【チャレンジ課題】電気料金を返すAPIの実装 monakam01

serverside_challenge_2/challenge/.rubocop.yml

@@ -0,0 +1,10 @@
+Documentation:
+  Enabled: false
+MethodLength:
+  CountComments: true 
+  Max: 25 
+  Style/FrozenStringLiteralComment:
+  Enabled: false
+Metrics:
+  Enabled: false
+

serverside_challenge_2/challenge/Gemfile

@@ -36,6 +36,9 @@ gem "bootsnap", require: false
 # Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin AJAX possible
 # gem "rack-cors"
 
+gem "active_hash"
+gem 'rubocop-rails', '~> 2.32'
+
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri mingw x64_mingw ]

serverside_challenge_2/challenge/Gemfile.lock

@@ -46,6 +46,8 @@ GEM
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    active_hash (3.3.1)
+      activesupport (>= 5.0.0)
     activejob (7.0.8)
       activesupport (= 7.0.8)
       globalid (>= 0.3.6)
@@ -66,6 +68,7 @@ GEM
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
       tzinfo (~> 2.0)
+    ast (2.4.3)
     bootsnap (1.18.3)
       msgpack (~> 1.2)
     builder (3.2.4)
@@ -84,6 +87,9 @@ GEM
     irb (1.11.2)
       rdoc
       reline (>= 0.4.2)
+    json (2.13.0)
+    language_server-protocol (3.17.0.5)
+    lint_roller (1.1.0)
     loofah (2.22.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -111,7 +117,12 @@ GEM
       racc (~> 1.4)
     nokogiri (1.16.2-x86_64-linux)
       racc (~> 1.4)
+    parallel (1.27.0)
+    parser (3.3.8.0)
+      ast (~> 2.4.1)
+      racc
     pg (1.5.4)
+    prism (1.4.0)
     psych (5.1.2)
       stringio
     puma (5.6.8)
@@ -148,16 +159,42 @@ GEM
       rake (>= 12.2)
       thor (~> 1.0)
       zeitwerk (~> 2.5)
+    rainbow (3.1.1)
     rake (13.1.0)
     rdoc (6.6.2)
       psych (>= 4.0.0)
+    regexp_parser (2.10.0)
     reline (0.4.2)
       io-console (~> 0.5)
+    rubocop (1.78.0)
+      json (~> 2.3)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.1.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 2.9.3, < 3.0)
+      rubocop-ast (>= 1.45.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 4.0)
+    rubocop-ast (1.46.0)
+      parser (>= 3.3.7.2)
+      prism (~> 1.4)
+    rubocop-rails (2.32.0)
+      activesupport (>= 4.2.0)
+      lint_roller (~> 1.1)
+      rack (>= 1.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.44.0, < 2.0)
+    ruby-progressbar (1.13.0)
     stringio (3.1.0)
     thor (1.3.0)
     timeout (0.4.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    unicode-display_width (3.1.4)
+      unicode-emoji (~> 4.0, >= 4.0.4)
+    unicode-emoji (4.0.4)
     websocket-driver (0.7.6)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
@@ -168,11 +205,13 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
+  active_hash
   bootsnap
   debug
   pg (~> 1.1)
   puma (~> 5.0)
   rails (~> 7.0.8)
+  rubocop-rails (~> 2.32)
   tzinfo-data
 
 RUBY VERSION

serverside_challenge_2/challenge/app/controllers/api/v1/power_supply_plan_controller.rb

@@ -0,0 +1,121 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    class PowerSupplyPlanController < ApplicationController
+      def simulate_all
+        amp = params[:amp]
+        meter_rate = params[:meter_rate]
+        bad_request_result = build_200_message(amp, meter_rate)
+        return render json: bad_request_result, status: 400 if bad_request_result.present?
+
+        amp = amp.to_i
+        meter_rate = meter_rate.to_i
+        plans = PowerSupplyPlan.all
+        result = []
+        plans.each do |plan|
+          basic_charge = plan.basic_charges.where(amp: amp)
+          next if basic_charge.blank?
+
+          meter_charge_price = meter_charge(plan, meter_rate)
+          next if meter_charge_price.negative?
+
+          result << {
+            provider_name: plan.provider.name,
+            plan_name: plan.name.to_s,
+            price: (basic_charge.first.price.to_f + meter_charge_price).floor(0).to_i
+          }
+        end
+        render json: result
+      end
+
+      private
+
+      def meter_charge(plan, meter_rate)
+        price = 0
+        plan.meter_rate_charges.each do |step|
+          price += calculate_if_step_applicable(step, meter_rate)
+        end
+        price
+      end
+
+      def calculate_if_step_applicable(step, meter_rate)
+        max_rate = step.max_meter_rate
+        min_rate = step.min_meter_rate
+        price = step.price
+
+
+        # 最小ステップ かつ 最大ステップ(従量料金設定が１ステップのみのケース)
+        return meter_rate * price if min_rate.zero? && max_rate.nil?
+
+        # 使用量がステップ請求額に満たない場合0を返す
+        return 0 if meter_rate < min_rate
+        if max_rate.nil? && min_rate <= meter_rate
+          # 最大料金ステップの計算
+          return (meter_rate - min_rate + 1) * price
+        end
+
+        if min_rate.zero?
+          # 最小料金ステップの計算
+          if max_rate <= meter_rate
+            # 該当ステップの満額請求計算
+            max_rate * price
+          else
+            # 該当ステップの使用量までを計算
+            meter_rate * price
+          end
+        elsif (min_rate..max_rate).include?(meter_rate)
+          # 中間料金ステップの計算
+          # 該当ステップの使用量までを計算
+          (meter_rate - min_rate + 1) * price
+        else
+          # 該当ステップの満額請求計算
+          (max_rate - min_rate + 1) * price
+        end
+      end
+
+      def build_200_message(amp, meter_rate)
+        message = ''
+        if amp.blank?
+          message += "リクエストパラメータ 'amp' が不足しています。\n"
+        else
+          unless valid_amp?(amp)
+            message += "リクエストパラメータ 'amp' の値が不正です。'10 / 15 / 20 / 30 / 40 / 50 / 60' のいずれかの値を指定してください。\n"
+          end
+        end
+        if meter_rate.blank?
+          message += "リクエストパラメータ 'meter_rate' が不足しています。\n"
+        else
+          unless numeric?(meter_rate) && meter_rate.to_i >= 0
+            message += "リクエストパラメータ 'meter_rate' の値が不正です。0以上の整数を指定してください。\n"
+          end
+        end
+        return errro_result(message) if message.present?
+
+        []
+      end
+
+      def numeric?(string)
+        Integer(string)
+        true
+      rescue ArgumentError, TypeError
+        false
+      end
+
+      def valid_amp?(amp)
+        [10, 15, 20, 30, 40, 50, 60].include?(amp.to_i)
+      end
+
+      def errro_result(result)
+        [
+          {
+            error: {
+              code: 400,
+              message: result
+            }
+          }
+        ]
+      end
+    end
+  end
+end

serverside_challenge_2/challenge/app/models/basic_charge.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class BasicCharge < ApplicationRecord
+  belongs_to :power_supply_plan
+end

serverside_challenge_2/challenge/app/models/meter_rate_charge.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class MeterRateCharge < ApplicationRecord
+  belongs_to :power_supply_plan
+end

serverside_challenge_2/challenge/app/models/power_supply_plan.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class PowerSupplyPlan < ApplicationRecord
+  belongs_to :provider
+  has_many :meter_rate_charges
+  has_many :basic_charges
+end

serverside_challenge_2/challenge/app/models/provider.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class Provider < ApplicationRecord
+  has_many :power_supply_plans
+end

serverside_challenge_2/challenge/config/credentials.yml.enc

@@ -1 +1 @@
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serverside_challenge_2/challenge/config/routes.rb

@@ -3,4 +3,9 @@
 
   # Defines the root path route ("/")
   # root "articles#index"
+  namespace :api do
+    namespace :v1 do
+      post "simulate_all_plan", to: "power_supply_plan#simulate_all"
+    end
+  end
 end

serverside_challenge_2/challenge/db/migrate/20250723134304_create_basic_charges.rb

@@ -0,0 +1,34 @@
+class CreateBasicCharges < ActiveRecord::Migration[7.0]
+  def change
+    create_table :providers do |t|
+      t.string :provider_name, :null => false
+      t.string :rounding_amount_method, :null => false
+
+      t.timestamps
+    end
+
+    create_table :power_supply_plans do |t|
+      t.belongs_to :provider
+      t.string :plan_name, :null => false
+
+      t.timestamps
+    end
+
+    create_table :meter_rate_charges do |t|
+      t.belongs_to :power_supply_plan
+      t.integer :min_meter_rate, :null => false
+      t.integer :max_meter_rate
+      t.decimal :price, precision: 6, scale: 2, :null => false
+
+      t.timestamps
+    end
+
+    create_table :basic_charges do |t|
+      t.belongs_to :power_supply_plan 
+      t.integer :amp, :null => false
+      t.decimal :price, precision: 6, scale: 2, :null => false
+
+      t.timestamps
+    end
+  end
+end

serverside_challenge_2/challenge/db/migrate/20250726103216_remove_rounding_amount_method_from_provider.rb

@@ -0,0 +1,9 @@
+class RemoveRoundingAmountMethodFromProvider < ActiveRecord::Migration[7.0]
+  def up
+    remove_column :providers, :rounding_amount_method, :string
+  end
+
+  def down
+    add_column :providers, :rounding_amount_method, :string
+  end
+end

serverside_challenge_2/challenge/db/migrate/20250726111141_rename_provider_name_column_to_name.rb

@@ -0,0 +1,5 @@
+class RenameProviderNameColumnToName < ActiveRecord::Migration[7.0]
+  def change
+    rename_column :providers, :provider_name, :name
+  end
+end

serverside_challenge_2/challenge/db/migrate/20250726111346_rename_plan__name_column_to_name.rb

@@ -0,0 +1,5 @@
+class RenamePlanNameColumnToName < ActiveRecord::Migration[7.0]
+  def change
+        rename_column :power_supply_plans, :plan_name, :name
+  end
+end