# frozen_string_literal: true

require 'open3'
require 'json'

_, status = Open3.capture2('node', '-v')
raise 'This gem requires node be installed and available on the PATH' unless status.success?

MAKE_PDF_COMMAND = File.expand_path('../javascript_bin/make_pdf.js', __FILE__)

class Pdfgen
  def initialize(html)
    @html = html
    @viewport_options = nil
    @emulate_media = nil
    @launch_options = nil
  end

  def set_viewport(viewport_options)
    @viewport_options = viewport_options
    self
  end

  def emulate_media(media_type)
    @emulate_media = media_type
    self
  end

  def launch_options(launch_options)
    @launch_options = launch_options
    self
  end

  def to_pdf(opts = {})
    stdin_options = { pdf_options: opts, current_path: Dir.pwd }
    stdin_options = stdin_options.merge(viewport_options: @viewport_options) if @viewport_options
    stdin_options = stdin_options.merge(emulate_media: @emulate_media) if @emulate_media
    stdin_options = stdin_options.merge(launch_options: @launch_options) if @launch_options
    file = Tempfile.new('input_html')
    file.write(@html)
    file.close
    pdf_output, status = Open3.capture2(MAKE_PDF_COMMAND, file.path, stdin_data: stdin_options.to_json)
    file.unlink
    unless status.success?
      raise 'There was an unknown error running node to create the pdf. Check your logs for output that might assist in debugging.'
    end
    unless pdf_output
      raise 'There was an error creating the temporary file used to pass the HTML to node.'
    end
    pdf_output
  end
end


# Use a new API that uses method chaining to configure the PDF and that queues up strings to put in a js file to run puppeteer