(() => {
    // Shared with the console (useTheme.ts, index.html) so one choice applies everywhere.
    const THEME_KEY = 'floci-theme';
    const root = document.documentElement;
    const buttons = document.querySelectorAll('.tg button');
    const reducedMotion = matchMedia('(prefers-reduced-motion: reduce)').matches;

    function setTheme(theme) {
        root.setAttribute('data-theme', theme);
        try {
            localStorage.setItem(THEME_KEY, theme);
        } catch (ignored) {
            // Theme persistence is optional when browser storage is unavailable.
        }
        buttons.forEach((button) => button.classList.toggle('on', button.dataset.t === theme));
    }

    let initialTheme = matchMedia('(prefers-color-scheme: light)').matches ? 'light' : 'dark';
    try {
        const savedTheme = localStorage.getItem(THEME_KEY) ?? localStorage.getItem('thecloud-theme');
        if (savedTheme === 'dark' || savedTheme === 'light' || savedTheme === 'cyber') {
            initialTheme = savedTheme;
        }
    } catch (ignored) {
        // The OS preference remains the fallback when browser storage is unavailable.
    }
    setTheme(initialTheme);

    buttons.forEach((button) => button.addEventListener('click', () => setTheme(button.dataset.t)));
    document.addEventListener('keydown', (event) => {
        if ((event.key === 't' || event.key === 'T') && !event.metaKey && !event.ctrlKey && !event.altKey && !/INPUT|TEXTAREA/.test(event.target.tagName)) {
            const themes = ['dark', 'light', 'cyber'];
            setTheme(themes[(themes.indexOf(root.getAttribute('data-theme')) + 1) % themes.length]);
        }
    });

    const lines = ['hello, engineer.', 'aws s3 mb s3://my-bucket', 'your own AWS, on your own hardware.', 'sfn start-execution --local', 'welcome to TheCloud.'];
    const typewriter = document.getElementById('tw');
    let line = 0;
    let count = 0;
    let deleting = false;
    if (reducedMotion) {
        typewriter.textContent = lines[2];
    } else {
        function type() {
            const word = lines[line];
            if (deleting) {
                count--;
                typewriter.textContent = word.slice(0, count);
                if (count === 0) {
                    deleting = false;
                    line = (line + 1) % lines.length;
                    setTimeout(type, 400);
                    return;
                }
                setTimeout(type, 35);
                return;
            }
            count++;
            typewriter.textContent = word.slice(0, count);
            if (count === word.length) {
                deleting = true;
                setTimeout(type, 2200);
                return;
            }
            setTimeout(type, 75 + Math.random() * 50);
        }
        type();
    }

    const hero = document.getElementById('top');
    const glow = document.getElementById('grid-glow');
    if (!reducedMotion) {
        hero.addEventListener('mousemove', (event) => {
            const rect = hero.getBoundingClientRect();
            glow.style.left = `${event.clientX - rect.left}px`;
            glow.style.top = `${event.clientY - rect.top}px`;
            glow.style.opacity = '1';
        });
        hero.addEventListener('mouseleave', () => {
            glow.style.opacity = '0';
        });
    }

    const progress = document.getElementById('bar');
    addEventListener('scroll', () => {
        const height = document.documentElement.scrollHeight - innerHeight;
        progress.style.width = `${height > 0 ? scrollY / height * 100 : 0}%`;
    }, {passive: true});

    const form = document.querySelector('[data-sso-form]');
    if (form) {
        form.addEventListener('submit', () => {
            const button = form.querySelector('.btn');
            button.classList.add('is-loading');
            button.disabled = true;
            document.getElementById('label').textContent = 'Redirecting...';
        });
    }

    const copy = document.getElementById('cp');
    if (copy) {
        copy.addEventListener('click', () => {
            navigator.clipboard.writeText(document.getElementById('code').innerText).then(() => {
                copy.textContent = 'copied';
                copy.classList.add('ok');
                setTimeout(() => {
                    copy.textContent = 'copy';
                    copy.classList.remove('ok');
                }, 1800);
            });
        });
    }
})();