// import React from 'react';
import { type MetaFunction } from "@remix-run/node";
import { useLoaderData } from "@remix-run/react";
import { Card } from "~/components/ui/Card";
import { Button } from "~/components/ui/Button";

export const links = () => [
  { rel: "stylesheet", href: "/app/styles/index.css" }
];

export const meta: MetaFunction = () => {
  return [
    { title: "中国烟草AI合同及卷宗审核系统 - 首页" },
    { name: "description", content: "AI审核系统首页" }
  ];
};

// API 响应的类型定义
interface StatsData {
  totalFiles: number;
  reviewedFiles: number;
  pendingFiles: number;
  passRate: number;
}

interface RecentFile { 
  id: string;
  name: string;
  type: string;
  reviewStatus: string;
  updatedAt: string;
}

// interface LoaderData {
//   stats: StatsData;
//   recentFiles: RecentFile[];
// }


// 模拟数据，实际项目中应该从API获取
export async function loader() {
  try {
    // 实际项目中这里应该是 API 调用
    // const response = await fetch('/api/dashboard/stats');
    // const stats: StatsData = await response.json();
    
    // const filesResponse = await fetch('/api/files/recent');
    // const recentFiles: RecentFile[] = await filesResponse.json();
    
    // 模拟数据
    const stats = {
      totalFiles: 156,
      reviewedFiles: 124,
      pendingFiles: 32,
      passRate: 92.5
    } as StatsData;
    
    const recentFiles = [
      {
        id: "1",
        name: "2023年度烟草专卖零售许可证.pdf",
        type: "专卖许可证",
        reviewStatus: "pass",
        updatedAt: "2023-12-24 14:30"
      },
      {
        id: "2",
        name: "烟草制品购销合同(2023-12).docx",
        type: "合同文档",
        reviewStatus: "warning",
        updatedAt: "2023-12-23 09:15"
      },
      {
        id: "3",
        name: "专卖管理处罚决定书(2023-145).pdf",
        type: "行政处罚决定书",
        reviewStatus: "fail",
        updatedAt: "2023-12-22 16:45"
      },
      {
        id: "4",
        name: "2023年第四季度采购合同.docx",
        type: "合同文档",
        reviewStatus: "pass",
        updatedAt: "2023-12-20 11:20"
      },
      {
        id: "5",
        name: "广告宣传协议书.pdf",
        type: "合同文档",
        reviewStatus: "pass",
        updatedAt: "2023-12-18 15:30"
      }
    ] as RecentFile[];

    return Response.json({ stats, recentFiles });
  } catch (error) {
    // 错误处理
    console.error('Failed to fetch dashboard data:', error);
    return Response.json(
      { error: '获取数据失败，请稍后重试' },
      { status: 500 }
    );
  }
}

export default function Index() {
  const { stats, recentFiles } = useLoaderData<typeof loader>();
  
  return (
    <div className="dashboard-container">
      {/* 页面标识 */}
      <div className="mb-4 p-3 bg-yellow-100 border border-yellow-300 rounded text-yellow-800">
        <h3 className="font-bold text-lg">当前页面: 首页 (_index.tsx)</h3>
        <p>如果你看到这个提示，说明你正在浏览首页，而不是评查点列表页面。</p>
        <div className="mt-2">
          <a href="/debug" className="text-blue-600 hover:underline">查看路由诊断页面</a> | 
          <a href="/rules" className="ml-2 text-blue-600 hover:underline">通过原生链接访问评查点列表</a>
        </div>
      </div>

      {/* 统计卡片区域 */}
      <Card title="统计信息" icon="ri-bar-chart-line" className="mt-6 transition-all duration-200 hover:shadow-[0_4px_15px_rgba(0,0,0,0.1)]">
        <div className="stat-grid ">
          <StatCard 
            title="总文件数" 
          value={stats.totalFiles}
          icon="ri-file-list-3-line"
        />
        <StatCard 
          title="已审核" 
          value={stats.reviewedFiles}
          icon="ri-check-double-line"
          trend={{ value: 5.2, isUp: true }}
        />
        <StatCard 
          title="待审核" 
          value={stats.pendingFiles}
          icon="ri-time-line"
          trend={{ value: 2.1, isUp: false }}
        />
        <StatCard 
          title="通过率" 
          value={`${stats.passRate}%`}
          icon="ri-pie-chart-line"
          trend={{ value: 1.5, isUp: true }}
        />
        </div>
      </Card>
      
      {/* 快捷访问区域 */}
      <Card title="快捷访问" icon="ri-speed-line" className="mt-6 transition-all duration-200 hover:shadow-[0_4px_15px_rgba(0,0,0,0.1)]">
        <div className="shortcut-grid">
          <ShortcutItem icon="ri-upload-cloud-line" label="上传文件" to="/files/new" />
          <ShortcutItem icon="ri-file-list-3-line" label="文件列表" to="/files" />
          <ShortcutItem icon="ri-list-check-2" label="评查点管理" to="/rules" />
          <ShortcutItem icon="ri-folder-open-line" label="评查点分组" to="/rule-groups" />
          <ShortcutItem icon="ri-file-chart-line" label="评查详情" to="/reviews" />
          <ShortcutItem icon="ri-file-list-line" label="文档类型" to="/doc-types" />
          <ShortcutItem icon="ri-settings-3-line" label="系统设置" to="/settings" />
          <ShortcutItem icon="ri-chat-1-line" label="提示词管理" to="/prompts" />
        </div>
      </Card>
      
      {/* 最近文档区域 */}
      <Card 
        title="最近文档" 
        icon="ri-file-list-3-line" 
        extra={<Button to="/files" size="small">查看全部</Button>}
        className="mt-6"
      >
        <div className="doc-list">
          {recentFiles.map((file: RecentFile) => (
            <div key={file.id} className="doc-item">
              <div className="doc-info">
                <i className={`doc-icon ${file.name.endsWith('.pdf') ? 'ri-file-pdf-line' : 'ri-file-word-line'}`}></i>
                <div>
                  <div className="doc-name">{file.name}</div>
                  <div className="doc-meta">
                    {file.type} · {file.updatedAt}
                  </div>
                </div>
              </div>
              <div className="doc-status">
                <StatusBadge status={file.reviewStatus} />
              </div>
            </div>
          ))}
        </div>
      </Card>
    </div>
  );
}

// 统计卡片组件
interface StatCardProps {
  title: string;
  value: number | string;
  icon: string;
  trend?: {
    value: number;
    isUp: boolean;
  };
}

function StatCard({ title, value, icon, trend }: StatCardProps) {
  return (
    <div className="stat-card">
      <div className="stat-title">{title}</div>
      <div className="stat-value">{value}</div>
      {trend && (
        <div className={`stat-trend ${trend.isUp ? 'trend-up' : 'trend-down'}`}>
          <i className={`mr-1 ${trend.isUp ? 'ri-arrow-up-s-line' : 'ri-arrow-down-s-line'}`}></i>
          <span>{trend.value}%</span>
          <span className="ml-1 text-gray-500">较上月</span>
        </div>
      )}
      <i className={`${icon} stat-icon`}></i>
    </div>
  );
}

// 快捷方式组件
interface ShortcutItemProps {
  icon: string;
  label: string;
  to: string;
}

function ShortcutItem({ icon, label, to }: ShortcutItemProps) {
  return (
    <Button 
      to={to} 
      type="default" 
      className="shortcut-item"
    >
      <i className={`${icon} shortcut-icon text-2xl`}></i>
      <span className="shortcut-label">{label}</span>
    </Button>
  );
}

// 状态标签组件
interface StatusBadgeProps {
  status: string;
}

function StatusBadge({ status }: StatusBadgeProps) {
  const statusMap: Record<string, { label: string, className: string, icon: string }> = {
    pass: { 
      label: '通过', 
      className: 'status-badge status-success', 
      icon: 'ri-checkbox-circle-line' 
    },
    warning: { 
      label: '警告', 
      className: 'status-badge status-warning', 
      icon: 'ri-error-warning-line' 
    },
    fail: { 
      label: '不通过', 
      className: 'status-badge status-error', 
      icon: 'ri-close-circle-line' 
    },
    pending: { 
      label: '待确认', 
      className: 'status-badge', 
      icon: 'ri-time-line' 
    }
  };
  
  const { label, className, icon } = statusMap[status] || statusMap.pending;
  
  return (
    <span className={className}>
      <i className={`${icon} mr-1`}></i>
      {label}
    </span>
  );
} 