module ProtocolsImporter
  include RenamingUtil

  def import_new_protocol(protocol_json, team, type, user)
    remove_empty_inputs(protocol_json)
    protocol = Protocol.new(
      name: protocol_json["name"],
      description: protocol_json["description"],
      authors: protocol_json["authors"],
      protocol_type: (type == :public ? :in_repository_public : :in_repository_private),
      published_on: (type == :public ? Time.now : nil),
      added_by: user,
      team: team
    )

    # Try to rename record
    if protocol.invalid? then
      rename_record(protocol, :name)
    end

    # Okay, now save the protocol
    protocol.save!

    # Protocol is saved, populate it
    populate_protocol(protocol, protocol_json, user, team)

    return protocol
  end

  def import_into_existing(protocol, protocol_json, user, team)
    # Firstly, destroy existing protocol's contents
    protocol.destroy_contents(user)
    protocol.reload

    # Alright, now populate the protocol
    populate_protocol(protocol, protocol_json, user, team)
    protocol.reload

    # Unlink the protocol
    protocol.unlink
    protocol
  end

  private

  def populate_protocol(protocol, protocol_json, user, team)
    protocol.reload
    asset_ids = []
    step_pos = 0
    # Check if protocol has steps
    if protocol_json['steps']
      protocol_json['steps'].values.each do |step_json|
        step = Step.create!(
          name: step_json['name'],
          position: step_pos,
          completed: false,
          user: user,
          last_modified_by: user,
          protocol: protocol
        )
        # need step id to link image to step
        step.description = populate_rte(step_json, step, team)
        step.save!
        step_pos += 1

        if step_json["checklists"]
          step_json["checklists"].values.each do |checklist_json|
            checklist = Checklist.create!(
              name: checklist_json["name"],
              step: step,
              created_by: user,
              last_modified_by: user
            )
            if checklist_json["items"]
              item_pos = 0
              checklist_json["items"].values.each do |item_json|
                item = ChecklistItem.create!(
                  text: item_json["text"],
                  checked: false,
                  position: item_pos,
                  created_by: user,
                  last_modified_by: user,
                  checklist: checklist
                )
                item_pos += 1
              end
            end
          end
        end

        if step_json['tables']
          step_json['tables'].values.each do |table_json|
            table = Table.create!(
              name: table_json['name'],
              contents: Base64.decode64(table_json['contents']),
              created_by: user,
              last_modified_by: user,
              team: team
            )
            StepTable.create!(
              step: step,
              table: table
            )
          end
        end

        if step_json["assets"]
          step_json["assets"].values.each do |asset_json|
            asset = Asset.new(
              created_by: user,
              last_modified_by: user,
              team: team
            )

            # Decode the file bytes
            asset.file = StringIO.new(Base64.decode64(asset_json["bytes"]))
            asset.file_file_name = asset_json["fileName"]
            asset.file_content_type = asset_json["fileType"]
            asset.save!
            asset_ids << asset.id

            StepAsset.create!(
              step: step,
              asset: asset
            )
          end
        end
      end
    end

    # Post process assets
    asset_ids.each do |asset_id|
      Asset.find(asset_id).post_process_file(protocol.team)
    end
  end

  def remove_empty_inputs(obj)
    obj.keys.each do |key|
      if obj[key] == ""
        obj[key] = nil
      elsif obj[key].kind_of? Hash
        # Recursive call
        remove_empty_inputs(obj[key])
      end
    end
  end

  # create tiny_mce assets and change the inport tokens
  def populate_rte(step_json, step, team)
    return populate_rte_legacy(step_json) unless step_json['descriptionAssets']
    description = step_json['description']
    step_json['descriptionAssets'].values.each do |tiny_mce_img_json|
      tiny_mce_img = TinyMceAsset.new(
        reference: step,
        team_id: team.id
      )
      # Decode the file bytes
      tiny_mce_img.image = StringIO.new(
        Base64.decode64(tiny_mce_img_json['bytes'])
      )
      tiny_mce_img.image_content_type = tiny_mce_img_json['fileType']
      tiny_mce_img.save!
      description.gsub!("[~tiny_mce_id:#{tiny_mce_img_json['tokenId']}]",
                        "[~tiny_mce_id:#{tiny_mce_img.id}]")

    end
    description
  end

  # handle import from legacy exports
  def populate_rte_legacy(step_json)
    return unless step_json['description'] && step_json['description'].present?
    step_json['description'].gsub(/\[~tiny_mce_id:([0-9a-zA-Z]+)\]/, '')
  end
end