require 'identification/document'
require 'identification/parser/dvla'

module Identification
  # Represents a UK DVLA-issued Drivers License.
  class DVLA < Document
    attr_accessor :driver_number, :first_initials, :license_numbers

    # Creates an instance of a drivers license.
    # Will automatically parse if the drivers number is given, and will automatically generate if all necessary fields are set.
    #
    # @param [Hash] details of the paramaters
    # @option opts [String] :driver_number 18 digit driver number, section 5 on a drivers license of the individual (only set for parsing)
    # @option opts [String] :first_initials first initials of the individual (only set for generating)
    # @option opts [String] :last_name surname of the individual - this will be abridged to the first 5 letters only (only set for generating)
    # @option opts [String] :date_of_birth date of birth of the individual (only set for generating)
    # @option opts [String] :gender gender of the individual stored as M or F (only set for generating)
    # @option opts [String] :license_numbers license number of the passport (only set for generating)
    def initialize(params = {})
      super(params)
      @driver_number = params[:driver_number]
      @first_initials = params[:first_initials]
      @license_numbers = params[:license_numbers]
      parse if params.key?(:driver_number)
    end

    # Parses MRZs and updates the instance variables.
    # Returns true if it was successfuly parsed, false if there was an issue.
    #
    # @return [Boolean] whether the passport is valid or not.
    # @raise [RuntimeError] if there is no MRZ set in the instance.
    def parse
      if !@driver_number.nil?
        result = Parser::DVLA.parse(@driver_number)
        @last_name = result[:last_name] if result.key?(:last_name)
        @first_initials = result[:first_initials] if result.key?(:first_initials)
        @date_of_birth = result[:date_of_birth] if result.key?(:date_of_birth)
        @license_numbers = result[:license_numbers] if result.key?(:license_numbers)
        @gender = result[:gender] if result.key?(:gender)
        @validity = result[:validity]
        return true if @validity
      else
        fail 'No drivers number set to parse.'
      end

      false
    end
  end
end