'use strict';

const $ = (sel) => document.querySelector(sel);
const $$ = (sel) => Array.from(document.querySelectorAll(sel));

function toast(msg) {
  const el = document.createElement('div');
  el.className = 'toast';
  el.textContent = msg;
  document.body.appendChild(el);
  setTimeout(() => el.remove(), 2600);
}

async function api(path, opts) {
  const res = await fetch(path, {
    headers: { 'Content-Type': 'application/json' },
    ...opts,
  });
  const text = await res.text();
  let data = null;
  try { data = text ? JSON.parse(text) : null; } catch { data = { raw: text }; }
  if (!res.ok) throw new Error((data && data.error) || `HTTP ${res.status}`);
  return data;
}

function usd(n) { return (n == null ? 0 : n).toFixed(4); }
function esc(s) { return String(s == null ? '' : s).replace(/[&<>"]/g, (c) =>
  ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' }[c])); }

// --- Theme ---
function applyTheme(theme) {
  document.documentElement.setAttribute('data-theme', theme);
  const btn = $('#themeToggle');
  btn.textContent = theme === 'dark' ? '🌙 Тёмная' : '☀️ Светлая';
  localStorage.setItem('nexus-theme', theme);
}
$('#themeToggle').addEventListener('click', () => {
  const cur = document.documentElement.getAttribute('data-theme');
  applyTheme(cur === 'dark' ? 'light' : 'dark');
});
applyTheme(localStorage.getItem('nexus-theme') || 'dark');

// --- Tabs ---
$$('nav button').forEach((btn) => {
  btn.addEventListener('click', () => {
    $$('nav button').forEach((b) => b.classList.remove('active'));
    btn.classList.add('active');
    $$('main section').forEach((s) => s.classList.add('hidden'));
    $(`#tab-${btn.dataset.tab}`).classList.remove('hidden');
    if (btn.dataset.tab === 'usage') loadStats();
    if (btn.dataset.tab === 'gallery') loadGallery();
    if (btn.dataset.tab === 'providers') loadProviders();
  });
});

// --- Usage ---
async function loadStats() {
  const range = $('#statsRange').value;
  const q = range ? `?sinceDays=${range}` : '';
  const s = await api(`/api/stats${q}`);
  $('#statCards').innerHTML = `
    <div class="stat"><div class="n">$${usd(s.totalCostUsd)}</div><div class="l">Всего потрачено</div></div>
    <div class="stat"><div class="n">${s.totalCount}</div><div class="l">Всего операций</div></div>
    <div class="stat"><div class="n">${s.byProvider.length}</div><div class="l">Провайдеров</div></div>
    <div class="stat"><div class="n">${s.byCapability.length}</div><div class="l">Типов операций</div></div>`;
  const fill = (id, rows, key) => {
    $(`#${id} tbody`).innerHTML = rows.map((r) =>
      `<tr><td>${esc(r[key])}</td><td>${r.count}</td><td>$${usd(r.costUsd)}</td></tr>`).join('')
      || '<tr><td colspan="3" class="muted">Нет данных</td></tr>';
  };
  fill('byProvider', s.byProvider, 'provider');
  fill('byCapability', s.byCapability, 'capability');
  fill('byDay', s.byDay, 'day');
}
$('#statsRange').addEventListener('change', loadStats);

// --- Gallery (with pagination) ---
let galleryOffset = 0;
let galleryLastCount = 0;

function pageSize() { return parseInt($('#pageSize').value, 10) || 50; }

async function loadGallery() {
  const cap = $('#galleryFilter').value;
  const limit = pageSize();
  const params = new URLSearchParams();
  params.set('limit', String(limit));
  params.set('offset', String(galleryOffset));
  if (cap) params.set('capability', cap);
  const { items } = await api(`/api/generations?${params.toString()}`);
  galleryLastCount = items.length;
  $('#gallery').innerHTML = items.map(renderTile).join('')
    || '<div class="muted">Пока нет сгенерированного контента.</div>';
  const page = Math.floor(galleryOffset / limit) + 1;
  $('#pageInfo').textContent = `Страница ${page} · показано ${items.length}`;
  $('#prevPage').disabled = galleryOffset === 0;
  $('#nextPage').disabled = items.length < limit;

  $$('[data-view]').forEach((el) => el.onclick = () => openModal(el.dataset.view));
  $$('[data-del]').forEach((b) => b.onclick = (e) => { e.stopPropagation(); delGeneration(b.dataset.del); });
}

function renderTile(it) {
  const cost = it.costUsd != null ? `$${usd(it.costUsd)}` : '';
  let media = '';
  if (it.mediaUrl) {
    if (it.capability === 'image') media = `<div class="thumb" data-view="${it.id}"><img src="${it.mediaUrl}" loading="lazy" /></div>`;
    else if (it.capability === 'tts' || it.capability === 'music') media = `<div style="padding:10px"><audio controls src="${it.mediaUrl}"></audio></div>`;
    else if (it.capability === 'video') media = `<div class="thumb" data-view="${it.id}"><video style="width:100%;height:150px;background:#000" src="${it.mediaUrl}"></video></div>`;
    else media = `<a href="${it.mediaUrl}" target="_blank" style="display:block;padding:20px;text-align:center">Открыть файл</a>`;
  } else {
    const status = it.status === 'failed' ? '⚠ ошибка' : 'нет локального файла';
    media = `<div style="height:150px;display:flex;align-items:center;justify-content:center" class="muted">${status}</div>`;
  }
  return `<div class="tile">
    <button class="del" data-del="${it.id}" title="Удалить">✕</button>
    ${media}
    <div class="meta">
      <div>${esc(it.capability)} · <span class="m">${cost}</span></div>
      <div class="m">${esc(it.model)}</div>
      <div class="m">${new Date(it.createdAt).toLocaleString()}</div>
    </div>
  </div>`;
}

$('#galleryReload').addEventListener('click', () => { galleryOffset = 0; loadGallery(); });
$('#galleryFilter').addEventListener('change', () => { galleryOffset = 0; loadGallery(); });
$('#pageSize').addEventListener('change', () => { galleryOffset = 0; loadGallery(); });
$('#prevPage').addEventListener('click', () => {
  galleryOffset = Math.max(0, galleryOffset - pageSize());
  loadGallery();
});
$('#nextPage').addEventListener('click', () => {
  if (galleryLastCount < pageSize()) return;
  galleryOffset += pageSize();
  loadGallery();
});

// --- Modal viewer ---
async function openModal(id) {
  let rec;
  try { rec = await api(`/api/generations/${encodeURIComponent(id)}`); }
  catch (e) { return toast('Ошибка: ' + e.message); }

  let body = '';
  if (rec.mediaUrl && rec.capability === 'image') body = `<img src="${rec.mediaUrl}" />`;
  else if (rec.mediaUrl && rec.capability === 'video') body = `<video controls autoplay src="${rec.mediaUrl}"></video>`;
  else if (rec.mediaUrl && (rec.capability === 'tts' || rec.capability === 'music')) body = `<audio controls autoplay src="${rec.mediaUrl}"></audio>`;
  else body = `<div class="muted">Нет предпросмотра для этого типа.</div>`;

  const kv = `
    <div class="kv">Модель: ${esc(rec.model)}</div>
    <div class="kv">Провайдер: ${esc(rec.provider)} · Возможность: ${esc(rec.capability)}</div>
    <div class="kv">Стоимость: ${rec.costUsd != null ? '$' + usd(rec.costUsd) : '—'}</div>
    <div class="kv">Создано: ${new Date(rec.createdAt).toLocaleString()}</div>
    ${rec.inputSummary ? `<div class="kv">Вход: ${esc(rec.inputSummary)}</div>` : ''}
    ${rec.error ? `<div class="kv" style="color:var(--err)">Ошибка: ${esc(rec.error)}</div>` : ''}`;

  $('#modalRoot').innerHTML = `
    <div class="modal-backdrop" id="modalBackdrop">
      <div class="modal">
        <div class="modal-head">
          <strong>${esc(rec.capability)} · ${esc(rec.model)}</strong>
          <span class="spacer"></span>
          ${rec.mediaUrl ? `<a class="ghost" href="${rec.mediaUrl}" target="_blank" style="text-decoration:none">Открыть в новой вкладке</a>` : ''}
          <button class="ghost danger" id="modalDel">Удалить</button>
          <button class="ghost" id="modalClose">Закрыть ✕</button>
        </div>
        <div class="modal-body">${body}${kv}</div>
      </div>
    </div>`;

  const close = () => { $('#modalRoot').innerHTML = ''; };
  $('#modalClose').onclick = close;
  $('#modalBackdrop').onclick = (e) => { if (e.target.id === 'modalBackdrop') close(); };
  document.addEventListener('keydown', function onEsc(e) {
    if (e.key === 'Escape') { close(); document.removeEventListener('keydown', onEsc); }
  });
  $('#modalDel').onclick = async () => {
    if (!confirm('Удалить этот контент?')) return;
    await delGeneration(id, true);
    close();
  };
}

async function delGeneration(id, silent) {
  if (!silent && !confirm('Удалить этот контент?')) return;
  try {
    await api(`/api/generations/${encodeURIComponent(id)}`, { method: 'DELETE' });
    toast('Удалено');
    loadGallery();
  } catch (e) { toast('Ошибка: ' + e.message); }
}

// --- Providers ---
let CRYPTO_ENABLED = true;
async function loadProviders() {
  const { providers, knownTypes, cryptoEnabled } = await api('/api/providers');
  CRYPTO_ENABLED = cryptoEnabled;
  $('#cryptoBadge').textContent = cryptoEnabled
    ? 'Шифрование ключей: включено'
    : '⚠ NEXUS_MASTER_KEY не задан — ключи из БД недоступны';
  const typeSel = $('#pType');
  if (!typeSel.options.length) {
    typeSel.innerHTML = knownTypes.map((t) => `<option value="${esc(t)}">${esc(t)}</option>`).join('');
  }
  $('#providersTable tbody').innerHTML = providers.map((p) => {
    const status = [
      p.isDefault ? '<span class="pill def">default</span>' : '',
      p.enabled ? '<span class="pill on">включён</span>' : '<span class="pill off">выключен</span>',
    ].join(' ');
    return `<tr>
      <td>${esc(p.name)}</td>
      <td>${esc(p.type)}</td>
      <td>${p.hasKey ? `<code>${esc(p.keyHint || '••••')}</code>` : '<span class="muted">нет</span>'}</td>
      <td>${status}</td>
      <td>
        <button class="ghost" data-check="${esc(p.name)}">Проверить</button>
        <button class="ghost" data-toggle="${esc(p.name)}" data-en="${p.enabled}">${p.enabled ? 'Выключить' : 'Включить'}</button>
        <button class="ghost" data-default="${esc(p.name)}">Сделать default</button>
        <button class="ghost danger" data-del-provider="${esc(p.name)}">Удалить</button>
      </td>
    </tr>`;
  }).join('') || '<tr><td colspan="5" class="muted">Нет провайдеров. Добавьте выше.</td></tr>';

  $$('[data-check]').forEach((b) => b.onclick = () => checkProvider(b.dataset.check));
  $$('[data-toggle]').forEach((b) => b.onclick = () => toggleProvider(b.dataset.toggle, b.dataset.en !== 'true'));
  $$('[data-default]').forEach((b) => b.onclick = () => setDefault(b.dataset.default));
  $$('[data-del-provider]').forEach((b) => b.onclick = () => delProvider(b.dataset.delProvider));
}

$('#pSave').addEventListener('click', async () => {
  try {
    const body = {
      name: $('#pName').value.trim(),
      type: $('#pType').value,
      baseUrl: $('#pBaseUrl').value.trim() || undefined,
      apiKey: $('#pKey').value.trim() || undefined,
      isDefault: $('#pDefault').value === 'true',
      enabled: $('#pEnabled').value === 'true',
    };
    if (!body.name) return toast('Укажите имя');
    if (body.apiKey && !CRYPTO_ENABLED) return toast('Нельзя сохранить ключ без NEXUS_MASTER_KEY');
    await api('/api/providers', { method: 'POST', body: JSON.stringify(body) });
    $('#pKey').value = '';
    toast('Сохранено');
    loadProviders();
  } catch (e) { toast('Ошибка: ' + e.message); }
});

async function checkProvider(name) {
  try {
    toast('Проверяю ключ...');
    const r = await api(`/api/providers/${encodeURIComponent(name)}/check`, { method: 'POST', body: '{}' });
    toast(r.ok ? `OK · моделей: ${r.modelsCount}` : `Ошибка ключа: ${r.error}`);
  } catch (e) { toast('Ошибка: ' + e.message); }
}
async function toggleProvider(name, enabled) {
  try { await api(`/api/providers/${encodeURIComponent(name)}/enabled`, { method: 'POST', body: JSON.stringify({ enabled }) }); loadProviders(); }
  catch (e) { toast('Ошибка: ' + e.message); }
}
async function setDefault(name) {
  try { await api(`/api/providers/${encodeURIComponent(name)}/default`, { method: 'POST', body: '{}' }); loadProviders(); }
  catch (e) { toast('Ошибка: ' + e.message); }
}
async function delProvider(name) {
  if (!confirm(`Удалить провайдера "${name}"?`)) return;
  try { await api(`/api/providers/${encodeURIComponent(name)}`, { method: 'DELETE' }); loadProviders(); }
  catch (e) { toast('Ошибка: ' + e.message); }
}

// initial
loadStats();