import_visualise.rb

require "pry"
require "csv"

class GenerateCsvSummary
  NUMBER_OF_ROWS = 10
  GENERATED_FILE_PATH = "./csv_summary.csv"

  def initialize(absolute_directory_path)
    @absolute_directory_path = absolute_directory_path
  end

  def call
    create_empty_output_file
    Dir.foreach(@absolute_directory_path) do |filename|
      next unless File.extname(filename) == ".csv"
      EncodeFile.new("#{@absolute_directory_path}/#{filename}").call
      AddFileRows.new("#{@absolute_directory_path}/#{filename}", GENERATED_FILE_PATH, NUMBER_OF_ROWS).call
    end
  end

  def create_empty_output_file
    FileUtils.touch(GENERATED_FILE_PATH)
    File.open(GENERATED_FILE_PATH, "w") { |file| file.truncate(0) }
  end
end

class EncodeFile
  def initialize(csv_file_path)
    @csv_file_path = csv_file_path
    @output = "#{@csv_file_path}x"
  end

  def call
    text = File.read(@csv_file_path)
    text_without_invalid = text.encode("UTF-8", invalid: :replace, replace: " ")
    File.write(@csv_file_path, text_without_invalid)
  end
end

class AddFileRows
  def initialize(csv_file_path, generated_file_path, number_of_rows)
    @csv_file_path = csv_file_path
    @generated_file_path = generated_file_path
    @number_of_rows = number_of_rows
  end

  def call
    CSV.open(@generated_file_path, "a+") do |csv|
      csv << []
      csv << []
      csv << [File.basename(@csv_file_path, ".csv")]
      csv << rows.first.headers
      rows.each do |row|
        csv << row
      end
    end
  end

  def rows
    rows = CSV.open(@csv_file_path, "r", col_sep: ",", headers: true) { |csv| csv.first(@number_of_rows) }
  end
end

GenerateCsvSummary.new("/Users/piotr/Downloads/jazzhr").call