import { $, api, esc, showError, renderHeader, renderFooter, isAdmin, prepareImage } from './common.js';

renderHeader('patches');
renderFooter();

let patches = [];
let admin = false;   // nur der Admin-Zugang darf Patches hochladen, ändern, löschen
let editingId = null;
let imageData = null;   // data:-URL des gewählten (verkleinerten) Bildes

const imgUrl = (p) => `/patch-img/${encodeURIComponent(p.image)}`;

// ---------- Galerie ----------
function render() {
  $('#patch-empty').hidden = patches.length > 0;
  $('#patch-empty-hint').textContent = admin
    ? 'Lade über „Patch hochladen“ den ersten Patch hoch.'
    : 'Sobald der Admin einen Patch hochlädt, erscheint er hier.';
  for (const status of ['vorhanden', 'geplant']) {
    const list = patches.filter((p) => p.status === status);
    $(`#group-${status}`).hidden = list.length === 0;
    $(`#count-${status}`).textContent = list.length === 1 ? '1 Patch' : `${list.length} Patches`;
    $(`#grid-${status}`).innerHTML = list.map(patchHtml).join('');
  }
}

function patchHtml(p) {
  return `
    <article class="patch ${p.status === 'geplant' ? 'planned' : ''}" id="${p.id}">
      <button type="button" class="patch-img" data-zoom="${p.id}" aria-label="${esc(p.name)} groß anzeigen">
        <img src="${imgUrl(p)}" alt="${esc(p.name)}" loading="lazy">
      </button>
      <div class="patch-body">
        ${p.status === 'geplant' ? '<span class="badge nogame">In Planung</span>' : ''}
        <h3>${esc(p.name)}</h3>
        ${p.description ? `<p>${esc(p.description)}</p>` : ''}
        ${admin ? `
          <div class="actions">
            <button class="link" data-edit="${p.id}">Bearbeiten</button>
            <button class="link danger" data-delete="${p.id}">Löschen</button>
          </div>` : ''}
      </div>
    </article>`;
}

document.addEventListener('click', async (e) => {
  if (!e.target.closest('.patch-grid')) return;
  const zoom = e.target.closest('[data-zoom]');
  if (zoom) return openLightbox(zoom.dataset.zoom);
  const edit = e.target.closest('[data-edit]');
  if (edit) return openForm(patches.find((p) => p.id === edit.dataset.edit));
  const del = e.target.closest('[data-delete]');
  if (del) {
    const p = patches.find((x) => x.id === del.dataset.delete);
    if (!confirm(`Patch „${p.name}“ wirklich löschen?`)) return;
    try {
      await api('DELETE', `/patches/${p.id}`);
      await load();
    } catch (err) {
      showError(err);
    }
  }
});

function openLightbox(id) {
  const p = patches.find((x) => x.id === id);
  if (!p) return;
  $('#lightbox-img').src = imgUrl(p);
  $('#lightbox-img').alt = p.name;
  $('#lightbox-name').textContent = p.name;
  $('#lightbox-text').textContent = p.description;
  $('#lightbox').showModal();
}
// Klick neben das Bild schließt
$('#lightbox').addEventListener('click', (e) => {
  if (e.target === e.currentTarget) e.currentTarget.close();
});

// ---------- Formular ----------
function openForm(patch) {
  editingId = patch?.id ?? null;
  imageData = null;
  $('#patch-form').reset();
  $('#patch-error').hidden = true;
  $('#patch-form-title').textContent = patch ? 'Patch bearbeiten' : 'Patch hochladen';
  $('#patch-submit').textContent = patch ? 'Speichern' : 'Hochladen';
  $('#patch-name').value = patch?.name ?? '';
  $('#patch-description').value = patch?.description ?? '';
  $(`#patch-status-${patch?.status ?? 'vorhanden'}`).checked = true;
  showPreview(patch ? imgUrl(patch) : null);
  $('#patch-form-card').hidden = false;
  $('#patch-form-card').scrollIntoView({ behavior: 'smooth', block: 'start' });
  $('#patch-name').focus({ preventScroll: true });
}

function closeForm() {
  $('#patch-form-card').hidden = true;
  editingId = null;
  imageData = null;
}

function showPreview(src) {
  $('#patch-preview').hidden = !src;
  if (src) $('#patch-preview').src = src;
  $('#drop-text').innerHTML = src
    ? '<strong>Anderes Bild wählen</strong>'
    : '<strong>Bild auswählen</strong><br>oder hierher ziehen · PNG, JPEG, WebP oder SVG';
}


async function pickFile(file) {
  if (!file) return;
  $('#patch-error').hidden = true;
  try {
    imageData = await prepareImage(file);
    showPreview(imageData);
    if (!$('#patch-name').value) $('#patch-name').value = file.name.replace(/\.[^.]+$/, '').replace(/[-_]+/g, ' ').slice(0, 80);
  } catch (err) {
    imageData = null;
    $('#patch-error').textContent = err.message || 'Das Bild konnte nicht gelesen werden.';
    $('#patch-error').hidden = false;
  }
}

$('#patch-file').addEventListener('change', (e) => pickFile(e.target.files[0]));

const drop = $('#dropzone');
drop.addEventListener('dragover', (e) => { e.preventDefault(); drop.classList.add('over'); });
drop.addEventListener('dragleave', () => drop.classList.remove('over'));
drop.addEventListener('drop', (e) => {
  e.preventDefault();
  drop.classList.remove('over');
  pickFile(e.dataTransfer.files[0]);
});

$('#add-btn').addEventListener('click', () => openForm(null));
$('#patch-cancel').addEventListener('click', closeForm);

$('#patch-form').addEventListener('submit', async (e) => {
  e.preventDefault();
  const error = $('#patch-error');
  error.hidden = true;
  if (!editingId && !imageData) {
    error.textContent = 'Bitte zuerst ein Bild auswählen.';
    error.hidden = false;
    return;
  }
  const button = $('#patch-submit');
  button.disabled = true;
  try {
    const body = {
      name: $('#patch-name').value,
      description: $('#patch-description').value,
      status: document.querySelector('input[name="patch-status"]:checked').value,
    };
    if (imageData) body.image = imageData;
    if (editingId) await api('PUT', `/patches/${editingId}`, body);
    else await api('POST', '/patches', body);
    closeForm();
    await load();
  } catch (err) {
    error.textContent = err.message;
    error.hidden = false;
  } finally {
    button.disabled = false;
  }
});

// ---------- Laden ----------
async function load() {
  patches = await api('GET', '/patches');
  render();
}

admin = await isAdmin();
$('#add-btn').hidden = !admin;
await load().catch(showError);
// Link von der Startseite (/patches#id) springt zum Patch
if (location.hash) document.getElementById(location.hash.slice(1))?.scrollIntoView({ block: 'center' });