class Hizuke::Parser

def self.parse(text)
  new.parse(text)
end

def parse(text)
  # Check if text is nil or empty
  raise ParseError, "Input text cannot be nil or empty" if text.nil? || text.empty?
  # Split the text into words
  words = text.split
  # Find the first date keyword
  date_word_index = nil
  date_offset = nil
  words.each_with_index do |word, index|
    clean_word = word.downcase.gsub(/[^a-z]/, '')
    if DATE_KEYWORDS.key?(clean_word)
      date_word_index = index
      date_offset = DATE_KEYWORDS[clean_word]
      break
    end
  end
  if date_word_index.nil?
    raise ParseError, "No valid date reference found in '#{text}'"
  end
  # Calculate the date based on the keyword
  date = Date.today + date_offset
  # Create the clean text by removing the date keyword
  clean_words = words.dup
  clean_words.delete_at(date_word_index)
  clean_text = clean_words.join(" ").strip
  Result.new(clean_text, date)
end