require 'blink1'
require 'celluloid'

class Blinkenstein::Blink 
  include Celluloid

  attr_reader :timer

  def initialize
    blink.open
  end

  def finalize
    puts "Closing Blink1 Connection"
    blink.off
    blink.close
  end

  def breath(hex = "#0000ff", duration = 5, depth = 0.2) 
    play(animate_breath(hex, duration, depth))
  end

  def police
    animation = animate_breath("#ff0000", 0.5, 1) + animate_breath("#0000ff", 0.5, 1) 
    play(animation)
  end

  def play(animation, step = 0)
    timer.cancel if timer

    step = 0 if step >= animation.length
    r, g, b, t = animation[step] 

    @timer = after(t) do
      play(animation, step + 1)
    end

    blink.fade_to_rgb(t*1000, r, g, b)
  end


  # Amount should be a decimal between 0 and 1. Lower means darker
  def darken_color(hex_color, amount=0.4)
    hex_color = hex_color.gsub('#','')
    rgb = hex_color.scan(/../).map {|color| color.hex}
    rgb[0] = (rgb[0].to_i * amount).round
    rgb[1] = (rgb[1].to_i * amount).round
    rgb[2] = (rgb[2].to_i * amount).round
    rgb
  end

  # Amount should be a decimal between 0 and 1. Higher means lighter
  def lighten_color(hex_color, amount=0.6)
    hex_color = hex_color.gsub('#','')
    rgb = hex_color.scan(/../).map {|color| color.hex}
    rgb[0] = [(rgb[0].to_i + 255 * amount).round, 255].min
    rgb[1] = [(rgb[1].to_i + 255 * amount).round, 255].min
    rgb[2] = [(rgb[2].to_i + 255 * amount).round, 255].min
    rgb
  end


  def animate_breath(hex = "#0000ff", duration = 5, depth = 0.2) 
    breath_in_duration  = 1.0
    breath_out_duration = 1.3 

    breath_in_interval  = 0.1 * duration * breath_in_duration  / (breath_in_duration + breath_out_duration)
    breath_out_interval = 0.1 * duration * breath_out_duration / (breath_in_duration + breath_out_duration)

    ease_in   = [1.0000, 0.9933, 0.9707, 0.9277, 0.8573, 0.7487, 0.5872, 0.3685, 0.1541, 0.0325, 0.0000].map{|v| [v, breath_in_interval] }
    ease_out  = [1.0000, 0.9859, 0.9426, 0.8694, 0.7666, 0.6362, 0.4841, 0.3212, 0.1664, 0.0476, 0.0000].reverse.map{|v| [v, breath_out_interval] }

    (ease_in + ease_out).map do |v, t|
      darken_color(hex, 1 - (v * depth)) << t
    end
  end

  private

  def blink
    @@blink ||= Blink1.new
  end
end