scinote-web/app/services/storage_locations/import_service.rb

# frozen_string_literal: true

require 'caxlsx'

module StorageLocations
  class ImportService
    def initialize(storage_location, file, user)
      @storage_location = storage_location
      @assigned_count = 0
      @unassigned_count = 0
      @updated_count = 0
      @sheet = SpreadsheetParser.open_spreadsheet(file)
      @user = user
    end

    def import_items
      @rows = SpreadsheetParser.spreadsheet_enumerator(@sheet).reject { |r| r.all?(&:blank?) }

      # Check if the file has proper headers
      header = SpreadsheetParser.parse_row(@rows[0], @sheet)
      return { status: :error, message: I18n.t('storage_locations.show.import_modal.errors.invalid_structure') } unless header[0] == 'Box position' && header[1] == 'Item ID'

      parse_rows!

      # Check duplicate positions in the file
      if @storage_location.with_grid? && @rows.pluck(:position).uniq.length != @rows.length
        return { status: :error, message: I18n.t('storage_locations.show.import_modal.errors.invalid_position') }
      end

      ActiveRecord::Base.transaction do
        unassign_repository_rows!

        @rows.each do |row|
          if @storage_location.with_grid? && !position_valid?(row[:position])
            @error_message = I18n.t('storage_locations.show.import_modal.errors.invalid_position')
            raise ActiveRecord::RecordInvalid
          end

          unless RepositoryRow.exists?(row[:repository_row_id])
            @error_message = I18n.t('storage_locations.show.import_modal.errors.invalid_item', row_id: row[:repository_row_id])
            raise ActiveRecord::RecordNotFound
          end

          import_row!(row)
        end
      end

      { status: :ok, assigned_count: @assigned_count, unassigned_count: @unassigned_count, updated_count: @updated_count }
    rescue ActiveRecord::RecordNotFound, ActiveRecord::RecordInvalid
      { status: :error, message: @error_message }
    end

    private

    def parse_rows!
      # Remove first row
      @rows.shift

      @rows.map! do |r|
        row = SpreadsheetParser.parse_row(r, @sheet)
        {
          position: convert_position_letter_to_number(row[0]),
          repository_row_id: row[1].gsub('IT', '').to_i
        }
      end
    end

    def import_row!(row)
      storage_location_repository_row =
        @storage_location.storage_location_repository_rows
                         .find_or_initialize_by(
                           repository_row_id: row[:repository_row_id],
                           metadata: { position: row[:position] }
                         )

      @assigned_count += 1 if storage_location_repository_row.new_record?

      storage_location_repository_row.update!(
        repository_row_id: row[:repository_row_id],
        created_by: storage_location_repository_row.created_by || @user
      )
    end

    def unassign_repository_rows!
      @storage_location.storage_location_repository_rows.each do |s|
        if @rows.exclude?({ position: s.metadata['position'], repository_row_id: s.repository_row_id })
          @unassigned_count += 1
          s.discard
        end
      end
    end

    def position_valid?(position)
      position[0].to_i <= @storage_location.grid_size[0].to_i && position[1].to_i <= @storage_location.grid_size[1].to_i
    end

    def convert_position_letter_to_number(position)
      return unless position

      column_letter = position[0]
      row_number = position[1]

      [column_letter.ord - 64, row_number.to_i]
    end
  end
end