pulibrary / orangelight / 0e37073d-109c-440c-949f-49d2aa86311b

class Orangelight::BrowsablesController < ApplicationController

  def index

    assign_values

    if !((@last_id - @rpp + 1)..@last_id).cover?(@start) && @is_last

      @start = @last_id - @rpp + 1

      @start = 1 if @start < 1 # catch for start ids higher than last id

    end

    assign_pagination_values

    @facet = facet

    @list_name = list_name

    respond_to do |format|

      format.html # index.html.erb

      format.json { render json: @orangelight_browsables }

    end

  end

  private

    def assign_values

      @model = model_table_name

      @rpp = rpp

      @page_link = page_link

      @start = first_model_id

      populate_search_results

      @last_id = last_model_id

      @is_last = (@last_id - @rpp + 1) <= @start

    end

    def rpp

      if rpp_param.nil?

        50

      else

        validate_rpp(requested_rpp)

      end

    end

    def page_link

      if rpp_param.nil?

        '?'

      else

        size = validate_rpp(requested_rpp)

        "?rpp=#{size}&"

      end

    end

    def validate_rpp(size)

      rpp_range = [10, 25, 50, 100]

      if rpp_range.include? size

        size

      else

        50

      end

    end

    def populate_search_results

      return if query_param.nil?

      search_result = if vocabulary_search_on_facet == 'subject_facet'

                        model_param.where('sort <= ?', search_term).order('sort').last

                      else

                        model_param.where(sort: search_term).where(vocabulary: vocabulary_search_on_facet).first

                      end

      return if search_result.nil?

      populate_search_params(search_result)

    end

    def populate_search_params(search_result)

      @search_result = search_result.label

      @search_term = search_term

      @exact_match = search_term == search_result.sort

      @match = search_result.id

      @match_vocabulary = search_result.vocabulary if @model == 'subjects'

      @start = search_result.id - 1

      @start -= 1 if @exact_match

      @start = 1 if @start < 1

      @query = query_param

    end

    def assign_pagination_values

      @is_first = @start == 1

      @page_last = if (@start + @rpp - 1) > @last_id

                     @last_id

                   else

                     @start + @rpp - 1

                   end

      @prev = @start - @rpp

      @prev = 1 if @prev < 1

      @next = @start + @rpp

      @orangelight_browsables = model_param.where(id: @start..@page_last)

    end

    def facet

      if browsing_names?

        'author_s'

      elsif browsing_subjects?

        vocab_param

      elsif browsing_titles?

        'name_title_browse_s'

      end

    end

    def model_param

      params[:model]

    end

    def vocab_param

      params[:vocab]

    end

    def vocabulary_search_on_facet

      vocab_types = {

        'Library of Congress subject heading' => 'lc_subject_facet',

        'Library of Congress genre/form terms for library and archival materials' => 'lcgft_genre_facet',

        'Art & architecture thesaurus' => 'aat_genre_facet',

        'Homosaurus terms' => 'homoit_subject_facet',

        'Homosaurus genres' => 'homoit_genre_facet',

        'Rare books genre term' => 'rbgenr_genre_facet',

        'Chinese traditional subjects' => 'siku_subject_facet',

        'Locally assigned term' => 'local_subject_facet'

      }

      vocab_types_invert = vocab_types.invert

      vocab_types_invert.fetch(vocab_param, 'subject_facet')

    end

    def model_table_name

      model_name = model_param.name

      model_class = model_name.demodulize

      model_class.tableize

    end

    def browsing_call_numbers?

      model_table_name == 'call_numbers'

    end

    def browsing_names?

      model_table_name == 'names'

    end

    def browsing_subjects?

      model_table_name == 'subjects'

    end

    def browsing_titles?

      model_table_name == 'name_titles'

    end

    def list_name

      value = model_table_name.humanize

      return 'author-title headings' if value == 'Name titles'

      value

    end

    def id_param

      params[:id]

    end

    def query_param

      params[:q]

    end

    def start_param

      params[:start]

    end

    def first_model_id

      return 1 if start_param.nil?

      start_param.to_i

    end

    def search_term

      return StringFunctions.cn_normalize(query_param) if browsing_call_numbers?

      query_param.normalize_em

    end

    def last_model_id

      return model_param.last.id if model_param.last

      1

    end

    def rpp_param

      params[:rpp]

    end

    def requested_rpp

      rpp_param.to_i

    end

    def set_orangelight_browsable

      @orangelight_browsable = model_param.find(id_param) if model_param

    end

    def orangelight_browsable_params

      params.require(:orangelight_browsable).permit(:model, :id)

    end

end