class Import::GoogleCodeController < Import::BaseController
  before_action :verify_google_code_import_enabled
  before_action :user_map, only: [:new_user_map, :create_user_map]

  def new
  end

  def callback
    dump_file = params[:dump_file]

    unless dump_file.respond_to?(:read)
      return redirect_back_or_default(options: { alert: "You need to upload a Google Takeout archive." })
    end

    begin
      dump = JSON.parse(dump_file.read)
    rescue
      return redirect_back_or_default(options: { alert: "The uploaded file is not a valid Google Takeout archive." })
    end

    client = Gitlab::GoogleCodeImport::Client.new(dump)
    unless client.valid?
      return redirect_back_or_default(options: { alert: "The uploaded file is not a valid Google Takeout archive." })
    end

    session[:google_code_dump] = dump

    if params[:create_user_map] == "1"
      redirect_to new_user_map_import_google_code_path
    else
      redirect_to status_import_google_code_path
    end
  end

  def new_user_map
  end

  def create_user_map
    user_map_json = params[:user_map]
    user_map_json = "{}" if user_map_json.blank?

    begin
      user_map = JSON.parse(user_map_json)
    rescue
      flash.now[:alert] = "The entered user map is not a valid JSON user map."

      return render "new_user_map"
    end

    unless user_map.is_a?(Hash) && user_map.all? { |k, v| k.is_a?(String) && v.is_a?(String) }
      flash.now[:alert] = "The entered user map is not a valid JSON user map."

      return render "new_user_map"
    end

    # This is the default, so let's not save it into the database.
    user_map.reject! do |key, value|
      value == Gitlab::GoogleCodeImport::Client.mask_email(key)
    end

    session[:google_code_user_map] = user_map

    flash[:notice] = "The user map has been saved. Continue by selecting the projects you want to import."

    redirect_to status_import_google_code_path
  end

  # rubocop: disable CodeReuse/ActiveRecord
  def status
    unless client.valid?
      return redirect_to new_import_google_code_path
    end

    @repos = client.repos
    @incompatible_repos = client.incompatible_repos

    @already_added_projects = find_already_added_projects('google_code')
    already_added_projects_names = @already_added_projects.pluck(:import_source)

    @repos.reject! { |repo| already_added_projects_names.include? repo.name }
  end
  # rubocop: enable CodeReuse/ActiveRecord

  def jobs
    render json: find_jobs('google_code')
  end

  def create
    repo = client.repo(params[:repo_id])
    user_map = session[:google_code_user_map]

    project = Gitlab::GoogleCodeImport::ProjectCreator.new(repo, current_user.namespace, current_user, user_map).execute

    if project.persisted?
      render json: ProjectSerializer.new.represent(project)
    else
      render json: { errors: project_save_error(project) }, status: :unprocessable_entity
    end
  end

  private

  def client
    @client ||= Gitlab::GoogleCodeImport::Client.new(session[:google_code_dump])
  end

  def verify_google_code_import_enabled
    render_404 unless google_code_import_enabled?
  end

  def user_map
    @user_map ||= begin
      user_map = client.user_map

      stored_user_map = session[:google_code_user_map]
      user_map.update(stored_user_map) if stored_user_map

      Hash[user_map.sort]
    end
  end
end