local enum Level
   "DEBUG"
   "INFO"
   "WARN"
   "ERROR"
   "FATAL"
   "OFF"
end

local type Append = function<T>(params: T, ...: any): Log

local record Log
   append: Append
   setLevel: function (self: Log, level: Level)
   log: function(self: Log, level: Level, ...: any)
   getPrint: function(self: Log, level: Level): function(...: any)

   debug: function(self: Log, ...: any)
   info: function(self: Log, ...: any)
   warn: function(self: Log, ...: any)
   error: function(self: Log, ...: any)
   fatal: function(self: Log, ...: any)

   DEBUG: Level
   INFO: Level
   WARN: Level
   ERROR: Level
   FATAL: Level
   OFF: Level
end


local record logging
   Level: Level
   Append: Append
   Log: Log

   enum ConsoleDestination
      "stdout"
      "stderr"
   end

   record ConsoleParameters
      destination: ConsoleDestination
      logPattern: string
      logPatterns: { Level: string }
      timestampPattern: string
      logLevel: Level
   end

   record FileParameters
      filename: string
      datePattern: string
      logPattern: string
      logPatterns: { Level: string }
      timestampPattern: string
      logLevel: Level
   end

   record RollingFileParameters
      filename: string
      maxFileSize: number
      maxBackupIndex: number
      logPattern: string
      logPatterns: { Level: string }
      timestampPattern: string
      logLevel: Level
   end

   _COPYRIGHT: string
   _DESCRIPTION: string
   _VERSION: string

   DEBUG: Level
   INFO: Level
   WARN: Level
   ERROR: Level
   FATAL: Level
   OFF: Level

   new: function(append: function(self: Log, level: Level, msg: string | function), startLevel: Level): Log
   buildLogPatterns: function(patterns: table, default: string): table
   defaultLogPatterns: function(patt: string | table): table
   defaultTimestampPattern: function(patt: string): string
   defaultLevel: function(level: Level): Level
   defaultLogger: function(logger: Log): Log

   -- Deprecated
   getDeprecatedParams: function(lst: table, ...: any)

   -- Appenders (dynamically added to logging when required)
   console: Append<ConsoleParameters>
   file: Append<FileParameters>
   rolling_file: Append<RollingFileParameters>
   -- TODO : add more appenders
end

return logging