class RPiPinIn

# File lib/rpi_pinin.rb, line 11
def initialize(id, simulator=nil, pull: nil)
  
  @id, @simulator = id, simulator
  
  if not @simulator then
    unexport()
    
    File.write '/sys/class/gpio/export', id
    File.write "/sys/class/gpio/gpio#{id}/direction", 'in'
    
    case pull
    when :up
      File.write "/sys/class/gpio/gpio#{id}/direction", 'high'
    end
    
    at_exit {   unexport() }
  end
  
end

# File lib/rpi_pinin.rb, line 33
def on_change(value)
  
end

# File lib/rpi_pinin.rb, line 39
def on_high()
  
end

# File lib/rpi_pinin.rb, line 81
def to_s()
  @id
end

# File lib/rpi_pinin.rb, line 58
def watch()
  
  old_value = read_value()

  loop do
    
    value = read_value()
    
    if value != old_value then
      
      yield(value) if block_given?
      on_change(value)
      
    end
    
    old_value = value
    
    sleep 0.1
  end
  
end

# File lib/rpi_pinin.rb, line 43
def watch_high()
  
  watch() do |value|
    
    if value == 1 then
      
      yield if block_given?
      on_high()
      
    end
    
  end
  
end

# File lib/rpi_pinin.rb, line 87
def read_value()
  
  return FileX.read(@simulator) if @simulator
  File.read("/sys/class/gpio/gpio#{@id}/value").chomp  == '0' ? 1 : 0
  
end

# File lib/rpi_pinin.rb, line 97
def unexport()
  
  return unless File.exists? '/sys/class/gpio/gpio' + @id.to_s

  File.write "/sys/class/gpio/unexport", @id
end