codeforamerica/michigan-benefits

class Dhs1171Pdf
  PDF_DIRECTORY = "app/lib/pdfs".freeze
  SOURCE_PDF = "#{PDF_DIRECTORY}/DHS_1171.pdf".freeze
  COVERSHEET_PDF = "#{PDF_DIRECTORY}/DHS_1171_cover_letter.pdf".freeze
  MAXIMUM_HOUSEHOLD_MEMBERS = 6
  MAXIMUM_EMPLOYED_MEMBERS = 2
  MAXIMUM_SELF_EMPLOYED_MEMBERS = 2

  def initialize(snap_application:)
    @snap_application = snap_application
  end

  def completed_file
    complete_template_pdf_with_client_data
    assemble_complete_application(temp_pdf_files)
  ensure
    temp_pdf_files.map do |t|
      t.close
      t.unlink
    end
  end

  private

  attr_reader :snap_application

  def temp_pdf_files
    @_temp_pdf_files ||= [
      filled_in_application,
      additional_household_member_pages,
      additional_employed_pages,
      additional_self_employed_pages,
      verification_documents,
    ].reject(&:blank?).flatten
  end

  def complete_template_pdf_with_client_data
    PdfForms.new.fill_form(SOURCE_PDF, filled_in_application.path, client_data)
  end

  def assemble_complete_application(filled_in_pdfs)
    PdfBuilder.new(
      output_file: complete_application_with_cover_and_documents,
      files: [File.open(COVERSHEET_PDF)] + filled_in_pdfs,
    ).pdf
  end

  def complete_application_with_cover_and_documents
    @_complete_application_with_cover_and_documents ||=
      Tempfile.new(["snap_app_with_cover_and_documents", ".pdf"], "tmp/")
  end

  def filled_in_application
    @_filled_in_application ||= Tempfile.new(["snap_app", ".pdf"], "tmp/")
  end

  def additional_household_member_pages
    if application_members.length > MAXIMUM_HOUSEHOLD_MEMBERS
      SnapApplicationExtraMemberPdf.new(
        members: additional_members,
        attributes_class: ExtraMemberAttributes,
        title: "Section C Continued",
      ).completed_file
    end
  end

  def additional_employed_pages
    if employed_members.length > MAXIMUM_EMPLOYED_MEMBERS
      SnapApplicationExtraMemberPdf.new(
        members: additional_employed_members,
        attributes_class: ExtraEmployedMemberAttributes,
        title: "Section M Continued",
      ).completed_file
    end
  end

  def additional_self_employed_pages
    if self_employed_members.length > MAXIMUM_SELF_EMPLOYED_MEMBERS
      SnapApplicationExtraMemberPdf.new(
        members: additional_self_employed_members,
        attributes_class: ExtraSelfEmployedMemberAttributes,
        title: "Section L Continued",
      ).completed_file
    end
  end

  def verification_documents
    snap_application.documents.map do |document|
      VerificationDocument.new(
        url: document,
        benefit_application: snap_application,
      ).output_file
    end.reject { |document| document.path.nil? }
  end

  def client_data
    snap_application_attributes.
      merge(member_attributes).
      merge(employed_member_attributes).
      merge(self_employed_member_attributes).
      merge(additional_income_attributes)
  end

  def snap_application_attributes
    SnapApplicationAttributes.new(snap_application: snap_application).to_h
  end

  def member_attributes
    map_attributes(
      records: first_six_members,
      klass: SnapApplicationMemberAttributes,
    )
  end

  def employed_member_attributes
    map_attributes(
      records: first_two_employed_members,
      klass: EmployedMemberAttributes,
    )
  end

  def self_employed_member_attributes
    map_attributes(
      records: first_two_self_employed_members,
      klass: SelfEmployedMemberAttributes,
    )
  end

  def additional_income_attributes
    if additional_income_source.length <= 3
      first_three_additional_income_sources.map do |attrs|
        if attrs[:source].present?
          AdditionalIncomeSourceAttributes.new(attrs).to_h
        end
      end.compact.reduce({}, :merge)
    else
      { more_than_three_additional_income_sources: "See appended page" }
    end
  end

  def map_attributes(records:, klass:)
    records.map do |record|
      if record[:member].present?
        klass.new(record).to_h
      end
    end.compact.reduce({}, :merge)
  end

  def additional_members
    application_members[6..-1]
  end

  def additional_employed_members
    employed_members[2..-1]
  end

  def additional_self_employed_members
    self_employed_members[2..-1]
  end

  def first_six_members
    [
      { member: application_members[0], position: "primary" },
      { member: application_members[1], position: "second" },
      { member: application_members[2], position: "third" },
      { member: application_members[3], position: "fourth" },
      { member: application_members[4], position: "fifth" },
      { member: application_members[5], position: "sixth" },
    ]
  end

  def first_two_employed_members
    [
      { member: employed_members[0], position: "first" },
      { member: employed_members[1], position: "second" },
    ]
  end

  def first_two_self_employed_members
    [
      { member: self_employed_members[0], position: "first" },
      { member: self_employed_members[1], position: "second" },
    ]
  end

  def first_three_additional_income_sources
    [
      {
        source: additional_income_source[0],
        position: "first",
        snap_application: snap_application,
      },
      {
        source: additional_income_source[1],
        position: "second",
        snap_application: snap_application,
      },
      {
        source: additional_income_source[2],
        position: "third",
        snap_application: snap_application,
      },
    ]
  end

  def employed_members
    @_employed_members ||=
      application_members.where(employment_status: "employed")
  end

  def self_employed_members
    @_self_employed_members ||=
      application_members.where(employment_status: "self_employed")
  end

  def additional_income_source
    @_additional_income_source ||= snap_application.additional_income
  end

  def application_members
    @_application_members ||= snap_application.members.order(:id)
  end
end