# -*- coding: utf-8 -*-
require 'tengine/support/config'
require 'active_support/hash_with_indifferent_access'

class Tengine::Support::Config::Logger
  include Tengine::Support::Config::Definition

  field :output, 'file path or "STDOUT" / "STDERR" / "NULL".', :type => :string, :default => "STDOUT" do |value|
    value = value.to_s
    case value
    when *%w[STDOUT STDERR NULL] then value
    else
      dirname = File.dirname(File.expand_path(value))
      raise ArgumentError, "directory not found #{dirname} for value" unless File.directory?(dirname)
      value
    end
  end

  field :rotation, 'rotation file count or daily,weekly,monthly.' do |value|
    if value.nil?
      nil
    elsif value.is_a?(Integer)
      value
    else
      case value.to_s
      when *%w[daily weekly monthly] then value
      when /\A\d+\Z/ then value.to_i
      else raise ArgumentError, "must be nil or an Integer or one of daily,weekly,monthly"
      end
    end
  end

  field :rotation_size, 'number of max log file size.', :type => :integer

  field :level, 'Logging severity threshold.', :type => :string,
    :enum => %w[debug info warn error fatal], :default => "info"

  field :progname, 'program name to include in log messages.', :type => :string

  field :datetime_format, 'A string suitable for passing to strftime.', :type => :string

  # formatterにはprocしか設定できないので特別設定ファイルやコマンドラインオプションで指定することはできません。
  # もしformatteを指す名前を指定したい場合は、別途定義したfieldをから求めたformatterの値を、
  # オーバーライドしたnew_loggerで設定するようにしてください。
  attr_accessor :formatter
  # field :formatter, 'Logging formatter, as a Proc that will take four arguments and return the formatted message.',
  #   :type => :proc, :hidden => true

  def new_logger(options = {})
    options = ActiveSupport::HashWithIndifferentAccess.new(to_hash).update(options || {})
    case output = options[:output]
    when "NULL" then return Tengine::Support::NullLogger.new
    when "STDOUT" then dev = STDOUT
    when "STDERR" then dev = STDERR
    else dev = output
    end
    rotation = options[:rotation]
    shift_age = (rotation =~ /\A\d+\Z/) ? rotation.to_i : rotation
    dtf = options[:datetime_format]
    result = ::Logger.new(dev, shift_age, options[:rotation_size])
    result.formatter = (options[:formatter] || dtf) ? Logger::Formatter.new : nil
    result.datetime_format = dtf if dtf
    result.level = ::Logger.const_get(options[:level].to_s.upcase)
    progname = options[:progname]
    result.progname = progname if progname
    result
  end

end