class TerraformLandscape::Printer

def process_string(plan_output) # rubocop:disable Metrics/MethodLength
  scrubbed_output = strip_ansi(plan_output)
  # Remove initialization messages like
  # "- Downloading plugin for provider "aws" (1.1.0)..."
  # as these break the parser which thinks "-" is a resource deletion
  scrubbed_output.gsub!(/^- .*\.\.\.$/, '')
  # Remove separation lines that appear after refreshing state
  scrubbed_output.gsub!(/^-+$/, '')
  # Remove preface
  if (match = scrubbed_output.match(/^Path:[^\n]+/))
    scrubbed_output = scrubbed_output[match.end(0)..-1]
  elsif (match = scrubbed_output.match(/^Terraform.+following\sactions:/))
    scrubbed_output = scrubbed_output[match.end(0)..-1]
  elsif (match = scrubbed_output.match(/^\s*(~|\+|\-)/))
    scrubbed_output = scrubbed_output[match.begin(0)..-1]
  elsif scrubbed_output =~ /^(No changes|This plan does nothing)/
    @output.puts 'No changes'
    return
  else
    raise ParseError, 'Output does not contain proper preface'
  end
  # Remove postface
  if (match = scrubbed_output.match(/^Plan:[^\n]+/))
    plan_summary = scrubbed_output[match.begin(0)..match.end(0)]
    scrubbed_output = scrubbed_output[0...match.begin(0)]
  end
  plan = TerraformPlan.from_output(scrubbed_output)
  plan.display(@output)
  @output.puts plan_summary
end