{% extends "base.html" %}

{% block title_extra %} — {{ _('invite_public_title') }}{% endblock %}

{% block content %}
<div class="card" style="max-width: 560px; margin: 2rem auto;">
    <div class="card-header"
        style="justify-content: center; text-align: center; flex-direction: column; gap: var(--space-xs);">
        <h2 class="card-title">{{ invite.name }}</h2>
        <p style="color: var(--text-muted); font-size: 0.9rem;">{{ _('invite_public_subtitle') }}</p>
    </div>

    {% if need_password %}
    <div style="padding: var(--space-lg); text-align: center;">
        <div class="logo-icon" style="font-size: 3rem; margin-bottom: var(--space-md);">🔐</div>
        <p style="margin-bottom: var(--space-md);">{{ _('invite_protected_desc') }}</p>
        <form id="authForm" onsubmit="authInvite(event)"
            style="display: flex; flex-direction: column; gap: var(--space-md); max-width: 300px; margin: 0 auto;">
            <div class="form-group">
                <input type="password" id="invitePassword" class="form-input" placeholder="{{ _('password') }}" required autofocus>
            </div>
            <button type="submit" class="btn btn-primary" id="authBtn">
                <span id="authBtnText">{{ _('login') }}</span>
                <div class="spinner hidden" id="authSpinner"></div>
            </button>
        </form>
    </div>
    {% else %}
    <div style="padding: var(--space-lg); text-align: center;">
        <div id="statusBox" style="margin-bottom: var(--space-md); color: var(--text-muted); font-size: 0.95rem;">
            {% if invite.unlimited %}
            {{ _('invite_uses_left_unlimited').replace('{}', invite.used_count|string) }}
            {% elif invite.remaining is not none %}
            {{ _('invite_uses_left').replace('{}', invite.remaining|string) }}
            {% endif %}
        </div>

        {% if invite.available %}
        <button class="btn btn-primary" style="width:100%; max-width:320px;" onclick="createInviteConfig()" id="createBtn">
            <span id="createBtnText">{{ _('guest_get_config') }}</span>
            <div class="spinner hidden" id="createSpinner" style="width:14px;height:14px;"></div>
        </button>
        <div class="form-hint" style="margin-top: var(--space-sm);">{{ _('invite_get_config_hint') }}</div>
        {% elif invite.expired %}
        <p style="color:#ef4444;">{{ _('invite_expired') }}</p>
        {% elif invite.exhausted %}
        <p style="color:#ef4444;">{{ _('invite_exhausted') }}</p>
        {% else %}
        <p style="color:#ef4444;">{{ _('disabled') }}</p>
        {% endif %}
    </div>
    {% endif %}
</div>

<div class="modal-backdrop" id="configModal">
    <div class="modal" style="max-width: 600px;">
        <div class="modal-header">
            <h2 class="modal-title" id="configModalTitle">{{ _('config') }}</h2>
            <button class="modal-close" onclick="closeModal('configModal')">×</button>
        </div>
        <div class="config-tabs">
            <button class="config-tab active" onclick="switchConfigTab('conf')">{{ _('config_tab') }}</button>
            <button class="config-tab" onclick="switchConfigTab('vpn')">{{ _('vpn_key_tab') }}</button>
            <button class="config-tab" onclick="switchConfigTab('qr')">{{ _('qr_code_tab') }}</button>
        </div>
        <div class="config-panel active" id="panel-conf">
            <div class="config-display">
                <textarea class="config-text" id="configText" readonly rows="12"
                    style="width:100%; border:none; background:transparent; color:inherit; font-family:monospace; resize:none; outline:none;"></textarea>
                <div class="config-actions">
                    <button class="btn btn-secondary btn-sm" onclick="copyConfig()" style="flex:1">{{ _('copy_config') }}</button>
                    <a id="downloadBtn" class="btn btn-primary btn-sm"
                        style="flex:1; text-decoration:none; display:flex; align-items:center; justify-content:center;">
                        {{ _('download_conf') }}
                    </a>
                </div>
            </div>
        </div>
        <div class="config-panel" id="panel-vpn">
            <div class="vpn-link-box" id="vpnLinkText" style="min-height: 100px;"></div>
            <div class="config-actions" style="margin-top:var(--space-sm);">
                <button class="btn btn-secondary btn-sm" onclick="copyVpnLink()" style="flex:1">{{ _('copy_key') }}</button>
            </div>
        </div>
        <div class="config-panel" id="panel-qr">
            <div class="qr-container"><div id="qrcode"></div></div>
        </div>
    </div>
</div>

<script>
    const TOKEN = "{{ token }}";
    let currentConfig = '';
    let currentVpnLink = '';

    async function authInvite(e) {
        e.preventDefault();
        const password = document.getElementById('invitePassword').value;
        const btn = document.getElementById('authBtn');
        const text = document.getElementById('authBtnText');
        const spinner = document.getElementById('authSpinner');
        btn.disabled = true;
        text.classList.add('hidden');
        spinner.classList.remove('hidden');
        try {
            const res = await fetch(`/api/invite/${TOKEN}/auth`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ password })
            });
            const data = await res.json();
            if (data.status === 'success') window.location.reload();
            else alert(data.error || _('login_error'));
        } catch (err) {
            alert(`${_('error')}: ` + err.message);
        } finally {
            btn.disabled = false;
            text.classList.remove('hidden');
            spinner.classList.add('hidden');
        }
    }

    function switchConfigTab(tab) {
        document.querySelectorAll('.config-tab').forEach(t => t.classList.remove('active'));
        document.querySelectorAll('.config-panel').forEach(p => p.classList.remove('active'));
        const tabs = document.querySelectorAll('.config-tab');
        const panels = { conf: 'panel-conf', vpn: 'panel-vpn', qr: 'panel-qr' };
        const tabIdx = { conf: 0, vpn: 1, qr: 2 };
        tabs[tabIdx[tab]].classList.add('active');
        document.getElementById(panels[tab]).classList.add('active');
    }

    function openConfigModal(name, config, vpnLink) {
        currentConfig = config;
        currentVpnLink = vpnLink || '';
        document.getElementById('configText').value = config;
        document.getElementById('vpnLinkText').textContent = currentVpnLink;
        document.getElementById('configModalTitle').textContent = name;
        document.getElementById('downloadBtn').onclick = () => downloadFile(config, `${name}.conf`);
        const qrContainer = document.getElementById('qrcode');
        qrContainer.innerHTML = '';
        new QRCode(qrContainer, {
            text: config, width: 256, height: 256,
            colorDark: '#000000', colorLight: '#ffffff',
            correctLevel: QRCode.CorrectLevel.L
        });
        switchConfigTab('conf');
        openModal('configModal');
    }

    function copyConfig() { copyToClipboard(currentConfig); }
    function copyVpnLink() { copyToClipboard(currentVpnLink); }

    function updateStatus(invite) {
        const box = document.getElementById('statusBox');
        if (!box || !invite) return;
        if (invite.unlimited) {
            box.textContent = _('invite_uses_left_unlimited').replace('{}', String(invite.used_count || 0));
        } else if (invite.remaining != null) {
            box.textContent = _('invite_uses_left').replace('{}', String(invite.remaining));
        }
        if (!invite.available) {
            const btn = document.getElementById('createBtn');
            if (btn) btn.style.display = 'none';
        }
    }

    async function createInviteConfig() {
        const btn = document.getElementById('createBtn');
        const text = document.getElementById('createBtnText');
        const spinner = document.getElementById('createSpinner');
        btn.disabled = true;
        text.classList.add('hidden');
        spinner.classList.remove('hidden');
        try {
            const res = await fetch(`/api/invite/${TOKEN}/create`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ name: 'Invite VPN' })
            });
            const data = await res.json();
            if (!res.ok || data.error) throw new Error(data.error || _('error'));
            if (data.config) openConfigModal(data.connection?.name || 'VPN', data.config, data.vpn_link || '');
            updateStatus(data.invite);
        } catch (err) {
            alert(`${_('error')}: ` + err.message);
        } finally {
            btn.disabled = false;
            text.classList.remove('hidden');
            spinner.classList.add('hidden');
        }
    }
</script>

<style>
    .spinner {
        border: 3px solid rgba(255, 255, 255, 0.1);
        border-top: 3px solid var(--accent-color);
        border-radius: 50%;
        width: 20px;
        height: 20px;
        animation: spin 1s linear infinite;
        display: inline-block;
    }
    @keyframes spin { to { transform: rotate(360deg); } }
</style>
{% endblock %}