require 'test/unit'
require 'logger'

class TestLoggerSeverity < Test::Unit::TestCase
  def test_enum
    logger_levels = Logger.constants
    levels = ["WARN", "UNKNOWN", "INFO", "FATAL", "DEBUG", "ERROR"]
    Logger::Severity.constants.each do |level|
      assert(levels.include?(level))
      assert(logger_levels.include?(level))
    end
    assert_equal(levels.size, Logger::Severity.constants.size)
  end
end


class TestLogger < Test::Unit::TestCase
  include Logger::Severity

  def setup
    @logger = Logger.new(nil)
  end

  class Log
    attr_reader :label, :datetime, :pid, :severity, :progname, :msg
    def initialize(line)
      /\A(\w+), \[([^#]*)#(\d+)\]\s+(\w+) -- (\w*): ([\x0-\xff]*)/ =~ line
      @label, @datetime, @pid, @severity, @progname, @msg = $1, $2, $3, $4, $5, $6
    end
  end

  def log_add(logger, severity, msg, progname = nil, &block)
    log(logger, :add, severity, msg, progname, &block)
  end

  def log(logger, msg_id, *arg, &block)
    r, w = IO.pipe
    logger.instance_eval { @logdev = Logger::LogDevice.new(w) }
    logger.__send__(msg_id, *arg, &block)
    read_ready, = IO.select([r], nil, nil, 0.1)
    w.close
    if read_ready
      line = r.read
      r.close
      Log.new(line)
    else
      r.close
      nil
    end
  end

  def test_level
    @logger.level = UNKNOWN
    assert_equal(UNKNOWN, @logger.level)
    @logger.level = INFO
    assert_equal(INFO, @logger.level)
    @logger.sev_threshold = ERROR
    assert_equal(ERROR, @logger.sev_threshold)
    @logger.sev_threshold = WARN
    assert_equal(WARN, @logger.sev_threshold)
    assert_equal(WARN, @logger.level)

    @logger.level = DEBUG
    assert(@logger.debug?)
    assert(@logger.info?)
    @logger.level = INFO
    assert(!@logger.debug?)
    assert(@logger.info?)
    assert(@logger.warn?)
    @logger.level = WARN
    assert(!@logger.info?)
    assert(@logger.warn?)
    assert(@logger.error?)
    @logger.level = ERROR
    assert(!@logger.warn?)
    assert(@logger.error?)
    assert(@logger.fatal?)
    @logger.level = FATAL
    assert(!@logger.error?)
    assert(@logger.fatal?)
    @logger.level = UNKNOWN
    assert(!@logger.error?)
    assert(!@logger.fatal?)
  end

  def test_progname
    assert_nil(@logger.progname)
    @logger.progname = "name"
    assert_equal("name", @logger.progname)
  end

  def test_datetime_format
    dummy = STDERR
    logger = Logger.new(dummy)
    log = log_add(logger, INFO, "foo")
    assert_match(/^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d.\s*\d+ $/, log.datetime)
    logger.datetime_format = "%d%b%Y@%H:%M:%S"
    log = log_add(logger, INFO, "foo")
    assert_match(/^\d\d\w\w\w\d\d\d\d@\d\d:\d\d:\d\d$/, log.datetime)
    logger.datetime_format = ""
    log = log_add(logger, INFO, "foo")
    assert_match(/^$/, log.datetime)
  end

  def test_initialize
    logger = Logger.new(STDERR)
    assert_nil(logger.progname)
    assert_equal(DEBUG, logger.level)
    assert_nil(logger.datetime_format)
  end

  def test_add
    logger = Logger.new(nil)
    logger.progname = "my_progname"
    assert(logger.add(INFO))
    log = log_add(logger, nil, "msg")
    assert_equal("ANY", log.severity)
    assert_equal("my_progname", log.progname)
    logger.level = WARN
    assert(logger.log(INFO))
    assert_nil(log_add(logger, INFO, "msg"))
    log = log_add(logger, WARN, nil) { "msg" }
    assert_equal("msg\n", log.msg)
    log = log_add(logger, WARN, "") { "msg" }
    assert_equal("\n", log.msg)
    assert_equal("my_progname", log.progname)
    log = log_add(logger, WARN, nil, "progname?")
    assert_equal("progname?\n", log.msg)
    assert_equal("my_progname", log.progname)
  end

  def test_level_log
    logger = Logger.new(nil)
    logger.progname = "my_progname"
    log = log(logger, :debug, "custom_progname") { "msg" }
    assert_equal("msg\n", log.msg)
    assert_equal("custom_progname", log.progname)
    assert_equal("DEBUG", log.severity)
    assert_equal("D", log.label)
    #
    log = log(logger, :debug) { "msg_block" }
    assert_equal("msg_block\n", log.msg)
    assert_equal("my_progname", log.progname)
    log = log(logger, :debug, "msg_inline")
    assert_equal("msg_inline\n", log.msg)
    assert_equal("my_progname", log.progname)
    #
    log = log(logger, :info, "custom_progname") { "msg" }
    assert_equal("msg\n", log.msg)
    assert_equal("custom_progname", log.progname)
    assert_equal("INFO", log.severity)
    assert_equal("I", log.label)
    #
    log = log(logger, :warn, "custom_progname") { "msg" }
    assert_equal("msg\n", log.msg)
    assert_equal("custom_progname", log.progname)
    assert_equal("WARN", log.severity)
    assert_equal("W", log.label)
    #
    log = log(logger, :error, "custom_progname") { "msg" }
    assert_equal("msg\n", log.msg)
    assert_equal("custom_progname", log.progname)
    assert_equal("ERROR", log.severity)
    assert_equal("E", log.label)
    #
    log = log(logger, :fatal, "custom_progname") { "msg" }
    assert_equal("msg\n", log.msg)
    assert_equal("custom_progname", log.progname)
    assert_equal("FATAL", log.severity)
    assert_equal("F", log.label)
    #
    log = log(logger, :unknown, "custom_progname") { "msg" }
    assert_equal("msg\n", log.msg)
    assert_equal("custom_progname", log.progname)
    assert_equal("ANY", log.severity)
    assert_equal("A", log.label)
  end

  def test_close
    r, w = IO.pipe
    assert(!w.closed?)
    logger = Logger.new(w)
    logger.close
    assert(w.closed?)
    r.close
  end

  class MyError < StandardError
  end

  class MyMsg
    def inspect
      "my_msg"
    end
  end

  def test_format
    logger = Logger.new(nil)
    log = log_add(logger, INFO, "msg\n")
    assert_equal("msg\n\n", log.msg)
    begin
      raise MyError.new("excn")
    rescue MyError => e
      log = log_add(logger, INFO, e)
      assert_match(/^excn \(TestLogger::MyError\)/, log.msg)
      # expects backtrace is dumped across multi lines.  10 might be changed.
      assert(log.msg.split(/\n/).size >= 10)
    end
    log = log_add(logger, INFO, MyMsg.new)
    assert_equal("my_msg\n", log.msg)
  end

  def test_lshift
    r, w = IO.pipe
    logger = Logger.new(w)
    logger << "msg"
    read_ready, = IO.select([r], nil, nil, 0.1)
    w.close
    msg = r.read
    r.close
    assert_equal("msg", msg)
    #
    r, w = IO.pipe
    logger = Logger.new(w)
    logger << "msg2\n\n"
    read_ready, = IO.select([r], nil, nil, 0.1)
    w.close
    msg = r.read
    r.close
    assert_equal("msg2\n\n", msg)
  end
end