) => p.value === property.sn_type);
  property.sn_type = serialNumberTypeList[index + 1]?.value || serialNumberTypeList[0].value;
  const computationMethod = computeOptionMethods[property.sn_type];
  if (computationMethod) {
    property.serial_number = computationMethod(relNum - 1);
  }
}

/**
 * 计算选项序号
 * @param {Number} i 序号
 * @param {String} sn_type 选项类型
 * @returns String 题号
 */
export function computedSerialNumber(i, sn_type) {
  const computationMethod = computeOptionMethods[sn_type];
  if (computationMethod) {
    return computationMethod(i);
  }
  return '';
}