sanger/limber

# frozen_string_literal: true

require './lib/nested_validation'
require 'csv'

module LabwareCreators # rubocop:todo Style/Documentation
  require_dependency 'labware_creators/custom_pooled_tubes'

  # Takes the user uploaded csv file and extracts the pool information
  # Also validates the content of the CSV file.
  class CustomPooledTubes::CsvFile < CommonFileHandling::CsvFileBase
    validates :header_row, presence: true
    validates_nested :header_row
    validates_nested :transfers, if: :correctly_formatted?

    delegate :source_column, :destination_column, :volume_column, to: :header_row

    #
    # Extracts pool information from the uploaded csv file
    #
    # @return [Hash] { "1" => [ "A1", "B1" ] }
    # where "1" is just an identifier for the pool
    #   - it comes from the 'destination_well' column in the file
    # and 'A1' and 'B1' are the coordiates of the source wells to go into that pool
    #
    def pools
      @pools ||= generate_pools_hash
    end

    # Returns the contents of the header row
    def header_row
      @header_row ||= Header.new(@data[0]) if @data[0]
    end

    private

    def transfers
      @transfers ||= @data[1..].each_with_index.map { |row_data, index| Row.new(header_row, index + 2, row_data) }
    end

    # Gates looking for wells if the file is invalid
    def correctly_formatted?
      @parsed && header_row.valid?
    end

    def generate_pools_hash
      return {} unless valid?

      pools = Hash.new { |hash, pool_name| hash[pool_name] = [] }
      transfers.each do |row|
        next if row.empty?

        pools[row.destination] << row.source
      end
      pools
    end
  end
end