challengeA/okamoto

challengeA/okamoto/.gitignore

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+/spec/examples.txt

challengeA/okamoto/.rspec

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+--require spec_helper

challengeA/okamoto/Gemfile

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+source "https://rubygems.org"
+
+gem 'rspec'

challengeA/okamoto/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    diff-lcs (1.4.4)
+    rspec (3.10.0)
+      rspec-core (~> 3.10.0)
+      rspec-expectations (~> 3.10.0)
+      rspec-mocks (~> 3.10.0)
+    rspec-core (3.10.1)
+      rspec-support (~> 3.10.0)
+    rspec-expectations (3.10.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-mocks (3.10.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-support (3.10.2)
+
+PLATFORMS
+  x64-mingw32
+
+DEPENDENCIES
+  rspec
+
+BUNDLED WITH
+   2.2.20

challengeA/okamoto/README.md

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+# CHALLENGE A
+
+## 概要
+
+契約アンペア(A)と月の電力使用量(kWh)の入力に応じて、各プラン名と料金のシミュレーションを行うスクリプトです。
+
+## シミュレーション実行方法
+
+```sh
+ruby main.rb
+```
+
+## データの編集
+
+JSON形式で`/data`のディレクトリに格納しています。プラン追加や編集の際はJSONデータを修正することで対応できるように実装しています。
+
+## テスト
+
+```sh
+bundle exec rspec
+```
+
+## 補足事項
+
+- 合計電気料金は小数点以下切り捨て
+
+## 参考文献
+
+- オブジェクト指向設計実践ガイド
+- [使えるRSpec入門](https://qiita.com/jnchito/items/42193d066bd61c740612)

challengeA/okamoto/data/plans.json

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+[
+  {
+    "name": "従量電灯B",
+    "provider_name": "東京電力エナジーパートナー",
+    "basic_price": [
+      {
+        "ampere": 10,
+        "price": 286.0
+      },
+      {
+        "ampere": 15,
+        "price": 429.0
+      },
+      {
+        "ampere": 20,
+        "price": 572.0
+      },
+      {
+        "ampere": 30,
+        "price": 858.0
+      },
+      {
+        "ampere": 40,
+        "price": 1144.0
+      },
+      {
+        "ampere": 50,
+        "price": 1430.0
+      },
+      {
+        "ampere": 60,
+        "price": 1716.0
+      }
+    ],
+    "pay_per_use_price": [
+      {
+        "price_per_kwh": 19.88,
+        "min_kwh": 0
+      },
+      {
+        "price_per_kwh": 26.48,
+        "min_kwh": 120
+      },
+      {
+        "price_per_kwh": 30.57,
+        "min_kwh": 300
+      }
+    ]
+  },
+  {
+    "name": "おうちプラン",
+    "provider_name": "Looopでんき",
+    "basic_price": [
+      {
+        "ampere": 10,
+        "price": 0
+      },
+      {
+        "ampere": 15,
+        "price": 0
+      },
+      {
+        "ampere": 20,
+        "price": 0
+      },
+      {
+        "ampere": 30,
+        "price": 0
+      },
+      {
+        "ampere": 40,
+        "price": 0
+      },
+      {
+        "ampere": 50,
+        "price": 0
+      },
+      {
+        "ampere": 60,
+        "price": 0
+      }
+    ],
+    "pay_per_use_price": [
+      {
+        "price_per_kwh": 26.40,
+        "min_kwh": 0
+      }
+    ]
+  },
+  {
+    "name": "ずっとも電気１",
+    "provider_name": "東京ガス",
+    "basic_price": [
+      {
+        "ampere": 30,
+        "price": 858.0
+      },
+      {
+        "ampere": 40,
+        "price": 1144.0
+      },
+      {
+        "ampere": 50,
+        "price": 1430.0
+      },
+      {
+        "ampere": 60,
+        "price": 1716.0
+      }
+    ],
+    "pay_per_use_price": [
+      {
+        "price_per_kwh": 23.67,
+        "min_kwh": 0
+      },
+      {
+        "price_per_kwh": 23.88,
+        "min_kwh": 140
+      },
+      {
+        "price_per_kwh": 26.41,
+        "min_kwh": 350
+      }
+    ]
+  },
+  {
+    "name": "従量電灯Bたっぷりプラン",
+    "provider_name": "JXTGでんき",
+    "basic_price": [
+      {
+        "ampere": 30,
+        "price": 858.0
+      },
+      {
+        "ampere": 40,
+        "price": 1144.0
+      },
+      {
+        "ampere": 50,
+        "price": 1430.0
+      },
+      {
+        "ampere": 60,
+        "price": 1716.8
+      }
+    ],
+    "pay_per_use_price": [
+      {
+        "price_per_kwh": 19.88,
+        "min_kwh": 0
+      },
+      {
+        "price_per_kwh": 26.48,
+        "min_kwh": 120
+      },
+      {
+        "price_per_kwh": 25.08,
+        "min_kwh": 300
+      },
+      {
+        "price_per_kwh": 26.15,
+        "min_kwh": 600
+      }
+    ]
+  }
+]

challengeA/okamoto/lib/plan.rb

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+class Plan
+  attr_reader :name, :provider_name, :basic_prices, :pay_per_use_prices
+
+  def initialize(name:, provider_name:, basic_prices:, pay_per_use_prices:)
+    @name = name
+    @provider_name = provider_name
+    @basic_prices = basic_prices
+    @pay_per_use_prices = pay_per_use_prices
+  end
+
+  def available?(contract_amp)
+    basic_prices.find { |price| price['ampere'] == contract_amp }
+  end
+
+  def plan_with_price(contract_amp, power_usage)
+    {
+      provider_name: provider_name,
+      plan_name: name,
+      price: sum_price(contract_amp, power_usage)
+    }
+  end
+
+  private
+
+  def sum_price(contract_amp, power_usage)
+    (basic_price(contract_amp) + pay_per_use_price(power_usage)).floor
+  end
+
+  def basic_price(contract_amp)
+    basic_prices.find { |price| price['ampere'] == contract_amp }['price']
+  end
+
+  def pay_per_use_price(power_usage)
+    sum = 0
+    power_usage_before_stage = 0
+    sorted_pay_per_use_price_lists(power_usage).each do |price_list|
+      power_usage_current_stage = power_usage - price_list['min_kwh'] - power_usage_before_stage
+      #丸め誤差が生じるため小数点第四位を四捨五入とする
+      sum += (price_list['price_per_kwh'] * power_usage_current_stage).round(3)
+      power_usage_before_stage += power_usage_current_stage
+    end
+    sum
+  end
+
+  def sorted_pay_per_use_price_lists(power_usage)
+    pay_per_use_price_lists(power_usage).sort_by {|list| list['min_kwh']}.reverse
+  end
+
+  def pay_per_use_price_lists(power_usage)
+    pay_per_use_prices.select { |price| price['min_kwh'] <= power_usage }
+  end
+end

challengeA/okamoto/lib/plans.rb

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+require './lib/plan'
+require 'json'
+JSON_FILE_PATH = '../data/plans.json'
+
+class Plans
+  attr_reader :contract_amp, :power_usage, :plans
+
+  def initialize(contract_amp, power_usage)
+    @plans = load_plans
+    @contract_amp = contract_amp
+    @power_usage = power_usage
+  end
+
+  def show_plans
+    plans.map { |plan| plan.available?(contract_amp)? plan.plan_with_price(contract_amp, power_usage) : nil }.compact
+  end
+
+  private
+
+  def load_plans
+    load_json.map {|data| Plan.new(
+      name: data['name'],
+      provider_name: data['provider_name'],
+      basic_prices: data['basic_price'],
+      pay_per_use_prices: data['pay_per_use_price']
+    )}
+  end
+
+  def load_json
+    json_file_path = File.expand_path(JSON_FILE_PATH, __dir__)
+    JSON.load(File.open(json_file_path))
+  end
+end

challengeA/okamoto/lib/simulator.rb

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+require './lib/plans'
+
+class Simulator
+  attr_reader :contract_amp, :power_usage, :plans
+
+  def initialize(contract_amp, power_usage)
+    @contract_amp = contract_amp
+    @power_usage = power_usage
+    @plans = Plans.new(contract_amp, power_usage)
+  end
+
+  def simulate
+    plans.show_plans
+  end
+end

challengeA/okamoto/main.rb

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+require './lib/simulator'
+
+AVAILABLE_AMP = [10, 15, 20, 30, 40, 50, 60]
+
+puts '契約アンペア数を数字のみで入力してください。'
+puts "#{AVAILABLE_AMP}の中から選択してください。"
+contract_amp = gets.to_i
+
+unless AVAILABLE_AMP.include?(contract_amp)
+  puts '契約アンペア数の入力が不正です。'
+  exit
+end
+
+puts '電力使用量(kWh)を整数のみで入力してください'
+power_usage = gets.to_i
+
+if power_usage.negative?
+  puts '電力使用量(kWh)は0以上を入力してください。'
+  exit
+end
+
+simulator = Simulator.new(contract_amp, power_usage)
+plan_lists = simulator.simulate
+
+if plan_lists.empty?
+  puts '条件に一致するプランはありません。'
+else
+  puts 'ご入力いただいた条件での見積もり結果は以下の通りです。'
+  puts "契約アンペア：#{contract_amp}(A), 電力使用量：#{power_usage}(kwh)"
+  puts '================================================'
+  plan_lists.each do |plan|
+    puts "プロバイダー名：#{plan[:provider_name]}"
+    puts "プラン名：#{plan[:plan_name]}"
+    puts "月額料金：#{plan[:price]}円"
+    puts '================================================'
+  end
+end