// Dennis: Kontaktseite – Scroll-Reveal und Formular-Logik.

// ----- Scroll-Reveal -----
(function () {
    const elements = document.querySelectorAll(".kontakt-seite .reveal");
    if (!elements.length) return;

    const reduceMotion = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

    if (reduceMotion || !("IntersectionObserver" in window)) {
        elements.forEach(function (el) {
            el.classList.add("visible");
        });
        return;
    }

    const observer = new IntersectionObserver(
        function (entries) {
            entries.forEach(function (entry) {
                if (entry.isIntersecting) {
                    entry.target.classList.add("visible");
                    observer.unobserve(entry.target);
                }
            });
        },
        { threshold: 0.12, rootMargin: "0px 0px -40px 0px" }
    );

    elements.forEach(function (el) {
        observer.observe(el);
    });
})();

// ----- Kontaktformular -----
(function () {
    const form = document.getElementById("kontakt-formular");
    if (!form) return;

    const MIN_MESSAGE = 10;
    const EMAIL_TARGET = "info@trihub.de";

    const fields = {
        name: form.querySelector("[name='name']"),
        email: form.querySelector("[name='email']"),
        phone: form.querySelector("[name='phone']"),
        type: form.querySelector("[name='anfragetyp']"),
        subject: form.querySelector("[name='betreff']"),
        message: form.querySelector("[name='nachricht']")
    };

    const statusEl = document.getElementById("form-status");

    function wrap(el) {
        return el.closest(".field");
    }

    function setFieldState(el, state) {
        const box = wrap(el);
        if (!box) return;
        box.classList.remove("has-error", "is-ok");
        el.classList.remove("invalid", "valid");
        if (state === "error") {
            box.classList.add("has-error");
            el.classList.add("invalid");
        } else if (state === "ok") {
            box.classList.add("is-ok");
            el.classList.add("valid");
        }
    }

    function validateName() {
        const ok = fields.name.value.trim().length > 0;
        setFieldState(fields.name, ok ? null : "error");
        return ok;
    }

    function validateEmail() {
        const value = fields.email.value.trim();
        const ok = /^[^\s@]+@[^\s@]+\.[^\s@]{2,}$/.test(value);
        setFieldState(fields.email, ok ? null : "error");
        return ok;
    }

    function validateType() {
        const ok = fields.type.value !== "";
        setFieldState(fields.type, ok ? null : "error");
        return ok;
    }

    function validateSubject() {
        const ok = fields.subject.value.trim().length > 0;
        setFieldState(fields.subject, ok ? null : "error");
        return ok;
    }

    function validateMessage() {
        const len = fields.message.value.trim().length;
        if (len === 0) {
            setFieldState(fields.message, "error");
            return false;
        }
        if (len >= MIN_MESSAGE) {
            setFieldState(fields.message, "ok");
            return true;
        }
        // Zu kurz: erst bei Submit als Fehler markieren, live nur grün bei erfüllt.
        setFieldState(fields.message, null);
        return false;
    }

    function allValid() {
        return (
            fields.name.value.trim().length > 0 &&
            /^[^\s@]+@[^\s@]+\.[^\s@]{2,}$/.test(fields.email.value.trim()) &&
            fields.type.value !== "" &&
            fields.subject.value.trim().length > 0 &&
            fields.message.value.trim().length >= MIN_MESSAGE
        );
    }

    function updateSubmitState() {
        const submit = form.querySelector("[type='submit']");
        if (submit) {
            submit.disabled = !allValid();
        }
    }

    // Live-Feedback: Nachricht wird bei 10+ Zeichen grün markiert.
    fields.message.addEventListener("input", function () {
        validateMessage();
        updateSubmitState();
    });

    ["name", "email", "subject"].forEach(function (key) {
        fields[key].addEventListener("blur", function () {
            if (fields[key].value.trim() !== "" || form.dataset.touched === "true") {
                ({ name: validateName, email: validateEmail, subject: validateSubject })[key]();
            }
        });
    });

    fields.type.addEventListener("change", validateType);

    form.addEventListener("submit", function (event) {
        event.preventDefault();
        form.dataset.touched = "true";

        const okName = validateName();
        const okEmail = validateEmail();
        const okType = validateType();
        const okSubject = validateSubject();
        const okMessage = validateMessage();

        if (!(okName && okEmail && okType && okSubject && okMessage)) {
            showStatus("error", "Bitte überprüfe die markierten Felder und versuche es erneut.");
            return;
        }

        const subject = fields.subject.value.trim();
        const typeLabel = fields.type.options[fields.type.selectedIndex].text;
        const body = [
            "Name: " + fields.name.value.trim(),
            "E-Mail: " + fields.email.value.trim(),
            "Telefon: " + (fields.phone.value.trim() || "–"),
            "Anfrage-Typ: " + typeLabel,
            "",
            fields.message.value.trim()
        ].join("\n");

        // Statische Seite ohne Backend: E-Mail-Programm wird mit allen Angaben geöffnet.
        window.location.href =
            "mailto:" + EMAIL_TARGET +
            "?subject=" + encodeURIComponent("Ernährungsberatung – " + subject) +
            "&body=" + encodeURIComponent(body);

        showStatus(
            "ok",
            "Danke! Dein E-Mail-Programm wurde geöffnet. Sende die Nachricht ab – wir melden uns zeitnah bei dir."
        );
        form.reset();
        Object.values(fields).forEach(function (el) {
            setFieldState(el, null);
        });
        updateSubmitState();
    });

    function showStatus(kind, text) {
        if (!statusEl) return;
        statusEl.textContent = kind === "ok" ? "✓ " + text : "✗ " + text;
        statusEl.className =
            "form-status is-visible " + (kind === "ok" ? "form-status--ok" : "form-status--error");
    }

    updateSubmitState();
})();