class Fastlane::Actions::SetChangelogAction

def self.run(params)
  require 'spaceship'
  Spaceship::Tunes.login(params[:username])
  app = Spaceship::Application.find(params[:app_identifier])
  version_number = params[:version]
  unless version_number
    # Automatically fetch the latest version
    Helper.log.info "Fetching the latest version for this app"
    if app.edit_version and app.edit_version.version
      version_number = app.edit_version.version
    else
      Helper.log.info "You have to specify a new version number: "
      version_number = STDIN.gets.strip
    end
  end
  Helper.log.info "Going to update version #{version_number}"
  changelog = params[:changelog]
  unless changelog
    path = "./fastlane/changelog.txt"
    Helper.log.info "Looking for changelog in '#{path}'..."
    if File.exist? path
      changelog = File.read(path)
    else
      Helper.log.error "Couldn't find changelog.txt"
      Helper.log.info "Please enter the changelog here:"
      changelog = STDIN.gets
    end
  end
  Helper.log.info "Going to update the changelog to:\n\n#{changelog}\n\n"
  if (v = app.edit_version)
    if v.version != version_number
      # Version is already there, make sure it matches the one we want to create
      Helper.log.info "Changing existing version number from '#{v.version}' to '#{version_number}'"
      v.version = version_number
      v.save!
    else
      Helper.log.info "Updating changelog for existing version #{v.version}"
    end
  else
    Helper.log.info "Creating the new version: #{version_number}"
    app.create_version!(version_number)
    app = Spaceship::Application.find(params[:app_identifier]) # Replace with .reload method once available
    v = app.edit_version
  end
  v.release_notes.languages.each do |lang|
    v.release_notes[lang] = changelog
  end
  Helper.log.info "Uploading changes to iTunes Connect..."
  v.save!
  Helper.log.info "👼 Successfully pushed the new changelog to #{v.url}".green
end