founders-break/public/js/main.js

/* The Founder's Break - nav state, scroll reveal, live countdown, RSVP submit.
   No scroll listeners: nav state and reveal both ride IntersectionObserver. */

(function () {
  "use strict";

  var TZ = "America/New_York";
  var reduceMotion = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

  /* ── Nav background once the page has moved off the top ── */
  var nav = document.getElementById("nav");
  var sentinel = document.createElement("div");
  sentinel.style.cssText = "position:absolute;top:0;left:0;width:1px;height:1px;pointer-events:none";
  document.body.prepend(sentinel);
  new IntersectionObserver(function (entries) {
    nav.classList.toggle("scrolled", !entries[0].isIntersecting);
  }).observe(sentinel);

  /* ── Scroll reveal: sequences sections in as they arrive ── */
  var reveals = document.querySelectorAll(".reveal");
  if (reduceMotion) {
    reveals.forEach(function (el) { el.classList.add("in"); });
  } else {
    var io = new IntersectionObserver(function (entries, obs) {
      entries.forEach(function (entry, i) {
        if (!entry.isIntersecting) return;
        setTimeout(function () { entry.target.classList.add("in"); }, Math.min(i, 4) * 70);
        obs.unobserve(entry.target);
      });
    }, { threshold: 0.15, rootMargin: "0px 0px -8% 0px" });
    reveals.forEach(function (el) { io.observe(el); });
  }

  /* ── Live countdown ──────────────────────────────────────
     Mirrors the rule in views/index.ejs so the clock keeps itself honest
     without a reload: once an event ends, it rolls to the following week
     on its own, skipping any cancelled date. */

  var el = document.getElementById("countdown");
  if (el) startCountdown(el);

  function etParts(date) {
    // "2026-08-27" plus the weekday index, both in Eastern time.
    var ymd = new Intl.DateTimeFormat("en-CA", {
      timeZone: TZ, year: "numeric", month: "2-digit", day: "2-digit",
    }).format(date);
    var wd = new Intl.DateTimeFormat("en-US", { timeZone: TZ, weekday: "short" }).format(date);
    var order = { Sun: 0, Mon: 1, Tue: 2, Wed: 3, Thu: 4, Fri: 5, Sat: 6 };
    return { iso: ymd, day: order[wd] };
  }

  function etOffsetHours(iso) {
    var label = new Intl.DateTimeFormat("en-US", { timeZone: TZ, timeZoneName: "shortOffset" })
      .format(new Date(iso + "T12:00:00Z"));
    var m = label.match(/GMT([+-]?\d{1,2})/);
    return m ? parseInt(m[1], 10) : -5;
  }

  function instantFor(iso, hour) {
    var p = iso.split("-").map(Number);
    return new Date(Date.UTC(p[0], p[1] - 1, p[2], hour - etOffsetHours(iso), 0, 0));
  }

  function startCountdown(root) {
    var weekday = Number(root.dataset.weekday);
    var startHour = Number(root.dataset.startHour);
    var endHour = Number(root.dataset.endHour);
    var first = root.dataset.first;
    var cancelled = (root.dataset.cancelled || "").split(",").filter(Boolean);

    var nums = {};
    root.querySelectorAll("[data-unit]").forEach(function (n) { nums[n.dataset.unit] = n; });
    var label = document.getElementById("countdown-label");
    var when = document.getElementById("countdown-when");
    var clock = document.getElementById("countdown-clock");

    function nextOccurrence(now) {
      var today = etParts(now);
      var parts = today.iso.split("-").map(Number);
      var cur = new Date(Date.UTC(parts[0], parts[1] - 1, parts[2]));
      var firstParts = first.split("-").map(Number);
      var firstDate = new Date(Date.UTC(firstParts[0], firstParts[1] - 1, firstParts[2]));
      if (cur < firstDate) cur = firstDate;

      var iso = function (d) { return d.toISOString().slice(0, 10); };
      while (cur.getUTCDay() !== weekday) cur.setUTCDate(cur.getUTCDate() + 1);
      // Only roll past today once the night is actually over.
      if (iso(cur) === today.iso && now >= instantFor(today.iso, endHour)) {
        cur.setUTCDate(cur.getUTCDate() + 7);
      }
      while (cancelled.indexOf(iso(cur)) !== -1) cur.setUTCDate(cur.getUTCDate() + 7);
      return iso(cur);
    }

    function render() {
      var now = new Date();
      var iso = nextOccurrence(now);
      var start = instantFor(iso, startHour);
      var end = instantFor(iso, endHour);

      var pretty = new Intl.DateTimeFormat("en-US", {
        timeZone: TZ, weekday: "long", month: "long", day: "numeric",
      }).format(start);

      if (now >= start && now < end) {
        root.classList.add("is-live");
        label.textContent = "Happening right now";
        clock.hidden = true;
        when.textContent = "Until " + fmtTime(end) + " tonight. Come find us at the tables.";
        return;
      }

      root.classList.remove("is-live");
      clock.hidden = false;
      var diff = Math.max(0, start - now);
      var total = Math.floor(diff / 1000);
      set("days", Math.floor(total / 86400));
      set("hours", Math.floor(total / 3600) % 24);
      set("minutes", Math.floor(total / 60) % 60);
      set("seconds", total % 60);

      label.textContent = total < 86400 ? "The Break is tonight" : "Until the next Break";
      when.textContent = pretty + ", " + fmtTime(start) + " at Silver Q";
    }

    function fmtTime(d) {
      return new Intl.DateTimeFormat("en-US", { timeZone: TZ, hour: "numeric", minute: "2-digit" }).format(d);
    }

    function set(unit, value) {
      var node = nums[unit];
      if (!node) return;
      var text = unit === "days" ? String(value) : String(value).padStart(2, "0");
      if (node.textContent === text) return;
      node.textContent = text;
      if (reduceMotion) return;
      node.classList.remove("tick");
      void node.offsetWidth; // restart the animation
      node.classList.add("tick");
    }

    render();
    var timer = setInterval(render, 1000);
    // A backgrounded tab throttles the interval; catch up the moment it returns.
    document.addEventListener("visibilitychange", function () {
      if (!document.hidden) render();
    });
    window.addEventListener("pagehide", function () { clearInterval(timer); });
  }

  /* ── RSVP ── */
  var form = document.getElementById("rsvp-form");
  if (!form) return;

  var submit = document.getElementById("rsvp-submit");
  var status = document.getElementById("form-status");
  var done = document.getElementById("rsvp-done");
  var nameField = document.getElementById("f-name");
  var emailField = document.getElementById("f-email");

  function setError(input, message) {
    var field = input.closest(".field");
    field.classList.toggle("has-error", Boolean(message));
    var slot = field.querySelector(".field-error");
    if (slot) slot.textContent = message || "";
    input.setAttribute("aria-invalid", message ? "true" : "false");
  }

  function validate() {
    var ok = true;
    if (!nameField.value.trim()) { setError(nameField, "We need a name to put on the list."); ok = false; }
    else setError(nameField, "");

    var email = emailField.value.trim();
    if (!email) { setError(emailField, "We need an email to send the reminder to."); ok = false; }
    else if (!/^[^\s@]+@[^\s@]+\.[^\s@]{2,}$/.test(email)) { setError(emailField, "That email does not look right."); ok = false; }
    else setError(emailField, "");

    return ok;
  }

  [nameField, emailField].forEach(function (input) {
    input.addEventListener("input", function () {
      if (input.closest(".field").classList.contains("has-error")) validate();
    });
  });

  form.addEventListener("submit", function (event) {
    event.preventDefault();
    status.textContent = "";

    if (!validate()) {
      form.querySelector(".has-error input").focus();
      return;
    }

    submit.setAttribute("aria-busy", "true");

    var payload = new URLSearchParams();
    new FormData(form).forEach(function (value, key) {
      if (key !== "_redirect") payload.append(key, value);
    });

    fetch(form.action, {
      method: "POST",
      headers: {
        "Content-Type": "application/x-www-form-urlencoded;charset=UTF-8",
        Accept: "application/json",
      },
      body: payload.toString(),
    })
      .then(function (res) {
        if (!res.ok) throw new Error("HTTP " + res.status);
        return res.json().catch(function () { return { ok: true }; });
      })
      .then(function (body) {
        if (body && body.ok === false) throw new Error(body.error || "rejected");
        showDone();
      })
      .catch(function () {
        submit.removeAttribute("aria-busy");
        status.textContent =
          "That did not go through. Try again, or email contact@onetouch.studio and we will add you by hand.";
      });
  });

  function showDone() {
    form.hidden = true;
    done.hidden = false;
    done.setAttribute("tabindex", "-1");
    done.focus({ preventScroll: true });
  }

  /* No-JS fallback lands back here with ?rsvp=ok after the plain form POST. */
  if (new URLSearchParams(window.location.search).get("rsvp") === "ok") showDone();
})();