/*
 * L.Browser handles different browser and feature detections for internal Leaflet use.
 */

(function () {

	var ua = navigator.userAgent.toLowerCase(),
	    doc = document.documentElement,

	    ie = 'ActiveXObject' in window,

	    webkit    = ua.indexOf('webkit') !== -1,
	    phantomjs = ua.indexOf('phantom') !== -1,
	    android23 = ua.search('android [23]') !== -1,
	    chrome    = ua.indexOf('chrome') !== -1,

	    mobile = typeof orientation !== 'undefined',
	    msPointer = navigator.msPointerEnabled && navigator.msMaxTouchPoints && !window.PointerEvent,
	    pointer = (window.PointerEvent && navigator.pointerEnabled && navigator.maxTouchPoints) || msPointer,

	    ie3d = ie && ('transition' in doc.style),
	    webkit3d = ('WebKitCSSMatrix' in window) && ('m11' in new window.WebKitCSSMatrix()) && !android23,
	    gecko3d = 'MozPerspective' in doc.style,
	    opera3d = 'OTransition' in doc.style;


	var retina = 'devicePixelRatio' in window && window.devicePixelRatio > 1;

	if (!retina && 'matchMedia' in window) {
		var matches = window.matchMedia('(min-resolution:144dpi)');
		retina = matches && matches.matches;
	}

	var touch = !window.L_NO_TOUCH && !phantomjs && (pointer || 'ontouchstart' in window ||
			(window.DocumentTouch && document instanceof window.DocumentTouch));

	L.Browser = {
		ie: ie,
		ielt9: ie && !document.addEventListener,
		webkit: webkit,
		gecko: (ua.indexOf('gecko') !== -1) && !webkit && !window.opera && !ie,
		android: ua.indexOf('android') !== -1,
		android23: android23,
		chrome: chrome,
		safari: !chrome && ua.indexOf('safari') !== -1,

		ie3d: ie3d,
		webkit3d: webkit3d,
		gecko3d: gecko3d,
		opera3d: opera3d,
		any3d: !window.L_DISABLE_3D && (ie3d || webkit3d || gecko3d || opera3d) && !phantomjs,

		mobile: mobile,
		mobileWebkit: mobile && webkit,
		mobileWebkit3d: mobile && webkit3d,
		mobileOpera: mobile && window.opera,

		touch: !!touch,
		msPointer: !!msPointer,
		pointer: !!pointer,

		retina: !!retina
	};

}());