#!/usr/bin/env ruby

$:.unshift File.join(File.dirname(__FILE__), '..', 'lib')
require 'trollop'
require 'rubyfca'
require 'ruby_graphviz'

################ parse options ##########

opts = Trollop::options do
  version = File.read(File.dirname(__FILE__) + "/../VERSION")
  banner <<-EOS
  
RubuFCA converts Conexp CXT data to Graphviz dot format.

Usage:
       rubyfca [options] <source file> <output file>

where:
<source file>
       ".cxt"
<output file>
       ."dot", ".png", ".jpg", or ".eps"
[options]:
EOS

  opt :circle,  "Use circle shaped concept nodes", :default=> false
  opt :full, "Do not contract concept labels", :default=> false
  opt :legend, "Print the legend of concept nodes (available only when using circle node shape)", :default => false
  opt :coloring, "Color concept nodes", :default => false
  opt :straight, "Straighten edges (available when output format is either png, jpg, or eps)", :default => false
end

############### main program ############### 

if ARGV.size != 2
  showerror("Input and output files are not set properly", 1) 
end

filename1 = ARGV[0]  #input  filename
filename2 = ARGV[1]  #output filename

#
# extract input and output file types
#
input_type  = filename1.slice(/\.[^\.]+\z/).split(//)[1..-1].join("")
output_type = filename2.slice(/\.[^\.]+\z/).split(//)[1..-1].join("")

if (input_type !~ /\A(cxt|csv)\z/ || output_type !~ /\A(dot|png|jpg|eps)\z/)
  showerror("These file extensions are not (yet) supported.", 1)
end

#
# input cxt data is kept as plain text
#
f = File.open(filename1, "r")
inputdata = f.read
f.close

#
# ask for confirmation of overwriting an exisiting file
#
if (File.exist?(filename2) && !opts[:sil])
  print "#{filename2} exists and will be overwritten, OK? [y/n]"
  var1 = STDIN.gets;
  if /y/i !~ var1
    exit;
  end
end

#
# context data is converted to a hash table
#
begin
  ctxt = FormalContext.new(inputdata, !opts[:full])
  ctxt.calcurate
# rescue => e
#   puts e
#   showerror("Source data may have problems. Process aborted.", 1)
end

#
# create the output file
#
case output_type
when "dot"
  File.open(filename2, "w") do |f|
    f.write(ctxt.generate_dot(opts))
  end
when "png"
  ctxt.generate_img(filename2, "png", opts)
when "jpg"
  ctxt.generate_img(filename2, "jpg", opts)
when "eps"
  ctxt.generate_img(filename2, "eps", opts)
end