class PiecesJustificativesService
  def self.liste_documents(dossiers, for_expert)
    dossiers.flat_map do |dossier|
      pjs = pjs_for_champs(dossier, for_expert) +
        pjs_for_commentaires(dossier) +
        pjs_for_dossier(dossier, for_expert)

      pjs.map { |piece_justificative| ActiveStorage::DownloadableFile.pj_and_path(dossier, piece_justificative) }
    end
  end

  def self.serialize_types_de_champ_as_type_pj(revision)
    tdcs = revision.types_de_champ.filter { |type_champ| type_champ.old_pj.present? }
    tdcs.map.with_index do |type_champ, order_place|
      description = type_champ.description
      if /^(?<original_description>.*?)(?:[\r\n]+)Récupérer le formulaire vierge pour mon dossier : (?<lien_demarche>http.*)$/m =~ description
        description = original_description
      end
      {
        id: type_champ.old_pj[:stable_id],
        libelle: type_champ.libelle,
        description: description,
        order_place: order_place,
        lien_demarche: lien_demarche
      }
    end
  end

  def self.serialize_champs_as_pjs(dossier)
    dossier.champs.filter { |champ| champ.type_de_champ.old_pj }.map do |champ|
      {
        created_at: champ.created_at&.in_time_zone('UTC'),
        type_de_piece_justificative_id: champ.type_de_champ.old_pj[:stable_id],
        content_url: champ.for_api,
        user: champ.dossier.user
      }
    end
  end

  def self.clone_attachments(original, kopy)
    if original.is_a?(TypeDeChamp)
      clone_attachment(original.piece_justificative_template, kopy.piece_justificative_template)
    elsif original.is_a?(Procedure)
      clone_attachment(original.logo, kopy.logo)
      clone_attachment(original.notice, kopy.notice)
      clone_attachment(original.deliberation, kopy.deliberation)
    end
  end

  def self.clone_attachment(original_attachment, copy_attachment)
    if original_attachment.attached?
      original_attachment.open do |tempfile|
        copy_attachment.attach({
          io: File.open(tempfile.path),
          filename: original_attachment.filename,
          content_type: original_attachment.content_type,
          # we don't want to run virus scanner on cloned file
          metadata: { virus_scan_result: ActiveStorage::VirusScanner::SAFE }
        })
      end
    end
  end

  class FakeAttachment < Hashie::Dash
    property :filename
    property :name
    property :file
    property :id
    property :created_at

    def download
      file.read
    end

    def read(*args)
      file.read(*args)
    end

    def close
      file.close
    end

    def attached?
      true
    end

    def record_type
      'Fake'
    end
  end

  def self.generate_dossier_export(dossier)
    pdf = ApplicationController
      .render(template: 'dossiers/show', formats: [:pdf],
              assigns: {
                include_infos_administration: true,
                dossier: dossier
              })

    FakeAttachment.new(
      file: StringIO.new(pdf),
      filename: "export-#{dossier.id}.pdf",
      name: 'pdf_export_for_instructeur',
      id: dossier.id,
      created_at: dossier.updated_at
    )
  end

  private

  def self.pjs_for_champs(dossier, for_expert = false)
    champs = Champ
      .joins(:piece_justificative_file_attachment)
      .where(type: "Champs::PieceJustificativeChamp", dossier: dossier)

    if for_expert
      champs = champs.where(private: false)
    end

    ActiveStorage::Attachment
      .includes(:blob)
      .where(record_type: "Champ", record_id: champs.ids)
  end

  def self.pjs_for_commentaires(dossier)
    commentaires = Commentaire
      .joins(:piece_jointe_attachment)
      .where(dossier: dossier)

    ActiveStorage::Attachment
      .includes(:blob)
      .where(record_type: "Commentaire", record_id: commentaires.ids)
  end

  def self.pjs_for_dossier(dossier, for_expert = false)
    pjs = motivation(dossier) +
      attestation(dossier) +
      etablissement(dossier)

    if !for_expert
      pjs += operation_logs_and_signatures(dossier)
    end

    pjs
  end

  def self.etablissement(dossier)
    etablissement = Etablissement.where(dossier: dossier)

    ActiveStorage::Attachment
      .includes(:blob)
      .where(record_type: "Etablissement", record_id: etablissement)
  end

  def self.motivation(dossier)
    ActiveStorage::Attachment
      .includes(:blob)
      .where(record_type: "Dossier", name: "justificatif_motivation", record_id: dossier)
  end

  def self.attestation(dossier)
    attestation = Attestation
      .joins(:pdf_attachment)
      .where(dossier: dossier)

    ActiveStorage::Attachment
      .includes(:blob)
      .where(record_type: "Attestation", record_id: attestation)
  end

  def self.operation_logs_and_signatures(dossier)
    dol_ids_bill_id = DossierOperationLog
      .where(dossier: dossier)
      .pluck(:id, :bill_signature_id)

    dol_ids = dol_ids_bill_id.map(&:first)
    bill_ids = dol_ids_bill_id.map(&:second).uniq.compact

    serialized_dols = ActiveStorage::Attachment
      .includes(:blob)
      .where(record_type: "DossierOperationLog", record_id: dol_ids)

    bill_docs = ActiveStorage::Attachment
      .includes(:blob)
      .where(record_type: "BillSignature", record_id: bill_ids)

    serialized_dols + bill_docs
  end
end