import { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import {
  Table,
  Button,
  Space,
  Input,
  Select,
  Tag,
  Tabs,
  Popconfirm,
  message,
  Modal,
  Form,
} from 'antd';
import {
  PlusOutlined,
  EditOutlined,
  DeleteOutlined,
  SendOutlined,
  CheckOutlined,
  CloseOutlined,
  RollbackOutlined,
  EyeOutlined,
} from '@ant-design/icons';
import {
  articleApi,
  articleCategoryApi,
  type ArticleListItem,
  type ArticleStatus,
  type ArticleTagItem,
} from '../../api/health/articles';
import { AuthButton } from '../../components/AuthButton';
import { PageContainer } from '../../components/PageContainer';
import { usePaginatedData } from '../../hooks/usePaginatedData';
import { formatDateTime } from '../../utils/format';

// --- 常量 ---

const STATUS_TABS: { key: string; label: string }[] = [
  { key: '', label: '全部' },
  { key: 'draft', label: '草稿' },
  { key: 'pending_review', label: '待审核' },
  { key: 'published', label: '已发布' },
  { key: 'rejected', label: '已拒绝' },
];

const STATUS_CONFIG: Record<string, { label: string; color: string }> = {
  draft: { label: '草稿', color: 'default' },
  pending_review: { label: '待审核', color: 'processing' },
  published: { label: '已发布', color: 'success' },
  rejected: { label: '已拒绝', color: 'error' },
};

// --- 筛选器 ---

interface ArticleFilters {
  keyword: string;
  status: string;
  category_id: string;
}

const DEFAULT_FILTERS: ArticleFilters = {
  keyword: '',
  status: '',
  category_id: '',
};

export default function ArticleManageList() {
  const navigate = useNavigate();
  const [categories, setCategories] = useState<{ id: string; name: string }[]>([]);
  const [rejectModalOpen, setRejectModalOpen] = useState(false);
  const [rejectingArticle, setRejectingArticle] = useState<ArticleListItem | null>(null);
  const [rejectForm] = Form.useForm();

  // ---- 分页数据 Hook ----
  const {
    data,
    total,
    page,
    loading,
    filters,
    setFilters,
    refresh,
  } = usePaginatedData<ArticleListItem, ArticleFilters>(
    async (p, pageSize, f) => {
      const result = await articleApi.list({
        page: p,
        page_size: pageSize,
        status: (f.status || undefined) as ArticleStatus | undefined,
        category_id: f.category_id || undefined,
        keyword: f.keyword || undefined,
      });
      return result;
    },
    { pageSize: 20, defaultFilters: { ...DEFAULT_FILTERS } },
  );

  // ---- 分类列表 ----
  useEffect(() => {
    articleCategoryApi.list()
      .then((cats) => setCategories(cats.map((c) => ({ id: c.id, name: c.name }))))
      .catch(() => {});
  }, []);

  // ---- 操作 ----

  const handleDelete = async (id: string) => {
    try {
      await articleApi.delete(id);
      message.success('文章已删除');
      refresh();
    } catch {
      message.error('删除失败');
    }
  };

  const handleSubmit = async (record: ArticleListItem) => {
    try {
      await articleApi.submit(record.id, record.version);
      message.success('已提交审核');
      refresh();
    } catch {
      message.error('提交审核失败');
    }
  };

  const handleApprove = async (record: ArticleListItem) => {
    try {
      await articleApi.approve(record.id, record.version);
      message.success('审核通过，文章已发布');
      refresh();
    } catch {
      message.error('审核操作失败');
    }
  };

  const openRejectModal = (record: ArticleListItem) => {
    setRejectingArticle(record);
    rejectForm.resetFields();
    setRejectModalOpen(true);
  };

  const handleReject = async (values: { review_note: string }) => {
    if (!rejectingArticle) return;
    try {
      await articleApi.reject(rejectingArticle.id, rejectingArticle.version, values.review_note);
      message.success('已拒绝文章');
      setRejectModalOpen(false);
      refresh();
    } catch {
      message.error('拒绝操作失败');
    }
  };

  const handleUnpublish = async (record: ArticleListItem) => {
    try {
      await articleApi.unpublish(record.id, record.version);
      message.success('文章已撤回为草稿');
      refresh();
    } catch {
      message.error('撤回操作失败');
    }
  };

  const renderActions = (record: ArticleListItem) => (
    <Space size={4} wrap>
      {record.status === 'draft' && (
        <>
          <AuthButton code="health.articles.manage">
            <Button
              size="small"
              type="text"
              icon={<EditOutlined />}
              onClick={() => navigate(`/health/articles/${record.id}/edit`)}
            >
              编辑
            </Button>
          </AuthButton>
          <AuthButton code="health.articles.manage">
            <Button
              size="small"
              type="text"
              icon={<SendOutlined />}
              onClick={() => handleSubmit(record)}
            >
              提交审核
            </Button>
          </AuthButton>
        </>
      )}
      {record.status === 'pending_review' && (
        <>
          <AuthButton code="health.articles.review">
            <Button
              size="small"
              type="text"
              icon={<CheckOutlined />}
              style={{ color: '#059669' }}
              onClick={() => handleApprove(record)}
            >
              通过
            </Button>
          </AuthButton>
          <AuthButton code="health.articles.review">
            <Button
              size="small"
              type="text"
              icon={<CloseOutlined />}
              danger
              onClick={() => openRejectModal(record)}
            >
              拒绝
            </Button>
          </AuthButton>
        </>
      )}
      {record.status === 'published' && (
        <AuthButton code="health.articles.manage">
          <Button
            size="small"
            type="text"
            icon={<RollbackOutlined />}
            onClick={() => handleUnpublish(record)}
          >
            撤回
          </Button>
        </AuthButton>
      )}
      {(record.status === 'draft' || record.status === 'rejected') && (
        <AuthButton code="health.articles.manage">
          <Popconfirm
            title="确定删除此文章？"
            onConfirm={() => handleDelete(record.id)}
          >
            <Button size="small" type="text" icon={<DeleteOutlined />} danger />
          </Popconfirm>
        </AuthButton>
      )}
    </Space>
  );

  // ---- 列定义 ----

  const columns = [
    {
      title: '标题',
      dataIndex: 'title',
      key: 'title',
      ellipsis: true,
      render: (title: string, record: ArticleListItem) => (
        <div style={{ display: 'flex', alignItems: 'center', gap: 10 }}>
          {record.cover_image && (
            <div
              style={{
                width: 40,
                height: 40,
                borderRadius: 6,
                background: `url(${record.cover_image}) center/cover`,
                flexShrink: 0,
              }}
            />
          )}
          <div style={{ minWidth: 0 }}>
            <div
              style={{ fontWeight: 500, fontSize: 14, cursor: 'pointer' }}
              onClick={() => navigate(`/health/articles/${record.id}/edit`)}
            >
              {title}
            </div>
            {record.summary && (
              <div
                style={{
                  fontSize: 12,
                  color: 'var(--ant-color-text-secondary, #94a3b8)',
                  overflow: 'hidden',
                  textOverflow: 'ellipsis',
                  whiteSpace: 'nowrap',
                  maxWidth: 300,
                }}
              >
                {record.summary}
              </div>
            )}
          </div>
        </div>
      ),
    },
    {
      title: '分类',
      dataIndex: 'category_name',
      key: 'category_name',
      width: 120,
      render: (v?: string) => v || <span style={{ color: 'var(--ant-color-text-quaternary, #cbd5e1)' }}>未分类</span>,
    },
    {
      title: '标签',
      dataIndex: 'tags',
      key: 'tags',
      width: 180,
      render: (tags?: ArticleTagItem[]) => {
        if (!tags || tags.length === 0) return '-';
        return (
          <Space size={4} wrap>
            {tags.map((t) => (
              <Tag key={t.id}>{t.name}</Tag>
            ))}
          </Space>
        );
      },
    },
    {
      title: '状态',
      dataIndex: 'status',
      key: 'status',
      width: 100,
      render: (status: string) => {
        const config = STATUS_CONFIG[status] || { label: status, color: 'default' };
        return <Tag color={config.color}>{config.label}</Tag>;
      },
    },
    {
      title: '作者',
      dataIndex: 'author',
      key: 'author',
      width: 100,
      render: (v?: string) => v || '-',
    },
    {
      title: '阅读数',
      dataIndex: 'view_count',
      key: 'view_count',
      width: 80,
      render: (v: number) => (
        <span style={{ display: 'flex', alignItems: 'center', gap: 4 }}>
          <EyeOutlined style={{ fontSize: 12 }} />
          {v ?? 0}
        </span>
      ),
    },
    {
      title: '发布时间',
      dataIndex: 'published_at',
      key: 'published_at',
      width: 170,
      render: (v: string) => (v ? formatDateTime(v) : '-'),
    },
    {
      title: '操作',
      key: 'actions',
      width: 200,
      render: (_: unknown, record: ArticleListItem) => renderActions(record),
    },
  ];

  return (
    <PageContainer
      title="内容管理"
      subtitle="管理健康科普文章、资讯和内容发布"
      filters={
        <>
          <Input
            placeholder="搜索文章标题..."
            value={filters.keyword}
            onChange={(e) => {
              setFilters((prev) => ({ ...prev, keyword: e.target.value }));
            }}
            allowClear
            style={{ width: 220 }}
          />
          <Select
            value={filters.category_id || undefined}
            onChange={(v) => {
              setFilters((prev) => ({ ...prev, category_id: v ?? '' }));
              refresh(1);
            }}
            placeholder="选择分类"
            allowClear
            style={{ width: 160 }}
            options={categories.map((c) => ({ label: c.name, value: c.id }))}
          />
        </>
      }
      onResetFilters={() => {
        setFilters({ ...DEFAULT_FILTERS });
        refresh(1);
      }}
      actions={
        <AuthButton code="health.articles.manage">
          <Button
            type="primary"
            icon={<PlusOutlined />}
            onClick={() => navigate('/health/articles/new')}
          >
            新建文章
          </Button>
        </AuthButton>
      }
      loading={loading}
    >
      <Tabs
        activeKey={filters.status}
        onChange={(key) => {
          setFilters((prev) => ({ ...prev, status: key }));
          refresh(1);
        }}
        items={STATUS_TABS.map((tab) => ({ key: tab.key, label: tab.label }))}
        style={{ marginBottom: 0 }}
      />
      <Table
        rowKey="id"
        columns={columns}
        dataSource={data}
        loading={loading}
        onChange={(pagination) => refresh(pagination.current ?? 1)}
        pagination={{
          current: page,
          pageSize: 20,
          total,
          showTotal: (t) => `共 ${t} 条记录`,
        }}
      />

      {/* 拒绝理由弹窗 */}
      <Modal
        title="拒绝文章"
        open={rejectModalOpen}
        onCancel={() => setRejectModalOpen(false)}
        onOk={() => rejectForm.submit()}
        okText="确认拒绝"
        okButtonProps={{ danger: true }}
        width={480}
      >
        <Form
          form={rejectForm}
          onFinish={handleReject}
          layout="vertical"
          style={{ marginTop: 16 }}
        >
          <Form.Item
            name="review_note"
            label="拒绝理由"
            rules={[{ required: true, message: '请输入拒绝理由' }]}
          >
            <Input.TextArea rows={3} placeholder="请输入拒绝理由" />
          </Form.Item>
        </Form>
      </Modal>
    </PageContainer>
  );
}