describe('TileLayer', function () {

	var div, map;

	// Placekitten via http://placekitten.com/attribution.html
	// Image licensed under CC-by-sa by http://flickr.com/photos/lachlanrogers/

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	beforeEach(function () {
		div = document.createElement('div');
		div.style.width = '800px';
		div.style.height = '600px';
		div.style.visibility = 'hidden';

		document.body.appendChild(div);

		map = L.map(div);
	});

	afterEach(function () {
		document.body.removeChild(div);
	});

	function kittenLayerFactory(options) {
		return L.tileLayer(placeKitten, options || {});
	}

	describe("number of kittens loaded", function () {

		var clock, kittenLayer, counts;

		// animationFrame helper, just runs requestAnimFrame() a given number of times
		function runFrames(n) {
			return _runFrames(n)();
		}

		function _runFrames(n) {
			if (n) {
				return function () {
					clock.tick(40); // 40msec/frame ~= 25fps
					map.fire('_frame');
					L.Util.requestAnimFrame(_runFrames(n - 1));
				};
			} else {
				return L.Util.falseFn;
			}
		}

		beforeEach(function () {
			clock = sinon.useFakeTimers();

			kittenLayer = kittenLayerFactory();

			counts = {
				tileload: 0,
				tileerror: 0,
				tileloadstart: 0,
				tileunload: 0
			};

			kittenLayer.on('tileload tileunload tileerror tileloadstart', function (ev) {
// 				console.log(ev.type);
				counts[ev.type]++;
			});
// 			grid.on('tileunload', function (ev) {
// 				console.log(ev.type, ev.coords, counts);
// 			});

			map.options.fadeAnimation = false;
			map.options.zoomAnimation = false;
		});

		afterEach(function () {
			clock.restore();
			kittenLayer.off();
			kittenLayer = undefined;
			counts = undefined;
		});

		it("Loads 8 kittens zoom 1", function (done) {

			kittenLayer.on('load', function () {
				expect(counts.tileloadstart).to.be(8);
				expect(counts.tileload).to.be(8);
				expect(counts.tileunload).to.be(0);
				expect(kittenLayer._container.querySelectorAll('img').length).to.be(8);
				done();
			});

			map.addLayer(kittenLayer).setView([0, 0], 1);
			clock.tick(250);
		});


		// NOTE: This test has different behaviour in PhantomJS and graphical
		// browsers due to CSS animations!
		it.skipInPhantom("Loads 290, unloads 275 kittens on MAD-TRD flyTo()", function (done) {

			this.timeout(10000); // This test takes longer than usual due to frames

			var mad = [40.40, -3.7], trd = [63.41, 10.41];

			kittenLayer.on('load', function () {
				expect(counts.tileloadstart).to.be(12);
				expect(counts.tileload).to.be(12);
				expect(counts.tileunload).to.be(0);
				kittenLayer.off('load');

				map.on('zoomend', function () {
					expect(counts.tileloadstart).to.be(290);
					expect(counts.tileunload).to.be(275);

					// image tiles take time, so then might not be fully loaded yet.
					expect(counts.tileload).to.be.lessThan(counts.tileloadstart + 1);
					expect(counts.tileload).to.be.greaterThan(counts.tileunload);
					expect(kittenLayer._container.querySelectorAll('img').length).to.be(15);
					done();
				});

				map.flyTo(trd, 12, {animate: true});

	// 				map.on('_frame', function () {
	// 					console.log('frame', counts);
	// 				});

				runFrames(500);
			});

			map.addLayer(kittenLayer).setView(mad, 12);
			clock.tick(250);
		});

	});


});