class IdcardInfo

# File lib/idcard_operation/idcard_info.rb, line 5
def initialize(idcard)
  @@dict ||= YAML.safe_load(File.read(File.expand_path('../../../geo_info.yml', __FILE__)))
  @@provinces_standard ||= %w[北京市 天津市 河北省 山西省 内蒙古自治区 辽宁省 吉林省 黑龙江省 上海市 江苏省 浙江省 安徽省 福建省 江西省 山东省 河南省 湖北省 湖南省 广东省 广西壮族自治区 海南省 重庆市 四川省 贵州省 云南省 西藏自治区 陕西省 甘肃省 青海省 宁夏回族自治区 新疆维吾尔自治区 台湾省 香港特别行政区 澳门特别行政区].freeze
  self.idcard = idcard
  self.valid = valid_idcard?
  return unless valid

  self.birthday = calc_birthday
  self.gender = calc_gender
  self.location_raw = @@dict["geoinfo"][idcard[0..5].to_i]
  self.main_location = format_province(location_raw)
end

# File lib/idcard_operation/idcard_info.rb, line 47
def valid_idcard?(idcard_no)
  return false unless /\d{17}([0-9]|x|X)/.match?(idcard_no)
  sysbit(idcard_no).downcase == idcard_no[-1]&.downcase
end

# File lib/idcard_operation/idcard_info.rb, line 66
def office_bit
  %w[1 0 x 9 8 7 6 5 4 3 2]
end

# File lib/idcard_operation/idcard_info.rb, line 54
def sysbit(idcard_no)
  sum = 0
  idcard_no[0..-2].split('').each_with_index do |bit, i|
    sum += bit.to_i * weight(18 - i)
  end
  office_bit.at(sum.divmod(11).last)
end

# File lib/idcard_operation/idcard_info.rb, line 62
def weight(i)
  (2**(i - 1)).divmod(11).last
end

# File lib/idcard_operation/idcard_info.rb, line 31
def calc_birthday
  Date.new(idcard[6..9].to_i, idcard[10..11].to_i, idcard[12..13].to_i)
end

# File lib/idcard_operation/idcard_info.rb, line 27
def calc_gender
  idcard[-2].to_i % 2 == 1 ? "男" : "女"
end

# File lib/idcard_operation/idcard_info.rb, line 18
def format_province(province)
  answer = @@provinces_standard.find do |goal|
    /^#{goal}/.match? province
  end
  return answer unless answer.nil?

  answer || province
end

# File lib/idcard_operation/idcard_info.rb, line 39
def to_hash
  instance_variables.map do |var|
    [var[1..-1].to_sym, instance_variable_get(var)]
  end.to_h
end

# File lib/idcard_operation/idcard_info.rb, line 35
def valid_idcard?
  self.class.valid_idcard?(idcard)
end