Add Curura rankings controller and services

app/controllers/api/v1/curura/rankings_controller.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    module Curura
+      class RankingsController < ApplicationController
+        def index
+          binding.pry
+          set_rankings
+          set_leaderboards
+        end
+
+        private
+
+        def set_rankings
+          @international_rank, @national_rank =
+            RankingCalculator
+              .call(games: games, country: country, score: score)
+              .values_at(:international_rank, :national_rank)
+        end
+
+        def set_leaderboards
+          @best_players, @players_by_country =
+            Curura::Leaderboard.call(games: games).values_at(:best_players, :players_by_country)
+        end
+
+        def games
+          binding.pry
+          @games ||= CururaGame.today
+        end
+
+        def country
+          @country ||= params.require(:country)
+        end
+
+        def score
+          params.require(:score).to_i
+        end
+      end
+    end
+  end
+end

app/services/curura/leaderboard.rb

@@ -0,0 +1,31 @@
+module Curura
+  class Leaderboard
+    class << self
+      def call(games:)
+        @games = games
+
+        { best_players: best_players, players_by_country: players_by_country }
+      end
+
+      private
+
+      def best_players
+        @games
+          .order(score: :desc)
+          .limit(10)
+          .map
+          .with_index(1) { |game, rank| { rank: rank, score: game.score, country: game.country } }
+      end
+
+      def players_by_country
+        @games
+          .group_by(&:country)
+          .transform_values(&:count)
+          .sort_by { |country, count| [-count, country] }
+          .first(10)
+          .map
+          .with_index(1) { |(country, count), rank| { rank: rank, country: country, count: count } }
+      end
+    end
+  end
+end

app/services/curura/ranking_calculator.rb

@@ -0,0 +1,30 @@
+module Curura
+  class RankingCalculator
+    class << self
+      def call(games:, score:, country:)
+        @games = games
+        @score = score
+        @country = country
+
+        { international_rank: international_rank, national_rank: national_rank }
+      end
+
+      private
+
+      def international_rank
+        return "-" if @games.empty?
+
+        position = @games.won_above_score(@score).count.nonzero? || 1
+        "#{position}/#{@games.size}"
+      end
+
+      def national_rank
+        games = @games.country(@country)
+        return "-" if games.empty?
+        position = @games.country(@country).won_above_score(@score).count.nonzero? || 1
+
+        "#{position}/#{games.size}"
+      end
+    end
+  end
+end

app/views/api/v1/curura/rankings/index.json.jbuilder

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+json.national_rank @national_rank
+json.international_rank @international_rank
+json.best_players @best_players
+json.players_by_country @players_by_country

config/routes.rb

@@ -12,6 +12,9 @@
         resources :missing_words, only: %i[index create]
         resources :rankings, only: %i[index]
         resources :sms_forwarders, only: %i[create]
+        namespace :curura do
+          resources :rankings, only: %i[index]
+        end
       end
     end