(function($) {
	"use strict";

	var MAX_ITEMS = 5;

	/* 表示順はカテゴリー一覧と揃える。
	   ただし法人FAQはインポート時に SortOrder が空のまま入っているため、
	   空のものは後ろへ回して公開日の新しい順にする。 */
	function compareItems(a, b) {
		if (a.sortOrder && b.sortOrder) {
			if (a.sortOrder < b.sortOrder) { return -1; }
			if (a.sortOrder > b.sortOrder) { return 1; }
		} else if (a.sortOrder) {
			return -1;
		} else if (b.sortOrder) {
			return 1;
		}

		if (a.published > b.published) { return -1; }
		if (a.published < b.published) { return 1; }
		return 0;
	}

	function buildItem(record) {
		var $link = $("<a>", {
			"class": "p-faqRelated__link",
			href: record.url
		});

		$link.append($("<span>", {
			"class": "p-faqRelated__mark",
			"aria-hidden": "true"
		}));
		$link.append($("<span>", {
			"class": "p-faqRelated__title",
			text: record.title
		}));

		return $("<li>", { "class": "p-faqRelated__item" }).append($link);
	}

	function initFaqRelated() {
		var $section = $(".js-faq-related");

		if (!$section.length) {
			return;
		}

		var dataUrl = $.trim($section.attr("data-related-data") || "");
		var currentId = $.trim($section.attr("data-entry-id") || "");
		var $list = $section.find(".p-faqRelated__list");

		if (!dataUrl || !currentId || !$list.length) {
			return;
		}

		$.ajax({
			url: dataUrl,
			dataType: "json",
			cache: false
		}).done(function(data) {
			var items = $.isArray(data) ? data : [];
			var currentKey = "";
			var siblings = [];

			$.each(items, function(index, item) {
				if (item && String(item.id) === currentId) {
					currentKey = $.trim(String(item.categoryKey || ""));
					return false;
				}
				return true;
			});

			if (!currentKey) {
				return;
			}

			$.each(items, function(index, item) {
				if (!item || String(item.id) === currentId) {
					return true;
				}
				if ($.trim(String(item.categoryKey || "")) !== currentKey) {
					return true;
				}
				siblings.push({
					title: String(item.title || ""),
					url: String(item.url || ""),
					sortOrder: $.trim(String(item.sortOrder || "")),
					published: String(item.published || "")
				});
				return true;
			});

			if (!siblings.length) {
				return;
			}

			siblings.sort(compareItems);

			$.each(siblings.slice(0, MAX_ITEMS), function(index, record) {
				$list.append(buildItem(record));
			});

			$section.removeAttr("hidden");
		});
	}

	$(initFaqRelated);
})(jQuery);