(function () {
            fetch("../notices.json?v=" + Math.floor(Date.now() / 300000), { cache: "no-store" })
                .then(function (response) {
                    if (!response.ok) {
                        throw new Error("notice source unavailable");
                    }
                    return response.json();
                })
                .then(function (payload) {
                    var notices = Array.isArray(payload) ? payload : payload.notices;
                    var notice = Array.isArray(notices) && notices.find(function (item) {
                        return item && item.enabled !== false;
                    });

                    if (notice) {
                        renderNotice(notice);
                    }
                })
                .catch(function () {});

            function renderNotice(notice) {
                setText("noticeTitle", notice.title || "重要通知");
                setText("noticeSummary", notice.message || "");
                setText("noticeBadge", notice.badge || "通知");
                setText("noticeLevel", String(notice.level || "info").toUpperCase());
                setText("articleTitle", notice.title || "重要通知");
                setText("articleMessage", notice.message || "");
                setText("noticeDate", formatDate(notice.startsAt) || "未设置开始时间");
                setText("noticeWindow", formatWindow(notice.startsAt, notice.endsAt));
            }

            function setText(id, text) {
                var node = document.getElementById(id);
                if (node) {
                    node.textContent = text;
                }
            }

            function formatDate(value) {
                if (!value) {
                    return "";
                }

                var date = new Date(value);
                if (Number.isNaN(date.getTime())) {
                    return "";
                }

                return date.toLocaleDateString("zh-CN", {
                    year: "numeric",
                    month: "2-digit",
                    day: "2-digit"
                });
            }

            function formatWindow(start, end) {
                var startText = formatDate(start);
                var endText = formatDate(end);

                if (startText && endText) {
                    return startText + " 至 " + endText;
                }

                if (startText) {
                    return startText + " 起生效";
                }

                return "长期有效";
            }
        })();