<template>
  <div>
    <el-upload
      :http-request="customUpload"
      :before-upload="handleBeforeUpload"
      :on-error="handleUploadError"
      name="file"
      :show-file-list="false"
      class="editor-img-uploader"
      v-if="type == 'url'"
    >
      <i ref="uploadRef" class="editor-img-uploader"></i>
    </el-upload>
  </div>
  <div class="editor">
    <quill-editor
      ref="quillEditorRef"
      v-model:content="content"
      contentType="html"
      @textChange="(e) => $emit('update:modelValue', content)"
      :options="options"
      :style="styles"
    />
  </div>
</template>

<script setup>
import axios from 'axios'
import { QuillEditor } from "@vueup/vue-quill"
import "@vueup/vue-quill/dist/vue-quill.snow.css"
import { getToken } from "@/utils/auth"
import request from "@/utils/request"

const { proxy } = getCurrentInstance()

const quillEditorRef = ref()
const uploadUrl = ref(import.meta.env.VITE_APP_BASE_API + "/common/upload") // 保留作为备用
const headers = ref({
  Authorization: "Bearer " + getToken()
})

const props = defineProps({
  /* 编辑器的内容 */
  modelValue: {
    type: String,
  },
  /* 高度 */
  height: {
    type: Number,
    default: null,
  },
  /* 最小高度 */
  minHeight: {
    type: Number,
    default: null,
  },
  /* 只读 */
  readOnly: {
    type: Boolean,
    default: false,
  },
  /* 上传文件大小限制(MB) */
  fileSize: {
    type: Number,
    default: 5,
  },
  /* 类型（base64格式、url格式） */
  type: {
    type: String,
    default: "url",
  }
})

const options = ref({
  theme: "snow",
  bounds: document.body,
  debug: "warn",
  modules: {
    // 工具栏配置
    toolbar: [
      ["bold", "italic", "underline", "strike"],      // 加粗 斜体 下划线 删除线
      ["blockquote", "code-block"],                   // 引用  代码块
      [{ list: "ordered" }, { list: "bullet" }],      // 有序、无序列表
      [{ indent: "-1" }, { indent: "+1" }],           // 缩进
      [{ size: ["small", false, "large", "huge"] }],  // 字体大小
      [{ header: [1, 2, 3, 4, 5, 6, false] }],        // 标题
      [{ color: [] }, { background: [] }],            // 字体颜色、字体背景颜色
      [{ align: [] }],                                // 对齐方式
      ["clean"],                                      // 清除文本格式
      ["link", "image", "video"]                      // 链接、图片、视频
    ],
  },
  placeholder: "请输入内容",
  readOnly: props.readOnly
})

const styles = computed(() => {
  let style = {}
  if (props.minHeight) {
    style.minHeight = `${props.minHeight}px`
  }
  if (props.height) {
    style.height = `${props.height}px`
  }
  return style
})

const content = ref("")
watch(() => props.modelValue, (v) => {
  if (v !== content.value) {
    content.value = v == undefined ? "<p></p>" : v
    // 内容更新后，为所有图片添加跨域和防盗链属性
    nextTick(() => {
      if (quillEditorRef.value && props.type == 'url') {
        const quill = quillEditorRef.value.getQuill()
        addImageAttributes(quill.root)
      }
    })
  }
}, { immediate: true })

// 如果设置了上传地址则自定义图片上传事件
onMounted(() => {
  if (props.type == 'url') {
    let quill = quillEditorRef.value.getQuill()
    let toolbar = quill.getModule("toolbar")
    toolbar.addHandler("image", (value) => {
      if (value) {
        proxy.$refs.uploadRef.click()
      } else {
        quill.format("image", false)
      }
    })
    quill.root.addEventListener('paste', handlePasteCapture, true)
    
    // 监听编辑器内容变化，为所有图片添加跨域和防盗链属性
    quill.on('text-change', () => {
      addImageAttributes(quill.root)
    })
    
    // 初始化时也为已有图片添加属性
    nextTick(() => {
      addImageAttributes(quill.root)
    })
  }
})

// 为编辑器中的所有图片添加跨域和防盗链属性
function addImageAttributes(rootElement) {
  const images = rootElement.querySelectorAll('img')
  images.forEach(img => {
    // 如果图片还没有这些属性，则添加
    if (!img.hasAttribute('crossorigin')) {
      img.setAttribute('crossorigin', 'anonymous')
    }
    if (!img.hasAttribute('referrerpolicy')) {
      img.setAttribute('referrerpolicy', 'no-referrer')
    }
    // 确保图片样式正常
    if (!img.style.maxWidth) {
      img.style.maxWidth = '100%'
      img.style.height = 'auto'
      img.style.display = 'block'
      img.style.margin = '10px 0'
    }
  })
}

// 上传前校检格式和大小
function handleBeforeUpload(file) {
  const type = ["image/jpeg", "image/jpg", "image/png", "image/svg"]
  const isJPG = type.includes(file.type)
  //检验文件格式
  if (!isJPG) {
    proxy.$modal.msgError(`图片格式错误!`)
    return false
  }
  // 校检文件大小
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize
    if (!isLt) {
      proxy.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`)
      return false
    }
  }
  return true
}

// 自定义上传方法 - 通过后端获取签名后上传到OSS
async function customUpload(options) {
  const file = options.file
  
  try {
    // 1. 从后端获取OSS签名
    const signatureResponse = await request({
      url: '/common/oss/signature',
      method: 'get',
      params: {
        dir: 'questions/images/'
      }
    })
    
    if (signatureResponse.code !== 200 || !signatureResponse.data) {
      throw new Error(signatureResponse.msg || '获取OSS签名失败')
    }
    
    const signature = signatureResponse.data
    
    // 2. 生成文件路径
    const filePath = generateFilePath(file, signature.dir)
    
    // 3. 构建FormData，使用PostObject方式上传
    const formData = new FormData()
    formData.append('key', filePath)
    formData.append('policy', signature.policy)
    formData.append('OSSAccessKeyId', signature.accessKeyId)
    formData.append('signature', signature.signature)
    formData.append('file', file)
    
    // 4. 上传到OSS
    const response = await fetch(signature.host, {
      method: 'POST',
      body: formData
    })
    
    if (response.ok || response.status === 204) {
      // 上传成功，返回OSS URL
      const ossUrl = `${signature.host}/${filePath}`
      handleUploadSuccess({
        code: 200,
        fileName: filePath,
        url: ossUrl
      }, file)
    } else {
      const errorText = await response.text()
      throw new Error(`上传失败: ${response.status} ${errorText}`)
    }
  } catch (error) {
    console.error('OSS上传失败:', error)
    proxy.$modal.msgError('上传图片失败: ' + (error.message || '未知错误'))
  }
}

// 生成文件路径
function generateFilePath(file, dir) {
  const date = new Date()
  const year = date.getFullYear()
  const month = String(date.getMonth() + 1).padStart(2, '0')
  const day = String(date.getDate()).padStart(2, '0')
  const timestamp = Date.now()
  const random = Math.random().toString(36).substring(2, 15)
  const ext = file.name.substring(file.name.lastIndexOf('.'))
  return `${dir}${year}/${month}/${day}/${timestamp}_${random}${ext}`
}

// 上传成功处理
function handleUploadSuccess(res, file) {
  // 如果上传成功
  if (res.code == 200) {
    // 获取富文本实例
    let quill = toRaw(quillEditorRef.value).getQuill()
    // 获取光标位置
    let length = quill.selection.savedRange.index
    // 插入图片，使用OSS的完整URL
    const imageUrl = res.url || (import.meta.env.VITE_APP_BASE_API + res.fileName)
    quill.insertEmbed(length, "image", imageUrl)
    
    // 等待图片插入后，为其添加跨域和防盗链属性
    nextTick(() => {
      const images = quill.root.querySelectorAll('img')
      images.forEach(img => {
        if (img.src === imageUrl || img.src.includes(imageUrl)) {
          img.setAttribute('crossorigin', 'anonymous')
          img.setAttribute('referrerpolicy', 'no-referrer')
          img.style.maxWidth = '100%'
          img.style.height = 'auto'
          img.style.display = 'block'
          img.style.margin = '10px 0'
        }
      })
    })
    
    // 调整光标到最后
    quill.setSelection(length + 1)
  } else {
    proxy.$modal.msgError("图片插入失败")
  }
}

// 上传失败处理
function handleUploadError() {
  proxy.$modal.msgError("图片插入失败")
}

// 复制粘贴图片处理
function handlePasteCapture(e) {
  const clipboard = e.clipboardData || window.clipboardData
  if (clipboard && clipboard.items) {
    for (let i = 0; i < clipboard.items.length; i++) {
      const item = clipboard.items[i]
      if (item.type.indexOf('image') !== -1) {
        e.preventDefault()
        const file = item.getAsFile()
        insertImage(file)
      }
    }
  }
}

async function insertImage(file) {
  try {
    // 使用OSS上传
    await customUpload({ file })
  } catch (error) {
    console.error('粘贴图片上传失败:', error)
    proxy.$modal.msgError('上传图片失败')
  }
}
</script>

<style>
.editor-img-uploader {
  display: none;
}
.editor, .ql-toolbar {
  white-space: pre-wrap !important;
  line-height: normal !important;
}

/* 确保富文本编辑器中的图片正常显示 */
.editor :deep(img) {
  max-width: 100% !important;
  height: auto !important;
  display: block !important;
  margin: 10px 0 !important;
  border-radius: 4px;
}
.quill-img {
  display: none;
}
.ql-snow .ql-tooltip[data-mode="link"]::before {
  content: "请输入链接地址:";
}
.ql-snow .ql-tooltip.ql-editing a.ql-action::after {
  border-right: 0px;
  content: "保存";
  padding-right: 0px;
}
.ql-snow .ql-tooltip[data-mode="video"]::before {
  content: "请输入视频地址:";
}
.ql-snow .ql-picker.ql-size .ql-picker-label::before,
.ql-snow .ql-picker.ql-size .ql-picker-item::before {
  content: "14px";
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="small"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="small"]::before {
  content: "10px";
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="large"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="large"]::before {
  content: "18px";
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="huge"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="huge"]::before {
  content: "32px";
}
.ql-snow .ql-picker.ql-header .ql-picker-label::before,
.ql-snow .ql-picker.ql-header .ql-picker-item::before {
  content: "文本";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="1"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="1"]::before {
  content: "标题1";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="2"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="2"]::before {
  content: "标题2";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="3"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="3"]::before {
  content: "标题3";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="4"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="4"]::before {
  content: "标题4";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="5"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="5"]::before {
  content: "标题5";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="6"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="6"]::before {
  content: "标题6";
}
.ql-snow .ql-picker.ql-font .ql-picker-label::before,
.ql-snow .ql-picker.ql-font .ql-picker-item::before {
  content: "标准字体";
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="serif"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="serif"]::before {
  content: "衬线字体";
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="monospace"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="monospace"]::before {
  content: "等宽字体";
}
</style>
