java()
local Logger = require "java:org.apache.log4j.Logger"
local EnhancedPatternLayout = require "java:org.apache.log4j.EnhancedPatternLayout"
local ConsoleAppender = require "java:org.apache.log4j.ConsoleAppender"
local Level = require "java:org.apache.log4j.Level"
local RollingFileAppender = require "java:org.apache.log4j.RollingFileAppender"
local LuanLogger = require "java:luan.modules.logging.LuanLogger"

local M = {}

M.layout = "%d %-5p %c - %m%n"

M.level = "INFO"

M.console = "System.err"  -- or "System.out" or set to nil for no console

M.file = nil  -- set to file name if you want logging to a file

M.max_file_size = nil  -- by default is "10MB"


M.log4j_root_logger = Logger.getRootLogger()

local function to_level(level)
	return level and Level.toLevel(level)
end

function M.log_to_file(file,logger_name)  -- logger_name is optional, defaults to root logger
	local appender = RollingFileAppender.new(M.ptn_layout, file)
	appender.setMaxFileSize(M.max_file_size)
	local logger = logger_name and Logger.getLogger(logger_name) or M.log4j_root_logger
	logger.addAppender(appender)
	return appender
end

function M.init()
	M.log4j_root_logger.removeAllAppenders()
	M.log4j_root_logger.setLevel( to_level(M.level) )
	M.ptn_layout = EnhancedPatternLayout.new(M.layout)

	if M.console ~= nil then
		M.console_appender = ConsoleAppender.new(M.ptn_layout,M.console)
		M.log4j_root_logger.addAppender(M.console_appender)
	else
		M.console_appender = nil
	end

	if M.file ~= nil then
		M.file_appender = M.log_to_file(M.file)
	else
		M.file_appender = nil
	end
end

M.init()


local function to_luan_logger(log4j_logger)
	local tbl = {}

	local luanLogger = LuanLogger.new(log4j_logger)
	tbl.error = luanLogger.error
	tbl.warn = luanLogger.warn
	tbl.info = luanLogger.info
	tbl.debug = luanLogger.debug

	function tbl.get_level()
		local level = log4j_logger.getLevel()
		return level and level.toString()
	end

	function tbl.get_effective_level()
		local level = log4j_logger.getEffectiveLevel()
		return level and level.toString()
	end

	function tbl.set_level(level)
		log4j_logger.setLevel( to_level(level) )
	end

	return tbl
end

function M.logger(name)
	return to_luan_logger( Logger.getLogger(name) )
end

function M.root_logger()
	return to_luan_logger( Logger.getRootLogger() )
end

return M