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// The MIT License
//
// Copyright (c) 2013 Tim Perry
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

// Description of import into Moodle:
// Download from https://github.com/pimterry/loglevel/dist
// Copy loglevel.js into lib/amd/src/ in Moodle folder.
// Add the license as a comment to the file and these instructions.

/*
 * loglevel - https://github.com/pimterry/loglevel
 *
 * Copyright (c) 2013 Tim Perry
 * Licensed under the MIT license.
 */
/*! loglevel - v1.5.1 - https://github.com/pimterry/loglevel - (c) 2017 Tim Perry - licensed MIT */
(function (root, definition) {
    "use strict";
    if (typeof define === 'function' && define.amd) {
        define(definition);
    } else if (typeof module === 'object' && module.exports) {
        module.exports = definition();
    } else {
        root.log = definition();
    }
}(this, function () {
    "use strict";

// Slightly dubious tricks to cut down minimized file size
    var noop = function() {};
    var undefinedType = "undefined";

var logMethods = [
        "trace",
        "debug",
        "info",
        "warn",
        "error"
    ];

// Cross-browser bind equivalent that works at least back to IE6
    function bindMethod(obj, methodName) {
        var method = obj[methodName];
        if (typeof method.bind === 'function') {
            return method.bind(obj);
        } else {
            try {
                return Function.prototype.bind.call(method, obj);
            } catch (e) {
                // Missing bind shim or IE8 + Modernizr, fallback to wrapping
                return function() {
                    return Function.prototype.apply.apply(method, [obj, arguments]);
                };
            }
        }
    }

// Build the best logging method possible for this env
    // Wherever possible we want to bind, not wrap, to preserve stack traces
    function realMethod(methodName) {
        if (methodName === 'debug') {
            methodName = 'log';
        }

if (typeof console === undefinedType) {
            return false; // No method possible, for now - fixed later by enableLoggingWhenConsoleArrives
        } else if (console[methodName] !== undefined) {
            return bindMethod(console, methodName);
        } else if (console.log !== undefined) {
            return bindMethod(console, 'log');
        } else {
            return noop;
        }
    }

// These private functions always need `this` to be set properly

function replaceLoggingMethods(level, loggerName) {
        /*jshint validthis:true */
        for (var i = 0; i < logMethods.length; i++) {
            var methodName = logMethods[i];
            this[methodName] = (i < level) ?
                noop :
                this.methodFactory(methodName, level, loggerName);
        }

// Define log.log as an alias for log.debug
        this.log = this.debug;
    }

// In old IE versions, the console isn't present until you first open it.
    // We build realMethod() replacements here that regenerate logging methods
    function enableLoggingWhenConsoleArrives(methodName, level, loggerName) {
        return function () {
            if (typeof console !== undefinedType) {
                replaceLoggingMethods.call(this, level, loggerName);
                this[methodName].apply(this, arguments);
            }
        };
    }

// By default, we use closely bound real methods wherever possible, and
    // otherwise we wait for a console to appear, and then try again.
    function defaultMethodFactory(methodName, level, loggerName) {
        /*jshint validthis:true */
        return realMethod(methodName) ||
               enableLoggingWhenConsoleArrives.apply(this, arguments);
    }

function Logger(name, defaultLevel, factory) {
      var self = this;
      var currentLevel;
      var storageKey = "loglevel";
      if (name) {
        storageKey += ":" + name;
      }

function persistLevelIfPossible(levelNum) {
          var levelName = (logMethods[levelNum] || 'silent').toUpperCase();

if (typeof window === undefinedType) return;

// Use localStorage if available
          try {
              window.localStorage[storageKey] = levelName;
              return;
          } catch (ignore) {}

// Use session cookie as fallback
          try {
              window.document.cookie =
                encodeURIComponent(storageKey) + "=" + levelName + ";";
          } catch (ignore) {}
      }

function getPersistedLevel() {
          var storedLevel;

if (typeof window === undefinedType) return;

try {
              storedLevel = window.localStorage[storageKey];
          } catch (ignore) {}

// Fallback to cookies if local storage gives us nothing
          if (typeof storedLevel === undefinedType) {
              try {
                  var cookie = window.document.cookie;
                  var location = cookie.indexOf(
                      encodeURIComponent(storageKey) + "=");
                  if (location !== -1) {
                      storedLevel = /^([^;]+)/.exec(cookie.slice(location))[1];
                  }
              } catch (ignore) {}
          }

// If the stored level is not valid, treat it as if nothing was stored.
          if (self.levels[storedLevel] === undefined) {
              storedLevel = undefined;
          }

return storedLevel;
      }

/*
       *
       * Public logger API - see https://github.com/pimterry/loglevel for details
       *
       */

self.levels = { "TRACE": 0, "DEBUG": 1, "INFO": 2, "WARN": 3,
          "ERROR": 4, "SILENT": 5};

self.methodFactory = factory || defaultMethodFactory;

self.getLevel = function () {
          return currentLevel;
      };

self.setLevel = function (level, persist) {
          if (typeof level === "string" && self.levels[level.toUpperCase()] !== undefined) {
              level = self.levels[level.toUpperCase()];
          }
          if (typeof level === "number" && level >= 0 && level <= self.levels.SILENT) {
              currentLevel = level;
              if (persist !== false) {  // defaults to true
                  persistLevelIfPossible(level);
              }
              replaceLoggingMethods.call(self, level, name);
              if (typeof console === undefinedType && level < self.levels.SILENT) {
                  return "No console available for logging";
              }
          } else {
              throw "log.setLevel() called with invalid level: " + level;
          }
      };

self.setDefaultLevel = function (level) {
          if (!getPersistedLevel()) {
              self.setLevel(level, false);
          }
      };

self.enableAll = function(persist) {
          self.setLevel(self.levels.TRACE, persist);
      };

self.disableAll = function(persist) {
          self.setLevel(self.levels.SILENT, persist);
      };

// Initialize with the right level
      var initialLevel = getPersistedLevel();
      if (initialLevel == null) {
          initialLevel = defaultLevel == null ? "WARN" : defaultLevel;
      }
      self.setLevel(initialLevel, false);
    }

/*
     *
     * Top-level API
     *
     */

var defaultLogger = new Logger();

var _loggersByName = {};
    defaultLogger.getLogger = function getLogger(name) {
        if (typeof name !== "string" || name === "") {
          throw new TypeError("You must supply a name when creating a logger.");
        }

var logger = _loggersByName[name];
        if (!logger) {
          logger = _loggersByName[name] = new Logger(
            name, defaultLogger.getLevel(), defaultLogger.methodFactory);
        }
        return logger;
    };

// Grab the current global log variable in case of overwrite
    var _log = (typeof window !== undefinedType) ? window.log : undefined;
    defaultLogger.noConflict = function() {
        if (typeof window !== undefinedType &&
               window.log === defaultLogger) {
            window.log = _log;
        }

return defaultLogger;
    };

return defaultLogger;
}));