class Bundler::Env

def self.append_formatted_table(title, pairs, out)
  return if pairs.empty?
  out << "\n" unless out.empty?
  out << "## #{title}\n\n```\n"
  ljust = pairs.map {|k, _v| k.to_s.length }.max
  pairs.each do |k, v|
    out << "#{k.to_s.ljust(ljust)}  #{v}\n"
  end
  out << "```\n"
end

def self.chruby_version
  return "not installed" unless Bundler.which("chruby-exec")
  `chruby-exec -- chruby --version`.
    sub(/.*^chruby: (#{Gem::Version::VERSION_PATTERN}).*/m, '\1')
end

def self.environment
  out = []
  out << ["Bundler", Bundler::VERSION]
  out << ["  Platforms", Gem.platforms.join(", ")]
  out << ["Ruby", ruby_version]
  out << ["  Full Path", Gem.ruby]
  out << ["  Config Dir", Pathname.new(Gem::ConfigFile::SYSTEM_WIDE_CONFIG_FILE).dirname]
  out << ["RubyGems", Gem::VERSION]
  out << ["  Gem Home", Gem.dir]
  out << ["  Gem Path", Gem.path.join(File::PATH_SEPARATOR)]
  out << ["  User Home", Gem.user_home]
  out << ["  User Path", Gem.user_dir]
  out << ["  Bin Dir", Gem.bindir]
  if defined?(OpenSSL::SSL)
    out << ["OpenSSL"]
    out << ["  Compiled", OpenSSL::OPENSSL_VERSION] if defined?(OpenSSL::OPENSSL_VERSION)
    out << ["  Loaded", OpenSSL::OPENSSL_LIBRARY_VERSION] if defined?(OpenSSL::OPENSSL_LIBRARY_VERSION)
    out << ["  Cert File", OpenSSL::X509::DEFAULT_CERT_FILE] if defined?(OpenSSL::X509::DEFAULT_CERT_FILE)
    out << ["  Cert Dir", OpenSSL::X509::DEFAULT_CERT_DIR] if defined?(OpenSSL::X509::DEFAULT_CERT_DIR)
  end
  out << ["Tools"]
  out << ["  Git", git_version]
  out << ["  RVM", ENV.fetch("rvm_version") { version_of("rvm") }]
  out << ["  rbenv", version_of("rbenv")]
  out << ["  chruby", chruby_version]
  %w[rubygems-bundler open_gem].each do |name|
    specs = Bundler.rubygems.find_name(name)
    out << ["  #{name}", "(#{specs.map(&:version).join(",")})"] unless specs.empty?
  end
  if (exe = caller.last.split(":").first) && exe =~ %r{(exe|bin)/bundler?\z}
    shebang = File.read(exe).lines.first
    shebang.sub!(/^#!\s*/, "")
    unless shebang.start_with?(Gem.ruby, "/usr/bin/env ruby")
      out << ["Gem.ruby", Gem.ruby]
      out << ["bundle #!", shebang]
    end
  end
  out
end

def self.git_version
  Bundler::Source::Git::GitProxy.new(nil, nil).full_version
rescue Bundler::Source::Git::GitNotInstalledError
  "not installed"
end

def self.read_file(filename)
  Bundler.read_file(filename.to_s).strip
rescue Errno::ENOENT
  "<No #{filename} found>"
rescue RuntimeError => e
  "#{e.class}: #{e.message}"
end

def self.report(options = {})
  print_gemfile = options.delete(:print_gemfile) { true }
  print_gemspecs = options.delete(:print_gemspecs) { true }
  out = String.new
  append_formatted_table("Environment", environment, out)
  append_formatted_table("Bundler Build Metadata", BuildMetadata.to_h, out)
  unless Bundler.settings.all.empty?
    out << "\n## Bundler settings\n\n```\n"
    Bundler.settings.all.each do |setting|
      out << setting << "\n"
      Bundler.settings.pretty_values_for(setting).each do |line|
        out << "  " << line << "\n"
      end
    end
    out << "```\n"
  end
  return out unless SharedHelpers.in_bundle?
  if print_gemfile
    gemfiles = [Bundler.default_gemfile]
    begin
      gemfiles = Bundler.definition.gemfiles
    rescue GemfileNotFound
      nil
    end
    out << "\n## Gemfile\n"
    gemfiles.each do |gemfile|
      out << "\n### #{Pathname.new(gemfile).relative_path_from(SharedHelpers.pwd)}\n\n"
      out << "```ruby\n" << read_file(gemfile).chomp << "\n```\n"
    end
    out << "\n### #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)}\n\n"
    out << "```\n" << read_file(Bundler.default_lockfile).chomp << "\n```\n"
  end
  if print_gemspecs
    dsl = Dsl.new.tap {|d| d.eval_gemfile(Bundler.default_gemfile) }
    out << "\n## Gemspecs\n" unless dsl.gemspecs.empty?
    dsl.gemspecs.each do |gs|
      out << "\n### #{File.basename(gs.loaded_from)}"
      out << "\n\n```ruby\n" << read_file(gs.loaded_from).chomp << "\n```\n"
    end
  end
  out
end

def self.ruby_version
  str = String.new(RUBY_VERSION)
  str << "p#{RUBY_PATCHLEVEL}" if defined? RUBY_PATCHLEVEL
  str << " (#{RUBY_RELEASE_DATE} revision #{RUBY_REVISION}) [#{Gem::Platform.local}]"
end

def self.version_of(script)
  return "not installed" unless Bundler.which(script)
  `#{script} --version`.chomp
end

def self.write(io)
  io.write report
end