class ChefConfig::WorkstationConfigLoader

def apply_config(config_content, config_file_path)
  Config.from_string(config_content, config_file_path)
rescue SignalException
  raise
rescue SyntaxError => e
  message = ""
  message << "You have invalid ruby syntax in your config file #{config_file_path}\n\n"
  message << "#{e.class.name}: #{e.message}\n"
  if file_line = e.message[/#{Regexp.escape(config_file_path)}:[\d]+/]
    line = file_line[/:([\d]+)$/, 1].to_i
    message << highlight_config_error(config_file_path, line)
  end
  raise ChefConfig::ConfigurationError, message
rescue Exception => e
  message = "You have an error in your config file #{config_file_path}\n\n"
  message << "#{e.class.name}: #{e.message}\n"
  filtered_trace = e.backtrace.grep(/#{Regexp.escape(config_file_path)}/)
  filtered_trace.each { |bt_line| message << "  " << bt_line << "\n" }
  if !filtered_trace.empty?
    line_nr = filtered_trace.first[/#{Regexp.escape(config_file_path)}:([\d]+)/, 1]
    message << highlight_config_error(config_file_path, line_nr.to_i)
  end
  raise ChefConfig::ConfigurationError, message
end

def chef_config_dir
  if @chef_config_dir.nil?
    @chef_config_dir = false
    full_path = working_directory.split(File::SEPARATOR)
    (full_path.length - 1).downto(0) do |i|
      candidate_directory = File.join(full_path[0..i] + [".chef"])
      if File.exist?(candidate_directory) && File.directory?(candidate_directory)
        @chef_config_dir = candidate_directory
        break
      end
    end
  end
  @chef_config_dir
end

def config_location
  @config_location ||= (explicit_config_file || locate_local_config)
end

def env
  ENV
end

def have_config?(path)
  if path_exists?(path)
    logger.info("Using config at #{path}")
    true
  else
    logger.debug("Config not found at #{path}, trying next option")
    false
  end
end

def highlight_config_error(file, line)
  config_file_lines = []
  IO.readlines(file).each_with_index { |l, i| config_file_lines << "#{(i + 1).to_s.rjust(3)}: #{l.chomp}" }
  if line == 1
    lines = config_file_lines[0..3]
  else
    lines = config_file_lines[Range.new(line - 2, line)]
  end
  "Relevant file content:\n" + lines.join("\n") + "\n"
end

def initialize(explicit_config_file, logger = nil)
  @explicit_config_file = explicit_config_file
  @chef_config_dir = nil
  @config_location = nil
  @logger = logger || NullLogger.new
end

def load
  # Ignore it if there's no explicit_config_file and can't find one at a
  # default path.
  if !config_location.nil?
    if explicit_config_file && !path_exists?(config_location)
      raise ChefConfig::ConfigurationError, "Specified config file #{config_location} does not exist"
    end
    # Have to set Config.config_file b/c other config is derived from it.
    Config.config_file = config_location
    apply_config(IO.read(config_location), config_location)
  end
  load_dot_d(Config[:config_d_dir]) if Config[:config_d_dir]
end

def locate_local_config
  candidate_configs = []
  # Look for $KNIFE_HOME/knife.rb (allow multiple knives config on same machine)
  if env["KNIFE_HOME"]
    candidate_configs << File.join(env["KNIFE_HOME"], "config.rb")
    candidate_configs << File.join(env["KNIFE_HOME"], "knife.rb")
  end
  # Look for $PWD/knife.rb
  if Dir.pwd
    candidate_configs << File.join(Dir.pwd, "config.rb")
    candidate_configs << File.join(Dir.pwd, "knife.rb")
  end
  # Look for $UPWARD/.chef/knife.rb
  if chef_config_dir
    candidate_configs << File.join(chef_config_dir, "config.rb")
    candidate_configs << File.join(chef_config_dir, "knife.rb")
  end
  # Look for $HOME/.chef/knife.rb
  PathHelper.home(".chef") do |dot_chef_dir|
    candidate_configs << File.join(dot_chef_dir, "config.rb")
    candidate_configs << File.join(dot_chef_dir, "knife.rb")
  end
  candidate_configs.find do |candidate_config|
    have_config?(candidate_config)
  end
end

def logger
  @logger
end

def no_config_found?
  config_location.nil?
end

def path_exists?(path)
  Pathname.new(path).expand_path.exist?
end

def working_directory
  a = if ChefConfig.windows?
        env["CD"]
      else
        env["PWD"]
      end || Dir.pwd
  a
end