<template>
  <div id="app-container">
    <!-- Основная область с содержимым -->
    <main class="app-content">
      <router-view v-slot="{ Component }">
        <transition name="page-transition" mode="out-in">
          <component :is="Component" />
        </transition>
      </router-view>
    </main>

    <!-- Мобильная навигация внизу экрана -->
    <nav v-if="authState" class="mobile-nav">
      <!-- Вкладки для администратора -->
      <template v-if="currentUserIsAdmin">
        <router-link to="/admin/users" class="nav-item" active-class="active">
          <div class="nav-icon">
            <i class="bi-people"></i>
          </div>
          <span class="nav-text">Пользователи</span>
        </router-link>
        <router-link to="/admin/conversations" class="nav-item" active-class="active">
          <div class="nav-icon">
            <i class="bi-chat-square-dots"></i>
          </div>
          <span class="nav-text">Диалоги</span>
        </router-link>
        <router-link to="/admin/statistics" class="nav-item" active-class="active">
          <div class="nav-icon">
            <i class="bi-bar-chart-line"></i>
          </div>
          <span class="nav-text">Статистика</span>
        </router-link>
      </template>
      <!-- Вкладки для обычного пользователя (не показываются в админ-панели, если isAdminRoute true) -->
      <template v-else-if="!isAdminRoute">
        <router-link to="/swipe" class="nav-item" active-class="active">
          <div class="nav-icon">
            <i class="bi-search"></i>
          </div>
          <span class="nav-text">Поиск</span>
        </router-link>
        <router-link to="/chats" class="nav-item" active-class="active">
          <div class="nav-icon">
            <i class="bi-chat-dots"></i>
            <span v-if="totalUnread > 0" class="unread-badge">
              {{ totalUnread < 100 ? totalUnread : '99+' }}
            </span>
          </div>
          <span class="nav-text">Чаты</span>
        </router-link>
        <router-link to="/profile" class="nav-item" active-class="active">
          <div class="nav-icon">
            <i class="bi-person"></i>
          </div>
          <span class="nav-text">Профиль</span>
        </router-link>
      </template>
    </nav>
  </div>
</template>

<script setup>
import { useAuth } from '@/auth';
import { ref, watch, onMounted, computed, onUnmounted } from 'vue';
import { useRoute } from 'vue-router';
import api from '@/services/api';
import { getSocket, connectSocket } from '@/services/socketService';

const { user, isAuthenticated, logout, fetchUser } = useAuth();
const route = useRoute();

const userData = ref(null);
const authState = ref(false);
const conversations = ref([]);
const totalUnread = computed(() => {
  return conversations.value.reduce((sum, conv) => sum + (conv.unreadCount || 0), 0);
});

const currentUserIsAdmin = computed(() => {
  return !!user.value && !!user.value.isAdmin;
});

const isAdminRoute = computed(() => {
  return route.path.startsWith('/admin');
});

let socket = null;

const fetchConversations = async () => {
  if (!isAuthenticated.value || currentUserIsAdmin.value) return;
  try {
    const response = await api.getUserConversations();
    conversations.value = response.data;
  } catch (err) {
    console.error('[App] Ошибка при загрузке диалогов:', err);
  }
};

const handleNewMessage = (message) => {
  if (currentUserIsAdmin.value || !user.value) return;
  const senderId = typeof message.sender === 'object' ? message.sender._id : message.sender;
  if (senderId !== user.value._id) {
    setTimeout(() => {
      const conversation = conversations.value.find(c => c._id === message.conversationId);
      if (conversation) {
        const currentRoute = route.path;
        const isInThisChat = currentRoute === `/chat/${message.conversationId}`;
        if (!isInThisChat) {
          conversation.unreadCount = (conversation.unreadCount || 0) + 1;
        }
      } else {
        fetchConversations();
      }
    }, 100);
  }
};

const handleMessagesRead = ({ conversationId, readerId }) => {
  if (currentUserIsAdmin.value || !user.value) return;
  if (readerId === user.value._id) {
    const conversation = conversations.value.find(c => c._id === conversationId);
    if (conversation) {
      conversation.unreadCount = 0;
    }
  }
};

watch(() => isAuthenticated.value, (newAuthStatus, oldAuthStatus) => {
  authState.value = newAuthStatus;
  if (newAuthStatus) {
    console.log('[App.vue watch isAuthenticated] Became authenticated.');
    // Initial setup for authenticated users is handled by onMounted or watch(user.value)
  } else if (oldAuthStatus && !newAuthStatus) {
    // User is now unauthenticated (logged out).
    console.log('[App.vue watch isAuthenticated] Became unauthenticated. Cleaning up.');
    conversations.value = [];
    if (socket) {
        socket.off('getMessage', handleNewMessage);
        socket.off('messagesRead', handleMessagesRead);
        // Use userData.value for _id as user.value is null on logout
        // userData.value holds the *previous* user data here
        if (userData.value?._id && !(userData.value?.isAdmin)) { 
             socket.emit('leaveNotificationRoom', userData.value._id);
        }
    }
    userData.value = null; // Clear local userData as well
  }
});

watch(() => user.value, (newUser, oldUser) => {
  userData.value = newUser;
  if (isAuthenticated.value) {
    console.log('[App.vue watch user.value] User data changed and authenticated. Initializing/Re-initializing user state.');
    initializeUserState();
  } else if (oldUser && !newUser) {
    console.log('[App.vue watch user.value] User logged out (user.value became null).');
    // Cleanup is primarily handled by watch(isAuthenticated.value)
  }
}, { deep: true });

watch(() => route.path, (newPath, oldPath) => {
  if (isAuthenticated.value && !currentUserIsAdmin.value) {
    if (newPath.startsWith('/chat/') || oldPath?.startsWith('/chat/')) {
      setTimeout(() => {
        fetchConversations();
      }, 500);
    }
  }
});

const setupSocketConnection = () => {
  if (currentUserIsAdmin.value || !user.value?._id) return;
  socket = getSocket();
  if (!socket) {
    socket = connectSocket();
  }
  if (socket) {
    socket.off('getMessage', handleNewMessage);
    socket.off('messagesRead', handleMessagesRead);
    socket.on('getMessage', handleNewMessage);
    socket.on('messagesRead', handleMessagesRead);
    socket.emit('joinNotificationRoom', user.value._id);
    console.log('[App.vue setupSocketConnection] Socket connection configured for user:', user.value._id);
  }
};

const initializeUserState = () => {
  if (isAuthenticated.value) {
      if (!currentUserIsAdmin.value) {
        console.log('[App.vue initializeUserState] Initializing for regular user.');
        fetchConversations();
        setupSocketConnection();
      } else {
        console.log('[App.vue initializeUserState] User is Admin. Clearing any regular user socket listeners.');
        if (socket) { // Ensure any previous user socket listeners are off for admin
            socket.off('getMessage', handleNewMessage);
            socket.off('messagesRead', handleMessagesRead);
        }
      }
  }
};

onMounted(async () => {
  authState.value = isAuthenticated.value;
  userData.value = user.value;

  if (localStorage.getItem('userToken') && !user.value) {
    console.log('[App.vue onMounted] Token found, user data missing. Fetching user...');
    await fetchUser();
    console.log('[App.vue onMounted] User fetched. isAuthenticated:', isAuthenticated.value, 'isAdmin:', currentUserIsAdmin.value);
  }

  authState.value = isAuthenticated.value;
  userData.value = user.value;

  if (isAuthenticated.value) {
    if (currentUserIsAdmin.value) {
      console.log('[App.vue onMounted] Authenticated user is Admin.');
      initializeUserState(); // Handles admin case (clears user listeners)
    } else {
      console.log('[App.vue onMounted] Authenticated user is a regular user. Initializing user state.');
      initializeUserState();
    }
  } else {
    console.log('[App.vue onMounted] User is not authenticated.');
  }
});

onUnmounted(() => {
  if (socket) {
    socket.off('getMessage', handleNewMessage);
    socket.off('messagesRead', handleMessagesRead);
    if (user.value?._id && !currentUserIsAdmin.value) {
      socket.emit('leaveNotificationRoom', user.value._id);
      console.log('[App.vue onUnmounted] Left notification room for user:', user.value._id);
    }
  }
});
</script>

<style>
/* Глобальные стили */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  width: 100%;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent; /* Убирает фон при касании на мобильных */
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #212529;
  background-color: #f8f9fa;
  overscroll-behavior: none; /* Предотвращает "bounce" эффект на iOS */
  overflow: hidden;
  will-change: transform; /* Ускорение для анимаций */
}

#app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100%;
  position: relative;
  overflow: hidden;
  background-color: #f8f9fa;
}

/* Основная область содержимого */
.app-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch; /* Плавная прокрутка на iOS */
  width: 100%;
  height: calc(100% - var(--nav-height, 60px)); /* Высота за вычетом навбара */
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
}

/* Анимация переходов между страницами */
.page-transition-enter-active,
.page-transition-leave-active {
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-transition-enter-from,
.page-transition-leave-to {
  opacity: 0;
  transform: translateY(10px);
}

/* Мобильная навигация */
.mobile-nav {
  display: flex;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--nav-height, 60px);
  background: white;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: #6c757d;
  transition: all 0.2s ease;
  /* Удаляем отступы, они будут применляться по-другому */
  padding: 0;
  position: relative;
}

.nav-icon {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 3px;
  height: 28px;
}

/* Стили для индикатора непрочитанных сообщений в навигации */
.nav-icon .unread-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background: linear-gradient(135deg, #ff6b6b, #ff5252);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 10px;
  min-width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 5px;
  box-shadow: 0 2px 8px rgba(255, 107, 107, 0.4);
  border: 2px solid white;
  animation: pulse-notification 2s ease-in-out infinite;
  z-index: 1;
}

/* Анимация пульсации для привлечения внимания */
@keyframes pulse-notification {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.4);
  }
  50% {
    transform: scale(1.1);
    box-shadow: 0 3px 12px rgba(255, 107, 107, 0.6);
  }
}

/* Оборачиваем текст для лучшего управления */
.nav-text {
  font-size: 0.7rem;
  font-weight: 500;
  /* Критическое изменение: добавляем отступ чтобы поднять текст выше home indicator */
  transform: translateY(-10px);
  display: block;
}

/* Активная вкладка */
.nav-item.active {
  color: #667eea;
}

.nav-item.active .nav-icon i {
  color: #667eea;
  transform: translateY(-2px);
}

/* CSS переменные для динамической настройки */
:root {
  --nav-height: 60px;
  --header-height: 56px;
  --safe-area-bottom: 0px;
}

/* Обновленная поддержка для устройств с вырезом (iPhone X и новее) */
@supports (padding: env(safe-area-inset-bottom)) {
  :root {
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
  }
  
  .mobile-nav {
    height: calc(var(--nav-height) + var(--safe-area-bottom));
    padding-bottom: var(--safe-area-bottom);
  }
  
  .nav-item {
    /* Элемент занимает всю высоту панели, включая safe area */
    height: 100%;
    /* Добавляем флекс для размещения иконки и текста */
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 8px;
  }
  
  .app-content { /* Это правило изменяет высоту .app-content, если есть safe-area */
    height: calc(100% - (var(--nav-height) + var(--safe-area-bottom)));
  }
}

/* Адаптивные настройки для различных устройств */
@media (max-width: 576px) {
  :root {
    --nav-height: 56px;
  }
  
  .nav-item i {
    font-size: 1.3rem;
  }
}

/* Маленькие телефоны */
@media (max-width: 375px) {
  .nav-item span {
    font-size: 0.65rem;
  }
}

/* Ландшафтная ориентация на мобильных */
@media (max-height: 450px) and (orientation: landscape) {
  :root {
    --nav-height: 50px;
  }
  
  .nav-item {
    flex-direction: row;
    gap: 5px;
  }
  
  .nav-icon {
    margin-bottom: 0;
  }
}
</style>