module Eco
  module API
    module Common
      module Session
        class Logger
          DEFAULT_TIMESTAMP_PATTERN = '%Y-%m-%dT%H:%M:%S'

          def initialize(console_level: nil, file_level: ::Logger::DEBUG, log_file: nil, timestamp_console: false, enviro: nil)
            raise "Required Environment object (enviro:). Given: #{enviro}" if enviro && !enviro.is_a?(Eco::API::Common::Session::Environment)
            @enviro = enviro

            timestamp_console = fetch_timestamp_console(timestamp_console)
            @console_logger = ::Logger.new(STDOUT).tap do |_logger|
              _logger.formatter = proc do |severity, datetime, progname, msg|
                str_timestamp = timestamp_console ? "#{datetime.strftime(DEFAULT_TIMESTAMP_PATTERN)} >" : ""
                "#{severity.to_s[0]}: #{str_timestamp} #{msg}\n"
              end
              _logger.level = fetch_console_level(console_level)
            end

            if log_file = fetch_log_file(log_file)
              @file_logger = ::Logger.new(log_file).tap do |_logger|
                _logger.formatter = proc do |severity, datetime, progname, msg|
                  "#{severity.to_s[0]}: #{datetime.strftime(DEFAULT_TIMESTAMP_PATTERN)} > #{msg}\n"
                end
                _logger.level = fetch_file_level(file_level)
              end
            end
          end

          def debug(*args, &block)
            log(:debug, *args, &block)
          end

          def info(*args, &block)
            log(:info, *args, &block)
          end

          def warn(*args, &block)
            return log(:warn, *args, &block)
          end

          def error(*args, &block)
            return log(:error, *args, &block)
          end

          def fatal(*args, &block)
            return log(:fatal, *args, &block)
          end

          def unkown(msg, &block)
            return log(:unkown, *args, &block)
          end

          def << (msg)
            @console_logger << msg unless !@console_logger
            @file_logger << msg    unless !@file_logger
          end

          def close()
            @console_logger.close unless !@console_logger
            @file_logger.close    unless !@file_logger
          end

          def add(*args)
            @console_logger.add(*args) unless !@console_logger
            @file_logger.add(*args)    unless !@file_logger
          end

          private

          def log(level, *args, &block)
            @console_logger.send(level, *args, &block) unless !@console_logger
            @file_logger.send(level, *args, &block) unless !@file_logger
          end

          def config
            @enviro.config || {}
          end

          def fetch_timestamp_console(value)
            value || config.logger.timestamp_console
          end

          def fetch_console_level(value)
            value || config.logger.console_level || ::Logger::INFO
          end

          def fetch_file_level(value)
            value || config.logger.file_level || ::Logger::DEBUG
          end

          def fetch_log_file(log_file)
            if log_file ||= config.logger.file
              log_file = @enviro.file_manager.dir.file(log_file) if @enviro
              FileManager.create_directory(log_file, includes_file: true)
            end
            log_file
          end

        end
      end
    end
  end
end