home_purchase_option.rb

require 'pry'
class HomePurchaseOption
  attr_accessor :equity_after_sale
  def initialize(property)
    @i = 0
    @property = property
    @mortgage_balance = {}
    equity_after_sale
    required_mortgage
  end

  def equity_after_sale
    @property.each do |ind_prop|
      @mortgage_balance[ind_prop["Address"]] = ind_prop["Selling Price"].to_i - ind_prop["Down Payment"].to_i
    end
  end

  def required_mortgage
    @mortgage_balance.each do |balance|
      puts "***#{balance[0]}***" 
      puts "Mortage: $#{balance[1]}"
      insurance_cost(2, balance[0], balance[1])
    end
  end

  def insurance_cost(years, home, balance)
    if pmi_required?(@property[@i]) == true
      puts "#{years} years of Insurance: #{years * balance * 0.005}\n "
    else 
      puts "#{years} years of Insurance: 0\n "
    end
  end

  def pmi_required?(property)
    @i += 1
    true if property["Property Value"].to_i * 0.2 > property["Down Payment"].to_i
  end
end

individual_property.rb

require 'CSV'

  class IndividualProperty
  attr_reader :choose_csv_file

  def initialize
    csv_file = "property_details.csv"
    #csv_file = choose_csv_file
    @property = []
    read_each_csv(csv_file)
    HomePurchaseOption.new(@property)
  end

  def choose_csv_file 
    puts "What csv file would you like to read?"
    print "> "
    #csv_file = gets.chomp
  end

  def read_each_csv(csv_file)
    CSV.foreach("#{csv_file}", headers: :true) do |individual_property|
      individual_property
      @property << individual_property
    end
  end
end

property_details.csv

run_file.rb

require_relative "individual_property"
require_relative "home_purchase_option"

IndividualProperty.new