generate_password.rb

# Password Generator
# Class name: Originally I had named my class 'PasswordGenerator' and found this was causing a 'not a class' error. Changing the name of the class to 'GeneratePassword' fixed the problem.
# Boolean checking: When writing the validations for the arguements I wanted to check if that data passed in was a boolean. I was surprised to discover that you can't use: foo.is_a?(Boolean) in the same way that foo.is_a?(Integer) works. Found a neat way around it: !!foo == foo which converts the value to a boolean then checks it against itself.

class GeneratePassword

	def initialize(length, uppercase, lowercase, number, special)
		@length 	= length
		@uppercase 	= uppercase
		@lowercase 	= lowercase
		@number 	= number
		@special 	= special

		validate_args
		create_pool

		@password 	= generate
	end

	def password
		@password
	end

	def strength
		# Future Feature (work in progress)
		# => 81% (a percentage score showing how secure the password is)
	end

	def has_uppercase?
		if uppercase_letters.any? {|letter| @password.include?(letter)}
			return true
		else
			return false
		end
	end

	def has_lowercase?
		if lowercase_letters.any? {|letter| @password.include?(letter)}
			return true
		else
			return false
		end
	end

	def has_number?
		if numbers.any? {|number| @password.include?(number.to_s)}
			return true
		else
			return false
		end
	end

	def has_special?
		if special_characters.any? {|character| @password.include?(character)}
			return true
		else
			return false
		end
	end


	private 

	def generate
		# => A string of x many characters taken from the pool
		@length.times.map {@pool.sample}.join
	end

	def create_pool
		# => An array containing all potential characters/numbers for the password
		pool = []
		pool += uppercase_letters if @uppercase
		pool += lowercase_letters if @lowercase
		pool += numbers if @number
		pool += special_characters if @special
		@pool = pool
	end

	def uppercase_letters
		# => ["A", "B", "C", "D" etc ]
		('A'..'Z').to_a
	end

	def lowercase_letters
		# => ["a", "b", "c", "d" etc ]
		('a'..'z').to_a
	end

	def numbers
		# => ["1", "2", "3", "4" etc ]
		(0..9).to_a
	end

	def special_characters
		# => ["!", "$", "%", "&" etc ]
		%w(! $ % & * @ ^)
	end

	def validate_args
		validate_length_arg
		validate_uppercase_arg
		validate_lowercase_arg
		validate_number_arg
		validate_special_arg
	end

	def validate_length_arg
		unless @length.integer? && @length.between?(1,512)
			message = "Password Generator error: "
			message += "Your 1st argument should be an Integer between 1 and 512. "
			message += "It sets the length of your password."
			raise message
		end
	end

	def validate_uppercase_arg
		unless !!@uppercase == @uppercase
			message = "Password Generator error: "
			message += "Your 2nd argument should be a boolean. "
			message += "Set it to true to include uppercase letters from A-Z in your password."
			raise message
		end
	end

	def validate_lowercase_arg
		unless !!@lowercase == @lowercase
			message = "Password Generator error: "
			message += "Your 3rd argument should be a boolean. "
			message += "Set it to true to include lowercase letters from a-z in your password."
			raise message
		end
	end

	def validate_number_arg
		unless !!@number == @number
			message = "Password Generator error: "
			message += "Your 4th argument should be a boolean. "
			message += "Set it to true to include numbers from 0-9 in your password."
			raise message
		end
	end

	def validate_special_arg
		unless !!@special == @special
			message = "Password Generator error: "
			message += "Your 5th argument should be a boolean. "
			message += "Set it to true to include these special characters in your password: #{special_characters.join}."
			raise message
		end
	end

end