(() => {
    "use strict";

    /* ---------- мобильное меню ---------- */
    const toggle = document.getElementById("navToggle");
    const links = document.getElementById("navLinks");

    if (toggle && links) {
        toggle.addEventListener("click", () => {
            const open = links.classList.toggle("open");
            toggle.classList.toggle("open", open);
            toggle.setAttribute("aria-expanded", String(open));
        });

        links.querySelectorAll("a").forEach((a) =>
            a.addEventListener("click", () => {
                links.classList.remove("open");
                toggle.classList.remove("open");
                toggle.setAttribute("aria-expanded", "false");
            })
        );
    }

    /* ---------- тень хедера при скролле ---------- */
    const header = document.querySelector(".site-header");
    const onScroll = () => header && header.classList.toggle("scrolled", window.scrollY > 8);
    onScroll();
    window.addEventListener("scroll", onScroll, { passive: true });

    /* ---------- появление блоков ---------- */
    const reveal = document.querySelectorAll("[data-reveal]");
    if ("IntersectionObserver" in window) {
        const io = new IntersectionObserver(
            (entries) => {
                entries.forEach((entry, i) => {
                    if (entry.isIntersecting) {
                        const el = entry.target;
                        setTimeout(() => el.classList.add("visible"), i * 70);
                        io.unobserve(el);
                    }
                });
            },
            { threshold: 0.12, rootMargin: "0px 0px -40px 0px" }
        );
        reveal.forEach((el) => io.observe(el));
    } else {
        reveal.forEach((el) => el.classList.add("visible"));
    }

    /* ---------- счётчики ---------- */
    const counters = document.querySelectorAll("[data-count]");
    const animateCount = (el) => {
        const target = parseInt(el.dataset.count, 10);
        const duration = 1400;
        const start = performance.now();
        const step = (now) => {
            const p = Math.min((now - start) / duration, 1);
            const eased = 1 - Math.pow(1 - p, 3);
            el.textContent = Math.round(target * eased).toString();
            if (p < 1) requestAnimationFrame(step);
        };
        requestAnimationFrame(step);
    };

    if ("IntersectionObserver" in window) {
        const co = new IntersectionObserver(
            (entries) => {
                entries.forEach((entry) => {
                    if (entry.isIntersecting) {
                        animateCount(entry.target);
                        co.unobserve(entry.target);
                    }
                });
            },
            { threshold: 0.5 }
        );
        counters.forEach((el) => co.observe(el));
    } else {
        counters.forEach((el) => (el.textContent = el.dataset.count));
    }

    /* ---------- печатающийся терминал ---------- */
    const typed = document.getElementById("typed");
    if (typed) {
        const lines = [
            { t: '<span class="prompt">$</span> docker ps --format "table {{.Names}}\\t{{.Status}}"', d: 22 },
            { t: "\n", d: 0 },
            { t: '<span class="dim">NAMES        STATUS</span>\n', d: 14 },
            { t: "gitea        <span class=\"ok\">Up 14 months</span>\n", d: 14 },
            { t: "matrix       <span class=\"ok\">Up 14 months</span>\n", d: 14 },
            { t: "sharkey      <span class=\"ok\">Up 14 months</span>\n", d: 14 },
            { t: "copyparty    <span class=\"ok\">Up 14 months</span>\n", d: 14 },
            { t: "grafana      <span class=\"ok\">Up 14 months</span>\n", d: 14 },
            { t: "4get         <span class=\"ok\">Up 14 months</span>\n", d: 14 },
            { t: '<span class="prompt">$</span> uptime', d: 22 },
            { t: '\n <span class="ok">all systems nominal</span>', d: 14 },
            { t: '<span class="prompt">$</span> ', d: 22 },
        ];

        // токенизируем: HTML-теги — атомарные, текст — посимвольно
        const tokenize = (str) => str.match(/<[^>]+>|./gs) || [];

        let lineIndex = 0;
        let tokens = [];
        let pos = 0;
        let html = "";

        const render = () => {
            typed.innerHTML = html + '<span class="cursor"></span>';
        };

        const typeNext = () => {
            if (lineIndex >= lines.length) {
                render();
                return;
            }

            if (pos === 0) tokens = tokenize(lines[lineIndex].t);

            if (pos < tokens.length) {
                html += tokens[pos++];
                render();
                const step = tokens[pos - 1].startsWith("<")
                    ? 0
                    : lines[lineIndex].d + Math.random() * 35;
                setTimeout(typeNext, step);
            } else {
                lineIndex++;
                pos = 0;
                setTimeout(typeNext, 190);
            }
        };

        const startTyping = () => setTimeout(typeNext, 500);

        if ("IntersectionObserver" in window) {
            const to = new IntersectionObserver(
                (entries) => {
                    entries.forEach((entry) => {
                        if (entry.isIntersecting) {
                            startTyping();
                            to.disconnect();
                        }
                    });
                },
                { threshold: 0.3 }
            );
            to.observe(typed);
        } else {
            startTyping();
        }
    }
})();