require 'roo'

class ReportParser
  def initialize(yearly_file)
    @yearly_file = yearly_file
  end

  def call
    ActiveRecord::Base.transaction do
      ReportParsers::OrganizationInfoParser.new(@yearly_file, spreadsheet: spreadsheet).call

      form_11_data = ReportParsers::Form11Parser.new(@yearly_file, spreadsheet: spreadsheet).call
      form_12_data = ReportParsers::Form12Parser.new(@yearly_file, spreadsheet: spreadsheet).call
      form_14_data = ReportParsers::Form14Parser.new(@yearly_file, spreadsheet: spreadsheet).call

      save_form_statements(form_11_data, 1) # 1 - Бух. баланс
      save_form_statements(form_12_data, 2) # 2 - Отчет о фин. результатах
      save_form_statements(form_14_data, 4) # 4 - Отчет о движении денежных средств
    end
  end

  private

  def spreadsheet
    @spreadsheet ||= begin
      tempfile = Tempfile.new(['report', '.xlsx'])
      tempfile.binmode
      @yearly_file.file.download { |chunk| tempfile.write(chunk) }
      tempfile.rewind
      Roo::Excelx.new(tempfile.path)
    end
  end

  def save_form_statements(form_data, form_id)
    document_type = DocumentType.find_by(id: form_id)
    raise "DocumentType with id=#{form_id} not found!" unless document_type

    form_data.each do |year, data|
      rows = data[:rows] || data['rows'] || []
      next if rows.blank?

      statement = find_or_build_statement(document_type, year)
      payload = {
        data_year: year,
        rows: rows
      }
      statement.assign_attributes(data: payload)
      statement.save!
    end
  end

  def find_or_build_statement(document_type, year)
    existing = FinancialStatement
               .joins(:yearly_file)
               .where(document_type: document_type, sheet_number: year)
               .where(yearly_files: { organization_id: @yearly_file.organization_id })
               .order('yearly_files.year DESC NULLS LAST, financial_statements.updated_at DESC')
               .first

    return existing if existing

    @yearly_file.financial_statements.new(document_type: document_type, sheet_number: year)
  end
end