module Matrext

# File lib/matrext/core.rb, line 14
def self.process(options = {})
  defaults = {
    oneline:    false,
    alpha:      true,
    numeric:    true,
    random:     true,
    color:      nil,
    background: nil
  }
  options = defaults.merge(options)

  character_pool = create_character_pool(options)

  letters = options[:phrase]

  speed = options[:speed].to_sym unless options[:speed].nil?

  case speed
  when :insane
    noise_min = 1
    noise_max = 2
    delay_min = 0.0005
    delay_max = 0.0015
  when :fast
    noise_min = 2
    noise_max = 4
    delay_min = 0.003
    delay_max = 0.005
  when :slow
    noise_min = 5
    noise_max = 7
    delay_min = 0.03
    delay_max = 0.05
  else
    noise_min = NOISE_MIN_DEFAULT
    noise_max = NOISE_MIN_DEFAULT
    delay_min = DELAY_MIN_DEFAULT
    delay_max = DELAY_MAX_DEFAULT
  end

  letters.each_char do |l|
    letter_noise = rand(noise_min..noise_max)
    letter_delay = rand(delay_min..delay_max)

    (0..letter_noise).each do
      print get_random_letter(character_pool).colorize(color: options[:color], background: options[:background])
      sleep(letter_delay)
      print "\b"
    end

    if options[:color].nil?
      print l.upcase
    else
      print l.upcase.colorize(color: options[:color], background: options[:background])
    end

    sleep(letter_delay)
  end

  puts unless options[:oneline].equal? true
end

# File lib/matrext/core.rb, line 78
def self.alpha_chars
  ((65..90).map(&:chr) | (97..122).map(&:chr))
end

# File lib/matrext/core.rb, line 90
def self.create_character_pool(options)
  chars = []

  chars |= alpha_chars if options[:alpha]
  chars |= numeric_chars if options[:numeric]
  chars |= random_chars if options[:random]

  chars
end

# File lib/matrext/core.rb, line 100
def self.get_random_letter(chars)
  chars = ['X'] if chars.length <= 0

  chars[rand(0..chars.length - 1)]
end

# File lib/matrext/core.rb, line 82
def self.numeric_chars
  (48..57).map(&:chr)
end

# File lib/matrext/core.rb, line 86
def self.random_chars
  ((33..47).map(&:chr) | (91..96).map(&:chr) | (123..126).map(&:chr))
end