#!/usr/bin/env ruby

require 'optparse'

lib = File.expand_path(File.dirname(__FILE__) + '/../lib')
$LOAD_PATH.unshift(lib) if File.directory?(lib) && !$LOAD_PATH.include?(lib)

require 'rmagick/screwdrivers'

# options = {
#   :widths            => 600,
#   :date_in_watermark => false,
#   :watermark         => nil,
#   :logger            => nil
# }.merge(options)

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: #{$0} [options] FILE [DIR]"

  # Verbose?
  opts.on("-v", "--verbose", "Run verbosely (default: false)") do |v|
    if v
      require 'logger'
      options[:logger] = Logger.new STDOUT
    end
  end
  # Quality
  opts.on("-q", "--quality [1-100]", Integer, "Quality of resulting JPEG (default: 90)") do |quality|
    options[:quality] = quality
  end
  # Widths
  opts.on("-w", "--widths X,Y,Z", Array, "Widths of scaled images (default: 600)") do |widths|
    options[:widths] = widths.map(&:to_i) - [0]
  end
  # Puts date on watermark?
  opts.on("-d", "--date_in_watermark", "Append date to watermark (default: false)") do |dow|
    options[:date_in_watermark] = dow
  end
  # Watermark text
  opts.on("-m", "--watermark TEXT", "Text to use as watermark (default: none)") do |w|
    options[:watermark] = w
  end

  # No argument, shows at tail.  This will print an options summary.
  opts.on_tail("-h", "--help", "Show this message") do
    puts opts
    exit
  end

end.parse!

raise "Run `#{$0} --help` for execution examples. Exiting…" if ARGV.size.zero? || ARGV.size > 2

file = ARGV.first
dir = ARGV.size == 2 ? ARGV.last : File.dirname(file)
`mkdir -p #{dir}`

Magick::Screwdrivers::scale(file, options).each { |img|
  outfile = File.basename(file).sub(/(\.\w+)$/, "-#{img.rows}×#{img.columns}\\1")
  img.write(File.join dir, outfile) { 
    self.quality = options[:quality] || 90 
  }
}