Class: Goby::Shop

Inherits:
Event
  • Object
show all
Defined in:
lib/goby/event/shop.rb

Overview

Allows a player to buy and sell Items.

Constant Summary collapse

NO_ITEMS_MESSAGE =

Message for when the shop has nothing to sell.

"Sorry, we're out of stock right now!\n\n"
NOTHING_TO_SELL =

Message for when the player has nothing to sell.

"You have nothing to sell!\n\n"
WARES_MESSAGE =

Introductory greeting at the shop.

"Please take a look at my wares.\n\n"

Constants inherited from Event

Event::DEFAULT_RUN_TEXT

Instance Attribute Summary collapse

Attributes inherited from Event

#command, #mode, #visible

Instance Method Summary collapse

Methods inherited from Event

#==

Constructor Details

#initialize(name: "Shop", mode: 0, visible: true, items: []) ⇒ Shop

Returns a new instance of Shop.

Parameters:

  • name (String) (defaults to: "Shop") —

    the name.

  • mode (Integer) (defaults to: 0) —

    convenient way for a shop to have multiple actions.

  • visible (Boolean) (defaults to: true) —

    whether the shop can be seen/activated.

  • items ([Item]) (defaults to: []) —

    an array of items that the shop sells.



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# File 'lib/goby/event/shop.rb', line 19

def initialize(name: "Shop", mode: 0, visible: true, items: [])
  super(mode: mode, visible: visible)
  @name = name
  @command = "shop"
  @items = items
end

Instance Attribute Details

#items ⇒ Object

Returns the value of attribute items.



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# File 'lib/goby/event/shop.rb', line 186

def items
  @items
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/goby/event/shop.rb', line 186

def name
  @name
end

Instance Method Details

#buy(player) ⇒ Object

The chain of events for buying an item (w/ error checking).

Parameters:

  • player (Player) —

    the player trying to buy an item.



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# File 'lib/goby/event/shop.rb', line 29

def buy(player)

  print_items
  return if @items.empty?

  print "What would you like (or none)?: "
  name = player_input
  index = has_item(name)

  # The player does not want to buy an item.
  return if name.casecmp("none").zero?

  if index.nil? # non-existent item.
    print "I don't have #{name}!\n\n"
    return
  end

  # The specified item exists in the shop's inventory.
  item = @items[index]
  print "How many do you want?: "
  amount_to_buy = player_input
  total_cost = amount_to_buy.to_i * item.price

  if total_cost > player.gold # not enough gold.
    puts "You don't have enough gold!"
    print "You only have #{player.gold}, but you need #{total_cost}!\n\n"
    return
  elsif amount_to_buy.to_i < 1 # non-positive amount.
    puts "Is this some kind of joke?"
    print "You need to request a positive amount!\n\n"
    return
  end

  # The player specifies a positive amount.
  player.remove_gold(total_cost)
  player.add_item(item, amount_to_buy.to_i)
  print "Thank you for your patronage!\n\n"

end

#has_item(name) ⇒ Integer

Returns the index of the specified item, if it exists.

Parameters:

  • name (String) —

    the item’s name.

Returns:

  • (Integer) —

    the index of an existing item. Otherwise nil.



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# File 'lib/goby/event/shop.rb', line 73

def has_item(name)
  @items.each_with_index do |item, index|
    return index if item.name.casecmp(name).zero?
  end
  return
end

#print_gold_and_greeting(player) ⇒ String

Displays the player’s current amount of gold and a greeting. Inquires about next action.

Parameters:

  • player (Player) —

    the player interacting with the shop.

Returns:

  • (String) —

    the player’s input.



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# File 'lib/goby/event/shop.rb', line 85

def print_gold_and_greeting(player)
  puts "Current gold in your pouch: #{player.gold}."
  print "Would you like to buy, sell, or exit?: "
  input = player_input doublespace: false
  print "\n"
  return input
end

#print_items ⇒ Object

Displays a formatted list of the Shop’s items or a message signaling there is nothing to sell.



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# File 'lib/goby/event/shop.rb', line 95

def print_items
  if @items.empty?
    print NO_ITEMS_MESSAGE
  else
    print WARES_MESSAGE
    @items.each { |item| puts "#{item.name} (#{item.price} gold)" }
    print "\n"
  end
end

#purchase_price(item) ⇒ Integer

The amount for which the shop will purchase the item.

Parameters:

  • item (Item) —

    the item in question.

Returns:

  • (Integer) —

    the amount for which to purchase.



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# File 'lib/goby/event/shop.rb', line 109

def purchase_price(item)
  item.price / 2
end

#run(player) ⇒ Object

The default shop experience.

Parameters:

  • player (Player) —

    the player interacting with the shop.



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# File 'lib/goby/event/shop.rb', line 116

def run(player)

  # Initial greeting.
  puts "Welcome to #{@name}."
  input = print_gold_and_greeting(player)

  while input.casecmp("exit").nonzero?
    if input.casecmp("buy").zero?
      buy(player)
    elsif input.casecmp("sell").zero?
      sell(player)
    end
    input = print_gold_and_greeting(player)
  end

  print "#{player.name} has left #{@name}.\n\n"
end

#sell(player) ⇒ Object

The chain of events for selling an item (w/ error checking).

Parameters:

  • player (Player) —

    the player trying to sell an item.



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# File 'lib/goby/event/shop.rb', line 137

def sell(player)

  # The player has nothing to sell.
  if player.inventory.empty?
    print NOTHING_TO_SELL
    return
  end

  player.print_inventory

  print "What would you like to sell? (or none): "
  input = player_input
  index = player.has_item(input)

  # The player does not want to sell an item.
  return if input.casecmp("none").zero?

  if index.nil? # non-existent item.
    print "You can't sell what you don't have.\n\n"
    return
  end

  item = player.inventory[index].first
  item_count = player.inventory[index].second

  unless item.disposable # non-disposable item (cannot sell/drop).
    print "You cannot sell that item.\n\n"
    return
  end

  puts "I'll buy that for #{purchase_price(item)} gold."
  print "How many do you want to sell?: "
  amount_to_sell = player_input.to_i

  if amount_to_sell > item_count # more than in the inventory.
    print "You don't have that many to sell!\n\n"
    return
  elsif amount_to_sell < 1 # non-positive amount specified.
    puts "Is this some kind of joke?"
    print "You need to sell a positive amount!\n\n"
    return
  end

  player.add_gold(purchase_price(item) * amount_to_sell)
  player.remove_item(item, amount_to_sell)
  print "Thank you for your patronage!\n\n"

end