<template>
  <div class="label-render-container">
    <!-- 操作按钮 -->
    <div class="action-buttons">
      <el-button type="primary" @click="downloadLabelAsImage">下载标签图片</el-button>
      <el-button type="primary" @click="printLabel" style="margin-left: 10px;">打印标签</el-button>
    </div>
    <!-- 标签预览容器 -->
    <div class="preview-container" id="label-preview-container" ref="labelRef">
      <ProductionTagPreview v-if="labelType === '2'" :content="content" />
      <OuterTagPreview v-if="labelType === '3'" :content="content" />
      <SampleTagPreview v-if="labelType === '4'" :content="content" />
      <ForgeTagPreview v-if="labelType === '5'" :content="content" />
      <SaltSprayTagPreview v-if="labelType === '6'" :content="content" />
    </div>
  </div>
</template>

<script>
import domToImage from 'dom-to-image';
import printJS from 'print-js';
import { Message } from 'element-ui'; // 若使用Element UI，引入消息提示

import ProductionTagPreview from './ProductionTagPreview.vue';
import OuterTagPreview from './OuterTagPreview.vue';
import SampleTagPreview from './SampleTagPreview.vue';
import ForgeTagPreview from './ForgeTagPreview.vue';
import SaltSprayTagPreview from './SaltSprayTagPreview.vue';

export default {
  name: 'LabelRender',
  components: {
    ProductionTagPreview,
    OuterTagPreview,
    SampleTagPreview,
    ForgeTagPreview,
    SaltSprayTagPreview,
  },
  props: {
    labelType: {
      type: String,
      required: true,
    },
    content: {
      type: Object,
      required: true,
    },
  },
  methods: {
    // -------- 图片下载方法 --------
    async downloadLabelAsImage() {
      // 1. 获取要转换的DOM容器
      const labelContainer = document.getElementById('label-preview-container');
      if (!labelContainer) {
        Message.error('未找到标签容器，无法下载');
        return;
      }

      try {
        // 2. 用dom-to-image生成PNG图片的DataURL
        const dataUrl = await domToImage.toPng(labelContainer);

        // 3. 创建临时a标签，触发下载
        const downloadLink = document.createElement('a');
        downloadLink.href = dataUrl;
        downloadLink.download = `标签_${new Date().getTime()}.png`; // 自定义文件名（带时间戳防重复）
        document.body.appendChild(downloadLink);
        downloadLink.click();
        document.body.removeChild(downloadLink); // 下载后移除临时标签
      } catch (error) {
        console.error('标签图片下载失败：', error);
        Message.error('标签图片下载失败，请重试');
      }
    },

    // 打印方法
    printLabel() {
      // 1. 获取标签容器DOM
      const labelContainer = document.getElementById('label-preview-container');
      if (!labelContainer) {
        Message.error('未找到标签容器，无法打印');
        return;
      }

      // 4. 调用print-js打印
      printJS({
        printable: 'label-preview-container', // 要打印的元素ID
        type: 'html', // 打印类型为HTML
        header: null, // 不显示页眉
        footer: null, // 不显示页脚
        // style: printStyles, // 注入打印样式
        scanStyles: true, // 禁用自动扫描页面样式（避免冲突）
        targetStyles: ['*'], // 允许所有样式生效
        printContainer: true, // 打印指定容器
        onError: (error) => { // 错误处理
          console.error('打印失败:', error);
          Message.error('打印失败，请重试');
        }
      });
    }
  },
};
</script>

<style scoped>
.label-render-container {
  width: 100%;
  height: calc(100vh - 200px);
  display: flex;
  flex-direction: column;
  /* 按钮与预览垂直排列 */
  justify-content: flex-start;
  align-items: center;
  padding: 2rem;
  box-sizing: border-box;
}

.action-buttons {
  margin-bottom: 1rem;
  /* 按钮与预览区的间距 */
}

.preview-container {
  background-color: #fff;
  color: #000;
  padding: 1.5rem;
  width: fit-content;
  min-width: 200px;
  border-radius: 6px;
  box-shadow: 0 0 60px rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  transition: all 0.3s ease;
}

.preview-container:hover {
  box-shadow: 0 0 80px rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}
</style>