class TokyoMetro::App::Renderer::FareTable::ToEachRailwayLine < TokyoMetro::Factory::Decorate::MetaClass

  # @params station_infos_including_other_railway_lines は、駅（全路線）のインスタンスとする。
  # @params railway_line [::RailwayLine]
  def initialize( request , railway_line , station_infos_including_other_railway_lines , starting_station_info , fares , normal_fare_groups )
    super( request )
    @railway_line = railway_line
    @station_infos_including_other_railway_lines = station_infos_including_other_railway_lines
    @starting_station_info = starting_station_info
    @fares = fares
    @normal_fare_groups = normal_fare_groups

    @station_infos_of_railway_line = set_station_infos_of_railway_line
    @id_of_starting_station_info = set_id_of_starting_station_info
  end

  def render
    if @id_of_starting_station_info.present?
      render_when_having_starting_station_info
    else
      render_when_not_having_starting_station_info
    end
  end

  def render_header_of_table
    h_locals_i = {
      request: request ,
      starting_station_info_decorated: @starting_station_info.decorate
    }
    h.render inline: <<-HAML , type: :haml , locals: h_locals_i
%tr{ class: :header }
  %td{ rowspan: 3 , class: [ :station_name_top , :header_bottom ] }<
    - # 出発駅を表示
    %div{ class: [ :starting_station_info , :clearfix ] }
      = starting_station_info_decorated.render_station_code_image( all: true )
      %div{ class: :text }
        = starting_station_info_decorated.render_name_ja_and_en( with_subname: true , suffix_ja: "から" , prefix_en: "From " )
    %div{ class: :arrow }
      = ::TokyoMetro::App::Renderer::Icon.angle_double_down( request ).render
  %td{ colspan: 4 , class: :normal_fare }<
    != "普通運賃"
    %span{ class: [ :small , :text_en ] }<
      = "Normal fare"
%tr{ class: [ :header , :fare_type ] }
  %td{ colspan: 2 , class: :ic_card }<
    != "ICカード利用"
    %span{ class: [ :small , :text_en ] }<
      = "IC card"
  %td{ colspan: 2 , class: :ticket }<
    != "切符"
    %span{ class: [ :small , :text_en ] }<
      = "Ticket"
%tr{ class: :header , class: :fares }
  - [ :ic_card , :ticket ].each do | group |
    %td{ class: [ group , :adult , :header_bottom ] }<
      != "大人"
      %span{ class: [ :small , :text_en ] }<
        = "Adult"
    %td{ class: [ group , :child , :header_bottom ] }<
      != "小児"
      %span{ class: [ :small , :text_en ] }<
        = "Child"
    HAML
  end

  private

  def h_locals
    super.merge({
      this: self ,
      station_infos_including_other_railway_lines: @station_infos_including_other_railway_lines ,
      starting_station_info: @starting_station_info ,
      railway_line: @railway_line ,
      fares: @fares ,
      normal_fare_groups: @normal_fare_groups ,
      id_of_starting_station_info: @id_of_starting_station_info
    }).merge( station_infos_of_railway_line_in_h_locals )
  end

  def render_when_having_starting_station_info
    h.render inline: <<-HAML , type: :haml , locals: h_locals
%table{ class: [ :fare_table , railway_line.css_class_name ] }
  = this.render_header_of_table
  = ::TokyoMetro::App::Renderer::FareTable::ToEachRailwayLine::Rows.new( request , station_infos_of_railway_line_before_starting_station , fares , normal_fare_groups , to_make_empty_row_when_no_station: true ).render
  - #
  %tr<
    = ::Station::Info.find( id_of_starting_station_info ).decorate.render_in_fare_table( starting_station_info: true )
    %td{ class: :starting_station , colspan: 4 }<
      %div{ class: :text_ja }
        = "この駅からの運賃を表示しています"
      %div{ class: :text_en }
        = "Fares from this station are displayed now."
  - #
  = ::TokyoMetro::App::Renderer::FareTable::ToEachRailwayLine::Rows.new( request , station_infos_of_railway_line_after_starting_station , fares , normal_fare_groups ).render
    HAML
  end

  def render_when_not_having_starting_station_info
    h.render inline: <<-HAML , type: :haml , locals: h_locals
%table{ class: [ :fare_table , railway_line.css_class_name ] }
  = this.render_header_of_table
  = ::TokyoMetro::App::Renderer::FareTable::ToEachRailwayLine::Rows.new( request , station_infos_of_railway_line , fares , normal_fare_groups ).render
    HAML
  end

  def set_station_infos_of_railway_line
    @railway_line.station_infos.order( :index_in_railway_line )
  end

  # 路線のインスタンス railway_line に、
  # station_infos_including_other_railway_lines の要素である駅（路線別）が含まれている場合は、その駅の id を返す。
  # 含まれていない場合は、nil を返す。
  # @param stations_of_this_instance 駅（路線）のインスタンス
  # @return [Integer or nil]
  # @note
  def set_id_of_starting_station_info
    ids_of_station_infos = @station_infos_including_other_railway_lines.pluck( :id )
    ids_of_this_railway_line = @railway_line.station_infos.pluck( :id )
    common_station_info_ids = ( ids_of_station_infos & ids_of_this_railway_line )
    if common_station_info_ids.empty?
      nil
    elsif common_station_info_ids.length == 1
      common_station_info_ids.first
    else
      raise "Error"
    end
  end

  def station_infos_of_railway_line_in_h_locals
    if @id_of_starting_station_info.blank?
      { station_infos_of_railway_line: @station_infos_of_railway_line }
    else
      station_infos_of_railway_line_split_by_starting_station
    end

  end

  def station_infos_of_railway_line_split_by_starting_station
    raise "Error" if @id_of_starting_station_info.blank?

    if @station_infos_of_railway_line.first.id == @id_of_starting_station_info
      {
        station_infos_of_railway_line_before_starting_station: nil ,
        station_infos_of_railway_line_after_starting_station: @station_infos_of_railway_line[ 1..(-1) ]
      }

    elsif @station_infos_of_railway_line.last.id == @id_of_starting_station_info
      {
        station_infos_of_railway_line_before_starting_station: @station_infos_of_railway_line[ 0..(-2) ] ,
        station_infos_of_railway_line_after_starting_station: nil
      }

    else
      position_of_starting_station_info = @station_infos_of_railway_line.index { | station_info | station_info.id == @id_of_starting_station_info }
      {
        station_infos_of_railway_line_before_starting_station: @station_infos_of_railway_line[ 0..( position_of_starting_station_info - 1 ) ] ,
        station_infos_of_railway_line_after_starting_station: @station_infos_of_railway_line[ ( position_of_starting_station_info + 1 )..( -1 ) ]
      }
    end
  end

end