# frozen_string_literal: true

class RepositoriesExportJob < ApplicationJob
  include StringUtility

  def perform(repository_ids, user, team)
    @user = user
    @team = team
    @repositories = Repository.viewable_by_user(@user, @team).where(id: repository_ids).order(:id)
    zip_input_dir = FileUtils.mkdir_p(Rails.root.join("tmp/temp_zip_#{Time.now.to_i}")).first
    zip_dir = FileUtils.mkdir_p(Rails.root.join('tmp/zip-ready')).first

    zip_name = "inventories_export_#{Time.now.utc.strftime('%F_%H-%M-%S_UTC')}.zip"
    full_zip_name = File.join(zip_dir, zip_name)

    fill_content(zip_input_dir)
    ZipExport.transaction do
      @zip_export = ZipExport.create!(user: @user)
      @zip_export.zip!(zip_input_dir, full_zip_name)
      @zip_export.zip_file.attach(io: File.open(full_zip_name), filename: zip_name)
      generate_notification
    end
  ensure
    FileUtils.rm_rf([zip_input_dir, full_zip_name], secure: true)
  end

  private

  def fill_content(tmp_dir)
    # Create team dir
    team_path = "#{tmp_dir}/#{to_filesystem_name(@team.name)}"
    FileUtils.mkdir_p(team_path)
    @repositories.each_with_index do |repository, idx|
      save_repository_to_csv(team_path, repository, idx)
    end
  end

  def save_repository_to_csv(path, repository, idx)
    repository_name = "#{to_filesystem_name(repository.name)} (#{idx})"

    # Attachments dir
    relative_attachments_path = "#{repository_name} attachments"
    attachments_path = "#{path}/#{relative_attachments_path}"
    FileUtils.mkdir_p(attachments_path)

    # CSV file
    csv_file = FileUtils.touch("#{path}/#{repository_name}.csv").first

    # Define headers and columns IDs
    col_ids = [-3, -4, -5, -6, -7, -8] + repository.repository_columns.map(&:id)

    # Define callback function for file name
    assets = {}
    asset_counter = 0
    handle_name_func = lambda do |asset|
      file_name = append_file_suffix(asset.file_name, "_#{asset_counter}").to_s

      # Save pair for downloading it later
      assets[asset] = "#{attachments_path}/#{file_name}"

      asset_counter += 1
      relative_path = "#{relative_attachments_path}/#{file_name}"
      return "=HYPERLINK(\"#{relative_path}\", \"#{relative_path}\")"
    end

    # Generate CSV
    csv_data = RepositoryZipExport.to_csv(repository.repository_rows, col_ids, @user, repository, handle_name_func)
    File.binwrite(csv_file, csv_data)

    # Save all attachments (it doesn't work directly in callback function
    assets.each do |asset, asset_path|
      asset.file.open do |file|
        FileUtils.mv(file.path, asset_path)
      end
    end
  end

  def append_file_suffix(file_name, suffix)
    file_name = to_filesystem_name(file_name)
    ext = File.extname(file_name)
    File.basename(file_name, ext) + suffix + ext
  end

  def generate_notification
    notification = Notification.create!(
      type_of: :deliver,
      title: I18n.t('zip_export.notification_title'),
      message:  "<a data-id='#{@zip_export.id}' " \
                "data-turbolinks='false' " \
                "href='#{Rails.application
                              .routes
                              .url_helpers
                              .zip_exports_download_export_all_path(@zip_export)}'>" \
                "#{@zip_export.zip_file_name}</a>"
    )
    UserNotification.create!(notification: notification, user: @user)
  end
end