module WahWah

# File lib/wahwah.rb, line 62
def self.open(file_path)
  file_path = file_path.to_path if file_path.respond_to? :to_path
  file_path = file_path.to_str

  file_format = Helper.file_format(file_path)

  raise WahWahArgumentError, 'File is not exists' unless File.exist? file_path
  raise WahWahArgumentError, 'File is unreadable' unless File.readable? file_path
  raise WahWahArgumentError, 'File is empty' unless File.size(file_path) > 0
  raise WahWahArgumentError, 'No supported format found' unless support_formats.include? file_format

  FORMATE_MAPPING.each do |tag, formats|
    break const_get(tag).new(file_path) if formats.include?(file_format)
  end
end

# File lib/wahwah.rb, line 78
def self.support_formats
  FORMATE_MAPPING.values.flatten
end