# frozen_string_literal: true

require_relative '../../era/western/calendar'

# :nodoc:
module Zakuro
  # :nodoc:
  module Calculation
    # :nodoc:
    module Base
      #
      # Gengou 元号
      #
      class Gengou
        # @return [Western::Calendar] 開始日
        attr_reader :start_date
        # @return [Western::Calendar] 終了日
        attr_reader :last_date
        # @return [Array<LinearGengou>] 1行目元号
        attr_reader :first_line
        # @return [Array<LinearGengou>] 2行目元号
        attr_reader :second_line

        #
        # 初期化
        #
        # @param [Western::Calendar] start_date 開始日
        # @param [Western::Calendar] last_date 終了日
        # @param [Array<LinearGengou>] first_line 1行目元号
        # @param [Array<LinearGengou>] second_line 2行目元号
        #
        def initialize(start_date: Western::Calendar.new, last_date: Western::Calendar.new,
                       first_line: [], second_line: [])
          @start_date = start_date
          @last_date = last_date
          @first_line = first_line
          @second_line = second_line
        end

        #
        # 1行目元号を取得する
        #
        # @param [Western::Calendar] date 西暦日
        #
        # @return [LinearGengou] 1行目元号
        #
        def match_first_line(date: Western::Calendar)
          @first_line.each do |line|
            return line.clone if line.include?(date: date)
          end

          LinearGengou.new
        end

        #
        # 2行目元号を取得する
        #
        # @param [Western::Calendar] date 西暦日
        #
        # @return [LinearGengou] 2行目元号
        #
        def match_second_line(date: Western::Calendar)
          @second_line.each do |line|
            return line.clone if line.include?(date: date)
          end

          LinearGengou.new
        end

        #
        # 元号を取得する
        #
        # @param [String] name 元号名
        #
        # @return [LinearGengou] 元号
        #
        def match_by_name(name:)
          result = match_first_line_by_name(name: name)
          return result unless result.invalid?

          result = match_second_line_by_name(name: name)

          result
        end

        #
        # 1行目元号を取得する
        #
        # @param [String] name 元号名
        #
        # @return [LinearGengou] 1行目元号
        #
        def match_first_line_by_name(name:)
          @first_line.each do |line|
            return line.clone if line.name == name
          end

          LinearGengou.new
        end

        #
        # 2行目元号を取得する
        #
        # @param [String] name 元号名
        #
        # @return [LinearGengou] 2行目元号
        #
        def match_second_line_by_name(name:)
          @second_line.each do |line|
            return line.clone if line.name == name
          end

          LinearGengou.new
        end

        #
        # 不正か
        #
        # @return [True] 不正
        # @return [False] 不正なし
        #
        def invalid?
          @first_line.size.zero? && @second_line.size.zero?
        end
      end
    end
  end
end