cashier.rb

require 'pry'
require 'csv'

def prompt(query)
  puts query
  gets.chomp
end

def get_data
  item = prompt "What is the name of the item?"
  sku = prompt "What is the SKU"
  sell_price = prompt "What do we sell it for?"
  buy_price = prompt "What do we buy it for"
  write_to_inventory(item,sku,sell_price,buy_price)
  puts "Congrats, #{item} was added to the inventory database."
  inventory_query
end

def write_to_inventory (item, sku, sell_price, buy_price)
  File.open("Inventory.csv", 'a+') {|f| f.puts([item, sku, sell_price, buy_price].join(","))}
end

def list_sales_for(date_range)
  if date_range == "today"
    date = Date.today
    CSV.foreach("transactions.csv", headers: true) do |line|
      parsed = Date.parse(line["date"])  
      if date == parsed
        puts "On #{date} You sold #{line["items_sold"]}(s)."
      end
    end
  else
    date = Date.parse(date_range)
    CSV.foreach("transactions.csv", headers: true) do |line|
      parsed = Date.parse(line["date"])  
      if date == parsed
        puts "On #{date} You sold #{line["items_sold"]}(s)."
      end
    end
  end
end

def inspect_sales
  date_range = prompt "Please enter the date(s) you'd like to inspect. (YYYY-MM-DD)"
  list_sales_for(date_range)
end

def general_inquiry
  do_this = prompt "Would you like to conduct a transaction (sell), add to the inventory (add), or inspect sales history (inspect)?"
  if do_this == "sell"
    select_products
  elsif do_this == "add"
    get_data
  elsif do_this == "inspect"
    inspect_sales
  end
end

@amount_due = 0.0

def list_inventory
  @stock = Hash.new
  puts "0 [DONE]"
  CSV.foreach("Inventory.csv", headers: true) do |line|
    @stock.store(line["item"], line["sell_price"])
  end
  #List inventory
  #select from inventory
  #select quantity
  #pyotr
  @stock.each_with_index do |item, index|
    puts "#{index+1} #{item}"
  end
end

@basket = []

def total
  @total = 0.0
  @basket.each do |item|
    purchase_price = item[:price].to_f*item[:quantity].to_f
    @total += purchase_price
  end
  transaction(@total)
end

def select_products
  list_inventory
  selection = ""
  puts "What product would you like to buy?"
  selection = gets.chomp.to_i
  if selection == 0
    total
  else
    choice = selection - 1
    @stock.each_with_index do |(name, price), index|
      if choice == index
        quantity = prompt "How many #{name}'s would the customer like?"
        item = { name: name, quantity: quantity, price: price }
        @basket << item
      end
    end
    select_products 
  end 
end

def write_to_transaction_history(date, time, items_sold, revenue)
  CSV.open("transactions.csv", 'a+') do |f| 
    f << [date, time, items_sold, revenue]
  end
end

def log_transaction(date, time, basket, total)
  sold = []
  basket.each do |item|
    product = item[:name]
    quantity_sold = item[:quantity]
    sold << "#{item[:quantity]} #{item[:name]}(s) sold"
  end
  revenue = total
  write_to_transaction_history(date, time, sold.join(", "), revenue)
end


def transaction(total)
  date = Date.today
  time = Time.now.strftime("%I:%M%P")
  amount_due = total
  puts "The customer owes you $#{"%.2f" % amount_due}."
  puts "How much money did the customer give you?"
  tendered = gets.chomp.to_f
  if tendered >= amount_due
    change = tendered-amount_due
    change = change.to_f
    puts "Please return $#{"%.2f" % change} in change to the customer."
    log_transaction(date, time, @basket, amount_due)
  else
    "The customer did not give you enough cash."
  end
end

general_inquiry