(function() {
	// Initialize the TabsNav.
	var tnav = new TabsNav(document.querySelector('nav.tabsnav'), {
			movable: 'all',
			extramovable: '.content',
			layout: 'vertical',
			animeduration: 700,
			animeeasing: 'easeInOutCubic',
			animedelay: 100,
			onOpenBarsUpdate: openTabCallback,
			onOpenTab: function() {
				// Show the back button after the tab is open.
				anime({
					targets: backCtrl,
					duration: 800,
					easing: 'easeOutExpo',
					scale: [0,1],
					opacity: {
						value: 1,
						duration: 300,
						easing: 'linear'
					}
				});
			}
		}),

		// The content items and the back control.
		contentItems = [].slice.call(document.querySelectorAll('.tabscontent > .tabscontent__item')),
		backCtrl = document.querySelector('.tabscontent > button.btn--back'),
		// menu ctrl for smaller screens (the tabs are not initially shown and toggling this button will show/hide the tabs)
		menuCtrl = document.querySelector('button.btn--menu'),
		isContentShown = false, current;

	function openTabCallback(anim, idx, tab) {
		if( anim.progress > 60 && !isContentShown ) {
			isContentShown = true;
			current = idx;

			var contentItem = contentItems[idx],
				content = {
					img: contentItem.querySelector('img.poster__img'),
					title: contentItem.querySelector('.poster__title'),
					deco: contentItem.querySelector('.poster__deco'),
					box: contentItem.querySelector('.poster__box'),
					number: contentItem.querySelector('.poster__number')
				};

			// Hide the content elements.
			content.img.style.opacity = content.title.style.opacity = content.deco.style.opacity = content.box.style.opacity = content.number.style.opacity = 0;
			// Show content item.
			contentItem.style.opacity = 1;
			contentItem.classList.add('tabscontent__item--current');

			// Animate content elements in.
			anime.remove([content.img, content.title, content.box, content.number, content.deco]);
			anime({
				targets: [content.img, content.title, content.box, content.number, content.deco],
				easing: 'easeOutExpo',
				duration: function(t,i) {
					return 600 + i*100;
				},
				scaleX: function(t,i) {
					return i === 0 ? [0,1] : 1;
				},
				translateX: function(t,i) {
					return [-80-i*150,0];
				},
				rotate: function(t,i) {
					return i === 2 ? [-40,0] : 0;
				},
				opacity: {
					value: 1,
					duration: 300,
					easing: 'linear'
				}
			});
		}
	}

	backCtrl.addEventListener('click', closeTabs);

	function closeTabs() {
		if( !tnav.isOpen ) return;

		var contentItem = contentItems[current],
			content = {
				img: contentItem.querySelector('img.poster__img'),
				title: contentItem.querySelector('.poster__title'),
				deco: contentItem.querySelector('.poster__deco'),
				box: contentItem.querySelector('.poster__box'),
				number: contentItem.querySelector('.poster__number')
			};

		// Hide the content elements.
		anime.remove([content.img, content.title, content.box, content.number, content.deco]);
		// Animate content elements out.
		anime({
			targets: [content.deco, content.number, content.box, content.title, content.img],
			easing: 'easeInOutCubic',
			duration: function(t,i) {
				return 600 + i*100;
			},
			delay: function(t,i,c) {
				return (c-i-1)*35;
			},
			translateX: function(t,i) {
				return [0,-200-i*150];
			},
			rotate: function(t,i) {
				return i === 2 ? [0,-40] : 0;
			},
			opacity: {
				value: 0,
				duration: 450
			},
			update: function(anim) {
				if( anim.progress > 20 && isContentShown ) {
					isContentShown = false;
					// Close tab.
					tnav.close();
				}
			},
			complete: function() {
				// Hide content item.
				contentItem.style.opacity = 0;
				contentItem.classList.remove('tabscontent__item--current');
			}
		});

		// Hide back ctrl
		anime.remove(backCtrl);
		anime({
			targets: backCtrl,
			duration: 800,
			easing: 'easeOutExpo',
			scale: [1,0],
			opacity: {
				value: 0,
				duration: 200,
				easing: 'linear'
			}
		});
	}

	menuCtrl.addEventListener('click', toggleTabs);

	function toggleTabs() {
		var state = tnav.toggleVisibility();
		if( state === 0 ) {
			menuCtrl.classList.remove('btn--menu-active');
		}
		else if( state === 1 ) {
			menuCtrl.classList.add('btn--menu-active');
		}
	}

})();