<template>
  <van-config-provider :theme="theme" class="app-provider">
    <div class="app-root">
      <RouterView />
      <van-tabbar v-show="showTabbar" v-model="active">
        <van-tabbar-item name="ccalendar" icon="notes" to="/calendar">
          日历
        </van-tabbar-item>
        <van-tabbar-item name="statistics" icon="chart-trending-o" to="/" @click="handleTabClick('/statistics')">
          统计
        </van-tabbar-item>
        <van-tabbar-item 
          name="balance" 
          icon="balance-list" 
          :to="messageStore.unreadCount > 0 ? '/balance?tab=message' : '/balance'" 
          :badge="messageStore.unreadCount || null" 
          @click="handleTabClick('/balance')"
        >
          账单
        </van-tabbar-item>
        <van-tabbar-item name="budget" icon="bill-o" to="/budget" @click="handleTabClick('/budget')">
          预算
        </van-tabbar-item>
        <van-tabbar-item name="setting" icon="setting" to="/setting">
          设置
        </van-tabbar-item>
      </van-tabbar>
      <GlobalAddBill v-if="isShowAddBill" @success="handleAddTransactionSuccess"/>
      
      <div v-if="needRefresh" class="update-toast" @click="updateServiceWorker">
        <van-icon name="upgrade" class="update-icon" />
        <span>新版本可用，点击刷新</span>
      </div>
    </div>
  </van-config-provider>
</template>

<script setup>
import { RouterView, useRoute } from 'vue-router'
import { ref, onMounted, onUnmounted, computed, watch } from 'vue'
import { useMessageStore } from '@/stores/message'
import GlobalAddBill from '@/components/Global/GlobalAddBill.vue'
import { needRefresh, updateServiceWorker } from './registerServiceWorker'
import '@/styles/common.css'

const messageStore = useMessageStore()

const updateVh = () => {
  const vh = window.innerHeight
  document.documentElement.style.setProperty('--vh', `${vh}px`)
}

// 修复 PWA 模式下键盘收起页面不回弹的问题
const handleFocusOut = () => {
  if (/(iPhone|iPad|iPod|iOS|Android)/i.test(navigator.userAgent)) {
    // 延迟一小段时间执行，确保键盘收起动作已开始
    setTimeout(() => {
      // 强制回到顶部
      window.scrollTo(0, 0)
      // 同时也触发一次高度更新
      updateVh()
    }, 100)
  }
}

onMounted(() => {
  updateVh()
  window.addEventListener('resize', updateVh)
  if (window.visualViewport) {
    window.visualViewport.addEventListener('resize', updateVh)
  }
  // 注册全局失去焦点监听
  document.addEventListener('focusout', handleFocusOut)
})

onUnmounted(() => {
  window.removeEventListener('resize', updateVh)
  if (window.visualViewport) {
    window.visualViewport.removeEventListener('resize', updateVh)
  }
  // 销毁监听
  document.removeEventListener('focusout', handleFocusOut)
})

const route = useRoute()
// 根据路由判断是否显示Tabbar
const showTabbar = computed(() => {
  return route.path === '/' ||
    route.path === '/calendar' ||
    route.path === '/message' ||
    route.path === '/setting' ||
    route.path === '/balance' ||
    route.path === '/budget'
})

const active = ref('')
const theme = ref('light')

// 检测系统深色模式
const updateTheme = () => {
  const isDark = window.matchMedia('(prefers-color-scheme: dark)').matches
  theme.value = isDark ? 'dark' : 'light'
}

// 监听系统主题变化
let mediaQuery
onMounted(() => {
  updateTheme()
  mediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
  mediaQuery.addEventListener('change', updateTheme)
  setActive(route.path)
})

setInterval(() => {
  messageStore.updateUnreadCount()
}, 30 * 1000) // 每30秒更新一次未读消息数

// 监听路由变化调整
watch(() => route.path, (newPath) => {
  setActive(newPath)
})

const setActive = (path) => {
  active.value = (() => {
    switch (path) {
      case '/calendar':
        return 'ccalendar'
      case '/balance':
      case '/message':
        return 'balance'
      case '/setting':
        return 'setting'
      case '/budget':
        return 'budget'
      default:
        return 'statistics'
    }
  })()
  console.log(active.value, path)
}

const isShowAddBill = computed(() => {
  return route.path === '/' 
  || route.path === '/calendar' 
  || route.path === '/balance'
  || route.path === '/message'
})

onUnmounted(() => {
  if (mediaQuery) {
    mediaQuery.removeEventListener('change', updateTheme)
  }
})

// 处理tab点击，如果点击当前页面则滚动到顶部
const handleTabClick = (path) => {
  if (route.path === path) {
    window.scrollTo({ top: 0, behavior: 'smooth' })
  }
}

const handleAddTransactionSuccess = () => {
  // 当添加交易成功时，通知当前页面刷新数据
  const event = new Event('transactions-changed')
  window.dispatchEvent(event)
}

</script>

<style scoped>
.app-provider {
  /* 使用准确的视口高度 CSS 变量 */
  height: var(--vh, 100vh);
  width: 100%;
}

.app-root {
  height: 100%;
  width: 100%;
  position: relative;
  padding-top: max(0px, calc(env(safe-area-inset-top, 0px) * 0.75));
  box-sizing: border-box;
  overflow: hidden;
}

/* TabBar 固定在底部 */
:deep(.van-tabbar) {
  position: fixed !important;
  bottom: 0 !important;
  left: 0;
  right: 0;
  /* 重置所有 padding，然后只添加安全区域 */
  padding: 0 !important;
  padding-bottom: env(safe-area-inset-bottom, 0px) !important;
  height: auto !important;
  min-height: 50px !important;
  box-sizing: content-box !important;
}

/* 确保 TabBar 项目居中 */
:deep(.van-tabbar-item) {
  padding: 0 !important;
  height: 50px !important;
}

.debug-overlay {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 10px;
  font-size: 12px;
  pointer-events: auto;
}

.update-toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--van-primary-color);
  color: white;
  padding: 10px 20px;
  border-radius: 24px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 2000;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.update-toast:active {
  transform: translateX(-50%) scale(0.95);
}

.update-icon {
  font-size: 18px;
}
</style>
