/**
 * 表单验证工具函数
 */

/**
 * 验证手机号
 * @param {string} phone - 手机号
 * @returns {boolean}
 */
export function isPhone(phone) {
  if (!phone) return false
  const reg = /^1[3-9]\d{9}$/
  return reg.test(phone)
}

/**
 * 验证邮箱
 * @param {string} email - 邮箱
 * @returns {boolean}
 */
export function isEmail(email) {
  if (!email) return false
  const reg = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/
  return reg.test(email)
}

/**
 * 验证身份证号
 * @param {string} idCard - 身份证号
 * @returns {boolean}
 */
export function isIdCard(idCard) {
  if (!idCard) return false
  const reg = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/
  return reg.test(idCard)
}

/**
 * 验证是否为空
 * @param {*} value - 值
 * @returns {boolean}
 */
export function isEmpty(value) {
  if (value === null || value === undefined) return true
  if (typeof value === 'string') return value.trim() === ''
  if (Array.isArray(value)) return value.length === 0
  if (typeof value === 'object') return Object.keys(value).length === 0
  return false
}

/**
 * 验证是否为数字
 * @param {*} value - 值
 * @returns {boolean}
 */
export function isNumber(value) {
  return !isNaN(parseFloat(value)) && isFinite(value)
}

/**
 * 验证是否为正整数
 * @param {*} value - 值
 * @returns {boolean}
 */
export function isPositiveInteger(value) {
  const reg = /^[1-9]\d*$/
  return reg.test(String(value))
}

/**
 * 验证字符串长度
 * @param {string} str - 字符串
 * @param {number} min - 最小长度
 * @param {number} max - 最大长度
 * @returns {boolean}
 */
export function isLengthBetween(str, min, max) {
  if (!str) return min === 0
  const len = str.length
  return len >= min && len <= max
}

/**
 * 验证中文姓名
 * @param {string} name - 姓名
 * @returns {boolean}
 */
export function isChineseName(name) {
  if (!name) return false
  const reg = /^[\u4e00-\u9fa5]{2,10}$/
  return reg.test(name)
}

/**
 * 验证URL
 * @param {string} url - URL
 * @returns {boolean}
 */
export function isUrl(url) {
  if (!url) return false
  const reg = /^(https?:\/\/)?([\da-z.-]+)\.([a-z.]{2,6})([/\w .-]*)*\/?$/
  return reg.test(url)
}

/**
 * 表单验证器
 * @param {Object} rules - 验证规则
 * @param {Object} data - 表单数据
 * @returns {{valid: boolean, errors: Object}}
 */
export function validate(rules, data) {
  const errors = {}
  let valid = true
  
  for (const field in rules) {
    const fieldRules = rules[field]
    const value = data[field]
    
    for (const rule of fieldRules) {
      // 必填验证
      if (rule.required && isEmpty(value)) {
        errors[field] = rule.message || `${field}不能为空`
        valid = false
        break
      }
      
      // 手机号验证
      if (rule.type === 'phone' && !isEmpty(value) && !isPhone(value)) {
        errors[field] = rule.message || '请输入正确的手机号'
        valid = false
        break
      }
      
      // 邮箱验证
      if (rule.type === 'email' && !isEmpty(value) && !isEmail(value)) {
        errors[field] = rule.message || '请输入正确的邮箱'
        valid = false
        break
      }
      
      // 长度验证
      if (rule.min !== undefined || rule.max !== undefined) {
        const len = value ? String(value).length : 0
        if (rule.min !== undefined && len < rule.min) {
          errors[field] = rule.message || `长度不能少于${rule.min}个字符`
          valid = false
          break
        }
        if (rule.max !== undefined && len > rule.max) {
          errors[field] = rule.message || `长度不能超过${rule.max}个字符`
          valid = false
          break
        }
      }
      
      // 自定义验证
      if (rule.validator && typeof rule.validator === 'function') {
        const result = rule.validator(value, data)
        if (result !== true) {
          errors[field] = result || rule.message || '验证失败'
          valid = false
          break
        }
      }
    }
  }
  
  return { valid, errors }
}

/**
 * 显示验证错误提示
 * @param {Object} errors - 错误对象
 */
export function showValidateError(errors) {
  const firstError = Object.values(errors)[0]
  if (firstError) {
    uni.showToast({
      title: firstError,
      icon: 'none'
    })
  }
}

export default {
  isPhone,
  isEmail,
  isIdCard,
  isEmpty,
  isNumber,
  isPositiveInteger,
  isLengthBetween,
  isChineseName,
  isUrl,
  validate,
  showValidateError
}