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 moduleField = document.getElementById('moduleField');
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;
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();
}

filesInput.addEventListener('change', () => {
  const keep = 10 - selectedFiles.length;
  if (keep <= 0) { alert('Можно прикрепить не более 10 файлов'); filesInput.value = ''; return; }
  selectedFiles = selectedFiles.concat([...filesInput.files].slice(0, keep));
  if ([...filesInput.files].length > keep) alert('Можно прикрепить не более 10 файлов');
  filesInput.value = '';
  renderFiles();
});

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>`;
}

(async () => {
  try {
    const mRes = await fetch(`${API}/api/modules`);
    if (mRes.ok) {
      const mData = await mRes.json();
      const list = mData.modules || [];
      if (list.length) {
        list.forEach(m => {
          const opt = document.createElement('option');
          opt.value = m.id;
          opt.textContent = m.lessons_count > 0 ? `${m.name} · ${m.lessons_count} зан.` : m.name;
          moduleInput.appendChild(opt);
        });
        moduleInput.required = true;
        moduleField.style.display = '';
      }
    }
  } catch (e) { /* ignore */ }
  const res = await fetch(`${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();
    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;
  } 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() {
  try {
    stream = await navigator.mediaDevices.getUserMedia({ video: { facingMode: 'user', width: { ideal: captureWidth }, height: { ideal: captureHeight } } });
    camVideo.srcObject = stream;
    camModal.classList.add('open');
  } catch (e) {
    alert('Не удалось открыть камеру: ' + e.message);
  }
}

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

function capture() {
  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;
  }
  if (moduleField.style.display !== 'none' && !moduleInput.value) {
    toast.textContent = 'Выберите тему модуля';
    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', moduleInput.value);
  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);
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);