// ── Image gallery ──

import { $, esc, api, getCsrf } from './util.js';

const AUDIO_EXT = /\.(mp3|ogg|wav|m4a)$/i;
function isAudio(url) { return AUDIO_EXT.test(url); }

function mediaTile(url, extraClass = '') {
    if (isAudio(url)) {
        return `<div class="aspect-square bg-t-bg border ${extraClass} rounded overflow-hidden flex flex-col items-center justify-center gap-2 p-2">
            <i class="ph ph-music-note text-2xl text-t-dim"></i>
            <audio controls preload="metadata" src="${url}" class="w-full" style="height:28px"></audio>
        </div>`;
    }
    return `<div class="aspect-square bg-t-bg border ${extraClass} rounded overflow-hidden">
        <img src="${url}" class="w-full h-full object-cover${extraClass.includes('danger') ? ' opacity-60' : ''}" loading="lazy">
    </div>`;
}
import { state } from './state.js';
import { showDialog } from './dialog.js';

function getReferencedUrls() {
    const urls = new Set();
    for (const card of state.cards) {
        const body = card.body || '';
        let m;
        const mdRe = /!\[[^\]]*\]\(([^)]+)\)/g;
        while ((m = mdRe.exec(body)) !== null) urls.add(m[1].split(/\s/)[0]);
        const htmlRe = /<img[^>]+src=["']([^"']+)["'][^>]*>/gi;
        while ((m = htmlRe.exec(body)) !== null) urls.add(m[1]);
    }
    return urls;
}

function findCardForUrl(url) {
    for (const card of state.cards) {
        const body = card.body || '';
        if (body.includes(url)) return card;
    }
    return null;
}

export async function openGallery() {
    const el = $('gallery');
    if (!el) return;

    const files = await api('api/uploads');
    const referenced = getReferencedUrls();
    const grid = $('gallery-grid');
    const count = $('gallery-count');

    const linked = [];
    const orphaned = [];
    for (const f of files) {
        const card = findCardForUrl(f.url);
        if (card) {
            linked.push({ ...f, cardId: card.id, cardTitle: card.title, cardColor: card.color });
        } else {
            orphaned.push(f);
        }
    }

    const total = linked.length + orphaned.length;
    if (count) count.textContent = `${total} image${total !== 1 ? 's' : ''}${orphaned.length ? ` · ${orphaned.length} orphaned` : ''}`;

    if (!total) {
        grid.innerHTML = `<div class="col-span-full text-center py-16">
            <i class="ph ph-image text-4xl text-t-dim mb-2 block"></i>
            <p class="font-pixel text-[10px] text-t-dim">no images</p></div>`;
    } else {
        let html = '';

        if (orphaned.length) {
            html += `<div class="col-span-full font-pixel text-[10px] text-t-danger flex items-center gap-1.5 pt-2"><i class="ph ph-warning text-xs"></i>orphaned (not used by any card)</div>`;
            html += orphaned.map(f => `
                <div class="gallery-item group relative cursor-pointer" data-orphan="${f.name}">
                    ${mediaTile(f.url, 'border-t-danger/30')}
                    <div class="mt-1 font-pixel text-[8px] text-t-dim truncate">${esc(f.name)}</div>
                </div>`).join('');
        }

        if (linked.length) {
            if (orphaned.length) html += `<div class="col-span-full font-pixel text-[10px] text-t-muted flex items-center gap-1.5 pt-3"><i class="ph ph-link text-xs"></i>linked to cards</div>`;
            html += linked.map(img => `
                <div class="gallery-item group relative cursor-pointer" data-card-id="${img.cardId}" data-gallery-origin="${encodeURIComponent(img.url)}">
                    ${mediaTile(img.url, 'border-t-border')}
                    <div class="absolute inset-0 bg-black/60 opacity-0 group-hover:opacity-100 transition-opacity rounded flex flex-col justify-end p-2">
                        <div class="flex items-center gap-1.5">
                            <span class="w-2 h-2 rounded-full shrink-0" style="background:${img.cardColor}"></span>
                            <span class="font-pixel text-[9px] text-white truncate">${esc(img.cardTitle)}</span>
                        </div>
                    </div>
                </div>`).join('');
        }

        grid.innerHTML = html;

        // Linked image clicks → open card
        grid.querySelectorAll('[data-card-id]').forEach(item => {
            item.addEventListener('click', () => {
                window._openDetail(item.dataset.cardId, {
                    fromGallery: true,
                    galleryOrigin: item.dataset.galleryOrigin || null,
                });
            });
        });

        // Orphan: click to enlarge
        grid.querySelectorAll('[data-orphan]').forEach(item => {
            item.addEventListener('click', e => {
                if (e.target.closest('button')) return;
                const name = item.dataset.orphan;
                const f = orphaned.find(o => o.name === name);
                if (f && !isAudio(f.url)) openOrphanLightbox(f);
            });
        });
    }

    el.classList.add('open');
}

function openOrphanLightbox(file) {
    let overlay = document.querySelector('.orphan-lightbox');
    if (overlay) overlay.remove();

    overlay = document.createElement('div');
    overlay.className = 'orphan-lightbox';
    overlay.style.cssText = 'position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;background:rgba(2,6,23,0.92);';
    overlay.innerHTML = `
        <img src="${file.url}" style="max-width:min(92vw,1400px);max-height:85vh;object-fit:contain;border:1px solid var(--t-border);box-shadow:0 16px 60px rgba(0,0,0,0.55);">
        <div style="position:fixed;bottom:24px;left:50%;transform:translateX(-50%);display:flex;gap:8px;">
            <button class="orphan-lb-create flex items-center gap-1.5 px-3 py-1.5 text-xs border border-t-accent text-t-accent hover:bg-t-accent hover:text-t-bg transition-colors" style="border-radius:4px;">
                <i class="ph ph-plus text-sm"></i><span class="font-pixel text-[10px]">new card</span>
            </button>
            <button class="orphan-lb-delete flex items-center gap-1.5 px-3 py-1.5 text-xs border border-t-danger text-t-danger hover:bg-t-danger hover:text-t-bg transition-colors" style="border-radius:4px;">
                <i class="ph ph-trash text-sm"></i><span class="font-pixel text-[10px]">delete</span>
            </button>
        </div>
        <button style="position:fixed;top:12px;right:12px;color:rgba(255,255,255,0.6);font-size:20px;background:none;border:none;cursor:pointer;" class="orphan-lb-close">
            <i class="ph ph-x"></i>
        </button>
    `;

    const close = () => overlay.remove();
    overlay.addEventListener('click', e => { if (e.target === overlay) close(); });
    overlay.querySelector('.orphan-lb-close').addEventListener('click', close);

    overlay.querySelector('.orphan-lb-create').addEventListener('click', async () => {
        const name = file.url.split('/').pop().replace(/\.[^.]+$/, '');
        await api('api/cards', { method: 'POST', body: { title: name, body: `![${name}](${file.url})`, color: '#38bdf8', position: -1 } });
        await window._reloadAll();
        close();
        openGallery();
    });

    overlay.querySelector('.orphan-lb-delete').addEventListener('click', async () => {
        const ok = await showDialog({ title: 'delete_image', message: `"${file.name}" loeschen?`, danger: true, okLabel: 'delete' });
        if (!ok) return;
        await fetch(`api/uploads/${file.name}`, { method: 'DELETE', headers: { 'X-CSRF-Token': getCsrf() } });
        close();
        openGallery();
    });

    document.body.appendChild(overlay);
}

export function closeGallery() {
    $('gallery')?.classList.remove('open');
}

$('gallery-close')?.addEventListener('click', closeGallery);
$('gallery')?.addEventListener('click', e => { if (e.target === $('gallery')) closeGallery(); });
$('gallery-btn')?.addEventListener('click', openGallery);