chap_09_e.rb

=begin

Write a program so that you can interact with your baby dragon. You should be
able to enter commands like  feed and walk, and have those methods be called on
your dragon. Of course, since what you are inputting are just strings, you will
have to have some sort of method dispatch, where your program checks which
string was entered, and then calls the appropriate method.

=end

class Dragon

  def initialize name
    @name = name
    @asleep = false
    @stuffInBelly     = 10  # He's full.
    @stuffInIntestine =  0  # He doesn't need to go.

    puts @name + ' is born.'
  end

  def feed
    puts 'You feed ' + @name + '.'
    @stuffInBelly = 10
    passageOfTime
  end

  def walk
    puts 'You walk ' + @name + '.'
    @stuffInIntestine = 0
    passageOfTime
  end

  def putToBed
    puts 'You put ' + @name + ' to bed.'
    @asleep = true
    3.times do
      if @asleep
        passageOfTime
      end
      if @asleep
        puts @name + ' snores, filling the room with smoke.'
      end
    end
    if @asleep
      @asleep = false
      puts @name + ' wakes up slowly.'
    end
  end

  def toss
    puts 'You toss ' + @name + ' up into the air.'
    puts 'He giggles, which singes your eyebrows.'
    passageOfTime
  end

  def rock
    puts 'You rock ' + @name + ' gently.'
    @asleep = true
    puts 'He briefly dozes off...'
    passageOfTime
    if @asleep
      @asleep = false
      puts '...but wakes when you stop.'
    end
  end

  private

  # "private" means that the methods defined here are
  # methods internal to the object.  (You can feed
  # your dragon, but you can't ask him if he's hungry.)

  def hungry?
    # Method names can end with "?".
    # Usually, we only do this if the method
    # returns true or false, like this:
    @stuffInBelly <= 2
  end

  def poopy?
    @stuffInIntestine >= 8
  end

  def passageOfTime
    if @stuffInBelly > 0
      # Move food from belly to intestine.
      @stuffInBelly     = @stuffInBelly     - 1
      @stuffInIntestine = @stuffInIntestine + 1
    else  # Our dragon is starving!
      if @asleep
        @asleep = false
        puts 'He wakes up suddenly!'
      end
      puts @name + ' is starving!  In desperation, he ate YOU!'
      exit  # This quits the program.
    end

    if @stuffInIntestine >= 10
      @stuffInIntestine = 0
      puts 'Whoops!  ' + @name + ' had an accident...'
    end

    if hungry?
      if @asleep
        @asleep = false
        puts 'He wakes up suddenly!'
      end
      puts @name + '\'s stomach grumbles...'
    end

    if poopy?
      if @asleep
        @asleep = false
        puts 'He wakes up suddenly!'
      end
      puts @name + ' does the potty dance...'
    end
  end

end

puts "Please name your dragon:"
name = gets.chomp

my_dragon = Dragon.new name

game_over = 0

while game_over == 0
  puts "Please enter a command:"
  command = gets.chomp.downcase

  if command == "feed"
    my_dragon.feed
  elsif command == "walk"
    my_dragon.walk
  elsif command == "put to bed"
    my_dragon.putToBed
  elsif command == "toss"
    my_dragon.toss
  elsif command == "rock"
    my_dragon.rock
  else
    puts "That is not a valid dragon command!"
  end

end