<template>
  <div class="text-container" @mouseup="handleTextSelect" @keyup="handleTextSelect">
    <p>
      這是一段可以選中文本的示例內(nèi)容。當(dāng)你選中這段文本時(shí)，
      將會(huì)顯示一個(gè)彈窗，展示選中文本的相關(guān)信息和操作選項(xiàng)。
      你可以嘗試選中任意文字來(lái)體驗(yàn)這個(gè)功能。
    </p>
    <p>
      Vue.js 是一個(gè)用于構(gòu)建用戶界面的漸進(jìn)式框架。它被設(shè)計(jì)為可以自底向上逐層應(yīng)用。
      Vue 的核心庫(kù)只關(guān)注視圖層，不僅易于上手，還便于與第三方庫(kù)或既有項(xiàng)目整合。
    </p>
    
    <!-- 選中文本彈窗 -->
    <div 
      v-if="showPopup" 
      class="text-popup"
      :style="{ left: popupPosition.x + 'px', top: popupPosition.y + 'px' }"
      ref="popup"
    >
      <div class="popup-content">
        <h4>選中文本</h4>
        <p class="selected-text">{{ selectedText }}</p>
        <div class="popup-actions">
          <button @click="copyText">復(fù)制文本</button>
          <button @click="searchText">搜索文本</button>
          <button @click="closePopup">關(guān)閉</button>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'TextSelectionPopup',
  data() {
    return {
      selectedText: '',
      showPopup: false,
      popupPosition: { x: 0, y: 0 },
      selectionTimeout: null
    }
  },
  methods: {
    handleTextSelect() {
      // 使用 setTimeout 確保選擇操作完成后再獲取選中文本
      if (this.selectionTimeout) {
        clearTimeout(this.selectionTimeout)
      }
      
      this.selectionTimeout = setTimeout(() => {
        const selection = window.getSelection()
        const selectedContent = selection.toString().trim()
        
        if (selectedContent && selectedContent.length > 0) {
          this.selectedText = selectedContent
          this.showPopup = true
          this.updatePopupPosition(selection)
        } else {
          this.showPopup = false
        }
      }, 10)
    },
    
    updatePopupPosition(selection) {
      if (selection.rangeCount > 0) {
        const range = selection.getRangeAt(0)
        const rect = range.getBoundingClientRect()
        
        // 計(jì)算彈窗位置，避免超出視窗
        const popupWidth = 250 // 預(yù)估彈窗寬度
        const viewportWidth = window.innerWidth
        const viewportHeight = window.innerHeight
        
        let x = rect.left + window.scrollX
        let y = rect.bottom + window.scrollY + 5
        
        // 水平位置調(diào)整
        if (x + popupWidth > viewportWidth) {
          x = rect.right + window.scrollX - popupWidth
        }
        
        // 垂直位置調(diào)整
        if (y + 200 > viewportHeight + window.scrollY) {
          y = rect.top + window.scrollY - 200
        }
        
        this.popupPosition = { x, y }
      }
    },
    
    closePopup() {
      this.showPopup = false
      this.clearSelection()
    },
    
    clearSelection() {
      const selection = window.getSelection()
      selection.removeAllRanges()
    },
    
    copyText() {
      navigator.clipboard.writeText(this.selectedText).then(() => {
        alert('文本已復(fù)制到剪貼板')
        this.closePopup()
      }).catch(() => {
        // 降級(jí)方案
        const textArea = document.createElement('textarea')
        textArea.value = this.selectedText
        document.body.appendChild(textArea)
        textArea.select()
        document.execCommand('copy')
        document.body.removeChild(textArea)
        alert('文本已復(fù)制到剪貼板')
        this.closePopup()
      })
    },
    
    searchText() {
      const searchUrl = `https://www.google.com/search?q=${encodeURIComponent(this.selectedText)}`
      window.open(searchUrl, '_blank')
      this.closePopup()
    }
  },
  
  mounted() {
    // 監(jiān)聽(tīng)點(diǎn)擊其他地方關(guān)閉彈窗
    document.addEventListener('click', (e) => {
      if (this.showPopup && !this.$refs.popup?.contains(e.target)) {
        this.closePopup()
      }
    })
  },
  
  beforeUnmount() {
    if (this.selectionTimeout) {
      clearTimeout(this.selectionTimeout)
    }
    document.removeEventListener('click', this.closePopup)
  }
}
</script>

<style scoped>
.text-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  line-height: 1.6;
  font-size: 16px;
}

.text-popup {
  position: fixed;
  z-index: 1000;
  background: white;
  border: 1px solid #ddd;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  min-width: 200px;
  max-width: 300px;
  animation: popupShow 0.2s ease-out;
}

@keyframes popupShow {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.popup-content {
  padding: 12px;
}

.popup-content h4 {
  margin: 0 0 8px 0;
  font-size: 14px;
  color: #333;
}

.selected-text {
  margin: 8px 0;
  padding: 8px;
  background: #f5f5f5;
  border-radius: 4px;
  font-size: 13px;
  word-break: break-word;
  color: #333;
}

.popup-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.popup-actions button {
  flex: 1;
  padding: 6px 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
  background: white;
  cursor: pointer;
  font-size: 12px;
  transition: all 0.2s;
}

.popup-actions button:hover {
  background: #f0f0f0;
  border-color: #999;
}

.popup-actions button:first-child {
  background: #007bff;
  color: white;
  border-color: #007bff;
}

.popup-actions button:first-child:hover {
  background: #0056b3;
  border-color: #0056b3;
}
</style>

// directives/textSelectionPopup.js
export default {
  mounted(el, binding) {
    let showPopup = false
    let selectedText = ''
    let popupTimeout = null
    
    const showSelectionPopup = () => {
      if (popupTimeout) {
        clearTimeout(popupTimeout)
      }
      
      popupTimeout = setTimeout(() => {
        const selection = window.getSelection()
        const content = selection.toString().trim()
        
        if (content && content.length > 0) {
          selectedText = content
          showPopup = true
          updatePopupPosition(selection, el)
          binding.value?.onShow?.({ text: selectedText, element: el })
        } else {
          hidePopup()
        }
      }, 10)
    }
    
    const hidePopup = () => {
      showPopup = false
      selectedText = ''
      binding.value?.onHide?.()
    }
    
    const updatePopupPosition = (selection, containerEl) => {
      if (selection.rangeCount > 0) {
        const range = selection.getRangeAt(0)
        const rect = range.getBoundingClientRect()
        const containerRect = containerEl.getBoundingClientRect()
        
        // 這里可以 emit 位置信息給父組件
        const popupData = {
          x: rect.left,
          y: rect.bottom + 5,
          width: rect.width,
          height: rect.height,
          text: selectedText
        }
        
        binding.value?.onPositionChange?.(popupData)
      }
    }
    
    // 監(jiān)聽(tīng)容器內(nèi)的選擇事件
    el.addEventListener('mouseup', showSelectionPopup)
    el.addEventListener('keyup', showSelectionPopup)
    
    // 全局點(diǎn)擊關(guān)閉
    const handleClickOutside = (e) => {
      if (showPopup && !el.contains(e.target)) {
        // 檢查點(diǎn)擊的是否是彈窗本身（需要通過(guò) binding 傳遞彈窗引用）
        hidePopup()
      }
    }
    
    // 保存清理函數(shù)
    el._textSelectionPopup = {
      showSelectionPopup,
      hidePopup,
      handleClickOutside,
      cleanup: () => {
        el.removeEventListener('mouseup', showSelectionPopup)
        el.removeEventListener('keyup', showSelectionPopup)
        document.removeEventListener('click', handleClickOutside)
        if (popupTimeout) {
          clearTimeout(popupTimeout)
        }
      }
    }
    
    document.addEventListener('click', handleClickOutside)
  },
  
  unmounted(el) {
    if (el._textSelectionPopup) {
      el._textSelectionPopup.cleanup()
    }
  }
}

import { createApp } from 'vue'
import App from './App.vue'
import textSelectionPopup from './directives/textSelectionPopup'

const app = createApp(App)
app.directive('text-selection-popup', textSelectionPopup)
app.mount('#app')

<template>
  <div 
    v-text-selection-popup="{
      onShow: handlePopupShow,
      onHide: handlePopupHide,
      onPositionChange: handlePositionChange
    }"
    class="content-area"
  >
    <h2>使用自定義指令的文本選擇區(qū)域</h2>
    <p>
      這個(gè)區(qū)域使用了自定義指令來(lái)實(shí)現(xiàn)文本選擇彈窗功能。
      指令封裝了所有的選擇檢測(cè)和彈窗邏輯，使得組件代碼更加簡(jiǎn)潔。
    </p>
    <p>
      你可以選中任意文本，系統(tǒng)會(huì)自動(dòng)檢測(cè)并觸發(fā)相應(yīng)的回調(diào)函數(shù)。
      這種方式更加靈活，可以在不同的組件中復(fù)用相同的邏輯。
    </p>
  </div>
  
  <!-- 彈窗組件（可以是全局組件） -->
  <TextSelectionPopup
    v-if="popupVisible"
    :text="selectedText"
    :position="popupPosition"
    @close="closePopup"
    @copy="copyText"
    @search="searchText"
  />
</template>

<script>
import TextSelectionPopup from './components/TextSelectionPopup.vue'

export default {
  components: {
    TextSelectionPopup
  },
  data() {
    return {
      popupVisible: false,
      selectedText: '',
      popupPosition: { x: 0, y: 0 }
    }
  },
  methods: {
    handlePopupShow(data) {
      this.selectedText = data.text
      this.popupVisible = true
      console.log('彈窗顯示', data)
    },
    
    handlePopupHide() {
      this.popupVisible = false
    },
    
    handlePositionChange(position) {
      this.popupPosition = { x: position.x, y: position.y + 20 }
    },
    
    closePopup() {
      this.popupVisible = false
    },
    
    copyText() {
      // 復(fù)制文本邏輯
      console.log('復(fù)制文本:', this.selectedText)
    },
    
    searchText() {
      // 搜索文本邏輯
      console.log('搜索文本:', this.selectedText)
    }
  }
}
</script>

// composables/useTextSelectionPopup.js
import { ref, onMounted, onUnmounted } from 'vue'

export function useTextSelectionPopup(options = {}) {
  const {
    onTextSelected = () => {},
    onPopupClose = () => {},
    popupComponent: PopupComponent = null,
    popupProps = {}
  } = options
  
  const selectedText = ref('')
  const showPopup = ref(false)
  const popupPosition = ref({ x: 0, y: 0 })
  const selectionTimeout = ref(null)
  
  const handleTextSelect = () => {
    if (selectionTimeout.value) {
      clearTimeout(selectionTimeout.value)
    }
    
    selectionTimeout.value = setTimeout(() => {
      const selection = window.getSelection()
      const content = selection.toString().trim()
      
      if (content && content.length > 0) {
        selectedText.value = content
        showPopup.value = true
        updatePopupPosition(selection)
        onTextSelected({ text: content, element: document.activeElement })
      } else {
        hidePopup()
      }
    }, 10)
  }
  
  const updatePopupPosition = (selection) => {
    if (selection.rangeCount > 0) {
      const range = selection.getRangeAt(0)
      const rect = range.getBoundingClientRect()
      
      popupPosition.value = {
        x: rect.left,
        y: rect.bottom + 5
      }
    }
  }
  
  const hidePopup = () => {
    showPopup.value = false
    selectedText.value = ''
    onPopupClose()
  }
  
  const clearSelection = () => {
    const selection = window.getSelection()
    selection.removeAllRanges()
  }
  
  const handleClickOutside = (event, popupRef) => {
    if (showPopup.value && popupRef && !popupRef.contains(event.target)) {
      hidePopup()
    }
  }
  
  onMounted(() => {
    document.addEventListener('mouseup', handleTextSelect)
    document.addEventListener('keyup', handleTextSelect)
  })
  
  onUnmounted(() => {
    if (selectionTimeout.value) {
      clearTimeout(selectionTimeout.value)
    }
    document.removeEventListener('mouseup', handleTextSelect)
    document.removeEventListener('keyup', handleTextSelect)
  })
  
  return {
    selectedText,
    showPopup,
    popupPosition,
    hidePopup,
    clearSelection,
    handleClickOutside,
    handleTextSelect
  }
}

<template>
  <div class="content-area">
    <h2>使用 Composition API 的文本選擇</h2>
    <p>
      這個(gè)示例展示了如何使用 Vue 3 的 Composition API 來(lái)封裝文本選擇彈窗功能。
      通過(guò)創(chuàng)建可復(fù)用的 composable 函數(shù)，我們可以在多個(gè)組件中輕松使用相同的功能。
    </p>
    
    <div class="text-block">
      <p>Vue 3 的 Composition API 提供了更靈活的邏輯復(fù)用方式。</p>
      <p>你可以選中這些文字來(lái)測(cè)試文本選擇彈窗功能。</p>
    </div>
    
    <!-- 如果有彈窗組件 -->
    <Teleport to="body">
      <div 
        v-if="showPopup" 
        class="global-popup"
        :style="{ left: popupPosition.x + 'px', top: popupPosition.y + 'px' }"
        ref="popupRef"
      >
        <div class="popup-content">
          <h4>選中的文本</h4>
          <p>{{ selectedText }}</p>
          <button @click="hidePopup">關(guān)閉</button>
        </div>
      </div>
    </Teleport>
  </div>
</template>

<script setup>
import { ref } from 'vue'
import { useTextSelectionPopup } from '@/composables/useTextSelectionPopup'

const popupRef = ref(null)

const {
  selectedText,
  showPopup,
  popupPosition,
  hidePopup,
  handleTextSelect
} = useTextSelectionPopup({
  onTextSelected: ({ text }) => {
    console.log('文本已選擇:', text)
  },
  onPopupClose: () => {
    console.log('彈窗已關(guān)閉')
  }
})

// 監(jiān)聽(tīng)全局點(diǎn)擊事件
const handleGlobalClick = (event) => {
  if (showPopup && popupRef.value && !popupRef.value.contains(event.target)) {
    hidePopup()
  }
}

// 在 setup 中添加全局事件監(jiān)聽(tīng)
import { onMounted, onUnmounted } from 'vue'

onMounted(() => {
  document.addEventListener('click', handleGlobalClick)
})

onUnmounted(() => {
  document.removeEventListener('click', handleGlobalClick)
})
</script>