#!/usr/bin/env ruby
# Usage: reverse_asciidoctor [FILE]...
# Usage: cat FILE | reverse_asciidoctor
require 'rubygems'
require 'bundler/setup'

require 'reverse_asciidoctor'
require 'optparse'
require 'fileutils'

OptionParser.new do |opts|
  opts.banner = "Usage: reverse_adoc [options] <file>"
  opts.on('-m', '--mathml2asciimath', 'Convert MathML to AsciiMath') do |v|
    ReverseAsciidoctor.config.mathml2asciimath = true
  end

  opts.on('-oFILENAME', '--output=FILENAME', 'Output file to write to') do |v|
    ReverseAsciidoctor.config.destination = File.expand_path(v)
    # puts "output goes to #{ReverseAsciidoctor.config.destination}"
  end

  opts.on('-e', '--external-images', 'Export images if data URI') do |v|
    ReverseAsciidoctor.config.external_images = true
  end

  opts.on('-f', '--input_format [html, smrl_description]', 'Unknown input format (default: html)') do |v|
    ReverseAsciidoctor.config.input_format = v
  end

  opts.on('-u', '--unknown_tags [pass_through, drop, bypass, raise]', 'Unknown tag handling (default: pass_through)') do |v|
    ReverseAsciidoctor.config.unknown_tags = v
  end

  opts.on('-v', '--version', 'Version information') do |v|
    puts "reverse_adoc: v#{ReverseAsciidoctor::VERSION}"
    exit
  end

  opts.on("-h", "--help", "Prints this help") do
    puts opts
    exit
  end

end.parse!

if filename = ARGV.pop
  input_content = IO.read(filename)
  ReverseAsciidoctor.config.sourcedir = File.dirname(File.expand_path(filename))
else
  if ReverseAsciidoctor.config.external_images
    raise "The -e | --external-images feature cannot be used with STDIN input. Exiting."
  end

  input_content = ARGF.read
end

if ReverseAsciidoctor.config.external_images && ReverseAsciidoctor.config.destination.nil?
  raise "The -e | --external-images feature must be used with -o | --output. Exiting."
end

# Read from STDIN
adoc_content = ReverseAsciidoctor.convert(input_content)

# Print to STDOUT
unless ReverseAsciidoctor.config.destination
  puts adoc_content
  exit
end

# Write output to ReverseAsciidoctor.config.destination
FileUtils.mkdir_p(File.dirname(ReverseAsciidoctor.config.destination))
File.open(ReverseAsciidoctor.config.destination, "w") do |file|
  file.write(adoc_content)
end