#!/usr/bin/env ruby

require "nokogiri"
require "open-uri"
require 'optparse'

options = {}

opt_parser = OptionParser.new do |opt|
  opt.banner = 'Usage: convert-html-to-utf8.rb [OPTIONS]'
  opt.separator  ''
  opt.separator  'Options'
  opt.separator  '     ****'
  opt.separator  '     ****'
  opt.separator  '     ****'
  opt.separator  ''

  opt.on('-p', '--printout PRINTOUT', 'which environment you want server run') do |printout|
    options['printout'] = printout
  end
  
  opt.on('-i', '--inputhtml HTMLIN', 'which environment you want server run') do |inputfile|
    options['inputhtmlfile'] = inputfile
  end

  opt.on('-o', '--outputhtml HTMLOUT', 'which environment you want server run') do |outputfile|
    options['outputhtmlfile'] = outputfile
  end

  opt.on('-h', '--help', 'help') do
    puts opt_parser
  end
end

opt_parser.parse!

if options['inputhtmlfile'] == nil or options['inputhtmlfile'].class != String or options['inputhtmlfile'].empty? or !File.exists?(options['inputhtmlfile'])
	STDERR.puts("Missing INPUT filename OR the file doesn't exits")
	exit 1
end


if ( options['outputhtmlfile'] == nil or options['outputhtmlfile'].class != String or options['outputhtmlfile'].empty?) and  ( options['printout'] == nil or  options['printout'].empty? )
        STDERR.puts("Missing OUPUT filename OR --printout option is not used")
        exit 1
end

if options['printout'] != nil or  ( options['printout'].class == String and !options['printout'].empty? )
	STDERR.puts("Printing output to STDOUT")
end


original_filename = options['inputhtmlfile']
STDERR.puts("Working on file => #{options['inputhtmlfile']}")

$html_doc = ""

begin
  $html_doc = File.open(original_filename) { |f| Nokogiri::HTML(f) }
rescue => e
	STDERR.puts(e)
	STDERR.puts(e.inspect)
	STDERR.puts("Error accured while reading and parsing html file => #{options['inputhtmlfile']}")
	exit 1
end

STDERR.puts("Finished processing html file => #{options['inputhtmlfile']}")

if options['printout'] != nil or ( options['printout'].class == String and  !options['printout'].empty?)
	STDOUT.puts($html_doc.to_html)
else
	begin
		File.write(options['outputhtmlfile'], $html_doc.to_html)
	rescue => e
		STDERR.puts(e)
		STDERR.puts(e.inspect)
		STDERR.puts("Error accured while writingthe html file => #{options['outputhtmlfile']}")
		exit 1
	end
end