class UpdateXktToVersion8 < ActiveRecord::Migration[6.1]
  SEEDED_MODEL_DATA = { 'Hospital - Architecture (cc-by-sa-3.0 Autodesk Inc.)' => 'hospital_architecture',
                        'Hospital - Structural (cc-by-sa-3.0 Autodesk Inc.)' => 'hospital_structural',
                        'Hospital - Mechanical (cc-by-sa-3.0 Autodesk Inc.)' => 'hospital_mechanical' }.freeze
  
  def up
    # Queue every IFC model for a new transformation.
    Rails.logger.info "Migrate all IFC models to the latest XKT version"

    if Bim::IfcModels::IfcModel.count.zero?
      Rails.logger.info("No IFC models to migrate")
      return
    end

    # Only report an error if you really need the IFC models to be converted. If the BIM edition is not active then
    # you don't need the IFC models to get converted and even more important, you don't need the full conversion
    # pipeline to be installed.
    unless ::OpenProject::Configuration.bim? && ::Bim::IfcModels::ViewConverterService.available?
      Rails.logger.error("Cannot convert IFC models. Some or all IFC conversion tools are not installed on your server.")
      return
    end

    migrate_all_ifc_models
    update_demo_xkt_models
  end

  def down
    # This migration is irreversible
  end

  private

  def migrate_all_ifc_models
    ::Bim::IfcModels::IfcModel.find_each do |ifc_model|
      cleanup_metadata_attachment(ifc_model)
      # We have seeded models that do not have an IFC attachment. They cannot get converted as an IFC file is
      # necessary.
      next if ifc_model.attachments.find_by(description: 'ifc').nil?

      ::Bim::IfcModels::IfcConversionJob.perform_later(ifc_model)
    end
  end

  def cleanup_metadata_attachment(ifc_model)
    ifc_model.attachments.find_by(description: 'metadata')&.destroy
  end

  def update_demo_xkt_models
    project = Project.find_by(identifier: 'demo-bcf-management-project')
    return unless project

    ifc_models = project.ifc_models.joins(:attachments)
                        .where("attachments.description LIKE 'xkt' AND ifc_models.title IN (?)",
                               SEEDED_MODEL_DATA.keys)

    ifc_models.each do |ifc_model|
      old_attachment = ifc_model.xkt_attachment
      next unless old_attachment

      attachment = Attachment.new(
        container: ifc_model,
        author: old_attachment.author,
        file: get_file(SEEDED_MODEL_DATA[ifc_model.title]),
        description: old_attachment.description
      )

      old_attachment.destroy
      attachment.save!
    end
  end

  def get_file(name)
    path = 'modules/bim/files/ifc_models/' + name + '/'
    file_name = name + '.xkt'
    return unless File.exist?(path + file_name)

    File.new(File.join(Rails.root,
                       path,
                       file_name))
  end
end