const Parameter = require('parameter')

const p = new Parameter()

// custom checker to check from field
p.addRule('from', function(rule, value) {
  if (typeof value === 'string') {
    return Parameter.TYPE_MAP.email.call(this, { allowEmpty: false }, value)
  } else if (typeof value === 'object') {
    const objectRule = {
      name: {
        type: 'string',
        required: true,
      },
      email: {
        type: 'email',
        required: true,
      },
    }
    return Parameter.TYPE_MAP.object.call(this, { rule: objectRule }, value)
  } else {
    return this.t('should provide a string or object')
  }
})

// custom checker to check to field
p.addRule('to', function(rule, value) {
  const objectRule = {
    email: {
      type: 'email',
      required: true,
    },
  }
  if (typeof value === 'string') {
    return Parameter.TYPE_MAP.email.call(this, { allowEmpty: false }, value)
  } else if (Object.prototype.toString.call(value) === '[object Object]') {
    return Parameter.TYPE_MAP.object.call(this, { rule: objectRule }, value)
  } else if (Array.isArray(value)) {
    const aryRule = {
      itemType: 'to',
    }
    return Parameter.TYPE_MAP.array.call(this, aryRule, value)
  } else {
    return this.t('should provide a string or an array')
  }
})

// ps. parameter only support validate an object(can not be an array)
const rule = {
  subject: 'string',
  from: 'from',
  to: 'to',
  data: 'object',
  id: 'string',
}