const API = location.origin;
const form = document.getElementById('form');
const preview = document.getElementById('preview');
const placeholderSrc = preview.src;
const removePhotoBtn = document.getElementById('removePhotoBtn');
const groupInput = document.getElementById('groupInput');
const moduleInput = document.getElementById('moduleInput');
const moduleInputList = document.getElementById('moduleInputList');
const moduleField = document.getElementById('moduleField');
const moduleNames = new Map();
let moduleSearchTimer = null;
const toast = document.getElementById('toast');
const camVideo = document.getElementById('camVideo');
const camCanvas = document.getElementById('camCanvas');
const camModal = document.getElementById('camModal');
let capturedBlob = null;
let stream = null;
let camOpening = false;
const descInput = document.getElementById('descInput');
const filesInput = document.getElementById('filesInput');
const filesList = document.getElementById('filesList');
const filesClearBtn = document.getElementById('filesClearBtn');
let selectedFiles = [];
const sentPanel = document.getElementById('sentPanel');
const sentTitle = document.getElementById('sentTitle');
const sentText = document.getElementById('sentText');
const sentTimer = document.getElementById('sentTimer');
const SENT_KEY = 'whatido_entry_sent_at';
let entryCooldownMin = 30;
let captureWidth = 640;
let captureHeight = 480;
let captureQuality = 0.92;
let sentTimerId = null;

function unlockForm() {
  clearInterval(sentTimerId);
  sentTimerId = null;
  localStorage.removeItem(SENT_KEY);
  sentPanel.style.display = 'none';
  form.style.display = 'grid';
  toast.textContent = 'Можно отправить новую запись';
  toast.classList.add('show');
  setTimeout(() => toast.classList.remove('show'), 2500);
}

function tickSentTimer(unlockTime) {
  const remain = Math.max(0, unlockTime - Date.now());
  if (remain <= 0) {
    sentTimer.textContent = '';
    unlockForm();
    return;
  }
  const m = Math.floor(remain / 60000);
  const s = Math.floor((remain % 60000) / 1000);
  sentTimer.textContent = 'Новую запись можно отправить через ' + m + ' мин ' + s + ' сек';
}

function showSent(title, text, unlockTime) {
  form.style.display = 'none';
  sentPanel.style.display = 'flex';
  sentTitle.textContent = title;
  sentText.textContent = text;
  tickSentTimer(unlockTime);
  clearInterval(sentTimerId);
  sentTimerId = setInterval(() => tickSentTimer(unlockTime), 1000);
}

function cooldownMs() { return entryCooldownMin * 60 * 1000; }

function checkPreviousSend() {
  const raw = localStorage.getItem(SENT_KEY);
  if (!raw) return;
  const sentAt = parseInt(raw, 10);
  if (!Number.isFinite(sentAt)) { localStorage.removeItem(SENT_KEY); return; }
  const unlockTime = sentAt + cooldownMs();
  if (Date.now() < unlockTime) {
    showSent('Запись уже отправлена', 'Ты уже отправил(а) запись сегодня. Дождись окончания отсчёта, чтобы отправить новую.', unlockTime);
  } else {
    localStorage.removeItem(SENT_KEY);
  }
}

function humanSize(b) {
  if (b < 1024) return b + ' Б';
  if (b < 1048576) return (b / 1024).toFixed(1) + ' КБ';
  return (b / 1048576).toFixed(1) + ' МБ';
}

function renderFiles() {
  filesList.innerHTML = '';
  selectedFiles.forEach((f, i) => {
    const row = document.createElement('div');
    row.className = 'file-row';
    const name = document.createElement('span');
    name.className = 'f-name';
    name.textContent = f.name;
    name.title = f.name;
    const size = document.createElement('span');
    size.className = 'f-size';
    size.textContent = humanSize(f.size);
    const del = document.createElement('button');
    del.type = 'button';
    del.textContent = '✕';
    del.addEventListener('click', () => removeFile(i));
    row.append(name, size, del);
    filesList.appendChild(row);
  });
  filesClearBtn.classList.toggle('show', selectedFiles.length > 0);
}

function removeFile(i) {
  selectedFiles.splice(i, 1);
  renderFiles();
}

function clearFiles() {
  selectedFiles = [];
  filesInput.value = '';
  renderFiles();
}

const MAX_FILES = 10;
const DEFAULT_FILE_LIMIT_MB = 50;
const DEFAULT_TOTAL_LIMIT_MB = 200;
let MAX_FILE_BYTES = DEFAULT_FILE_LIMIT_MB * 1024 * 1024;
let MAX_TOTAL_BYTES = DEFAULT_TOTAL_LIMIT_MB * 1024 * 1024;
const BLOCKED_FILE_EXT = /\.(?:html?|js|mjs|cjs|svg|xml|json|map|wasm|php\d?|phtml|asp|aspx|jsp|sh|bat|cmd|cgi|exe|dll|com|msi|scr|hta|vbs|py|r|rb|htaccess)$/i;
const MIME_EXT = {
  'image/png': '.png', 'image/jpeg': '.jpg', 'image/jpg': '.jpg', 'image/gif': '.gif', 'image/webp': '.webp',
  'image/bmp': '.bmp', 'image/avif': '.avif', 'image/heic': '.heic', 'image/heif': '.heif', 'image/svg+xml': '.svg',
  'application/pdf': '.pdf', 'application/zip': '.zip', 'application/x-zip-compressed': '.zip',
  'application/msword': '.doc', 'application/vnd.openxmlformats-officedocument.wordprocessingml.document': '.docx',
  'application/vnd.ms-excel': '.xls', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet': '.xlsx',
  'application/vnd.ms-powerpoint': '.ppt', 'application/vnd.openxmlformats-officedocument.presentationml.presentation': '.pptx',
  'text/plain': '.txt', 'text/csv': '.csv', 'application/rtf': '.rtf',
  'application/x-rar-compressed': '.rar', 'application/vnd.rar': '.rar', 'application/x-7z-compressed': '.7z'
};
let notifyTimer = null;

function notify(text, isError) {
  toast.textContent = text;
  toast.classList.add('show');
  toast.classList.toggle('error', !!isError);
  clearTimeout(notifyTimer);
  notifyTimer = setTimeout(() => toast.classList.remove('show', 'error'), 3200);
}

function extOf(name) {
  const s = String(name || '');
  const i = s.lastIndexOf('.');
  return i > 0 ? s.slice(i).toLowerCase() : '';
}

function extFromFile(file) {
  const named = extOf(file.name);
  if (/^\.[a-z0-9]{1,8}$/i.test(named)) return named;
  const byMime = MIME_EXT[String(file.type || '').toLowerCase()];
  if (byMime) return byMime;
  const sub = String(file.type || '').split('/')[1] || '';
  return /^[a-z0-9]{1,8}$/i.test(sub) ? '.' + sub : '';
}

function pasteFileName(file) {
  const base = String(file.name || '').trim();
  const stem = base.replace(/\.[a-z0-9]{1,8}$/i, '');
  if (base && !/^(image|photo|picture|blob|file|screenshot|снимок|скриншот|изображение|файл)$/i.test(stem)) return base;
  const d = new Date();
  const pad = n => String(n).padStart(2, '0');
  const stamp = `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}-${pad(d.getMinutes())}-${pad(d.getSeconds())}`;
  return `Вставка ${stamp}${extFromFile(file)}`;
}

function totalUploadBytes() {
  return (capturedBlob ? capturedBlob.size : 0) + selectedFiles.reduce((sum, f) => sum + f.size, 0);
}

function applyUploadLimits(fileMb, totalMb) {
  const f = parseInt(fileMb, 10);
  const t = parseInt(totalMb, 10);
  const fileLimit = Number.isFinite(f) && f >= 1 ? f : DEFAULT_FILE_LIMIT_MB;
  const totalLimit = Number.isFinite(t) && t >= fileLimit ? t : Math.max(DEFAULT_TOTAL_LIMIT_MB, fileLimit);
  MAX_FILE_BYTES = fileLimit * 1024 * 1024;
  MAX_TOTAL_BYTES = totalLimit * 1024 * 1024;
}

function addFiles(list) {
  const added = [];
  const skipped = [];
  const fileLimitMb = Math.round(MAX_FILE_BYTES / 1024 / 1024);
  const totalLimitMb = Math.round(MAX_TOTAL_BYTES / 1024 / 1024);
  for (const file of list) {
    if (selectedFiles.length >= MAX_FILES) { skipped.push(`Можно прикрепить не более ${MAX_FILES} файлов`); break; }
    if (file.size > MAX_FILE_BYTES) { skipped.push(`«${file.name}» больше ${fileLimitMb} МБ`); continue; }
    if (BLOCKED_FILE_EXT.test(extOf(file.name))) { skipped.push(`«${file.name}»: недопустимый тип файла`); continue; }
    if (totalUploadBytes() + file.size > MAX_TOTAL_BYTES) { skipped.push(`Суммарный размер файлов — не более ${totalLimitMb} МБ`); break; }
    selectedFiles.push(file);
    added.push(file.name);
  }
  if (added.length) renderFiles();
  return { added, skipped };
}

filesInput.addEventListener('change', () => {
  const res = addFiles([...filesInput.files]);
  filesInput.value = '';
  if (res.skipped.length) alert(res.skipped[0]);
});

document.addEventListener('paste', (e) => {
  if (form.style.display === 'none') return;
  const clip = e.clipboardData;
  if (!clip) return;
  const pasted = [];
  for (const item of Array.from(clip.items || [])) {
    if (item.kind !== 'file') continue;
    const file = item.getAsFile();
    if (file) pasted.push(file);
  }
  if (!pasted.length && clip.files && clip.files.length) pasted.push(...Array.from(clip.files));
  if (!pasted.length) return;
  e.preventDefault();
  let filesAdded = 0;
  const skipped = [];
  for (const raw of pasted) {
    const name = pasteFileName(raw);
    const file = raw.name === name ? raw : new File([raw], name, { type: raw.type || 'application/octet-stream', lastModified: raw.lastModified });
    const res = addFiles([file]);
    filesAdded += res.added.length;
    skipped.push(...res.skipped);
  }
  if (!filesAdded) {
    if (skipped.length) notify(skipped[0], true);
    return;
  }
  const summary = filesAdded === 1 ? 'Файл добавлен' : `Файлов добавлено: ${filesAdded}`;
  notify(summary + (skipped.length ? '. ' + skipped[0] : ''), skipped.length > 0);
});

const params = new URLSearchParams(location.search);
let studentName = '';
function escName(s) { const d = document.createElement('div'); d.textContent = s; return d.innerHTML; }
if (params.get('nameInput')) {
  studentName = params.get('nameInput');
  document.getElementById('nameInput').value = studentName;
  const field = document.getElementById('nameField');
  field.innerHTML = `<label>Фамилия и имя</label><div class="fixed-name" id="fixedName">${escName(studentName)}</div>`;
}

function renderModuleOptions(list) {
  list.forEach(m => moduleNames.set(m.name, m.id));
  moduleInputList.innerHTML = '';
  list.forEach(m => {
    const opt = document.createElement('option');
    opt.value = m.name;
    moduleInputList.appendChild(opt);
  });
}

async function fetchModules(q, limit) {
  const p = new URLSearchParams();
  if (q) p.set('search', q);
  p.set('limit', String(limit));
  p.set('active', '1');
  try {
    const res = await fetch(`${API}/api/modules?${p}`);
    if (!res.ok) return [];
    const data = await res.json();
    return data.modules || [];
  } catch (e) { return []; }
}

async function resolveModuleId(name) {
  const n = (name || '').trim();
  if (!n) return null;
  if (moduleNames.has(n)) return moduleNames.get(n);
  const list = await fetchModules(n, 5);
  renderModuleOptions(list);
  const lower = n.toLowerCase();
  const exact = list.find(m => m.name.toLowerCase() === lower);
  return exact ? exact.id : null;
}

(async () => {
  try {
    const list = await fetchModules('', 50);
    if (list.length) {
      renderModuleOptions(list);
      moduleInput.required = true;
      moduleField.style.display = '';
    }
  } catch (e) { /* ignore */ }
  const res = await fetch(`${API}/api/students`);
  const students = await res.json();
  const me = studentName ? students.find(s => s.name === studentName) : null;
  if (me && me.group_id) {
    groupInput.innerHTML = `<option value="${me.group_id}" selected>${escName(me.group_name || `Группа ${me.group_id}`)}</option>`;
    groupInput.value = String(me.group_id);
  } else {
    const groupsRes = await fetch(`${API}/api/groups/active`);
    const groups = await groupsRes.json();
    groups.forEach(g => {
      const opt = document.createElement('option');
      opt.value = g.id;
      opt.textContent = g.name;
      groupInput.appendChild(opt);
    });
    if (!groups.length) {
      groupInput.innerHTML = '<option value="" disabled selected>Нет активных групп</option>';
    }
  }
  try {
    const fRes = await fetch(`${API}/api/public-settings`);
    const f = await fRes.json();
    const title = document.getElementById('title');
    if (title && (f.system_name || '').trim()) {
      title.textContent = f.system_name;
      document.title = f.system_name;
    }
    const brandLogo = document.getElementById('brandLogo');
    if (brandLogo && f.system_logo) {
      brandLogo.src = f.system_logo;
      brandLogo.hidden = false;
      brandLogo.alt = f.system_name || '';
    }
    if (f.footer_left) document.getElementById('footerLeft').textContent = f.footer_left;
    if (f.footer_right) document.getElementById('footerRight').textContent = f.footer_right;
    const c = parseInt(f.spam_interval_min, 10);
    if (Number.isFinite(c) && c >= 1) entryCooldownMin = c;
    const w = parseInt(f.photo_capture_width, 10);
    const h = parseInt(f.photo_capture_height, 10);
    if (Number.isFinite(w) && w >= 160 && w <= 4096) captureWidth = w;
    if (Number.isFinite(h) && h >= 120 && h <= 4096) captureHeight = h;
    const q = parseFloat(f.photo_capture_quality);
    if (Number.isFinite(q) && q >= 0.5 && q <= 1) captureQuality = q;
    applyUploadLimits(f.upload_file_limit_mb, f.upload_total_limit_mb);
    if (f.camera_enabled === 'false') {
      const camBtns = document.getElementById('camBtns');
      if (camBtns) camBtns.style.display = 'none';
    }
  } catch (e) { /* ignore */ }
  checkPreviousSend();
})();

function showPreview(src) {
  preview.src = src;
  preview.classList.add('has-photo');
  removePhotoBtn.classList.add('show');
}

function removePhoto() {
  preview.src = placeholderSrc;
  preview.classList.remove('has-photo');
  removePhotoBtn.classList.remove('show');
  capturedBlob = null;
}

async function openCam() {
  if (camOpening) return;
  if (stream && camModal.classList.contains('open')) return;
  camOpening = true;
  try {
    const s = await navigator.mediaDevices.getUserMedia({ video: { facingMode: 'user', width: { ideal: captureWidth }, height: { ideal: captureHeight } } });
    if (camModal.classList.contains('open')) {
      s.getTracks().forEach(t => t.stop());
      return;
    }
    stream = s;
    camVideo.srcObject = stream;
    camModal.classList.add('open');
  } catch (e) {
    alert('Не удалось открыть камеру: ' + e.message);
  } finally {
    camOpening = false;
  }
}

function closeCam() {
  camModal.classList.remove('open');
  if (stream) { stream.getTracks().forEach(t => t.stop()); stream = null; }
}

function capture() {
  if (!camVideo.videoWidth || !camVideo.videoHeight) {
    notify('Камера ещё не готова, попробуйте через секунду', true);
    return;
  }
  camCanvas.width = camVideo.videoWidth;
  camCanvas.height = camVideo.videoHeight;
  const ctx = camCanvas.getContext('2d');
  ctx.translate(camCanvas.width, 0);
  ctx.scale(-1, 1);
  ctx.drawImage(camVideo, 0, 0);
  camCanvas.toBlob(blob => {
    capturedBlob = blob;
    showPreview(URL.createObjectURL(blob));
    closeCam();
  }, 'image/jpeg', captureQuality);
}

form.addEventListener('submit', async (e) => {
  e.preventDefault();
  if (!capturedBlob) {
    toast.textContent = 'Сначала сделайте фотографию';
    toast.classList.add('show', 'error');
    setTimeout(() => toast.classList.remove('show', 'error'), 3200);
    return;
  }
  let moduleId = '';
  if (moduleField.style.display !== 'none') {
    moduleId = await resolveModuleId(moduleInput.value);
    if (!moduleId) {
      toast.textContent = 'Выберите тему модуля из списка подсказок';
      toast.classList.add('show', 'error');
      setTimeout(() => toast.classList.remove('show', 'error'), 3200);
      return;
    }
  }
  const btn = document.getElementById('submitBtn');
  btn.disabled = true;
  btn.textContent = 'Отправка...';

  const fd = new FormData();
  fd.append('photo', capturedBlob, 'photo.jpg');
  selectedFiles.forEach(f => fd.append('files', f, f.name));
  fd.append('student_name', studentName || document.getElementById('nameInput').value);
  fd.append('group_id', groupInput.value);
  fd.append('module_id', moduleId || '');
  fd.append('description', document.getElementById('descInput').value);
  fd.append('website', document.getElementById('hpWebsite').value);

  try {
    const res = await fetch(`${API}/api/entries`, { method: 'POST', body: fd });
    if (res.status === 429) {
      const e = await res.json().catch(() => ({}));
      toast.textContent = e.error || 'Уже ответили: подождите';
      toast.classList.add('show', 'error');
      setTimeout(() => toast.classList.remove('show', 'error'), 3200);
      return;
    }
    if (!res.ok) throw new Error(await res.text());
    form.reset();
    removePhoto();
    clearFiles();
    localStorage.setItem(SENT_KEY, String(Date.now()));
    showSent('Запись отправлена!', 'Спасибо! Твоя запись уже передана преподавателю.', Date.now() + cooldownMs());
  } catch (err) {
    alert('Ошибка: ' + err.message);
  } finally {
    btn.disabled = false;
    btn.textContent = 'Отправить';
  }
});

removePhotoBtn.addEventListener('click', removePhoto);
document.getElementById('openCamBtn').addEventListener('click', openCam);
preview.addEventListener('click', openCam);
preview.addEventListener('keydown', e => {
  if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); openCam(); }
});
filesClearBtn.addEventListener('click', clearFiles);
document.getElementById('filesBtn').addEventListener('click', () => document.getElementById('filesInput').click());
document.getElementById('cancelCamBtn').addEventListener('click', closeCam);
document.getElementById('captureBtn').addEventListener('click', capture);
moduleInput.addEventListener('input', () => {
  clearTimeout(moduleSearchTimer);
  const q = moduleInput.value.trim();
  moduleSearchTimer = setTimeout(async () => {
    renderModuleOptions(await fetchModules(q, 20));
  }, 250);
});
moduleInput.addEventListener('focus', async () => {
  if (!moduleInput.value.trim()) renderModuleOptions(await fetchModules('', 50));
});