class Admins::ImportUserService < ApplicationService
  Error = Class.new(StandardError)

  attr_reader :file, :result
  attr_accessor :school, :department

  def initialize(file)
    @file   = file
    @result = { success: 0, fail: [] }
  end

  def call
    raise Error, '文件不存在' if file.blank?

    excel = Admins::ImportUserExcel.new(file)
    excel.read_each(&method(:save_user))

    result
  rescue ApplicationImport::Error => ex
    raise Error, ex.message
  end

  private

  def save_user(data)
    ActiveRecord::Base.transaction do
      if school.blank? || school.name != data.school
        @school = School.find_or_create_by!(name: data.school)
      end
      if department.blank? || department.school_id != school.id || department.name != data.department
        @department = school.departments.find_or_initialize_by(name: data.department)
        @department.is_auth = true
        @department.save!
      end

      user =
        if data.phone && data.mail
          User.find_by(phone: data.phone, mail: data.mail)
        elsif data.phone && data.mail.blank?
          User.find_by(phone: data.phone)
        elsif data.phone.blank? && data.mail
          User.find_by(mail: data.mail)
        elsif
          User.joins(:user_extension).where(user_extensions: { student_id: data.student_id }).first
        end

      user ||= User.new

      attrs = {
        type: 'User',
        status: User::STATUS_ACTIVE,
        login: user.login.presence || data.student_id || User.generate_login,
        firstname: '',
        lastname: data.name,
        nickname: data.name,
        password: '12345678',
        professional_certification: 1,
        certification: 1,
        phone: data.phone,
        mail: data.mail,
        profile_completed: true,
      }
      user.assign_attributes(attrs)
      user.save!

      identity = data.identity.present? ? data.identity.to_i : 2

      extension_attrs = {
        school_id: school.id, location: school.province, location_city: school.city,
        gender: 0, identity: identity, department_id: department.id, student_id: data.student_id.presence
      }
      extension = user.user_extension || user.build_user_extension
      extension.assign_attributes(extension_attrs)
      extension.save!
    end

    result[:success] += 1
  rescue Exception => ex
    fail_data = data.as_json
    fail_data[:data] = fail_data.values.join('，')
    fail_data[:message] = ex.message

    result[:fail] << fail_data
  end
end