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/* NProgress, (c) 2013, 2014 Rico Sta. Cruz - http://ricostacruz.com/nprogress

 * @license MIT */

;(function(root, factory) {

  if (typeof define === 'function' && define.amd) {

    define(factory);

  } else if (typeof exports === 'object') {

    module.exports = factory();

  } else {

    root.NProgress = factory();

  }

})(this, function() {

  var NProgress = {};

  NProgress.version = '0.2.0';

  var Settings = NProgress.settings = {

    minimum: 0.08,

    easing: 'linear',

    positionUsing: '',

    speed: 200,

    trickle: true,

    trickleSpeed: 200,

    showSpinner: true,

    barSelector: '[role="bar"]',

    spinnerSelector: '[role="spinner"]',

    parent: 'body',

    template: '<div class="bar" role="bar"><div class="peg"></div></div><div class="spinner" role="spinner"><div class="spinner-icon"></div></div>'

  };

  /**

   * Updates configuration.

   *

   *     NProgress.configure({

   *       minimum: 0.1

   *     });

   */

  NProgress.configure = function(options) {

    var key, value;

    for (key in options) {

      value = options[key];

      if (value !== undefined && options.hasOwnProperty(key)) Settings[key] = value;

    }

    return this;

  };

  /**

   * Last number.

   */

  NProgress.status = null;

  /**

   * Sets the progress bar status, where `n` is a number from `0.0` to `1.0`.

   *

   *     NProgress.set(0.4);

   *     NProgress.set(1.0);

   */

  NProgress.set = function(n) {

    var started = NProgress.isStarted();

    n = clamp(n, Settings.minimum, 1);

    NProgress.status = (n === 1 ? null : n);

    var progress = NProgress.render(!started),

        bar      = progress.querySelector(Settings.barSelector),

        speed    = Settings.speed,

        ease     = Settings.easing;

    progress.offsetWidth; /* Repaint */

    queue(function(next) {

      // Set positionUsing if it hasn't already been set

      if (Settings.positionUsing === '') Settings.positionUsing = NProgress.getPositioningCSS();

      // Add transition

      css(bar, barPositionCSS(n, speed, ease));

      if (n === 1) {

        // Fade out

        css(progress, {

          transition: 'none',

          opacity: 1

        });

        progress.offsetWidth; /* Repaint */

        setTimeout(function() {

          css(progress, {

            transition: 'all ' + speed + 'ms linear',

            opacity: 0

          });

          setTimeout(function() {

            NProgress.remove();

            next();

          }, speed);

        }, speed);

      } else {

        setTimeout(next, speed);

      }

    });

    return this;

  };

  NProgress.isStarted = function() {

    return typeof NProgress.status === 'number';

  };

  /**

   * Shows the progress bar.

   * This is the same as setting the status to 0%, except that it doesn't go backwards.

   *

   *     NProgress.start();;

   *

   */

  NProgress.start = function() {

    if (!NProgress.status) NProgress.set(0);

    var work = function() {

      setTimeout(function() {

        if (!NProgress.status) return;

        NProgress.trickle();

        work();

      }, Settings.trickleSpeed);

    };

    if (Settings.trickle) work();

    return this;

  };

  /**

   * Hides the progress bar.

   * This is the *sort of* the same as setting the status to 100%, with the

   * difference being `done()` makes some placebo effect of some realistic motion.

   *

   *     NProgress.done();

   *

   * If `true` is passed, it will show the progress bar even if its hidden.

   *

   *     NProgress.done(true);

   */

  NProgress.done = function(force) {

    if (!force && !NProgress.status) return this;

    return NProgress.inc(0.3 + 0.5 * Math.random()).set(1);

  };

  /**

   * Increments by a random amount.

   */

  NProgress.inc = function(amount) {

    var n = NProgress.status;

    if (!n) {

      return NProgress.start();;

    } else if(n > 1) {

      return;

    } else {

      if (typeof amount !== 'number') {

        if (n >= 0 && n < 0.2) { amount = 0.1; }

        else if (n >= 0.2 && n < 0.5) { amount = 0.04; }

        else if (n >= 0.5 && n < 0.8) { amount = 0.02; }

        else if (n >= 0.8 && n < 0.99) { amount = 0.005; }

        else { amount = 0; }

      }

      n = clamp(n + amount, 0, 0.994);

      return NProgress.set(n);

    }

  };

  NProgress.trickle = function() {

    return NProgress.inc();

  };

  /**

   * Waits for all supplied jQuery promises and

   * increases the progress as the promises resolve.

   *

   * @param $promise jQUery Promise

   */

  (function() {

    var initial = 0, current = 0;

    NProgress.promise = function($promise) {

      if (!$promise || $promise.state() === "resolved") {

        return this;

      }

      if (current === 0) {

        NProgress.start();;

      }

      initial++;

      current++;

      $promise.always(function() {

        current--;

        if (current === 0) {

            initial = 0;

            NProgress.done();

        } else {

            NProgress.set((initial - current) / initial);

        }

      });

      return this;

    };

  })();

  /**

   * (Internal) renders the progress bar markup based on the `template`

   * setting.

   */

  NProgress.render = function(fromStart) {

    if (NProgress.isRendered()) return document.getElementById('nprogress');

    addClass(document.documentElement, 'nprogress-busy');

    var progress = document.createElement('div');

    progress.id = 'nprogress';

    progress.innerHTML = Settings.template;

    var bar = progress.querySelector(Settings.barSelector),

        perc = fromStart ? '-100' : toBarPerc(NProgress.status || 0),

        parent = isDOM(Settings.parent)

          ? Settings.parent

          : document.querySelector(Settings.parent),

        spinner

    css(bar, {

      transition: 'all 0 linear',

      transform: 'translate3d(' + perc + '%,0,0)'

    });

    if (!Settings.showSpinner) {

      spinner = progress.querySelector(Settings.spinnerSelector);

      spinner && removeElement(spinner);

    }

    if (parent != document.body) {

      addClass(parent, 'nprogress-custom-parent');

    }

    parent.appendChild(progress);

    return progress;

  };

  /**

   * Removes the element. Opposite of render().

   */

  NProgress.remove = function() {

    removeClass(document.documentElement, 'nprogress-busy');

    var parent = isDOM(Settings.parent)

      ? Settings.parent

      : document.querySelector(Settings.parent)

    removeClass(parent, 'nprogress-custom-parent')

    var progress = document.getElementById('nprogress');

    progress && removeElement(progress);

  };

  /**

   * Checks if the progress bar is rendered.

   */

  NProgress.isRendered = function() {

    return !!document.getElementById('nprogress');

  };

  /**

   * Determine which positioning CSS rule to use.

   */

  NProgress.getPositioningCSS = function() {

    // Sniff on document.body.style

    var bodyStyle = document.body.style;

    // Sniff prefixes

    var vendorPrefix = ('WebkitTransform' in bodyStyle) ? 'Webkit' :

                       ('MozTransform' in bodyStyle) ? 'Moz' :

                       ('msTransform' in bodyStyle) ? 'ms' :

                       ('OTransform' in bodyStyle) ? 'O' : '';

    if (vendorPrefix + 'Perspective' in bodyStyle) {

      // Modern browsers with 3D support, e.g. Webkit, IE10

      return 'translate3d';

    } else if (vendorPrefix + 'Transform' in bodyStyle) {

      // Browsers without 3D support, e.g. IE9

      return 'translate';

    } else {

      // Browsers without translate() support, e.g. IE7-8

      return 'margin';

    }

  };

  /**

   * Helpers

   */

  function isDOM (obj) {

    if (typeof HTMLElement === 'object') {

      return obj instanceof HTMLElement

    }

    return (

      obj &&

      typeof obj === 'object' &&

      obj.nodeType === 1 &&

      typeof obj.nodeName === 'string'

    )

  }

  function clamp(n, min, max) {

    if (n < min) return min;

    if (n > max) return max;

    return n;

  }

  /**

   * (Internal) converts a percentage (`0..1`) to a bar translateX

   * percentage (`-100%..0%`).

   */

  function toBarPerc(n) {

    return (-1 + n) * 100;

  }

  /**

   * (Internal) returns the correct CSS for changing the bar's

   * position given an n percentage, and speed and ease from Settings

   */

  function barPositionCSS(n, speed, ease) {

    var barCSS;

    if (Settings.positionUsing === 'translate3d') {

      barCSS = { transform: 'translate3d('+toBarPerc(n)+'%,0,0)' };

    } else if (Settings.positionUsing === 'translate') {

      barCSS = { transform: 'translate('+toBarPerc(n)+'%,0)' };

    } else {

      barCSS = { 'margin-left': toBarPerc(n)+'%' };

    }

    barCSS.transition = 'all '+speed+'ms '+ease;

    return barCSS;

  }

  /**

   * (Internal) Queues a function to be executed.

   */

  var queue = (function() {

    var pending = [];

    function next() {

      var fn = pending.shift();

      if (fn) {

        fn(next);

      }

    }

    return function(fn) {

      pending.push(fn);

      if (pending.length == 1) next();

    };

  })();

  /**

   * (Internal) Applies css properties to an element, similar to the jQuery

   * css method.

   *

   * While this helper does assist with vendor prefixed property names, it

   * does not perform any manipulation of values prior to setting styles.

   */

  var css = (function() {

    var cssPrefixes = [ 'Webkit', 'O', 'Moz', 'ms' ],

        cssProps    = {};

    function camelCase(string) {

      return string.replace(/^-ms-/, 'ms-').replace(/-([\da-z])/gi, function(match, letter) {

        return letter.toUpperCase();

      });

    }

    function getVendorProp(name) {

      var style = document.body.style;

      if (name in style) return name;

      var i = cssPrefixes.length,

          capName = name.charAt(0).toUpperCase() + name.slice(1),

          vendorName;

      while (i--) {

        vendorName = cssPrefixes[i] + capName;

        if (vendorName in style) return vendorName;

      }

      return name;

    }

    function getStyleProp(name) {

      name = camelCase(name);

      return cssProps[name] || (cssProps[name] = getVendorProp(name));

    }

    function applyCss(element, prop, value) {

      prop = getStyleProp(prop);

      element.style[prop] = value;

    }

    return function(element, properties) {

      var args = arguments,

          prop,

          value;

      if (args.length == 2) {

        for (prop in properties) {

          value = properties[prop];

          if (value !== undefined && properties.hasOwnProperty(prop)) applyCss(element, prop, value);

        }

      } else {

        applyCss(element, args[1], args[2]);

      }

    }

  })();

  /**

   * (Internal) Determines if an element or space separated list of class names contains a class name.

   */

  function hasClass(element, name) {

    var list = typeof element == 'string' ? element : classList(element);

    return list.indexOf(' ' + name + ' ') >= 0;

  }

  /**

   * (Internal) Adds a class to an element.

   */

  function addClass(element, name) {

    var oldList = classList(element),

        newList = oldList + name;

    if (hasClass(oldList, name)) return;

    // Trim the opening space.

    element.className = newList.substring(1);

  }

  /**

   * (Internal) Removes a class from an element.

   */

  function removeClass(element, name) {

    var oldList = classList(element),

        newList;

    if (!hasClass(element, name)) return;

    // Replace the class name.

    newList = oldList.replace(' ' + name + ' ', ' ');

    // Trim the opening and closing spaces.

    element.className = newList.substring(1, newList.length - 1);

  }

  /**

   * (Internal) Gets a space separated list of the class names on the element.

   * The list is wrapped with a single space on each end to facilitate finding

   * matches within the list.

   */

  function classList(element) {

    return (' ' + (element && element.className || '') + ' ').replace(/\s+/gi, ' ');

  }

  /**

   * (Internal) Removes an element from the DOM.

   */

  function removeElement(element) {

    element && element.parentNode && element.parentNode.removeChild(element);

  }

  return NProgress;

});