(function () {
	'use strict';

	function normalizeText(value) {
		return (value || '')
			.normalize('NFD')
			.replace(/[\u0300-\u036f]/g, '')
			.replace(/đ/g, 'd')
			.replace(/Đ/g, 'D')
			.replace(/\s+/g, ' ')
			.trim()
			.toUpperCase();
	}

	function initSearchCommand() {
		var search = document.getElementById('s');
		if (!search) {
			return;
		}

		document.addEventListener('keydown', function (event) {
			var target = event.target;
			var isTyping = target && /INPUT|TEXTAREA|SELECT/.test(target.tagName);
			if (event.key === '/' && !isTyping && !event.metaKey && !event.ctrlKey && !event.altKey) {
				event.preventDefault();
				search.focus();
			}
			if (event.key === 'Escape' && document.activeElement === search) {
				search.blur();
			}
		});
	}

	function enhanceScienceLibrary() {
		var body = document.body;
		if (!body.classList.contains('rensei-science-hub-page')) {
			return;
		}

		var content = document.querySelector('.rensei-inner-main .entry-content');
		if (!content) {
			return;
		}

		var links = Array.prototype.filter.call(content.querySelectorAll('a[href]'), function (link) {
			return link.textContent.trim().length > 0;
		});
		if (!links.length) {
			return;
		}

		var isLibrary = body.classList.contains('page-id-19863');
		var grid = document.createElement('div');
		grid.className = 'rensei-science-grid ' + (isLibrary ? 'rensei-science-grid--grades' : 'rensei-science-grid--topics');

		links.forEach(function (source, index) {
			var card = document.createElement('a');
			var label = source.textContent.trim();
			var cardIndex = document.createElement('span');
			var icon = document.createElement('span');
			var iconGlyph = document.createElement('i');
			var copy = document.createElement('span');
			var type = document.createElement('small');
			var title = document.createElement('strong');
			var hint = document.createElement('em');
			var arrow = document.createElement('span');
			var arrowGlyph = document.createElement('i');
			card.className = 'rensei-science-card';
			card.href = source.href;
			cardIndex.className = 'rensei-science-card__index';
			cardIndex.textContent = String(index + 1).padStart(2, '0');
			icon.className = 'rensei-science-card__icon';
			iconGlyph.className = 'fa ' + (isLibrary ? 'fa-cubes' : 'fa-flask');
			iconGlyph.setAttribute('aria-hidden', 'true');
			icon.appendChild(iconGlyph);
			copy.className = 'rensei-science-card__copy';
			type.textContent = isLibrary ? 'GRADE MISSION' : 'SCIENCE MISSION';
			title.textContent = label;
			hint.textContent = isLibrary ? 'Mở thư viện chủ đề' : 'Bắt đầu khám phá';
			copy.append(type, title, hint);
			arrow.className = 'rensei-science-card__arrow';
			arrowGlyph.className = 'fa fa-arrow-right';
			arrowGlyph.setAttribute('aria-hidden', 'true');
			arrow.appendChild(arrowGlyph);
			card.append(cardIndex, icon, copy, arrow);
			grid.appendChild(card);
		});

		content.replaceChildren(grid);
		content.classList.add('is-enhanced');
	}

	function enhanceLegacyContent() {
		document.querySelectorAll('.rensei-about-page .entry-content').forEach(function (content) {
			Array.prototype.forEach.call(content.children, function (child) {
				if (/^(P|DIV)$/.test(child.tagName) && child.textContent.trim().length > 30) {
					child.classList.add('rensei-content-block');
				}
			});

			content.querySelectorAll('table').forEach(function (table) {
				if (table.parentElement && table.parentElement.classList.contains('rensei-table-scroll')) {
					return;
				}
				var wrapper = document.createElement('div');
				wrapper.className = 'rensei-table-scroll';
				table.parentNode.insertBefore(wrapper, table);
				wrapper.appendChild(table);
			});
		});

		if (document.body.classList.contains('page-id-17')) {
			document.querySelectorAll('.entry-content h4').forEach(function (heading) {
				if (normalizeText(heading.textContent).indexOf('VI SAO NEN HOC TAI RENSEI') !== -1) {
					var row = heading.closest('.vc_row');
					if (row) {
						row.classList.add('rensei-legacy-reasons');
					}
				}
			});
		}
	}

	function enhanceScienceTopic() {
		if (!document.body.classList.contains('rensei-science-topic')) {
			return;
		}

		var copy = document.querySelector('.rensei-article-copy');
		if (!copy) {
			return;
		}

		var firstHeading = copy.querySelector('h1:first-child');
		if (firstHeading) {
			firstHeading.classList.add('rensei-duplicate-topic-title');
		}
		copy.classList.add('rensei-science-notebook');
	}

	function enhanceCareerPages() {
		if (!document.body.classList.contains('rensei-career-page')) {
			return;
		}

		document.querySelectorAll('.entry-content').forEach(function (content) {
			content.querySelectorAll('p, h2, h3, h4').forEach(function (element) {
				var text = normalizeText(element.textContent);
				if (/^(I|II|III|IV|V|VI)\.?\s/.test(text) || text.indexOf('YEU CAU HO SO') !== -1) {
					element.classList.add('rensei-career-heading');
				}
				if (text.indexOf('CV GUI VE EMAIL') !== -1 || text.indexOf('NOP HO SO') !== -1) {
					element.classList.add('rensei-career-apply');
				}
			});
			content.querySelectorAll('a[href^="mailto:"]').forEach(function (link) {
				link.classList.add('rensei-career-email');
			});
		});
	}

	function enhanceHomeModules() {
		if (!document.body.classList.contains('home')) {
			return;
		}

		var modules = [
			{ match: 'CAC MON HOC TAI RENSEI', label: 'LEARNING MISSIONS', className: 'rensei-module--courses' },
			{ match: 'KHOANH KHAC RENSEI', label: 'RENSEI MOMENTS', className: 'rensei-module--moments' },
			{ match: 'TIN TUC & SU KIEN', label: 'NEWSROOM SIGNAL', className: 'rensei-module--news' },
			{ match: 'THU VIEN HINH ANH', label: 'VISUAL DISCOVERY LAB', className: 'rensei-module--gallery' }
		];

		document.querySelectorAll('.entry-content h2.vc_custom_heading').forEach(function (heading) {
			var text = normalizeText(heading.textContent);
			modules.forEach(function (module) {
				if (text.indexOf(module.match) === -1) {
					return;
				}
				heading.setAttribute('data-rensei-module-label', module.label);
				var row = heading.closest('.vc_row');
				if (row) {
					row.classList.add('rensei-home-module', module.className);
				}
			});
		});

		document.querySelectorAll('.home .vc_btn3').forEach(function (button) {
			button.classList.add('rensei-module-button');
			if (!button.querySelector('.fa-arrow-right')) {
				var icon = document.createElement('i');
				icon.className = 'fa fa-arrow-right';
				icon.setAttribute('aria-hidden', 'true');
				button.appendChild(icon);
			}
		});

		document.querySelectorAll('.home .course-carousel').forEach(function (carousel) {
			if (carousel.querySelectorAll('.course--item').length <= 2) {
				carousel.classList.add('is-underfilled');
			}
		});
	}

	function initEnrollmentForm() {
		var form = document.getElementById('rensei-enrollment-form');
		if (!form) {
			return;
		}

		form.addEventListener('submit', function () {
			if (!form.checkValidity()) {
				return;
			}
			var button = form.querySelector('.rensei-enrollment-submit');
			if (button) {
				button.disabled = true;
				button.classList.add('is-loading');
				button.querySelector('span').textContent = 'Đang gửi hồ sơ…';
			}
		});
	}

	function initReveal() {
		var items = document.querySelectorAll('.rensei-inner-intro, .rensei-reason-card, .rensei-why-us, .rensei-science-card, .rensei-enrollment');
		if (!items.length || !('IntersectionObserver' in window) || window.matchMedia('(prefers-reduced-motion: reduce)').matches) {
			items.forEach(function (item) { item.classList.add('is-visible'); });
			return;
		}

		var observer = new IntersectionObserver(function (entries) {
			entries.forEach(function (entry) {
				if (entry.isIntersecting) {
					entry.target.classList.add('is-visible');
					observer.unobserve(entry.target);
				}
			});
		}, { threshold: 0.12 });
		items.forEach(function (item) { observer.observe(item); });
	}

	document.addEventListener('DOMContentLoaded', function () {
		initSearchCommand();
		enhanceScienceLibrary();
		enhanceLegacyContent();
		enhanceScienceTopic();
		enhanceCareerPages();
		enhanceHomeModules();
		initEnrollmentForm();
		initReveal();
	});
})();