// ── Image gallery ──

import { $, esc, api, getCsrf } from './util.js';
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" data-orphan="${f.name}">
                    <div class="aspect-square bg-t-bg border border-t-danger/30 rounded overflow-hidden">
                        <img src="${f.url}" class="w-full h-full object-cover opacity-60" loading="lazy">
                    </div>
                    <div class="absolute top-1 right-1 flex gap-1 opacity-0 group-hover:opacity-100 transition-opacity">
                        <button class="w-6 h-6 rounded bg-t-accent text-t-bg flex items-center justify-center text-xs" data-create="${f.url}" title="create card">
                            <i class="ph ph-plus"></i>
                        </button>
                        <button class="w-6 h-6 rounded bg-t-danger text-t-bg flex items-center justify-center text-xs" data-del="${f.name}" title="delete">
                            <i class="ph ph-trash"></i>
                        </button>
                    </div>
                    <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)}">
                    <div class="aspect-square bg-t-bg border border-t-border rounded overflow-hidden">
                        <img src="${img.url}" class="w-full h-full object-cover" loading="lazy">
                    </div>
                    <div class="absolute inset-0 bg-black/60 opacity-0 group-hover:opacity-100 transition-opacity rounded flex flex-col justify-end p-2">
                        <div class="flex items-center gap-1.5">
                            <span class="w-2 h-2 rounded-full shrink-0" style="background:${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: create card from image
        grid.querySelectorAll('[data-create]').forEach(btn => {
            btn.addEventListener('click', async e => {
                e.stopPropagation();
                const url = btn.dataset.create;
                const name = url.split('/').pop().replace(/\.[^.]+$/, '');
                await api('api/cards', { method: 'POST', body: { title: name, body: `![${name}](${url})`, color: '#38bdf8', position: -1 } });
                await window._reloadAll();
                openGallery(); // refresh
            });
        });

        // Orphan: delete
        grid.querySelectorAll('[data-del]').forEach(btn => {
            btn.addEventListener('click', async e => {
                e.stopPropagation();
                const name = btn.dataset.del;
                const ok = await showDialog({ title: 'delete_image', message: `"${name}" loeschen?`, danger: true, okLabel: 'delete' });
                if (!ok) return;
                await fetch(`api/uploads/${name}`, { method: 'DELETE', headers: { 'X-CSRF-Token': getCsrf() } });
                openGallery(); // refresh
            });
        });
    }

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

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);