<template>
  <el-config-provider :locale="zhCn">
    <!-- 主容器 -->
    <div class="p-6 bg-white rounded-lg shadow-md min-h-screen pb-24" v-loading="loading">

      <!-- 头部区域 -->
      <div class="flex justify-between items-center mb-6">
        <span class="text-2xl font-bold text-gray-700">文章管理列表</span>
        <el-button type="primary" :icon="Plus" @click="handleCreate">新建文章</el-button>
      </div>

      <!-- 文章表格 -->
      <el-table :data="tableData" style="width: 100%" row-key="id">
        <el-table-column prop="id" label="ID" width="80" sortable fixed></el-table-column>
        <el-table-column label="封面" width="180">
          <template #default="scope">
            <el-image style="width: 120px; height: 70px; border-radius: 6px;" :src="scope.row.cover" :preview-src-list="[scope.row.cover]" fit="cover" :preview-teleported="true" hide-on-click-modal>
              <template #error>
                <div class="flex items-center justify-center w-full h-full bg-gray-100 text-gray-500">加载失败</div>
              </template>
            </el-image>
          </template>
        </el-table-column>
        <el-table-column prop="title" label="标题" min-width="200" show-overflow-tooltip>
          <template #default="scope">
            <span class="font-semibold">{{ scope.row.title }}</span>
          </template>
        </el-table-column>
        <el-table-column label="文章内容" min-width="300">
          <template #default="scope">
            <div class="content-preview" :title="scope.row.content">
              {{ scope.row.content.length > 100 ? `${scope.row.content.slice(0, 100)}...` : scope.row.content }}
            </div>
            <el-button size="mini" type="text" class="mt-1 text-blue-600" @click="handleViewContent(scope.row)">查看详情</el-button>
          </template>
        </el-table-column>
        <el-table-column prop="topic" label="主题" width="120"></el-table-column>
        <el-table-column prop="excerpt" label="摘要" min-width="250" show-overflow-tooltip></el-table-column>
        <el-table-column prop="create_at" label="创建时间" width="180" sortable></el-table-column>
        <el-table-column prop="update_at" label="更新时间" width="180" sortable></el-table-column>
        <el-table-column label="操作" width="200" fixed="right">
          <template #default="scope">
            <div class="action-buttons">
              <el-button size="small" type="primary" :icon="Edit" @click="handleEdit(scope.row)">编辑</el-button>
              <el-button size="small" type="danger" :icon="Delete" @click="handleDelete(scope.row)">删除</el-button>
            </div>
          </template>
        </el-table-column>
      </el-table>

      <!-- Content 详情弹窗 -->
      <el-dialog v-model="contentDialogVisible" title="文章内容详情" :width="`800px`" :before-close="handleCloseDialog">
        <el-card class="p-4">
          <h3 class="text-xl font-bold text-gray-800 mb-4">{{ currentArticle.title }}</h3>
          <div class="content-full text-gray-700 leading-relaxed whitespace-pre-wrap">
            {{ currentArticle.content || "当前文章暂无内容" }}
          </div>
        </el-card>
      </el-dialog>
    </div>

    <!-- 分页器容器 -->
    <div class="fixed bottom-0 right-0 w-full p-4 bg-white shadow-[0_-2px_5px_rgba(0,0,0,0.05)] flex justify-end z-10 border-t border-gray-200">
      <el-pagination class="custom-pagination" background layout="total, sizes, prev, pager, next, jumper" :total="total" v-model:current-page="currentPage" v-model:page-size="pageSize" :page-sizes="[10, 20, 50, 100]" @size-change="handleSizeChange" @current-change="handleCurrentChange"></el-pagination>
    </div>

    <!-- ==================================================== -->
    <!--          🔥 文章编辑/新建抽屉 (已修改) 🔥          -->
    <!-- ==================================================== -->
    <el-drawer v-model="drawerVisible" :title="isEditMode ? '编辑文章' : '发表新文章'" direction="rtl" size="60%" :before-close="handleDrawerClose" destroy-on-close>
      <div class="publish-form-container">
        <!-- 1. 文章标题输入 -->
        <div class="form-group title-group">
          <label class="form-label">文章标题</label>
          <el-input v-model="form.title" placeholder="请输入文章标题" clearable :disabled="isSubmitting" />
        </div>

        <!-- 2. 专题选择 (仅在新建时显示) -->
        <div v-if="!isEditMode" class="form-group topic-group">
          <label class="form-label">发表到专题</label>
          <el-radio-group v-model="form.topic" :disabled="isSubmitting">
            <el-radio label="news">新闻</el-radio>
            <el-radio label="cases">案例资源</el-radio>
            <el-radio label="community">社区服务</el-radio>
          </el-radio-group>
        </div>

        <!-- 3. 封面图上传 -->
        <div class="form-group cover-group">
          <label class="form-label">文章封面</label>
          <el-upload action="http://localhost:8080/api/upload/cover" name="image" :show-file-list="false" :on-success="handleCoverSuccess" :before-upload="beforeCoverUpload" :on-error="handleCoverError" :disabled="isSubmitting">
            <img v-if="form.cover" :src="form.cover" class="cover-preview" alt="封面"/>
            <el-icon v-else class="cover-uploader-icon"><Plus /></el-icon>
          </el-upload>
        </div>

        <!-- 4. 文章摘要编辑 -->
        <div class="form-group excerpt-group">
          <label class="form-label">文章摘要</label>
          <el-input
              v-model="form.excerpt"
              type="textarea"
              :rows="4"
              placeholder="请输入文章摘要（可选，若不填则自动从正文截取）"
              clearable
              :disabled="isSubmitting"
          />
        </div>

        <!-- 5. 文章内容富文本编辑 -->
        <div class="form-group content-group">
          <label class="form-label">文章内容</label>
          <div ref="editorRef" class="quill-editor"></div>
        </div>
      </div>

      <template #footer>
        <div style="flex: auto">
          <el-button @click="handleDrawerClose">取消</el-button>
          <el-button type="primary" @click="submitArticle" :loading="isSubmitting">
            {{ isEditMode ? '更新文章' : '发布文章' }}
          </el-button>
        </div>
      </template>
    </el-drawer>

  </el-config-provider>
</template>

<script lang="ts" setup>
import { ref, onMounted, watch, nextTick } from 'vue';
import { ElMessage, ElMessageBox, ElDialog, ElConfigProvider, ElDrawer, ElInput, ElRadioGroup, ElRadio, ElUpload } from 'element-plus';
import { Edit, Delete, Plus } from '@element-plus/icons-vue';
import zhCn from 'element-plus/dist/locale/zh-cn.mjs';
import Quill from 'quill';
import 'quill/dist/quill.snow.css';
import type { UploadProps } from 'element-plus';

// --- 类型定义 ---
interface Article {
  id: number;
  title: string;
  content: string;
  cover: string;
  create_at: string;
  update_at: string;
  is_delete: number;
  topic: string;
  excerpt: string;
}

interface ListArticleReq {
  page: number;
  size: number;
}

// --- API 基地址 ---
const API_BASE_URL = 'http://localhost:8080/api';

// =================================================================
//                      列表页相关状态与逻辑
// =================================================================
const loading = ref(true);
const tableData = ref<Article[]>([]);
const currentPage = ref(1);
const pageSize = ref(10);
const total = ref(0);
const contentDialogVisible = ref(false);
const currentArticle = ref<Article>({ id: 0, title: '', content: '', cover: '', create_at: '', update_at: '', is_delete: 0, topic: '', excerpt: '' });

const fetchData = async () => {
  loading.value = true;
  try {
    const reqData: ListArticleReq = { page: currentPage.value, size: pageSize.value };
    const response = await fetch(`${API_BASE_URL}/articles/getarticle`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(reqData)
    });
    if (!response.ok) throw new Error(`请求失败！状态码：${response.status}`);
    const data = await response.json();
    tableData.value = data.Article_list || [];
    total.value = data.total || 0;
  } catch (error) {
    console.error('[ERROR] 获取文章列表失败：', error);
    ElMessage.error('获取文章列表失败，请检查接口或网络！');
  } finally {
    loading.value = false;
  }
};

onMounted(fetchData);

const handleViewContent = (row: Article) => {
  currentArticle.value = { ...row };
  contentDialogVisible.value = true;
};

const handleCloseDialog = () => {
  contentDialogVisible.value = false;
};

const handleDelete = (row: Article) => {
  ElMessageBox.confirm(`确定要删除文章《${row.title}》吗？此操作无法撤销！`, '警告', { confirmButtonText: '确定删除', cancelButtonText: '取消', type: 'warning' })
      .then(async () => {
        try {
          const response = await fetch(`${API_BASE_URL}/articles/${row.id}`, { method: 'DELETE' });
          if (!response.ok) throw new Error('删除失败');
          ElMessage.success('删除成功！');
          fetchData();
        } catch (error) {
          console.error('[ERROR] 删除文章失败：', error);
          ElMessage.error('删除文章失败，请重试！');
        }
      })
      .catch(() => ElMessage.info('已取消删除'));
};

const handleSizeChange = (val: number) => {
  pageSize.value = val;
  currentPage.value = 1;
  fetchData();
};

const handleCurrentChange = (val: number) => {
  currentPage.value = val;
  fetchData();
};

// =================================================================
//                      抽屉编辑/新建相关状态与逻辑
// =================================================================
const drawerVisible = ref(false);
const isEditMode = ref(false);
const isSubmitting = ref(false);

const defaultFormState = () => ({
  id: null as number | null,
  title: '',
  topic: 'news',
  cover: '',
  content: '',
  excerpt: '',
});
const form = ref(defaultFormState());

// --- 富文本编辑器 ---
const editorRef = ref<HTMLDivElement | null>(null);
let quillInstance: Quill | null = null;

const initQuillEditor = () => {
  if (editorRef.value && !quillInstance) {
    quillInstance = new Quill(editorRef.value, {
      theme: 'snow',
      modules: { toolbar: [['bold', 'italic', 'underline'], ['link', 'image']] },
      placeholder: '请开始创作你的文章...'
    });
  }
};

watch(drawerVisible, (visible) => {
  if (visible) {
    nextTick(() => {
      initQuillEditor();
      if (isEditMode.value) {
        if (quillInstance) {
          quillInstance.root.innerHTML = form.value.content;
        }
      } else {
        if (quillInstance) {
          quillInstance.setContents([]);
        }
      }
    });
  } else {
    // 🔥 关键修复：当抽屉关闭时，将实例重置为 null。
    // `destroy-on-close` 属性会处理 DOM 的销毁。
    quillInstance = null;
  }
});

// --- 操作处理 ---
const resetForm = () => {
  form.value = defaultFormState();
  if (quillInstance) {
    quillInstance.setContents([]);
  }
};

const handleCreate = () => {
  isEditMode.value = false;
  resetForm();
  drawerVisible.value = true;
};

const handleEdit = (row: Article) => {
  isEditMode.value = true;
  form.value = {
    id: row.id,
    title: row.title,
    topic: row.topic,
    cover: row.cover,
    excerpt: row.excerpt,
    content: row.content,
  };
  drawerVisible.value = true;
};

const handleDrawerClose = () => {
  drawerVisible.value = false;
};

const submitArticle = async () => {
  if (!form.value.title) {
    ElMessage.warning('请输入文章标题');
    return;
  }

  isSubmitting.value = true;
  const contentHTML = quillInstance?.root.innerHTML || '';
  const excerpt = form.value.excerpt.trim() || quillInstance?.getText().trim().slice(0, 150) || '';

  const submitData = {
    ...form.value,
    content: contentHTML,
    excerpt: excerpt,
  };

  try {
    const url = isEditMode.value ? `${API_BASE_URL}/articles/${form.value.id}` : `${API_BASE_URL}/articles`;
    const method = isEditMode.value ? 'PUT' : 'POST';

    const response = await fetch(url, {
      method: method,
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(submitData),
    });

    if (!response.ok) throw new Error('提交失败');

    ElMessage.success(isEditMode.value ? '文章更新成功！' : '文章发布成功！');
    drawerVisible.value = false;
    fetchData(); // 刷新列表

  } catch (error) {
    ElMessage.error('提交文章失败！');
  } finally {
    isSubmitting.value = false;
  }
};

// --- 封面上传处理 ---
const handleCoverSuccess: UploadProps['onSuccess'] = (response) => {
  const ossUrl = response.data?.url;
  if (ossUrl) {
    form.value.cover = ossUrl;
    ElMessage.success('封面上传成功');
  } else {
    ElMessage.error('封面上传失败');
  }
};

const beforeCoverUpload: UploadProps['beforeUpload'] = (rawFile) => {
  const isLt5M = rawFile.size / 1024 / 1024 < 5;
  if (!isLt5M) {
    ElMessage.error('图片大小不能超过 5MB!');
  }
  return isLt5M;
};

const handleCoverError = () => {
  ElMessage.error('封面上传失败');
};

</script>

<style scoped>
/* 表格样式 */
.el-table .el-table__cell { vertical-align: middle; }
.el-table__header-wrapper th { background-color: #fafafa !important; font-weight: 600; color: #333; }
.action-buttons .el-button { margin-right: 8px; }
.content-preview { color: #666; line-height: 1.5; word-break: break-all; }
.content-full { min-height: 300px; padding: 20px; background-color: #f9fafb; border-radius: 8px; }
.el-dialog__title { font-size: 18px !important; font-weight: 600 !important; }

/* 分页器样式 */
.custom-pagination { justify-content: flex-end !important; }
.custom-pagination .el-pagination__total,
.custom-pagination .el-pagination__sizes,
.custom-pagination .el-pagination__jump { margin-right: 16px !important; }
.custom-pagination .el-pagination__jump .el-input { width: 60px !important; }

/* 抽屉内表单样式 */
.publish-form-container { padding: 0 20px; }
.form-group { margin-bottom: 24px; }
.form-label { display: block; margin-bottom: 8px; color: #333; font-size: 14px; font-weight: 600; }
.quill-editor { height: 350px; border-radius: 4px; border: 1px solid #dcdfe6; }
.cover-uploader .el-upload { border: 1px dashed #d9d9d9; border-radius: 6px; cursor: pointer; position: relative; overflow: hidden; }
.cover-uploader .el-upload:hover { border-color: #409EFF; }
.cover-uploader-icon { font-size: 28px; color: #8c939d; width: 178px; height: 178px; text-align: center; }
.cover-preview { width: 178px; height: 178px; display: block; object-fit: cover; }
</style>

