class Import::CSVData

# File app/models/import/csv_data.rb, line 7
def initialize(data)
  @data = data
end

# File app/models/import/csv_data.rb, line 28
  def count = csv_table&.count || 0

  def records(&block)
    remove_trailing_blank_rows
      .then { |rows| has_instruction_row? ? rows.drop(1) : rows }
      .each(&block)
  end

  def has_instruction_row?
    csv_table&.first&.[](0)&.to_s&.match?(/\A(Required|Optional)([,.:]|$)/)
  end

  private

  def remove_trailing_blank_rows
    found_values = false

    # map(&:itself) because CSV::Table doesn't have a reverse method
    rows_in_reverse_order = csv_table.map(&:itself).reverse

    filtered_rows =
      rows_in_reverse_order.select do |row|
        if found_values
          true
        elsif row.fields.all?(&:blank?)
          false
        else
          found_values = true
          true
        end
      end

    filtered_rows.reverse
  end
end

# File app/models/import/csv_data.rb, line 18
def csv_table
  @csv_table ||=
    begin
      CSVParser.call(data) if data.present?
    rescue CSV::MalformedCSVError
      @malformed = true
      nil
    end
end

# File app/models/import/csv_data.rb, line 16
def empty? = csv_table.blank?

def csv_table
  @csv_table ||=
    begin
      CSVParser.call(data) if data.present?
    rescue CSV::MalformedCSVError
      @malformed = true
      nil
    end
end

def count = csv_table&.count || 0

def records(&block)
  remove_trailing_blank_rows
    .then { |rows| has_instruction_row? ? rows.drop(1) : rows }
    .each(&block)
end

def has_instruction_row?
  csv_table&.first&.[](0)&.to_s&.match?(/\A(Required|Optional)([,.:]|$)/)
end

private

def remove_trailing_blank_rows
  found_values = false

  # map(&:itself) because CSV::Table doesn't have a reverse method
  rows_in_reverse_order = csv_table.map(&:itself).reverse

  filtered_rows =
    rows_in_reverse_order.select do |row|
      if found_values
        true
      elsif row.fields.all?(&:blank?)
        false
      else
        found_values = true
        true
      end
    end

  filtered_rows.reverse
end

# File app/models/import/csv_data.rb, line 36
def has_instruction_row?
  csv_table&.first&.[](0)&.to_s&.match?(/\A(Required|Optional)([,.:]|$)/)
end

# File app/models/import/csv_data.rb, line 30
def records(&block)
  remove_trailing_blank_rows
    .then { |rows| has_instruction_row? ? rows.drop(1) : rows }
    .each(&block)
end

# File app/models/import/csv_data.rb, line 42
def remove_trailing_blank_rows
  found_values = false

  # map(&:itself) because CSV::Table doesn't have a reverse method
  rows_in_reverse_order = csv_table.map(&:itself).reverse

  filtered_rows =
    rows_in_reverse_order.select do |row|
      if found_values
        true
      elsif row.fields.all?(&:blank?)
        false
      else
        found_values = true
        true
      end
    end

  filtered_rows.reverse
end

# File app/models/import/csv_data.rb, line 11
def well_formed?
  csv_table
  !malformed
end