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

(function () {
  "use strict";

  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;
        var delay = Math.min(i, 4) * 70;
        setTimeout(function () { entry.target.classList.add("in"); }, delay);
        obs.unobserve(entry.target);
      });
    }, { threshold: 0.15, rootMargin: "0px 0px -8% 0px" });
    reveals.forEach(function (el) { io.observe(el); });
  }

  /* ── 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();
})();