# Licensed to the Software Freedom Conservancy (SFC) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The SFC licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

require 'rbconfig'
require 'socket'

module Selenium
  module WebDriver
    # @api private
    module Platform
      module_function

      def home
        # jruby has an issue with ENV['HOME'] on Windows
        @home ||= jruby? ? ENV_JAVA['user.home'] : ENV['HOME']
      end

      def engine
        @engine ||= defined?(RUBY_ENGINE) ? RUBY_ENGINE.to_sym : :ruby
      end

      def os
        host_os = RbConfig::CONFIG['host_os']
        @os ||= case host_os
                when /mswin|msys|mingw|cygwin|bccwin|wince|emc/
                  :windows
                when /darwin|mac os/
                  :macosx
                when /linux/
                  :linux
                when /solaris|bsd/
                  :unix
                else
                  raise Error::WebDriverError, "unknown os: #{host_os.inspect}"
                end
      end

      def ci
        return :travis if ENV['TRAVIS']
        :jenkins if ENV['JENKINS']
      end

      def bitsize
        @bitsize ||= if defined?(FFI::Platform::ADDRESS_SIZE)
                       FFI::Platform::ADDRESS_SIZE
                     elsif defined?(FFI)
                       FFI.type_size(:pointer) == 4 ? 32 : 64
                     elsif jruby?
                       Integer(ENV_JAVA['sun.arch.data.model'])
                     else
                       1.size == 4 ? 32 : 64
                     end
      end

      def jruby?
        engine == :jruby
      end

      def ironruby?
        engine == :ironruby
      end

      def ruby_version
        RUBY_VERSION
      end

      def windows?
        os == :windows
      end

      def mac?
        os == :macosx
      end

      def linux?
        os == :linux
      end

      def cygwin?
        RUBY_PLATFORM =~ /cygwin/
        !Regexp.last_match.nil?
      end

      def null_device
        @null_device ||= if defined?(File::NULL)
                           File::NULL
                         else
                           Platform.windows? ? 'NUL' : '/dev/null'
                         end
      end

      def wrap_in_quotes_if_necessary(str)
        windows? && !cygwin? ? %("#{str}") : str
      end

      def cygwin_path(path, opts = {})
        flags = []
        opts.each { |k, v| flags << "--#{k}" if v }

        `cygpath #{flags.join ' '} "#{path}"`.strip
      end

      def make_writable(file)
        File.chmod 0o766, file
      end

      def assert_file(path)
        return if File.file? path
        raise Error::WebDriverError, "not a file: #{path.inspect}"
      end

      def assert_executable(path)
        assert_file(path)

        return if File.executable? path
        raise Error::WebDriverError, "not executable: #{path.inspect}"
      end

      def exit_hook
        pid = Process.pid

        at_exit { yield if Process.pid == pid }
      end

      def find_binary(*binary_names)
        paths = ENV['PATH'].split(File::PATH_SEPARATOR)

        if windows?
          binary_names.map! { |n| "#{n}.exe" }
          binary_names.dup.each { |n| binary_names << n.gsub('exe', 'bat') }
        end

        binary_names.each do |binary_name|
          paths.each do |path|
            full_path = File.join(path, binary_name)
            full_path.tr!('\\', '/') if windows?
            exe = Dir.glob(full_path).find { |f| File.executable?(f) }
            return exe if exe
          end
        end

        nil
      end

      def find_in_program_files(*binary_names)
        paths = [
          ENV['PROGRAMFILES'] || '\\Program Files',
          ENV['ProgramFiles(x86)'] || '\\Program Files (x86)',
          ENV['ProgramW6432'] || '\\Program Files'
        ]

        paths.each do |root|
          binary_names.each do |name|
            exe = File.join(root, name)
            return exe if File.executable?(exe)
          end
        end

        nil
      end

      def localhost
        info = Socket.getaddrinfo 'localhost', 80, Socket::AF_INET, Socket::SOCK_STREAM

        return info[0][3] unless info.empty?
        raise Error::WebDriverError, "unable to translate 'localhost' for TCP + IPv4"
      end

      def ip
        orig = Socket.do_not_reverse_lookup
        Socket.do_not_reverse_lookup = true

        begin
          UDPSocket.open do |s|
            s.connect '8.8.8.8', 53
            return s.addr.last
          end
        ensure
          Socket.do_not_reverse_lookup = orig
        end
      rescue Errno::ENETUNREACH, Errno::EHOSTUNREACH
        # no external ip
      end

      def interfaces
        interfaces = Socket.getaddrinfo('localhost', 8080).map { |e| e[3] }
        interfaces += ['0.0.0.0', Platform.ip]

        interfaces.compact.uniq
      end
    end # Platform
  end # WebDriver
end # Selenium

if $PROGRAM_NAME == __FILE__
  p engine: Selenium::WebDriver::Platform.engine,
    os: Selenium::WebDriver::Platform.os,
    ruby_version: Selenium::WebDriver::Platform.ruby_version,
    jruby?: Selenium::WebDriver::Platform.jruby?,
    windows?: Selenium::WebDriver::Platform.windows?,
    home: Selenium::WebDriver::Platform.home,
    bitsize: Selenium::WebDriver::Platform.bitsize,
    localhost: Selenium::WebDriver::Platform.localhost,
    ip: Selenium::WebDriver::Platform.ip,
    interfaces: Selenium::WebDriver::Platform.interfaces,
    null_device: Selenium::WebDriver::Platform.null_device
end