// This is the **logger** module for *Karma*. It uses
// [log4js](https://github.com/nomiddlename/log4js-node) to handle and
// configure all logging that happens inside of *Karma*.


// ### Helpers and Setup

var log4js = require('log4js');
var helper = require('./helper');
var constant = require('./constants');

// Special Wrapper for Socket.io :(
var LogWrapper = function(name, level) {
  this.logger = log4js.getLogger(name);
  this.logger.setLevel(level);
};
['error', 'warn', 'info', 'debug'].forEach(function(level) {
  LogWrapper.prototype[level] = function() {
    this.logger[level].apply(this.logger, arguments);
  };
});

// #### Public Functions

// Setup the logger by passing in the configuration options. It needs
// three argumentes:
//
//     setup(logLevel, colors, appenders)
//
// * `logLevel`: *String* Defines the global log level.
// * `colors`: *Boolean* Use colors in the stdout or not.
// * `appenders`: *Array* This will be passed as appenders to log4js
//   to allow for fine grained configuration of log4js. For more information
//   see https://github.com/nomiddlename/log4js-node.
var setup = function(level, colors, appenders) {
  // Turn color on/off on the console appenders with pattern layout
  var pattern = colors ? constant.COLOR_PATTERN : constant.NO_COLOR_PATTERN;

  // If there are no appenders use the default one
  appenders = helper.isDefined(appenders) ? appenders : [constant.CONSOLE_APPENDER];

  appenders = appenders.map(function(appender) {
    if (appender.type === 'console') {
      if (helper.isDefined(appender.layout) && appender.layout.type === 'pattern') {
        appender.layout.pattern = pattern;
      }
    }
    return appender;
  });

  // Pass the values to log4js
  log4js.setGlobalLogLevel(level);
  log4js.configure({
    appenders: appenders
  });
};

// Create a new logger. There are two optional arguments
// * `name`, which defaults to `karma` and
//   If the `name = 'socket.io'` this will create a special wrapper
//   to be used as a logger for socket.io.
// * `level`, which defaults to the global level.
var create = function(name, level) {
  if (name === 'socket.io') {
    return new LogWrapper('socket.io', level);
  } else {
    var logger = log4js.getLogger(name || 'karma');
    if (helper.isDefined(level)) {
      logger.setLevel(level);
    }
    return logger;
  }
};


// #### Publish

exports.create = create;
exports.setup = setup;
