class LicenseFinder::ErlangmkPackage

def all_parts_valid?
  dep_part_valid?(dep_parent) &&
    dep_part_valid?(dep_name) &&
    set?(dep_fetch_method) &&
    dep_repo_valid? &&
    dep_version_valid? &&
    set?(dep_absolute_path)
end

def dep_part_valid?(dep_part)
  set?(dep_part) &&
    word?(dep_part)
end

def dep_repo
  @dep_repo ||= dep_repo_unformatted
                .chomp('.git')
                .sub('git@github.com:', 'https://github.com/')
end

def dep_repo_valid?
  set?(dep_repo_unformatted) &&
    URI.parse(dep_repo)
end

def dep_version
  @dep_version ||= dep_version_unformatted.sub(version_prefix_re, '')
end

def dep_version_valid?
  return false unless set?(dep_version_unformatted)
  if dep_version&.match?(version_re)
    Gem::Version.correct?(dep_version)
  else
    dep_version =~ word_dot_re
  end
end

def initialize(dep_string_from_query_deps)
  @dep_parent,
  @dep_name,
  @dep_fetch_method,
  @dep_repo_unformatted,
  @dep_version_unformatted,
  @dep_absolute_path = dep_string_from_query_deps.split
  raise_invalid(dep_string_from_query_deps) unless all_parts_valid?
  super(
    dep_name,
    dep_version,
    homepage: dep_repo,
    install_path: dep_absolute_path
  )
end

def package_manager
  'Erlangmk'
end

def raise_invalid(dep_string)
  invalid_dep_message = "'#{dep_string}' does not look like a valid Erlank.mk dependency"
  valid_dep_example = "A valid dependency example: 'lager: goldrush git https://github.com/DeadZen/goldrush.git 0.1.9 /absolute/path/to/dep'"
  raise(InvalidErlangmkPackageError, "#{invalid_dep_message}. #{valid_dep_example}")
end

def set?(dep_part)
  !dep_part.nil? &&
    !dep_part.empty?
end

def version_prefix_re
  @version_prefix_re ||= Regexp.new('^v')
end

def version_re
  @version_re ||= Regexp.new('\d+\.\d+\.\d+')
end

def word?(dep_part)
  dep = dep_part.chomp(':')
  dep =~ word_re
end

def word_dot_re
  @word_dot_re ||= Regexp.new('^[.\w]+$')
end

def word_re
  @word_re ||= Regexp.new('^\w+$')
end