#!/usr/bin/env ruby

require 'optparse'

actions = []
images = []
original_image = nil

opts = OptionParser.new do |opts|
  opts.banner = "Usage: image_voodoo [actions] image_file"
  opts.separator "Perform some actions on a source image."

  opts.separator ""
  opts.separator "Actions are meant to be chained. Examples:"
  opts.separator "  # Print the dimensions"
  opts.separator "  image_voodoo --dim small.jpg"
  opts.separator ""
  opts.separator "  # Convert to a thumbnail, preview, and then save the result"
  opts.separator "  image_voodoo --thumb 50 --preview --save thumb.png large.jpg"
  opts.separator ""
  opts.separator "  # Convert source to 3 thumbnails, showing dimensions and"
  opts.separator "  # previewing along the way"
  opts.separator "  image_voodoo --dim --resize 50x50 --dim --preview --save t1.jpg"
  opts.separator "    --pop --resize 40x40 --dim --preview --save t2.jpg"
  opts.separator "    --pop --resize 30x30 --dim --preview --save t3.jpg image.jpg"

  opts.separator ""
  opts.separator "Actions:"

  opts.on("-d", "--dimensions", "Print the image dimensions") do
    actions << lambda {|img| puts "#{img.width}x#{img.height}"; img }
  end

  opts.on("-s", "--save FILENAME", "Save the results to a new file") do |f|
    actions << lambda {|img| img.save(f); img }
  end

  opts.on("-t", "--thumbnail SIZE", Integer, "Create a thumbnail of the given size") do |size|
    actions << lambda {|img| result = nil; img.thumbnail(size) {|img2| result = img2 }; result }
  end

  opts.on("-p", "--preview", "Preview the image. Close the frame window",
    "to continue, or quit the application to", "abort the action pipeline") do
    actions << lambda do |img|
      done = false
      img.preview { done = true }
      Thread.pass until done
      img
    end
  end

  opts.on("--push", "Save the current image to be popped later") do
    actions << lambda {|img| images << img; img }
  end

  opts.on("--pop", "Revert back to the previous saved image", "or the original source image") do
    actions << lambda {|img| images.pop || original_image }
  end

  opts.on("-r", "--resize WIDTHxHEIGHT", "Create a new image with the specified", "dimensions") do |dim|
    width, height = dim.split(/x/i).map {|v| v.to_i}
    opts.usage "You need to specify proper dimensions" unless width && width > 0 && height && height > 0
    actions << lambda {|img| result = nil; img.resize(width,height) {|img2| result = img2}; result }
  end

  opts.on_tail("-h", "--help", "Show this message") do
    puts opts
    exit 0
  end

  def opts.usage(msg)
    puts msg
    puts self
    exit 1
  end
end
opts.parse!(ARGV)
opts.usage("You need to supply a source image filename.") unless ARGV.first
opts.usage("You need to supply one or more actions.") unless actions.size > 0

require 'image_voodoo'
ImageVoodoo.with_image(ARGV.first) do |img|
  original_image = img
  actions.each do |act|
    img = act.call(img)
  end
end
# Be sure we exit out of swing
java.lang.System.exit(0)