{% extends "base.html" %}
{% block title %}{{ profile_user.username }} {{ 'showcase.title'|t(lang) }}{% endblock %}
{% block nav %}{% endblock %}
{% block content %}
<div class="showcase-lang-bar">
    <div class="lang-switcher" id="langSwitcher">
        <button type="button" class="lang-globe" onclick="document.getElementById('langDropdown').classList.toggle('show')">🌐</button>
        <div class="lang-dropdown" id="langDropdown">
            {% for code, name in available_languages.items() %}
            <a href="?lang={{ code }}" class="lang-option {% if lang == code %}active{% endif %}">{{ name }}</a>
            {% endfor %}
        </div>
    </div>
</div>
<div class="section-header">
    <h1>📮 {{ profile_user.username }} {{ 'showcase.title'|t(lang) }}</h1>
</div>

{% set sent_visible = [] %}
{% set received_visible = [] %}
{% for pc in sent_all %}
    {% if pc.image_front %}
        {% if sent_visible.append(pc) %}{% endif %}
    {% endif %}
{% endfor %}
{% for pc in received_all %}
    {% if pc.image_front %}
        {% if received_visible.append(pc) %}{% endif %}
    {% endif %}
{% endfor %}

{% set has_content = (sent_visible|length + received_visible|length) > 0 %}
{% if not has_content %}
<div class="empty-state">
    <p>{{ 'showcase.empty'|t(lang) }}</p>
</div>
{% else %}

<div class="tabs" id="tabs">
    <button class="tab active" onclick="switchTab('sent')">{{ 'showcase.tab_sent'|t(lang) }} ({{ sent_visible|length }})</button>
    <button class="tab" onclick="switchTab('received')">{{ 'showcase.tab_received'|t(lang) }} ({{ received_visible|length }})</button>
</div>

<div id="tab-sent" class="tab-panel">
{% if mode == 'flat' %}
    <div class="showcase-grid" id="grid-sent">
    {% for pc in sent_visible %}
        <div class="showcase-card" data-front="{{ pc.image_front }}" onclick="openLightbox(this)">
            <img src="{{ pc.image_front }}" alt="" class="showcase-card-img" loading="lazy">
            <div class="showcase-card-body">
                <div class="showcase-card-meta">
                    {% if pc.country_from and pc.country %}<span>{{ pc.country_from|flag }}→{{ pc.country|flag }}</span>
                    {% elif pc.country %}<span>{{ pc.country|flag }}</span>
                    {% endif %}
                </div>
            </div>
        </div>
    {% endfor %}
    </div>
{% else %}
    {% for g in profile_groups %}
    {% set g_sent = [] %}
    {% for pc in g.sent %}
        {% if pc.image_front %}
            {% if g_sent.append(pc) %}{% endif %}
        {% endif %}
    {% endfor %}
    {% if g_sent %}
    <h3 style="margin:1rem 0 .75rem;font-size:.95rem;color:var(--text-muted)">{{ g.profile.nickname }}</h3>
    <div class="showcase-grid">
        {% for pc in g_sent %}
        <div class="showcase-card" data-front="{{ pc.image_front }}" onclick="openLightbox(this)">
            <img src="{{ pc.image_front }}" alt="" class="showcase-card-img" loading="lazy">
            <div class="showcase-card-body">
                <div class="showcase-card-meta">
                    {% if pc.country_from and pc.country %}<span>{{ pc.country_from|flag }}→{{ pc.country|flag }}</span>
                    {% elif pc.country %}<span>{{ pc.country|flag }}</span>
                    {% endif %}
                </div>
            </div>
        </div>
        {% endfor %}
    </div>
    {% endif %}
    {% endfor %}
{% endif %}
<div id="scroll-sentinel-sent" style="height:1px"></div>
<div id="scroll-loading-sent" style="text-align:center;padding:1rem;color:var(--text-muted);display:none">⏳</div>
</div>

<div id="tab-received" class="tab-panel" style="display:none">
{% if mode == 'flat' %}
    <div class="showcase-grid" id="grid-received">
    {% for pc in received_visible %}
        <div class="showcase-card" data-front="{{ pc.image_front }}" onclick="openLightbox(this)">
            <img src="{{ pc.image_front }}" alt="" class="showcase-card-img" loading="lazy">
            <div class="showcase-card-body">
                <div class="showcase-card-meta">
                    {% if pc.country_from and pc.country %}<span>{{ pc.country_from|flag }}→{{ pc.country|flag }}</span>
                    {% elif pc.country %}<span>{{ pc.country|flag }}</span>
                    {% endif %}
                </div>
            </div>
        </div>
    {% endfor %}
    </div>
{% else %}
    {% for g in profile_groups %}
    {% set g_received = [] %}
    {% for pc in g.received %}
        {% if pc.image_front %}
            {% if g_received.append(pc) %}{% endif %}
        {% endif %}
    {% endfor %}
    {% if g_received %}
    <h3 style="margin:1rem 0 .75rem;font-size:.95rem;color:var(--text-muted)">{{ g.profile.nickname }}</h3>
    <div class="showcase-grid">
        {% for pc in g_received %}
        <div class="showcase-card" data-front="{{ pc.image_front }}" onclick="openLightbox(this)">
            <img src="{{ pc.image_front }}" alt="" class="showcase-card-img" loading="lazy">
            <div class="showcase-card-body">
                <div class="showcase-card-meta">
                    {% if pc.country_from and pc.country %}<span>{{ pc.country_from|flag }}→{{ pc.country|flag }}</span>
                    {% elif pc.country %}<span>{{ pc.country|flag }}</span>
                    {% endif %}
                </div>
            </div>
        </div>
        {% endfor %}
    </div>
    {% endif %}
    {% endfor %}
{% endif %}
<div id="scroll-sentinel-received" style="height:1px"></div>
<div id="scroll-loading-received" style="text-align:center;padding:1rem;color:var(--text-muted);display:none">⏳</div>
</div>
{% endif %}

<div id="lightbox" class="lightbox" onclick="closeLightbox(event)">
    <div class="lightbox-content" onclick="event.stopPropagation()">
        <button class="lightbox-close" onclick="closeLightbox(event)">&times;</button>
        <button class="lightbox-prev" onclick="navLightbox(-1,event)">&#8249;</button>
        <button class="lightbox-next" onclick="navLightbox(1,event)">&#8250;</button>
        <img id="lightbox-img" src="" alt="">
        <div id="lightbox-caption" class="lightbox-caption"></div>
    </div>
</div>

<script>
var _username = '{{ profile_user.username }}';
var _sentPage = 1, _sentMore = {{ 'true' if sent_visible|length > 19 else 'false' }};
var _recvPage = 1, _recvMore = {{ 'true' if received_visible|length > 19 else 'false' }};
var _sentLoading = false, _recvLoading = false;

function _flag(code) {
    if (!code || code.length !== 2) return code || '';
    return String.fromCodePoint(0x1F1E6 + code.charCodeAt(0) - 65) + String.fromCodePoint(0x1F1E6 + code.charCodeAt(1) - 65);
}

function _appendCard(c, gridId) {
    var grid = document.getElementById(gridId);
    if (!grid) return;
    var div = document.createElement('div');
    div.className = 'showcase-card';
    div.setAttribute('data-front', c.image_front);
    div.onclick = function() { openLightbox(div); };
    var countryHtml = '';
    if (c.country_from && c.country) countryHtml = '<span>' + _flag(c.country_from) + '→' + _flag(c.country) + '</span>';
    else if (c.country) countryHtml = '<span>' + _flag(c.country) + '</span>';
    div.innerHTML = '<img src="' + c.image_front + '" alt="" class="showcase-card-img" loading="lazy">' +
        '<div class="showcase-card-body"><div class="showcase-card-meta">' + countryHtml + '</div></div>';
    grid.appendChild(div);
}

function _loadMoreSent() {
    if (_sentLoading || !_sentMore) return;
    _sentLoading = true;
    document.getElementById('scroll-loading-sent').style.display = '';
    fetch('/api/public/cards/' + _username + '?page=' + (_sentPage + 1) + '&limit=20&tab=sent')
        .then(function(r) { return r.json(); })
        .then(function(data) {
            _sentLoading = false;
            document.getElementById('scroll-loading-sent').style.display = 'none';
            _sentPage = data.page;
            _sentMore = data.has_more;
            data.cards.forEach(function(c) { _appendCard(c, 'grid-sent'); });
            if (!_sentMore) { var s = document.getElementById('scroll-sentinel-sent'); if (s) s.remove(); }
        })
        .catch(function() { _sentLoading = false; });
}

function _loadMoreReceived() {
    if (_recvLoading || !_recvMore) return;
    _recvLoading = true;
    document.getElementById('scroll-loading-received').style.display = '';
    fetch('/api/public/cards/' + _username + '?page=' + (_recvPage + 1) + '&limit=20&tab=received')
        .then(function(r) { return r.json(); })
        .then(function(data) {
            _recvLoading = false;
            document.getElementById('scroll-loading-received').style.display = 'none';
            _recvPage = data.page;
            _recvMore = data.has_more;
            data.cards.forEach(function(c) { _appendCard(c, 'grid-received'); });
            if (!_recvMore) { var s = document.getElementById('scroll-sentinel-received'); if (s) s.remove(); }
        })
        .catch(function() { _recvLoading = false; });
}

var _obsSent = new IntersectionObserver(function(e) { if (e[0].isIntersecting) _loadMoreSent(); }, {rootMargin: '400px'});
var _obsRecv = new IntersectionObserver(function(e) { if (e[0].isIntersecting) _loadMoreReceived(); }, {rootMargin: '400px'});
var _sSent = document.getElementById('scroll-sentinel-sent');
var _sRecv = document.getElementById('scroll-sentinel-received');
if (_sSent) _obsSent.observe(_sSent);
if (_sRecv) _obsRecv.observe(_sRecv);

function switchTab(name) {
    document.querySelectorAll('.tab').forEach(function(t) { t.classList.remove('active'); });
    document.querySelectorAll('.tab-panel').forEach(function(p) { p.style.display = 'none'; });
    event.currentTarget.classList.add('active');
    document.getElementById('tab-' + name).style.display = '';
}

var lightboxItems = [];
var lightboxIdx = 0;

function buildLightboxItems() {
    lightboxItems = [];
    var visible = document.querySelectorAll('.tab-panel:not([style*="display:none"]) .showcase-card[data-front]');
    visible.forEach(function(card) {
        var front = card.getAttribute('data-front');
        if (front) lightboxItems.push({src: front});
    });
}

function openLightbox(el) {
    buildLightboxItems();
    var front = el.getAttribute('data-front');
    if (!front) return;
    for (var i = 0; i < lightboxItems.length; i++) {
        if (lightboxItems[i].src === front) { lightboxIdx = i; break; }
    }
    showLightboxItem();
    document.getElementById('lightbox').classList.add('active');
    document.body.style.overflow = 'hidden';
}

function showLightboxItem() {
    if (!lightboxItems.length) return;
    var item = lightboxItems[lightboxIdx];
    document.getElementById('lightbox-img').src = item.src;
    document.getElementById('lightbox-caption').textContent = (lightboxIdx+1) + '/' + lightboxItems.length;
}

function closeLightbox(e) {
    if (e) e.stopPropagation();
    document.getElementById('lightbox').classList.remove('active');
    document.body.style.overflow = '';
}

function navLightbox(dir, e) {
    if (e) e.stopPropagation();
    if (!lightboxItems.length) return;
    lightboxIdx = (lightboxIdx + dir + lightboxItems.length) % lightboxItems.length;
    showLightboxItem();
}

document.addEventListener('keydown', function(e) {
    var lb = document.getElementById('lightbox');
    if (!lb || !lb.classList.contains('active')) return;
    if (e.key === 'Escape') closeLightbox();
    else if (e.key === 'ArrowLeft') navLightbox(-1);
    else if (e.key === 'ArrowRight') navLightbox(1);
});
document.addEventListener('click', function(e) {
    var sw = document.getElementById('langSwitcher');
    var dd = document.getElementById('langDropdown');
    if (sw && dd && !sw.contains(e.target)) dd.classList.remove('show');
});
</script>
{% endblock %}