class AttestationTemplate < ApplicationRecord
  include ActionView::Helpers::NumberHelper

  belongs_to :procedure

  mount_uploader :logo, AttestationTemplateImageUploader
  mount_uploader :signature, AttestationTemplateImageUploader

  validate :logo_signature_file_size
  validates :footer, length: { maximum: 190 }

  FILE_MAX_SIZE_IN_MB = 0.5

  def tags
    if procedure.for_individual?
      identity_tags = individual_tags
    else
      identity_tags = entreprise_tags + etablissement_tags
    end

    identity_tags + dossier_tags + procedure_type_de_champ_public_private_tags
  end

  def attestation_for(dossier)
    Attestation.new(title: replace_tags(title, dossier), pdf: build_pdf(dossier))
  end

  def dup
    result = AttestationTemplate.new(title: title, body: body, footer: footer, activated: activated)

    if logo.present?
      CopyCarrierwaveFile::CopyFileService.new(self, result, :logo).set_file
    end

    if signature.present?
      CopyCarrierwaveFile::CopyFileService.new(self, result, :signature).set_file
    end

    result
  end

  private

  def logo_signature_file_size
    %i[logo signature]
      .select { |file_name| send(file_name).present? }
      .each { |file_name| file_size_check(file_name) }
  end

  def file_size_check(file_name)
    if send(file_name).file.size.to_f > FILE_MAX_SIZE_IN_MB.megabyte.to_f
      errors.add(file_name, " : vous ne pouvez pas charger une image de plus de #{number_with_delimiter(FILE_MAX_SIZE_IN_MB, locale: :fr)} Mo")
    end
  end

  def procedure_type_de_champ_public_private_tags
    (procedure.types_de_champ + procedure.types_de_champ_private)
      .map { |tdc| { libelle: tdc.libelle, description: tdc.description } }
  end

  def dossier_tags
    [{ libelle: 'motivation', description: '', target: 'motivation' }]
  end

  def individual_tags
    [{ libelle: 'civilité', description: 'M., Mme', target: 'gender' },
     { libelle: 'nom', description: "nom de l'usager", target: 'nom' },
     { libelle: 'prénom', description: "prénom de l'usager", target: 'prenom' }]
  end

  def entreprise_tags
    [{ libelle: 'SIREN', description: '', target: 'siren' },
     { libelle: 'numéro de TVA intracommunautaire', description: '', target: 'numero_tva_intracommunautaire' },
     { libelle: 'SIRET du siège social', description: '', target: 'siret_siege_social' },
     { libelle: 'raison sociale', description: '', target: 'raison_sociale' }]
  end

  def etablissement_tags
    [{ libelle: 'adresse', description: '', target: 'inline_adresse' }]
  end

  def build_pdf(dossier)
    action_view = ActionView::Base.new(ActionController::Base.view_paths,
      logo: logo,
      title: replace_tags(title, dossier),
      body: replace_tags(body, dossier),
      signature: signature,
      footer: footer,
      created_at: Time.now)

    attestation_view = action_view.render(file: 'admin/attestation_templates/show',
      formats: [:pdf])

    view_to_memory_file(attestation_view)
  end

  def view_to_memory_file(view)
    pdf = StringIO.new(view)

    def pdf.original_filename
      'attestation'
    end

    pdf
  end

  def replace_tags(text, dossier)
    if text.nil?
      return ''
    end

    text = replace_type_de_champ_tags(text, procedure.types_de_champ, dossier.champs)
    text = replace_type_de_champ_tags(text, procedure.types_de_champ_private, dossier.champs_private)

    tags_and_datas = [
      [dossier_tags, dossier],
      [individual_tags, dossier.individual],
      [entreprise_tags, dossier.entreprise],
      [etablissement_tags, dossier.entreprise&.etablissement]]

    tags_and_datas.inject(text) { |acc, (tags, data)| replace_tags_with_values_from_data(acc, tags, data) }
  end

  def replace_type_de_champ_tags(text, types_de_champ, dossier_champs)
    types_de_champ.inject(text) do |acc, tag|
      value = dossier_champs
        .select { |champ| champ.libelle == tag[:libelle] }
        .first
        .value

      acc.gsub("--#{tag[:libelle]}--", value.to_s)
    end
  end

  def replace_tags_with_values_from_data(text, tags, data)
    if data.present?
      tags.inject(text) do |acc, tag|
        acc.gsub("--#{tag[:libelle]}--", data.send(tag[:target].to_sym).to_s)
      end
    else
      text
    end
  end
end