#!/usr/bin/env ruby
# frozen_string_literal: true

require 'word-to-markdown'
require 'optparse'
require 'reverse_asciidoctor'

def scrub_whitespace(string)
  string = string.dup
  string.gsub!(/ |\ |\u00a0/i, ' ')       # HTML encoded spaces
  string.sub!(/^\A[[:space:]]+/m, '') # document leading whitespace
  string.sub!(/[[:space:]]+\z$/m, '') # document trailing whitespace
  string.gsub!(/([ ]+)$/, ' ')       # line trailing whitespace
  string.gsub!(/\n\n\n\n/, "\n\n")  # Quadruple line breaks
  #string.delete!(' ')               # Unicode non-breaking spaces, injected as tabs
  # following added by me
  string.gsub!(%r{<h[1-9][^>]*></h1>}, " ") # I don't know why Libre Office is inserting them, but they need to go
  string.gsub!(%r{<h1[^>]* style="vertical-align: super;[^>]*>([^<]+)</h1>},
              "<sup>\\1</sup>")         # I absolutely don't know why Libre Office is rendering superscripts as h1
  string
end

ARGV.push('-h') if ARGV.empty?

OptionParser.new do |opts|
  opts.banner = "Usage: w2a [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('-v', '--version', 'Version information') do |v|
    puts "reverse_adoc: v#{ReverseAsciidoctor::VERSION}"
    puts "[dependency] WordToMarkdown: v#{WordToMarkdown::VERSION}"
    unless Gem.win_platform?
      puts "[dependency] LibreOffice: v#{WordToMarkdown.soffice.version}"
    else
      puts "[dependency] LibreOffice: version not available on Windows"
    end
    exit
  end

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

end.parse!

filename = ARGV.pop
raise "Please provide an input file to process. Exiting." unless filename

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

ReverseAsciidoctor.config.sourcedir = Dir.mktmpdir
# puts "ReverseAsciidoctor.config.sourcedir #{ReverseAsciidoctor.config.sourcedir}"

doc = WordToMarkdown.new(filename, ReverseAsciidoctor.config.sourcedir)
adoc_content = ReverseAsciidoctor.convert(
  scrub_whitespace(doc.document.html),
  WordToMarkdown::REVERSE_MARKDOWN_OPTIONS
)
# puts scrub_whitespace(doc.document.html)

# 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