module Bundler::GemHelpers

def generic(p)
  return p if p == Gem::Platform::RUBY
  GENERIC_CACHE[p] ||= begin
    _, found = GENERICS.find do |match, _generic|
      p.os == match.os && (!match.cpu || p.cpu == match.cpu)
    end
    found || Gem::Platform::RUBY
  end
end

def generic_local_platform
  generic(Bundler.local_platform)
end

def platform_specificity_match(spec_platform, user_platform)
  spec_platform = Gem::Platform.new(spec_platform)
  return PlatformMatch::EXACT_MATCH if spec_platform == user_platform
  return PlatformMatch::WORST_MATCH if spec_platform.nil? || spec_platform == Gem::Platform::RUBY || user_platform == Gem::Platform::RUBY
  PlatformMatch.new(
    PlatformMatch.os_match(spec_platform, user_platform),
    PlatformMatch.cpu_match(spec_platform, user_platform),
    PlatformMatch.platform_version_match(spec_platform, user_platform)
  )
end

def select_best_platform_match(specs, platform)
  specs.select {|spec| spec.match_platform(platform) }.
    min_by {|spec| platform_specificity_match(spec.platform, platform) }
end