{% extends "base.html" %}

{% block title %}Buchung prüfen & abschließen{% endblock %}

{% block head %}
{{ super() }}
<style>
    .booking-review {
        max-width: 920px;
        margin: 2rem auto 3rem;
        padding: 0;
    }

    .booking-review__panel {
        background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(244, 247, 244, 0.96));
        border: 1px solid rgba(28, 90, 99, 0.14);
        border-radius: 26px;
        padding: clamp(1.4rem, 2.6vw, 2.2rem);
        box-shadow: 0 18px 44px rgba(18, 49, 54, 0.08);
        position: relative;
        overflow: hidden;
    }

    .booking-review__eyebrow {
        display: inline-flex;
        align-items: center;
        gap: 0.45rem;
        padding: 0.42rem 0.82rem;
        border-radius: 999px;
        background: #e8f4f4;
        color: #166271;
        font-weight: 700;
        margin-bottom: 1rem;
    }

    .booking-review__grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 1rem;
        margin: 1.5rem 0;
    }

    .booking-review__card {
        background: #ffffff;
        border: 1px solid #dbe6e7;
        border-radius: 18px;
        padding: 1rem 1.1rem;
    }

    .booking-review__label {
        display: block;
        font-size: 0.88rem;
        font-weight: 700;
        text-transform: uppercase;
        color: #5e757d;
        margin-bottom: 0.45rem;
    }

    .booking-review__value {
        color: #173a42;
        font-weight: 700;
        line-height: 1.45;
    }

    .booking-review__note {
        padding: 1rem 1.1rem;
        border-radius: 18px;
        background: #f8fbfb;
        border: 1px solid #dbe6e7;
        color: #49626b;
        line-height: 1.65;
    }

    /* Formular Styles */
    .booking-review__form-grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.9rem;
        margin-top: 1.25rem;
    }
    
    .booking-review__section-title {
        grid-column: 1 / -1;
        font-size: 1.15rem;
        color: #166271;
        margin-top: 1.5rem;
        margin-bottom: 0.2rem;
        border-bottom: 2px solid #e8f4f4;
        padding-bottom: 0.5rem;
        font-weight: 700;
    }

    .booking-review__field {
        display: flex;
        flex-direction: column;
        gap: 0.35rem;
    }

    .booking-review__field--full {
        grid-column: 1 / -1;
    }

    .booking-review__field label {
        font-weight: 700;
        color: #2b4f58;
        font-size: 0.93rem;
    }

    .booking-review__field input {
        border: 1px solid #cedbdd;
        border-radius: 12px;
        background: #ffffff;
        color: #173a42;
        padding: 0.75rem 0.82rem;
    }
    
    .input-group--subdomain {
        display: flex;
        align-items: center;
    }
    
    .input-group--subdomain input {
        border-top-right-radius: 0;
        border-bottom-right-radius: 0;
        border-right: none;
        flex-grow: 1;
    }
    
    .input-group--subdomain .domain-suffix {
        background: #e8f4f4;
        border: 1px solid #cedbdd;
        padding: 0.75rem 0.82rem;
        border-top-right-radius: 12px;
        border-bottom-right-radius: 12px;
        color: #5e757d;
        font-weight: 600;
    }

    .booking-review__consent {
        padding: 0.95rem 1rem;
        border-radius: 16px;
        background: #eef6f6;
        border: 1px solid #d2e2e2;
    }

    .booking-review__consent label {
        display: flex;
        gap: 0.7rem;
        align-items: flex-start;
        font-weight: 600;
        color: #21414a;
        line-height: 1.5;
    }

    .booking-review__consent input {
        margin-top: 0.2rem;
    }

    .booking-review__actions {
        display: flex;
        flex-wrap: wrap;
        gap: 0.85rem;
        margin-top: 1.5rem;
    }

    /* Loading State UI */
    #setup-loading-state,
    #setup-success-state {
        display: none;
        text-align: center;
        padding: 3rem 1rem;
    }

    .spinner {
        width: 60px;
        height: 60px;
        border: 5px solid #e8f4f4;
        border-top-color: #166271;
        border-radius: 50%;
        animation: spin 1s linear infinite;
        margin: 0 auto 2rem;
    }

    @keyframes spin { 100% { transform: rotate(360deg); } }

    .status-messages {
        font-size: 1.1rem;
        color: #49626b;
        font-weight: 600;
        height: 2rem;
    }

    /* Success State UI */
    .success-icon {
        width: 70px;
        height: 70px;
        background: #1b8a3e;
        color: white;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 2rem;
        margin: 0 auto 1.5rem;
    }

    .credentials-box {
        background: #173a42;
        color: white;
        border-radius: 12px;
        padding: 1.5rem;
        margin: 1.5rem auto;
        max-width: 450px;
        text-align: left;
    }

    .credentials-box code {
        display: block;
        background: rgba(255,255,255,0.1);
        padding: 0.5rem;
        border-radius: 6px;
        margin-top: 0.3rem;
        font-size: 1.1rem;
        user-select: all;
    }

    .warning-text {
        color: #b02a37;
        font-weight: 700;
        background: #f8d7da;
        padding: 1rem;
        border-radius: 8px;
        margin-bottom: 1.5rem;
    }
    
    .btn.success-btn {
        background-color: #1b8a3e;
        border-color: #1b8a3e;
        color: #fff;
    }
    .btn.success-btn:hover {
        background-color: #146c2e;
        border-color: #146c2e;
    }

    @media (max-width: 720px) {
        .booking-review__grid, .booking-review__form-grid { grid-template-columns: 1fr; }
        .booking-review__actions { flex-direction: column; }
        .booking-review__actions .btn { width: 100%; min-width: 0; }
    }
    
    /* Verstecke UI-Elemente beim Drucken */
    @media print {
        header, footer, nav, .booking-review__actions { display: none !important; }
        body { background: white; }
        .booking-review__panel { box-shadow: none; border: none; padding: 0; }
    }
</style>
{% endblock %}

{% block content %}
<section class="booking-review">
    <div class="booking-review__panel">
        
        <!-- ========================================== -->
        <!-- STATE 1: FORMULAR (Checkout)               -->
        <!-- ========================================== -->
        <div id="checkout-form-state">
            <span class="booking-review__eyebrow">Buchung prüfen & abschließen</span>
            <h1>{{ title }}</h1>
            
            <div class="booking-review__grid">
                <div class="booking-review__card">
                    <span class="booking-review__label">Paket</span>
                    <div class="booking-review__value">{{ package }}</div>
                </div>
                <!-- OPTIMIERT: Eindeutiger Hinweis auf Rechnungsstellung -->
                <div class="booking-review__card" style="border-left: 4px solid #1b8a3e;">
                    <span class="booking-review__label">Zahlungsart</span>
                    <div class="booking-review__value" style="color: #1b8a3e;">Kauf auf Rechnung</div>
                    <small style="color: #5e757d; font-weight: 600;">30 Tage Zahlungsziel nach Bereitstellung</small>
                </div>
            </div>

            <div class="booking-review__note">
                Die Software-Instanz wird nach dem Absenden <strong>sofort für 30 Tage freigeschaltet</strong>. Die finale Laufzeit aktiviert sich automatisch nach Zahlungseingang durch Ihren Schulträger.
            </div>

            <form id="checkout-form" method="POST" action="{{ url_for('booking_payment_async') }}">
                <input type="hidden" name="package" value="{{ package_key }}">
                
                <div class="booking-review__form-grid">
                    <div class="booking-review__section-title">1. Angaben zur Schule & Ansprechpartner</div>
                    <div class="booking-review__field">
                        <label for="school_name">Name der Schule *</label>
                        <input id="school_name" name="school_name" type="text" required value="{{ form_data.school_name }}">
                    </div>
                    <div class="booking-review__field">
                        <label for="school_number">Dienststellennummer *</label>
                        <input id="school_number" name="school_number" type="text" required placeholder="Zur Legitimation" value="{{ form_data.school_number }}">
                    </div>
                    <div class="booking-review__field">
                        <label for="contact_person">Ansprechpartner *</label>
                        <input id="contact_person" name="contact_person" type="text" required value="{{ form_data.contact_person }}">
                    </div>
                    <div class="booking-review__field">
                        <label for="contact_email">Dienstliche E-Mail *</label>
                        <input id="contact_email" name="contact_email" type="email" required value="{{ form_data.contact_email }}">
                    </div>

                    <!-- OPTIMIERT: Rechnungsdaten inkl. Kassenzeichen -->
                    <div class="booking-review__section-title">2. Rechnungsadresse (Schulträger)</div>
                    <div class="booking-review__field booking-review__field--full">
                        <label for="billing_organization">Einrichtung / Amt *</label>
                        <input id="billing_organization" name="billing_organization" type="text" required placeholder="z.B. Stadt Neustadt - Schulverwaltungsamt" value="{{ form_data.billing_organization }}">
                    </div>
                    <div class="booking-review__field booking-review__field--full">
                        <label for="billing_street">Straße & Hausnummer *</label>
                        <input id="billing_street" name="billing_street" type="text" required value="{{ form_data.billing_street }}">
                    </div>
                    <div class="booking-review__field">
                        <label for="billing_zip">PLZ *</label>
                        <input id="billing_zip" name="billing_zip" type="text" required value="{{ form_data.billing_zip }}">
                    </div>
                    <div class="booking-review__field">
                        <label for="billing_city">Ort *</label>
                        <input id="billing_city" name="billing_city" type="text" required value="{{ form_data.billing_city }}">
                    </div>
                    <div class="booking-review__field booking-review__field--full">
                        <label for="billing_reference">Kassenzeichen / Haushaltsstelle / Aktenzeichen <span style="font-weight: normal; color: #5e757d;">(Optional)</span></label>
                        <input id="billing_reference" name="billing_reference" type="text" placeholder="Wichtig für die Zahlungsabwicklung der Stadt" value="{{ form_data.billing_reference }}">
                    </div>

                    <div class="booking-review__section-title">3. Technische Einrichtung</div>
                    <div class="booking-review__field booking-review__field--full">
                        <label for="tenant_slug">Gewünschte Schul-URL *</label>
                        <div class="input-group--subdomain">
                            <input id="tenant_slug" name="tenant_slug" type="text" required pattern="[a-z0-9-]+" title="Nur Kleinbuchstaben, Zahlen und Bindestriche erlaubt" placeholder="gymnasium-neustadt" value="{{ form_data.tenant_slug }}">
                            <span class="domain-suffix">.invario-software.de</span>
                        </div>
                        <div id="tenant_slug_feedback" style="margin-top:0.4rem; font-size:0.9rem; font-weight:600;"></div>
                    </div>

                    <div class="booking-review__field booking-review__field--full booking-review__consent">
                        <label for="agreements_accepted">
                            <input id="agreements_accepted" name="agreements_accepted" type="checkbox" required>
                            <span>
                                Ich habe die <a href="{{ url_for('nutzungsbedingungen') }}" target="_blank" rel="noopener" style="color: #1a68d0; font-weight: 700;">AGB (PDF)</a>, 
                                die <a href="{{ url_for('vertrag') }}" target="_blank" rel="noopener" style="color: #1a68d0; font-weight: 700;">Vertragsbedingungen</a> sowie den gesetzlich erforderlichen 
                                <a href="{{ url_for('avv') }}" target="_blank" rel="noopener" style="color: #1a68d0; font-weight: 700;">Auftragsverarbeitungsvertrag (AVV)</a> gelesen und stimme diesen Dokumenten verbindlich zu.
                            </span>
                        </label>
                    </div>
                </div>

                <!-- Fehleranzeige, falls der Server beim Submit meckert -->
                <div id="form-error-alert" style="display:none; color:#b02a37; margin-top:1rem; font-weight:bold;"></div>

                <div class="booking-review__actions">
                    <button id="booking_submit" class="btn" type="submit">Kostenpflichtig buchen & Instanz starten</button>
                </div>
            </form>
        </div>

        <!-- ========================================== -->
        <!-- STATE 2: LOADING (Asynchrones Setup)       -->
        <!-- ========================================== -->
        <div id="setup-loading-state">
            <h2>Instanz wird bereitgestellt</h2>
            <p>Ihre Bestellung wird verarbeitet. Die Rechnung wird zeitgleich generiert.</p>
            <div class="spinner"></div>
            <div class="status-messages" id="loading-status-text">Validierung der Daten...</div>
            <p style="margin-top: 2rem; color: #5e757d; font-size: 0.9rem;">Bitte schließen Sie dieses Fenster nicht. Dies dauert in der Regel 15-30 Sekunden.</p>
        </div>

        <!-- ========================================== -->
        <!-- STATE 3: SUCCESS (Bereit zur Nutzung)      -->
        <!-- ========================================== -->
        <div id="setup-success-state">
            <div class="success-icon">✓</div>
            <h2>Ihre Schule ist online!</h2>
            <p>Das Setup wurde erfolgreich abgeschlossen. Ihre Rechnung wurde an die angegebene E-Mail-Adresse versandt.</p>
            
            <div class="warning-text">
                Aus Datenschutzgründen (AVV) müssen Sie das generierte Passwort nach dem ersten Login zwingend ändern!
            </div>

            <div class="credentials-box">
                <p><strong>Login-URL:</strong> <br><a id="success-url" href="#" target="_blank" style="color: #66d9e8;">-</a></p>
                <p><strong>Benutzername (Admin):</strong> <code id="success-user">-</code></p>
                <p><strong>Initial-Passwort:</strong> <code id="success-pass">-</code></p>
            </div>

            <!-- OPTIMIERT: Rechnungs-Download, Weiterleitung und Drucken -->
            <div class="booking-review__actions" style="justify-content: center; margin-top: 2rem;">
                <a id="btn-download-invoice" href="#" class="btn success-btn" target="_blank" style="display: none;">
                    📄 Rechnung (PDF) herunterladen
                </a>
                <a id="btn-go-to-tenant" href="#" class="btn" target="_blank">Zur Schulplattform wechseln</a>
                <button onclick="window.print();" class="btn secondary" type="button">
                    🖨️ Zugangsdaten drucken
                </button>
            </div>
        </div>

    </div>
</section>

<script>
(() => {
    // DOM Elemente
    const formState = document.getElementById('checkout-form-state');
    const loadingState = document.getElementById('setup-loading-state');
    const successState = document.getElementById('setup-success-state');
    
    const form = document.getElementById('checkout-form');
    const errorAlert = document.getElementById('form-error-alert');
    const statusText = document.getElementById('loading-status-text');
    const spinner = document.querySelector('.spinner'); // Referenz auf den Ladekreis
    
    // Subdomain Live-Prüfung
    const slugInput = document.getElementById('tenant_slug');
    const feedback = document.getElementById('tenant_slug_feedback');
    const submitBtn = document.getElementById('booking_submit');
    let slugTimer = null;

    // OPTIMIERT: Alles im 'input'-Event (fängt auch Maus-Paste und Autocomplete)
    slugInput.addEventListener('input', (e) => {
        // 1. Sanitization
        e.target.value = e.target.value.toLowerCase().replace(/[^a-z0-9-]/g, '');
        
        // 2. Debounced API Check
        clearTimeout(slugTimer);
        slugTimer = setTimeout(() => checkSubdomain(e.target.value), 600);
    });

    async function checkSubdomain(name) {
        if (name.length < 3) {
            feedback.textContent = 'Bitte mindestens 3 Zeichen eingeben.';
            feedback.style.color = '#5e757d';
            submitBtn.disabled = true;
            return;
        }
        try {
            const res = await fetch(`/instance_request/check_subdomain?slug=${name}`);
            const j = await res.json();
            if (j.available) {
                feedback.textContent = 'Adresse ist frei!';
                feedback.style.color = '#1b8a3e';
                submitBtn.disabled = false;
            } else {
                feedback.textContent = 'Adresse ist bereits vergeben.';
                feedback.style.color = '#b02a37';
                submitBtn.disabled = true;
            }
        } catch (e) {
            console.error(e);
            feedback.textContent = 'Prüfung fehlgeschlagen. Bitte erneut versuchen.';
            feedback.style.color = '#b02a37';
        }
    }

    // ==========================================
    // AJAX Form Submit & Transition to Loading
    // ==========================================
    form.addEventListener('submit', async (e) => {
        e.preventDefault(); 
        errorAlert.style.display = 'none';
        
        // OPTIMIERT: Visuelles Feedback für den initialen Submit
        const originalBtnText = submitBtn.textContent;
        submitBtn.disabled = true;
        submitBtn.textContent = "Wird verarbeitet...";

        const formData = new FormData(form);
        const tenantSlug = formData.get('tenant_slug');

        try {
            const response = await fetch(form.action, {
                method: 'POST',
                body: formData,
                headers: { 'Accept': 'application/json' }
            });

            const result = await response.json();

            if (!response.ok) {
                throw new Error(result.error || 'Es gab ein Problem bei der Buchung.');
            }

            // Erfolg: Formular verstecken, Ladebildschirm zeigen
            formState.style.display = 'none';
            loadingState.style.display = 'block';

            // Starte Polling
            startPolling(tenantSlug);

        } catch (error) {
            errorAlert.textContent = error.message;
            errorAlert.style.display = 'block';
            submitBtn.disabled = false;
            submitBtn.textContent = originalBtnText; // Button zurücksetzen
        }
    });

    // ==========================================
    // Polling Logik (Warten auf den Server)
    // ==========================================
    async function startPolling(slug) {
        const statusMessages = [
            "Registriere Schuldatenbank...",
            "Erstelle Auftragsverarbeitungsvertrag...",
            "Generiere Rechnung für Schulträger...",
            "Konfiguriere Nginx & Zertifikate...",
            "Führe finale Health-Checks durch..."
        ];
        
        let msgIndex = 0;
        const msgInterval = setInterval(() => {
            if (msgIndex < statusMessages.length) {
                statusText.textContent = statusMessages[msgIndex];
                msgIndex++;
            }
        }, 3500);

        let retryCount = 0;
        const maxRetries = 30; // OPTIMIERT: Max 90 Sekunden Polling (30 * 3s)

        const checkStatus = async () => {
            retryCount++;
            
            // Timeout-Abbruch
            if (retryCount > maxRetries) {
                handlePollingError("Zeitüberschreitung. Die Bereitstellung dauert ungewöhnlich lange. Sie werden per E-Mail informiert, sobald das System bereit ist.", msgInterval);
                return;
            }

            try {
                const res = await fetch(`/instance_request/status?slug=${slug}`);
                if (!res.ok) throw new Error("Network response was not ok");
                
                const data = await res.json();

                if (data.status === 'ready') {
                    // SETUP FERTIG!
                    clearInterval(msgInterval);
                    showSuccessState(data.url, data.username, data.password, data.invoice_url);
                } else if (data.status === 'failed') {
                    // SETUP FEHLGESCHLAGEN
                    handlePollingError("Fehler bei der Bereitstellung. Bitte kontaktieren Sie unseren Support.", msgInterval);
                } else {
                    // SETUP LÄUFT NOCH -> in 3 Sekunden erneut prüfen
                    setTimeout(checkStatus, 3000);
                }
            } catch (err) {
                // Bei Netzwerkfehler weiter versuchen, solange maxRetries nicht erreicht ist
                setTimeout(checkStatus, 3000);
            }
        };

        // Starte den ersten Check nach 2 Sekunden
        setTimeout(checkStatus, 2000);
    }
    
    // OPTIMIERT: Hilfsfunktion für Polling-Fehler (verhindert Sackgassen-UI)
    function handlePollingError(message, intervalId) {
        clearInterval(intervalId);
        statusText.textContent = message;
        statusText.style.color = '#b02a37';
        if (spinner) spinner.style.display = 'none'; // Spinner ausblenden
        
        // Optional: Einen Zurück/Support-Button einfügen
        statusText.insertAdjacentHTML('afterend', '<br><a href="#" onclick="window.location.reload(); return false;" class="btn secondary" style="margin-top:1rem;">Seite neu laden</a>');
    }

    // ==========================================
    // Erfolgs-Bildschirm anzeigen
    // ==========================================
    function showSuccessState(url, user, pass, invoiceUrl) {
        loadingState.style.display = 'none';
        successState.style.display = 'block';

        document.getElementById('success-url').textContent = url;
        document.getElementById('success-url').href = url;
        document.getElementById('success-user').textContent = user;
        document.getElementById('success-pass').textContent = pass;
        document.getElementById('btn-go-to-tenant').href = url;

        // Rechnungs-Button einblenden, falls URL vorhanden
        const invoiceBtn = document.getElementById('btn-download-invoice');
        if (invoiceUrl) {
            invoiceBtn.href = invoiceUrl;
            invoiceBtn.style.display = 'inline-flex';
        }
    }
})();
</script>
{% endblock %}