<template>
  <div>
    <el-upload
      v-if="this.type == 'url'"
      ref="upload"
      :action="uploadUrl"
      :before-upload="handleBeforeUpload"
      :headers="headers"
      :on-error="handleUploadError"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      name="file"
      style="display: none"
    >
    </el-upload>
    <div ref="editor" :style="styles" class="editor"></div>
  </div>
</template>

<script>
import Quill from 'quill'
import 'quill/dist/quill.core.css'
import "quill/dist/quill.snow.css";
import 'quill/dist/quill.bubble.css'
import { getToken } from '@/utils/auth'

export default {
  name: "Editor",
  props: {
    /* 编辑器的内容 */
    value: {
      type: String,
      default: ''
    },
    /* 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'
    }
  },
  data() {
    return {
      uploadUrl: process.env.VUE_APP_BASE_API + '/common/upload', // 上传的图片服务器地址
      headers: {
        Authorization: 'Bearer ' + getToken()
      },
      Quill: null,
      currentValue: '',
      options: {
        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: this.readOnly
      }
    }
  },
  computed: {
    styles() {
      let style = {}
      if (this.minHeight) {
        style.minHeight = `${this.minHeight}px`
      }
      if (this.height) {
        style.height = `${this.height}px`
      }
      return style
    }
  },
  watch: {
    value: {
      handler(val) {
        if (val !== this.currentValue) {
          this.currentValue = val === null ? '' : val
          if (this.Quill) {
            this.Quill.pasteHTML(this.currentValue)
          }
        }
      },
      immediate: true
    }
  },
  mounted() {
    this.init()
  },
  beforeDestroy() {
    this.Quill = null
  },
  methods: {
    init() {
      const editor = this.$refs.editor
      this.Quill = new Quill(editor, this.options)
      // 如果设置了上传地址则自定义图片上传事件
      if (this.type == 'url') {
        let toolbar = this.Quill.getModule('toolbar')
        toolbar.addHandler('image', (value) => {
          this.uploadType = 'image'
          if (value) {
            this.$refs.upload.$children[0].$refs.input.click()
          } else {
            this.quill.format('image', false)
          }
        })
      }
      this.Quill.pasteHTML(this.currentValue)
      this.Quill.on('text-change', (delta, oldDelta, source) => {
        const html = this.$refs.editor.children[0].innerHTML
        const text = this.Quill.getText()
        const quill = this.Quill
        this.currentValue = html
        this.$emit('input', html)
        this.$emit('on-change', { html, text, quill })
      })
      this.Quill.on('text-change', (delta, oldDelta, source) => {
        this.$emit('on-text-change', delta, oldDelta, source)
      })
      this.Quill.on('selection-change', (range, oldRange, source) => {
        this.$emit('on-selection-change', range, oldRange, source)
      })
      this.Quill.on('editor-change', (eventName, ...args) => {
        this.$emit('on-editor-change', eventName, ...args)
      })
    },
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      return true
    },
    handleUploadSuccess(res, file) {
      // 获取富文本组件实例
      let quill = this.Quill
      // 如果上传成功
      if (res.code == 200) {
        // 获取光标所在位置
        let length = quill.getSelection().index
        // 插入图片  res.url为服务器返回的图片地址
        quill.insertEmbed(length, 'image', process.env.VUE_APP_BASE_API + res.fileName)
        // 调整光标到最后
        quill.setSelection(length + 1)
      } else {
        this.$message.error('图片插入失败')
      }
    },
    handleUploadError() {
      this.$message.error('图片插入失败')
    }
  }
};
</script>

<style>
.editor, .ql-toolbar {
  white-space: pre-wrap !important;
  line-height: normal !important;
}

.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>
