class Console::ProgressBar

# File lib/contrib/progressbar.rb, line 37
def initialize(title, total, out = STDERR)
  @title = title
  @total = total
  @out = out
  @bar_length = 80
  @bar_mark = "o"
  @total_overflow = true
  @current = 0
  @previous = 0
  @is_finished = false
  @start_time = Time.now
  @format = "%-14s %3d%% %s %s"
  @format_arguments = [:title, :percentage, :bar, :stat]
  show_progress
end

# File lib/contrib/progressbar.rb, line 184
def bar_mark= (mark)
  @bar_mark = String(mark)[0..0]
end

# File lib/contrib/progressbar.rb, line 180
def file_transfer_mode
  @format_arguments = [:title, :percentage, :bar, :stat_for_file_transfer]  
end

# File lib/contrib/progressbar.rb, line 200
def finish
  @current = @total
  @is_finished = true
  show_progress
end

# File lib/contrib/progressbar.rb, line 192
def format= (format)
  @format = format
end

# File lib/contrib/progressbar.rb, line 196
def format_arguments= (arguments)
  @format_arguments = arguments
end

# File lib/contrib/progressbar.rb, line 206
def halt
  @is_finished = true
  show_progress
end

# File lib/contrib/progressbar.rb, line 226
def inc (step = 1)
  @current += step
  @current = @total if @current > @total
  show_progress
  @previous = @current
end

# File lib/contrib/progressbar.rb, line 233
def inspect
  "(ProgressBar: #{@current}/#{@total})"
end

# File lib/contrib/progressbar.rb, line 211
def set (count)
  if count < 0
    raise "invalid count less than zero: #{count}"
  elsif count > @total
    if @total_overflow
      @total = count + 1
    else
      raise "invalid count greater than total: #{count}"
    end
  end
  @current = count
  show_progress
  @previous = @current
end

# File lib/contrib/progressbar.rb, line 188
def total_overflow= (boolv)
  @total_overflow = boolv ? true : false
end

# File lib/contrib/progressbar.rb, line 115
def bar
  len = percentage * @bar_length / 100
  sprintf("|%s%s|", @bar_mark * len, " " *  (@bar_length - len))
end

# File lib/contrib/progressbar.rb, line 71
def bytes
  convert_bytes(@current)
end

# File lib/contrib/progressbar.rb, line 54
def convert_bytes (bytes)
  if bytes < 1024
    sprintf("%6dB", bytes)
  elsif bytes < 1024 * 1000 # 1000kb
    sprintf("%5.1fKB", bytes.to_f / 1024)
  elsif bytes < 1024 * 1024 * 1000  # 1000mb
    sprintf("%5.1fMB", bytes.to_f / 1024 / 1024)
  else
    sprintf("%5.1fGB", bytes.to_f / 1024 / 1024 / 1024)
  end
end

# File lib/contrib/progressbar.rb, line 94
def elapsed
  elapsed = Time.now - @start_time
  sprintf("Time: %s", format_time(elapsed))
end

# File lib/contrib/progressbar.rb, line 111
def eol
  if @is_finished then "\n" else "\r" end
end

# File lib/contrib/progressbar.rb, line 84
def eta
  if @current == 0
    "ETA:  --:--:--"
  else
    elapsed = Time.now - @start_time
    eta = elapsed * @total / @current - elapsed;
    sprintf("ETA:  %s", format_time(eta))
  end
end

# File lib/contrib/progressbar.rb, line 75
def format_time (t)
  t = t.to_i
  sec = t % 60
  min  = (t / 60) % 60
  hour = t / 3600
  sprintf("%02d:%02d:%02d", hour, min, sec);
end

# File lib/contrib/progressbar.rb, line 132
def get_width
  # FIXME: I don't know how portable it is.
  default_width = 80
  begin
    tiocgwinsz = 0x5413
    data = [0, 0, 0, 0].pack("SSSS")
    if @out.ioctl(tiocgwinsz, data) >= 0 then
      rows, cols, xpixels, ypixels = data.unpack("SSSS")
      if cols >= 0 then cols else default_width end
    else
      default_width
    end
  rescue Exception
    default_width
  end
end

# File lib/contrib/progressbar.rb, line 120
def percentage
  if @total.zero?
    100
  else
    @current  * 100 / @total
  end
end

# File lib/contrib/progressbar.rb, line 149
def show
  arguments = @format_arguments.map {|method| send(method) }
  line = sprintf(@format, *arguments)

  width = get_width
  if line.length == width - 1 
    @out.print(line + eol)
  elsif line.length >= width
    @bar_length = [@bar_length - (line.length - width + 1), 0].max
    if @bar_length == 0 then @out.print(line + eol) else show end
  else #line.length < width - 1
    @bar_length += width - line.length + 1
    show
  end
end

# File lib/contrib/progressbar.rb, line 165
def show_progress
  if @total.zero?
    cur_percentage = 100
    prev_percentage = 0
  else
    cur_percentage  = (@current  * 100 / @total).to_i
    prev_percentage = (@previous * 100 / @total).to_i
  end

  if cur_percentage > prev_percentage || @is_finished
    show
  end
end

# File lib/contrib/progressbar.rb, line 99
def stat
  if @is_finished then elapsed else eta end
end

# File lib/contrib/progressbar.rb, line 103
def stat_for_file_transfer
  if @is_finished then 
    sprintf("%s %s %s", bytes, transfer_rate, elapsed)
  else 
    sprintf("%s %s %s", bytes, transfer_rate, eta)
  end
end

# File lib/contrib/progressbar.rb, line 128
def title
  @title[0,13] + ":"
end

# File lib/contrib/progressbar.rb, line 66
def transfer_rate
  bytes_per_second = @current.to_f / (Time.now - @start_time)
  sprintf("%s/s", convert_bytes(bytes_per_second))
end