#!/usr/bin/env ruby

require 'bundler/inline'
require 'optparse'
require 'yaml'

gemfile do
  source 'https://rubygems.org'
  ruby '>= 2.5'
  gem 'aipp', '~> 0'
end

class Executable
  attr_reader :fir, :aip, :airac, :ofm, :limit, :verbose

  def initialize
    @ogn = false
    @airac = AIPP::AIRAC.new(Date.today).date
    @limit = Float::INFINITY
    @verbose = false
    OptionParser.new do |o|
      o.banner = <<~END
        Download online AIP and convert it to AIXM.
        Usage: #{File.basename($0)} [options]
      END
      o.on('-A', '--about', 'author and license information') { puts 'Written by Sven Schwyn (bitcetera.com) and distributed under MIT license.'; exit }
      o.on('-l', '--list', "list available FIR/AIP and exit") { puts AIPP::Loader.list.to_yaml; exit }
      o.on('-f', '--fir STRING', String, 'FIR (flight information region, e.g. "LF")') { |v| @fir = v }
      o.on('-a', '--aip STRING', String, 'AIP (aeronautical information publication, e.g. "ENR-5.1")') { |v| @aip = v }
      o.on('-d', '--airac DATE', String, 'AIRAC date (e.g. "2018-01-04", default: current)') { |v| @airac = v }
      o.on('-o', '--[no-]ofm', 'Use OFM extensions (default: false)') { |v| @ofm = v }
      o.on('-L', '--limit INTEGER', Integer, 'Stop conversion after this many features') { |v| @limit = v }
      o.on('-D', '--[no-]debug', 'Enable debug mode (default: false)') { |v| $DEBUG = v }
      o.on('-v', '--[no-]verbose', 'Verbose error reporting (default: false)') { |v| @verbose = v }
    end.parse!
    fail(ArgumentError, "FIR must be supplied") unless @fir
    fail(ArgumentError, "AIP must be supplied") unless @aip
    fail(ArgumentError, "AIRAC date must be supplied") unless @airac
  end

  def run
    extensions = [(:ofm if ofm)].compact
    filename = [fir, aip, airac].join('_') + '.aixm'
    loader = AIPP::Loader.new(fir: fir, aip: aip, airac: airac, limit: limit)
    aixm = loader.aixm.to_aixm(*extensions)
    File.write(Pathname.new(Dir.pwd).join(filename), aixm)
  end
end

begin
  executable = Executable.new
  executable.run
rescue => exception
  if executable&.verbose
    raise exception
  else
    puts "#{File.basename($0)}: #{exception.message}"
    exit 1
  end
end