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

      merge_financial_statements(form_11_data, form_12_data)
    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 merge_financial_statements(form_11_data, form_12_data)
    document_type = DocumentType.find_or_create_by!(name: 'Финансовые данные')

    all_years = (form_11_data.keys + form_12_data.keys).uniq

    all_years.each do |year|
      statement = find_or_build_statement(document_type, year)

      all_rows = []

      if form_11_data[year].present?
        form_11_rows = form_11_data[year][:rows] || form_11_data[year]['rows'] || []
        all_rows.concat(form_11_rows)
      end

      if form_12_data[year].present?
        form_12_rows = form_12_data[year][:rows] || form_12_data[year]['rows'] || []
        all_rows.concat(form_12_rows)
      end

      if all_rows.present?
        payload = {
          data_year: year,
          rows: all_rows
        }

        statement.assign_attributes(data: payload)
        statement.save!
      end
    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