require 'identification/document'
require 'identification/parser/passport'

module Identification
  # Represents a passport with an MRZ or fields that create an MRZ.
  class Passport < Document
    attr_accessor :mrz_line_1, :mrz_line_2, :issuing_state, :first_names, :passport_number, :nationality, :expiry_date, :personal_number

    # Creates an instance of a passport.
    # Will automatically parse if both MRZ lines are given, and will automatically generate if all necessary fields are set.
    # (all except personal number which is rarely used)
    #
    # @param [Hash] details of the paramaters
    # @option opts [String] :mrz_line_1 first line of the machine readable zone (only set for parsing)
    # @option opts [String] :mrz_line_2 second line of the machine readable zone (only set for parsing)
    # @option opts [String] :issuing_state : issuing state of the individual's passport (only set for generating)
    # @option opts [String] :first_names : array of first names on the passport (only set for generating)
    # @option opts [String] :last_name surname of the individual (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 (only set for generating)
    # @option opts [String] :passport_number : passport number of the individual (only set for generating)
    # @option opts [String] :nationality : nationality of the individual (only set for generating)
    # @option opts [String] :expiry_date : expiry date of the passport, given as a date object (only set for generating)
    # @option opts [String] :personal_number : personal number of the individual - optional (only set for generating)
    def initialize(params = {})
      super(params)
      @mrz_line_1 = params[:mrz_line_1]
      @mrz_line_2 = params[:mrz_line_2]
      @issuing_state = params[:issuing_state]
      @first_names = params[:first_names]
      @passport_number = params[:passport_number]
      @nationality = params[:nationality]
      @expiry_date = params[:expiry_date]
      @personal_number = params[:personal_number]

      parse if params.key?(:mrz_line_1) && params.key?(:mrz_line_2)
    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 !@mrz_line_1.nil? && !@mrz_line_2.nil?
        result = Parser::Passport.parse(@mrz_line_1, @mrz_line_2)
        @issuing_state = result[:issuing_state] if result.key?(:issuing_state)
        @last_name = result[:last_name] if result.key?(:last_name)
        @first_names = result[:first_names] if result.key?(:first_names)
        @passport_number = result[:passport_number] if result.key?(:passport_number)
        @nationality = result[:nationality] if result.key?(:nationality)
        @date_of_birth = result[:date_of_birth] if result.key?(:date_of_birth)
        @gender = result[:gender] if result.key?(:gender)
        @expiry_date = result[:expiry_date] if result.key?(:expiry_date)
        @personal_number = result[:personal_number] if result.key?(:personal_number)
        @validity = result[:validity]
        return true if @validity
      else
        fail 'No MRZ set to parse.'
      end

      false
    end
  end
end