module Arbolito

# File lib/arbolito.rb, line 14
def add_currency_rate(currency_price, from_to_currencies)
  rate = Currency::NonExpirableRate.new(currency_price, from_to_currencies) 
  add_to_store(rate)
end

# File lib/arbolito.rb, line 23
def convert(money, from_to_currencies)
  quote = Currency::Quote.new(from_to_currencies)

  rate = fetch(quote)

  rate.convert(money)
end

# File lib/arbolito.rb, line 19
def current_rate(from_to_currencies) 
  fetch(Currency::Quote.new(from_to_currencies)).price
end

# File lib/arbolito.rb, line 35
def set(config_key, value)
  settings[config_key] = value
end

# File lib/arbolito.rb, line 31
def settings
  @settings ||= {}
end

# File lib/arbolito.rb, line 40
def add_to_store(rate)
  store.add(rate)
  store.add(rate.backwards)
end

# File lib/arbolito.rb, line 61
def exchange
  settings[:exchange] ||= Exchange::YahooFinance
end

# File lib/arbolito.rb, line 65
def expiration_time
  settings[:expiration_time] ||= 60
end

# File lib/arbolito.rb, line 45
def fetch(quote)
  rate = store.fetch(quote)

  if(!rate || rate.expired?(expiration_time))
    rate = exchange.find_current_rate(quote)

    store.add(rate)
  end

  rate
end

# File lib/arbolito.rb, line 57
def store
  settings[:store] ||= Store::Memory
end