#1 --- Write a program that allows a user to play a guessing number game. Your program should generate a random number between 0 – 1000 (including 0, but not including 1000). Allow the user to make a guess until they guess the answer. After each guess you should print "higher" or "lower". When they guess it correctly print a winning message along with their total number of guesses.

#class that checkes if values are numeric
class String
  def is_number?
    true if Float(self) rescue false
  end
end

#random number in range 0-1000 with 0 included but not 1000
random_num = rand(-1..1000)
#FOR TESTING, REMOVE BEFORE SUBMITTING
puts random_num
number_guesses = 1

#welcome and retrieve user's guess
puts "Welcome to GUESS THAT NUMBER! Pick a number between 0 and 1000."
print "Your guess: "
user_guess = gets.chomp

#method to check if grade is numeric
if !user_guess.is_number?
  #if grade is not numeric, ask user for numeric value
  while !user_guess.is_number?
    print "Looks like you didn't enter a number. Re-enter a number: "
    user_guess = gets.chomp
  end
end

user_guess = user_guess.to_i

#allow user to make guess until it's correct
while user_guess != random_num
  #add 1 to number of guesses for every guess
  number_guesses += 1
  #if user guess is incorrect, tell user higher or lower
  if user_guess > random_num
    print "Guess lower: "
    user_guess = gets.chomp.to_i
    else print "Guess higher: "
    user_guess = gets.chomp.to_i
  end
end
#when guess correctly, print winning message with total of guesses made
puts "You guessed it! It only took " + number_guesses.to_s + " guesses!"
puts

#2 --- Write a program that plays duck duck goose. Allow the user to enter the player's number they want to call goose on, and then say "duck" for each player before the "goose", then say "goose" for the chosen player.
starting_player = 1

#welcome and ask which player is goose
puts "Welcome to Duck, Duck, Goose. Which player do you want Goose to land on?"
print "Goose is player number: "
goose = gets.chomp.to_i

#begin duck, duck, goose
for starting_player in 1..goose
  if starting_player === goose
    puts "Player " + starting_player.to_s + ": GOOSE"
    else puts "Player " + starting_player.to_s + ": Duck"
  end
end
puts

#2 --- Write a program that allows a user to enter the number of petals on a flower. Then one by one, print “plucking petal #1: they love me!”. Alternate “They love me” and “They love me not” as well as increase the petal number for each petal.

# user input on how many petals in a flower
puts "Welcome to Petal Plucker! How many petals do you want in your flower?"
print "Number of petals: "
petals = gets.chomp.to_i

for i in 1..petals
  # if petal is even, print they love me not
  if i % 2 === 0
    puts "Plucking petal #" + i.to_s + ": they love me not"
    # if petal is odd, print they love me
    else puts "Plucking petal #" + i.to_s + ": they love me"
  end
end
puts

#4 --- You don't trust your users. Modify the program below to require the user to enter the same value twice in order to add that value to the total.

puts "Hello! We are going to total some numbers! Enter a number twice to confirm you want that number totaled."
puts "Enter a negative number to quit."

#array to add numbers
number_list = []
previous_value = nil
exit = false
total = 0

while exit === false
  input = gets.chomp.to_i
  #iniating calculating and storing first value
  if previous_value === nil
    previous_value = input
    #check if new input is same as previous_value
    elsif input === previous_value && input >= 0
      total += input
      previous_value = nil
    #if input is same as previous_value, exit program
    elsif previous_value === input && input < 0
      exit = true
    #values do not match
    else previous_value = input
  end
end

puts "Result: #{total}"