require_relative '../helper'
require 'fluent/configurable'
require 'fluent/config/element'
require 'fluent/config/section'
require 'fluent/system_config'

module Fluent::Config
  class FakeLoggerInitializer
    attr_accessor :level
    def initialize
      @level = nil
    end
  end

  class FakeSupervisor
    attr_writer :log_level

    def initialize(**opt)
      @system_config = nil
      @cl_opt = {
        wokers: nil,
        root_dir: nil,
        log: FakeLoggerInitializer.new,
        log_level: Fluent::Log::LEVEL_INFO,
        suppress_interval: nil,
        suppress_config_dump: nil,
        suppress_repeated_stacktrace: nil,
        log_event_label: nil,
        log_event_verbose: nil,
        without_source: nil,
        emit_error_log_interval: nil,
        file_permission: nil,
        dir_permission: nil,
      }.merge(opt)
    end

    def for_system_config
      opt = {}
      # this is copy from Supervisor#build_system_config
      Fluent::SystemConfig::SYSTEM_CONFIG_PARAMETERS.each do |param|
        if @cl_opt.key?(param) && !@cl_opt[param].nil?
          if param == :log_level && @cl_opt[:log_level] == Fluent::Log::LEVEL_INFO
            # info level can't be specified via command line option.
            # log_level is info here, it is default value and <system>'s log_level should be applied if exists.
            next
          end

          opt[param] = @cl_opt[param]
        end
      end

      opt
    end
  end

  class TestSystemConfig < ::Test::Unit::TestCase
    TMP_DIR = File.expand_path(File.dirname(__FILE__) + "/tmp/system_config/#{ENV['TEST_ENV_NUMBER']}")

    def parse_text(text)
      basepath = File.expand_path(File.dirname(__FILE__) + '/../../')
      Fluent::Config.parse(text, '(test)', basepath, true).elements.find { |e| e.name == 'system' }
    end

    test 'should not override default configurations when no parameters' do
      conf = parse_text(<<-EOS)
        <system>
        </system>
      EOS
      s = FakeSupervisor.new
      sc = Fluent::SystemConfig.new(conf)
      sc.overwrite_variables(s.for_system_config)
      assert_equal(1, sc.workers)
      assert_nil(sc.root_dir)
      assert_nil(sc.log_level)
      assert_nil(sc.suppress_repeated_stacktrace)
      assert_nil(sc.emit_error_log_interval)
      assert_nil(sc.suppress_config_dump)
      assert_nil(sc.without_source)
      assert_equal(:text, sc.log.format)
      assert_equal('%Y-%m-%d %H:%M:%S %z', sc.log.time_format)
    end

    data(
      'workers' => ['workers', 3],
      'root_dir' => ['root_dir', File.join(TMP_DIR, 'root')],
      'log_level' => ['log_level', 'error'],
      'suppress_repeated_stacktrace' => ['suppress_repeated_stacktrace', true],
      'log_event_verbose' => ['log_event_verbose', true],
      'suppress_config_dump' => ['suppress_config_dump', true],
      'without_source' => ['without_source', true],
    )
    test "accepts parameters" do |(k, v)|
      conf = parse_text(<<-EOS)
          <system>
            #{k} #{v}
          </system>
      EOS
      s = FakeSupervisor.new
      sc = Fluent::SystemConfig.new(conf)
      sc.overwrite_variables(s.for_system_config)
      if k == 'log_level'
        assert_equal(Fluent::Log::LEVEL_ERROR, sc.__send__(k))
      else
        assert_equal(v, sc.__send__(k))
      end
    end

    test "log parameters" do
      conf = parse_text(<<-EOS)
          <system>
            <log>
              format json
              time_format %Y
            </log>
          </system>
      EOS
      s = FakeSupervisor.new
      sc = Fluent::SystemConfig.new(conf)
      sc.overwrite_variables(s.for_system_config)
      assert_equal(:json, sc.log.format)
      assert_equal('%Y', sc.log.time_format)
    end

    # info is removed because info level can't be specified via command line
    data('trace' => Fluent::Log::LEVEL_TRACE,
         'debug' => Fluent::Log::LEVEL_DEBUG,
         'warn' => Fluent::Log::LEVEL_WARN,
         'error' => Fluent::Log::LEVEL_ERROR,
         'fatal' => Fluent::Log::LEVEL_FATAL)
    test 'log_level is ignored when log_level related command line option is passed' do |level|
      conf = parse_text(<<-EOS)
        <system>
          log_level info
        </system>
      EOS
      s = FakeSupervisor.new(log_level: level)
      sc = Fluent::SystemConfig.new(conf)
      sc.overwrite_variables(s.for_system_config)
      assert_equal(level, sc.log_level)
    end
  end
end