// Preloader
function rt(key, fallback) {
    return (window.I18n && typeof window.I18n.t === 'function') ? window.I18n.t(key) : fallback;
}
window.addEventListener('load', () => {
  setTimeout(() => {
    document.getElementById('preloader').classList.add('hidden');
  }, 1500);
});

// Navbar scroll effect
const navbar = document.querySelector('.navbar');
window.addEventListener('scroll', () => {
  if (window.scrollY > 80) {
    navbar.classList.add('scrolled');
  } else {
    navbar.classList.remove('scrolled');
  }
});

// Scroll animations
const observerOptions = {
  threshold: 0.1,
  rootMargin: '0px 0px -50px 0px'
};

const observer = new IntersectionObserver((entries) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      entry.target.classList.add('animated');
    }
  });
}, observerOptions);

document.querySelectorAll('.animate-on-scroll').forEach(el => {
  observer.observe(el);
});

// Counter animation
const counterObserver = new IntersectionObserver((entries) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      const counters = entry.target.querySelectorAll('.counter');
      counters.forEach(counter => {
        const target = parseInt(counter.getAttribute('data-target'));
        const duration = 2000;
        const step = target / (duration / 16);
        let current = 0;
        const timer = setInterval(() => {
          current += step;
          if (current >= target) {
            counter.textContent = target;
            clearInterval(timer);
          } else {
            counter.textContent = Math.floor(current);
          }
        }, 16);
      });
      counterObserver.unobserve(entry.target);
    }
  });
}, { threshold: 0.5 });

const statsSection = document.querySelector('.hero-stats');
if (statsSection) counterObserver.observe(statsSection);

// Set min date for checkin to today
const today = new Date().toISOString().split('T')[0];
const checkinInput = document.querySelector('[name="checkin"]');
const checkoutInput = document.querySelector('[name="checkout"]');
if (checkinInput) checkinInput.min = today;
if (checkoutInput) checkoutInput.min = today;

// Booking modal - set room name
document.querySelectorAll('.btn-book').forEach(btn => {
  btn.addEventListener('click', function() {
    const room = this.getAttribute('data-room');
    document.getElementById('selectedRoom').value = room;
    const maxGuests = parseInt(this.getAttribute('data-max-guests')) || ROOM_MAX_GUESTS[room] || 4;
    updateGuestOptionsFallback(room);
    hidePriceInfo();
  });
});

function updateGuestOptionsDynamic(roomType, maxGuests) {
  const guestsSelect = document.querySelector('[name="guests"]');
  if (!guestsSelect) return;
  
  let options = [];
  for (let i = 1; i <= maxGuests; i++) {
    const key = 'booking.guest_' + i;
    let text = rt(key, i === 1 ? '1 гость' : (i < 5 ? i + ' гостя' : i + ' гостей'));
    options.push(`<option value="${i}">${text}</option>`);
  }
  
  guestsSelect.innerHTML = options.join('');
}

window.updateRoomPricesData = function(prices, maxGuests) {
  Object.assign(ROOM_PRICES, prices);
  Object.assign(ROOM_MAX_GUESTS, maxGuests);
};

function updateGuestOptions(room) {
  const guestsSelect = document.querySelector('[name="guests"]');
  if (!guestsSelect) return;
  
  const maxGuests = ROOM_MAX_GUESTS[room] || 4;
  let options = [];
  for (let i = 1; i <= maxGuests; i++) {
    const key = 'booking.guest_' + i;
    let text = rt(key, i === 1 ? '1 гость' : (i < 5 ? i + ' гостя' : i + ' гостей'));
    options.push(`<option value="${i}">${text}</option>`);
  }
  
  guestsSelect.innerHTML = options.join('');
}

function updateGuestOptionsFallback(room) {
  const guestsSelect = document.querySelector('[name="guests"]');
  if (!guestsSelect) return;
  
  const options2x = [
    { value: 1, text: rt('booking.guest_1', '1 гость') },
    { value: 2, text: rt('booking.guest_2', '2 гостя') }
  ];
  
  const options3x = [
    { value: 1, text: rt('booking.guest_1', '1 гость') },
    { value: 2, text: rt('booking.guest_2', '2 гостя') },
    { value: 3, text: rt('booking.guest_3', '3 гостя') }
  ];
  
  const optionsDefault = [
    { value: 1, text: rt('booking.guest_1', '1 гость') },
    { value: 2, text: rt('booking.guest_2', '2 гостя') },
    { value: 3, text: rt('booking.guest_3', '3 гостя') },
    { value: 4, text: rt('booking.guest_4', '4 гостя') }
  ];
  
  let options = optionsDefault;
  if (room === '2x-местный') options = options2x;
  else if (room === '3х-местный') options = options3x;
  
  guestsSelect.innerHTML = options.map(o => `<option value="${o.value}">${o.text}</option>`).join('');
}

function hideGuestOptionsUpdate() {}

// Price calculation
const ROOM_PRICES = { '2x-местный': 1500, '3х-местный': 2000, 'Семейный': 3000, 'Люкс': 4500 };
const ROOM_MAX_GUESTS = { '2x-местный': 2, '3х-местный': 3, 'Семейный': 4, 'Люкс': 4 };
let currentPromocodeData = null;

function calculateNights(checkin, checkout) {
    const ci = new Date(checkin);
    const co = new Date(checkout);
    return Math.ceil((co - ci) / (1000 * 60 * 60 * 24));
}

function validateBookingDates() {
    const checkinInput = document.querySelector('[name="checkin"]');
    const checkoutInput = document.querySelector('[name="checkout"]');
    const today = new Date();
    today.setHours(0, 0, 0, 0);
    
    if (checkinInput.value) {
        const checkinDate = new Date(checkinInput.value);
        if (checkinDate < today) {
            checkinInput.setCustomValidity(rt('booking.checkin_past', 'Дата заезда не может быть в прошлом'));
        } else {
            checkinInput.setCustomValidity('');
        }
    }
    
    if (checkinInput.value && checkoutInput.value) {
        const checkinDate = new Date(checkinInput.value);
        const checkoutDate = new Date(checkoutInput.value);
        
        if (checkoutDate <= checkinDate) {
            checkoutInput.setCustomValidity(rt('booking.checkout_before_checkin', 'Дата выезда должна быть позже даты заезда'));
        } else {
            checkoutInput.setCustomValidity('');
        }
    }
    
    return checkinInput.checkValidity() && checkoutInput.checkValidity();
}

document.querySelector('[name="checkin"]').addEventListener('change', function() { validateBookingDates(); if (typeof checkRoomAvailability === 'function') checkRoomAvailability(); });
document.querySelector('[name="checkout"]').addEventListener('change', function() { validateBookingDates(); if (typeof checkRoomAvailability === 'function') checkRoomAvailability(); });

function updatePriceDisplay(basePrice, discountPercent, discountAmount, totalPrice) {
    document.getElementById('basePriceDisplay').textContent = basePrice + ' ₽';
    document.getElementById('discountPercentDisplay').textContent = discountPercent;
    document.getElementById('discountAmountDisplay').textContent = '-' + discountAmount + ' ₽';
    document.getElementById('totalPriceDisplay').textContent = totalPrice + ' ₽';
    document.getElementById('priceInfo').style.display = 'block';
}

function hidePriceInfo() {
    document.getElementById('priceInfo').style.display = 'none';
    currentPromocodeData = null;
}

function getFormData() {
    return {
        room: document.getElementById('selectedRoom').value,
        checkin: document.querySelector('[name="checkin"]').value,
        checkout: document.querySelector('[name="checkout"]').value,
        promocode: document.getElementById('promocodeInput').value.trim()
    };
}

async function checkPromocode() {
    const { room, checkin, checkout, promocode } = getFormData();
    if (!room || !checkin || !checkout) {
        hidePriceInfo();
        return;
    }

    const guests = parseInt(document.querySelector('[name="guests"]').value) || 1;
    const basePrice = ROOM_PRICES[room] ? ROOM_PRICES[room] * guests * calculateNights(checkin, checkout) : 0;

    if (!promocode) {
        updatePriceDisplay(basePrice, 0, 0, basePrice);
        currentPromocodeData = null;
        hidePromocodeError();
        return;
    }

    try {
        const response = await fetch('/api/promocodes/validate', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ code: promocode, room_type: room, checkin, checkout, guests })
        });
        const data = await response.json();

        if (data.valid) {
            currentPromocodeData = data;
            updatePriceDisplay(data.base_price, data.discount_percent, data.discount_amount, data.total_price);
            hidePromocodeError();
        } else {
            currentPromocodeData = null;
            updatePriceDisplay(basePrice, 0, 0, basePrice);
            showPromocodeError(rt('booking.promocode_invalid', 'Промокод не найден или срок его действия истёк'));
        }
    } catch (error) {
        console.error('Promocode validation error:', error);
        showPromocodeError(rt('booking.promocode_error', 'Ошибка проверки промокода'));
    }
}

function showPromocodeError(message) {
    const errorDiv = document.getElementById('promocodeError');
    if (errorDiv) {
        errorDiv.textContent = '✖ ' + message;
        errorDiv.style.display = 'block';
    }
}

function hidePromocodeError() {
    const errorDiv = document.getElementById('promocodeError');
    if (errorDiv) {
        errorDiv.style.display = 'none';
    }
}

document.getElementById('checkPromocodeBtn').addEventListener('click', checkPromocode);
document.getElementById('promocodeInput').addEventListener('blur', checkPromocode);
document.querySelector('[name="checkin"]').addEventListener('change', checkPromocode);
document.querySelector('[name="checkout"]').addEventListener('change', checkPromocode);
document.querySelector('[name="guests"]').addEventListener('change', checkPromocode);
document.querySelectorAll('.btn-book').forEach(btn => {
    btn.addEventListener('click', function() {
        setTimeout(checkPromocode, 100);
    });
});

// Form submission
document.getElementById('bookingForm').addEventListener('submit', async function(e) {
  e.preventDefault();
  const btn = this.querySelector('.btn-submit-booking');
  const originalText = btn.innerHTML;
  
  btn.innerHTML = '<i class="fas fa-spinner fa-spin me-2"></i>' + rt('booking.sending', 'Отправка...');
  btn.disabled = true;

  const formData = {
    name: this.querySelector('[name="name"]').value,
    phone: this.querySelector('[name="phone"]').value,
    adults: parseInt(this.querySelector('[name="guests"]').value),
    children: 0,
    checkin: this.querySelector('[name="checkin"]').value,
    checkout: this.querySelector('[name="checkout"]').value,
    wishes: this.querySelector('[name="wishes"]').value,
    room: document.getElementById('selectedRoom').value,
    room_id: parseInt(document.getElementById('selectedRoomId').value) || null,
    promocode: document.getElementById('promocodeInput').value.trim() || null
  };

  try {
    const response = await fetch('/api/bookings', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(formData)
    });

    if (response.ok) {
      btn.innerHTML = '<i class="fas fa-check me-2"></i>' + rt('booking.success_sent', 'Заявка отправлена Рауфу Алексеевичу!');
      btn.style.background = '#25d366';
      this.reset();
      hidePriceInfo();
      setTimeout(() => {
        btn.innerHTML = originalText;
        btn.style.background = '';
        btn.disabled = false;
        bootstrap.Modal.getInstance(document.getElementById('bookingModal')).hide();
      }, 2500);
    } else {
      const errorData = await response.json();
      throw new Error(errorData.error || rt('booking.server_error', 'Ошибка сервера'));
    }
  } catch (error) {
    console.error('Booking error:', error);
    btn.innerHTML = '<i class="fas fa-exclamation-triangle me-2"></i>' + rt('booking.send_error', 'Ошибка отправки');
    btn.style.background = '#c9302c';
    setTimeout(() => {
      btn.innerHTML = originalText;
      btn.style.background = '';
      btn.disabled = false;
    }, 3000);
  }
});

// Smooth scroll for nav links
document.querySelectorAll('a[href^="#"]').forEach(anchor => {
  anchor.addEventListener('click', function(e) {
    e.preventDefault();
    const target = document.querySelector(this.getAttribute('href'));
    if (target) {
      target.scrollIntoView({ behavior: 'smooth', block: 'start' });
      // Close mobile menu
      const navCollapse = document.querySelector('.navbar-collapse');
      if (navCollapse.classList.contains('show')) {
        bootstrap.Collapse.getInstance(navCollapse).hide();
      }
    }
  });
});

// Hero media slideshow
let heroSlides = [];
let heroCurrentIndex = 0;
let heroTimer = null;
let heroPaused = false;

async function initHeroSlideshow() {
  const layer = document.getElementById('heroBgLayer');
  if (!layer) return;

  try {
    const resp = await fetch('/api/hero');
    if (resp.ok) {
      const media = await resp.json();
      if (media && media.length > 0) {
        heroSlides = media;
      }
    }
  } catch (e) {
    console.log('Hero API not available, using default image');
  }

  if (heroSlides.length === 0) return;

  layer.innerHTML = '';
  const defaultImg = layer.querySelector('.hero-bg-default');
  if (defaultImg) defaultImg.remove();

  heroSlides.forEach((item, i) => {
    if (item.type === 'image') {
      const img = document.createElement('img');
      img.className = 'hero-bg hero-bg-slide';
      img.src = item.path;
      img.alt = 'Hotel 777';
      img.dataset.index = i;
      if (i === 0) img.classList.add('active');
      layer.appendChild(img);
    } else if (item.type === 'video') {
      const isYouTube = item.path.includes('youtube') || item.path.includes('youtu.be');
      if (isYouTube) {
        let embedUrl = item.path;
        if (item.path.includes('watch?v=')) {
          const videoId = item.path.split('watch?v=')[1]?.split('&')[0];
          embedUrl = 'https://www.youtube.com/embed/' + videoId + '?autoplay=0&controls=0&mute=1&loop=0&playlist=' + videoId + '&enablejsapi=1';
        }
        if (item.path.includes('youtu.be/')) {
          const videoId = item.path.split('youtu.be/')[1]?.split('?')[0];
          embedUrl = 'https://www.youtube.com/embed/' + videoId + '?autoplay=0&controls=0&mute=1&loop=0&playlist=' + videoId + '&enablejsapi=1';
        }
        if (!embedUrl.includes('enablejsapi=1')) {
          embedUrl += (embedUrl.includes('?') ? '&' : '?') + 'enablejsapi=1';
        }
        const iframe = document.createElement('iframe');
        iframe.src = embedUrl;
        iframe.allow = 'autoplay; encrypted-media';
        iframe.allowFullscreen = false;
        iframe.dataset.index = i;
        iframe.dataset.type = 'youtube';
        layer.appendChild(iframe);
      } else {
        const video = document.createElement('video');
        video.src = item.path;
        video.muted = true;
        video.playsInline = true;
        video.dataset.index = i;
        video.dataset.type = 'video';
        if (i === 0) video.classList.add('active');
        layer.appendChild(video);
        video.addEventListener('ended', () => onVideoEnded(i));
      }
    }
  });

  startHeroSlideshow();
}

function startHeroSlideshow() {
  if (heroSlides.length <= 1) {
    const firstSlide = document.querySelector('#heroBgLayer .active, #heroBgLayer img[data-index="0"], #heroBgLayer video[data-index="0"]');
    if (firstSlide && firstSlide.tagName === 'VIDEO') {
      firstSlide.play().catch(() => {});
    }
    return;
  }

  showHeroSlide(0);
}

function showHeroSlide(index) {
  if (heroPaused) return;

  const layer = document.getElementById('heroBgLayer');
  if (!layer) return;

  const allSlides = layer.querySelectorAll('img, video, iframe');
  allSlides.forEach(s => s.classList.remove('active'));

  const slide = layer.querySelector(`[data-index="${index}"]`);
  if (!slide) return;

  // Reset transform on all slides (for parallax cleanup)
  allSlides.forEach(s => { if (s.tagName === 'IMG' || s.tagName === 'VIDEO') s.style.transform = ''; });

  slide.classList.add('active');
  heroCurrentIndex = index;

  if (heroTimer) clearTimeout(heroTimer);

  if (slide.tagName === 'VIDEO') {
    slide.currentTime = 0;
    slide.play().catch(() => {});
    // 'ended' event will trigger next slide
  } else if (slide.dataset.type === 'youtube') {
    // Post message to YouTube iframe to play
    const src = new URL(slide.src);
    src.searchParams.set('autoplay', '1');
    slide.src = src.toString();
    // Wait ~30 seconds for YouTube video, then advance (no reliable end event without API)
    heroTimer = setTimeout(() => goToNextSlide(), 30000);
  } else {
    // Image: show for 10 seconds
    heroTimer = setTimeout(() => goToNextSlide(), 10000);
  }
}

function onVideoEnded(index) {
  if (heroCurrentIndex !== index) return;
  goToNextSlide();
}

function goToNextSlide() {
  if (heroPaused || heroSlides.length === 0) return;
  const nextIndex = (heroCurrentIndex + 1) % heroSlides.length;

  const prevSlide = document.querySelector(`#heroBgLayer [data-index="${heroCurrentIndex}"]`);
  if (prevSlide && prevSlide.tagName === 'VIDEO') {
    prevSlide.pause();
  }
  if (prevSlide && prevSlide.dataset.type === 'youtube') {
    prevSlide.src = prevSlide.src.replace('autoplay=1', 'autoplay=0');
  }

  showHeroSlide(nextIndex);
}

document.addEventListener('visibilitychange', () => {
  heroPaused = document.hidden;
  if (!heroPaused && heroSlides.length > 1) {
    showHeroSlide(heroCurrentIndex);
  }
});

// Parallax effect on hero
window.addEventListener('scroll', () => {
  const hero = document.querySelector('#heroBgLayer .active');
  if (hero && (hero.tagName === 'IMG' || hero.tagName === 'VIDEO')) {
    const scrolled = window.scrollY;
    hero.style.transform = `scale(${1 + scrolled * 0.0001}) translateY(${scrolled * 0.3}px)`;
  } else {
    const fallback = document.querySelector('.hero-bg-default');
    if (fallback) {
      const scrolled = window.scrollY;
      fallback.style.transform = `scale(${1 + scrolled * 0.0001}) translateY(${scrolled * 0.3}px)`;
    }
  }
});

document.addEventListener('DOMContentLoaded', () => {
  initHeroSlideshow();
});

// Gallery Lightbox
function openLightbox(src, caption) {
  const lb = document.getElementById('galleryLightbox');
  const img = document.getElementById('galleryLightboxImg');
  const cap = document.getElementById('galleryLightboxCaption');
  img.src = src;
  cap.textContent = caption || '';
  lb.classList.add('active');
  document.body.style.overflow = 'hidden';
}

function closeLightbox() {
  const lb = document.getElementById('galleryLightbox');
  lb.classList.remove('active');
  document.body.style.overflow = '';
}

document.addEventListener('keydown', function(e) {
  if (e.key === 'Escape') {
    closeLightbox();
  }
});

async function loadActivities() {
  const container = document.getElementById('activitiesContainer');
  if (!container) return;

  const lang = (window.I18n && I18n.currentLang) ? I18n.currentLang : 'ru';

  try {
    const res = await fetch('/api/activities?lang=' + lang);
    if (!res.ok) throw new Error('Failed to load activities');
    const activities = await res.json();

    if (!activities.length) {
      container.innerHTML = '';
      return;
    }

    container.innerHTML = activities.map(a => {
      const imgSrc = a.image_path || '';
      const iconHtml = a.icon ? `<div class="activity-icon"><i class="${a.icon}"></i></div>` : '';
      const onclickAttr = imgSrc ? `onclick="openLightbox('${imgSrc}', '${(a.title || '').replace(/'/g, "\\'")}')"` : '';
      return `<div class="col-lg-4 animate-on-scroll">
        <div class="activity-card" ${onclickAttr}>
          ${imgSrc ? `<img src="${imgSrc}" alt="${a.title || ''}">` : ''}
          <div class="activity-overlay">
            ${iconHtml}
            <h3 class="activity-title">${a.title || ''}</h3>
            <p class="activity-desc">${a.desc || ''}</p>
          </div>
        </div>
      </div>`;
    }).join('');

    container.querySelectorAll('.animate-on-scroll').forEach(el => {
      observer.observe(el);
    });
  } catch (err) {
    console.error('Activities load error:', err);
  }
}

if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', loadActivities);
} else {
  loadActivities();
}