/* 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: 'ease',
    positionusing: '',
    speed: 200,
    trickle: true,
    tricklerate: 0.02,
    tricklespeed: 800,
    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 (typeof amount !== 'number') {
        amount = (1 - n) * clamp(math.random() * n, 0.1, 0.95);
      }

      n = clamp(n + amount, 0, 0.994);
      return nprogress.set(n);
    }
  };

  nprogress.trickle = function() {
    return nprogress.inc(math.random() * settings.tricklerate);
  };

  /**
   * 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   = 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');
    removeclass(document.queryselector(settings.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 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.classname || '') + ' ').replace(/\s+/gi, ' ');
  }

  /**
   * (internal) removes an element from the dom.
   */

  function removeelement(element) {
    element && element.parentnode && element.parentnode.removechild(element);
  }

  return nprogress;
});