Created
February 10, 2022 04:48
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| require "money" | |
| Money.locale_backend = nil | |
| Money.rounding_mode = BigDecimal::ROUND_HALF_UP | |
| module ProgrammingRuby | |
| module Refactoring | |
| class InvoicePrinter | |
| def statement(invoice, plays) | |
| total_amount = 0 | |
| volume_credits = 0 | |
| result = "Statement for #{invoice[:customer]}\n" | |
| invoice[:performances].each do |perf| | |
| play = plays.fetch(perf[:playID].to_sym) | |
| amount = 0 | |
| case play[:type] | |
| when "tragedy" | |
| amount = 40000 | |
| if perf[:audience] > 30 | |
| amount += 1000 * (perf[:audience] - 30) | |
| end | |
| when "comedy" | |
| amount = 30000 | |
| if perf[:audience] > 20 | |
| amount += 10000 + 500 * (perf[:audience] - 20) | |
| end | |
| amount += 300 * perf[:audience] | |
| else | |
| raise StandardError.new "Unknown Type: #{play[:type]}" | |
| end | |
| # add volume credits | |
| volume_credits += [perf[:audience] - 30, 0].max | |
| # add extra credits for every ten comedy attendees | |
| if play[:type] == "comedy" | |
| volume_credits += (perf[:audience] / 5).floor | |
| end | |
| # print line for this order | |
| result += " #{play[:name]}: #{Money.us_dollar(amount).format} (#{perf[:audience]} seats)\n" | |
| total_amount += amount | |
| end | |
| result += "Amount owed is #{Money.us_dollar(total_amount).format}\n" | |
| result += "You earned #{volume_credits} credits\n" | |
| result | |
| end | |
| end | |
| end | |
| end |
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