import { packagesDetails } from "../../shared/packagesdetails.js";
import { mountBookingPage } from "../booking/booking-page.js";
import { formatMoney } from "../../shared/order-summary.js";
import { paymentNotice } from "../../shared/booking-copy.js";

document.addEventListener("DOMContentLoaded", () => {
    const container = document.getElementById("package-detail-container");
    if (!container) return;

    const params = new URLSearchParams(window.location.search);
    const pkg = packagesDetails.find((item) => item.id === params.get("id"));
    const requestedVariant = params.get("variant");
    const invalidVariant =
        requestedVariant &&
        !pkg?.variants?.some(
            (variant) => variant.variantId === requestedVariant,
        );

    if (!pkg || invalidVariant) {
        container.innerHTML = `
            <div class="package-card">
                <h1>Paket nicht gefunden</h1>
                <p>Bitte wähle ein gültiges Paket und eine passende Variante aus.</p>
                <a href="/angebotsuebersicht.html" class="package-btn">Zur Übersicht</a>
            </div>`;
        return;
    }

    document.title = `${pkg.type} – Tri-Hub Ernährungsberatung`;
    const variantsHtml = pkg.variants?.length
        ? `<div class="detail-box">
                <label for="variant-select">Wähle deine Variante</label>
                <select id="variant-select" class="variant-select">
                    ${pkg.variants
                        .map(
                            (variant) => `
                        <option value="${variant.variantId}">
                            ${variant.label} – ${formatMoney(variant.price, pkg.currency)}
                        </option>`,
                        )
                        .join("")}
                </select>
            </div>`
        : "";

    container.innerHTML = `
        <header class="detail-heading">
            <div class="package-type-container">
                <span class="package-type">${pkg.type} · <span id="package-duration"></span></span>
                ${pkg.badge ? `<span class="package-highlight">${pkg.badge}</span>` : ""}
            </div>
            <h1>${pkg.title}</h1>
            <p class="package-desc">${pkg.subtitle}</p>
        </header>
        <div class="detail-grid">
            <div class="detail-content">
                <section aria-labelledby="target-heading">
                    <h2 id="target-heading">Für wen ist dieses Paket ideal?</h2>
                    <ul class="detail-list">
                        ${pkg.targetGroup.map((item) => `<li>${item}</li>`).join("")}
                    </ul>
                </section>
                <section aria-labelledby="features-heading">
                    <h2 id="features-heading">Das ist im Paket enthalten</h2>
                    <ul class="detail-list">
                        ${pkg.includedFeatures.map((feature) => `<li>${feature}</li>`).join("")}
                    </ul>
                </section>
                <section aria-labelledby="steps-heading">
                    <h2 id="steps-heading">So läuft deine Begleitung ab</h2>
                    ${pkg.processSteps
                        .map(
                            (step) => `
                        <div class="process-step">
                            <strong>${step.step}</strong>
                            <p class="detail-text">${step.text}</p>
                        </div>`,
                        )
                        .join("")}
                </section>
            </div>
            <section class="package-checkout" aria-labelledby="checkout-heading">
                <h2 id="checkout-heading">Dein ${pkg.type.toLowerCase().replace(/^./, (letter) => letter.toUpperCase())}-Paket</h2>
                <div class="price-box" aria-live="polite">
                    <span class="price-amount" id="displayed-price"></span>
                    <span class="price-note">inkl. ${pkg.taxRate} % MwSt. · ${pkg.billingInterval}</span>
                    <p id="selected-duration" class="price-note"></p>
                </div>
                ${variantsHtml}
                <button id="proceed-to-booking-btn" class="package-btn primary-cta" type="button" aria-haspopup="dialog" aria-expanded="false" disabled>
                    Buchungsformular wird geladen …
                </button>
                <p class="booking-notice" id="booking-notice"></p>
                <div id="booking-root"></div>
            </section>
        </div>`;

    container.querySelector("#booking-notice").textContent = paymentNotice;
    const variantSelect = container.querySelector("#variant-select");
    if (variantSelect && requestedVariant)
        variantSelect.value = requestedVariant;
    const bookingBtn = container.querySelector("#proceed-to-booking-btn");
    const bookingRoot = container.querySelector("#booking-root");
    let cleanupBooking;
    let activeDialog;

    function prepareBooking() {
        cleanupBooking?.();
        activeDialog = null;
        bookingBtn.disabled = true;
        bookingBtn.textContent = "Buchungsformular wird geladen …";
        bookingBtn.setAttribute("aria-expanded", "false");
        bookingBtn.removeAttribute("aria-controls");
        const variant = pkg.variants?.find(
            (item) => item.variantId === variantSelect?.value,
        );
        const duration = variant
            ? `${variant.durationWeeks} Wochen Begleitung`
            : pkg.durationLabel;
        container.querySelector("#displayed-price").textContent = formatMoney(
            variant?.price ?? pkg.price,
            pkg.currency,
        );
        container.querySelector("#package-duration").textContent = duration;
        container.querySelector("#selected-duration").textContent = duration;
        cleanupBooking = mountBookingPage(bookingRoot, {
            packageId: pkg.id,
            variantId: variantSelect?.value,
        });
    }

    // Booking lädt die Paketvorschau asynchron, auch bei einem erneuten Versuch.
    const observer = new MutationObserver(() => {
        const dialog = bookingRoot.querySelector(".booking__dialog");
        if (!dialog || dialog === activeDialog) return;
        activeDialog = dialog;
        bookingBtn.disabled = false;
        bookingBtn.textContent = "Jetzt buchen";
        bookingBtn.setAttribute("aria-controls", dialog.id);
        dialog.addEventListener("close", () => {
            bookingBtn.setAttribute("aria-expanded", "false");
            bookingBtn.focus();
        });
    });
    observer.observe(bookingRoot, { childList: true, subtree: true });
    prepareBooking();
    variantSelect?.addEventListener("change", prepareBooking);

    bookingBtn.addEventListener("click", () => {
        if (!activeDialog || activeDialog.open) return;
        activeDialog.showModal();
        bookingBtn.setAttribute("aria-expanded", "true");
        const result = activeDialog.querySelector(
            ".booking__result:not([hidden])",
        );
        (result || activeDialog.querySelector('[name="name"]')).focus();
    });
});