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import React, { useState, useEffect } from 'react';
import { Card, CardHeader, CardTitle, CardContent } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from 'recharts';
import { Upload, RefreshCw, Users, BarChart2, ThumbsUp, Database } from 'lucide-react';
import { Alert, AlertDescription } from '@/components/ui/alert';

const AdminDashboard = () => {
  const [stats, setStats] = useState({
    accuracy: 95.5,
    interactions: 1234,
    satisfaction: 98,
    lastUpdate: new Date().toLocaleString(),
    averageResponseTime: 0.5,
    totalQuestions: 3500
  });

  const [learningData, setLearningData] = useState([
    { date: '2024-01', accuracy: 90 },
    { date: '2024-02', accuracy: 92 },
    { date: '2024-03', accuracy: 94 },
    { date: '2024-04', accuracy: 95.5 }
  ]);

  const [isUpdating, setIsUpdating] = useState(false);
  const [updateStatus, setUpdateStatus] = useState(null);

  const updateKnowledgeBase = async () => {
    setIsUpdating(true);
    setUpdateStatus('درحال به‌روزرسانی پایگاه دانش...');
    
    try {
      // ارسال درخواست به‌روزرسانی به سرور
      const response = await fetch('/api/update-knowledge-base', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        }
      });

      if (response.ok) {
        setUpdateStatus('به‌روزرسانی با موفقیت انجام شد');
        setStats(prev => ({
          ...prev,
          lastUpdate: new Date().toLocaleString()
        }));
      } else {
        throw new Error('خطا در به‌روزرسانی');
      }
    } catch (error) {
      setUpdateStatus('خطا در به‌روزرسانی پایگاه دانش');
    } finally {
      setIsUpdating(false);
      // پاک کردن پیام وضعیت بعد از 3 ثانیه
      setTimeout(() => setUpdateStatus(null), 3000);
    }
  };

  const handleFileUpload = async (event) => {
    const file = event.target.files[0];
    if (!file) return;

    const formData = new FormData();
    formData.append('file', file);

    try {
      const response = await fetch('/api/upload-document', {
        method: 'POST',
        body: formData
      });

      if (response.ok) {
        setUpdateStatus('فایل با موفقیت آپلود شد');
      } else {
        throw new Error('خطا در آپلود فایل');
      }
    } catch (error) {
      setUpdateStatus('خطا در آپلود فایل');
    }
  };

  return (
    <div className="min-h-screen bg-gradient-to-br from-gray-50 to-gray-100 p-8 rtl">
      <div className="max-w-6xl mx-auto space-y-8">
        {/* Header */}
        <div className="text-center">
          <h1 className="text-4xl font-bold text-gray-800 mb-4">پنل مدیریت</h1>
          <p className="text-gray-600">آخرین به‌روزرسانی: {stats.lastUpdate}</p>
        </div>

        {/* Status Alert */}
        {updateStatus && (
          <Alert className="bg-white/30 backdrop-blur-lg">
            <AlertDescription>{updateStatus}</AlertDescription>
          </Alert>
        )}

        {/* Stats Cards */}
        <div className="grid md:grid-cols-3 gap-6">
          {/* Response Time Card */}
          <div className="bg-white/30 backdrop-blur-lg rounded-2xl p-6 shadow-[5px_5px_20px_rgba(0,0,0,0.1),-5px_-5px_20px_rgba(255,255,255,0.8)] transition-all duration-300 hover:shadow-[8px_8px_25px_rgba(0,0,0,0.12),-8px_-8px_25px_rgba(255,255,255,0.9)] hover:transform hover:-translate-y-1">
            <div className="flex items-center justify-between">
              <BarChart2 className="text-blue-500" size={24} />
              <h3 className="text-lg font-semibold text-gray-700">زمان پاسخ‌دهی</h3>
            </div>
            <p className="text-3xl font-bold text-blue-600 mt-4">{stats.averageResponseTime}s</p>
          </div>

          {/* Questions Card */}
          <div className="bg-white/30 backdrop-blur-lg rounded-2xl p-6 shadow-[5px_5px_20px_rgba(0,0,0,0.1),-5px_-5px_20px_rgba(255,255,255,0.8)] transition-all duration-300 hover:shadow-[8px_8px_25px_rgba(0,0,0,0.12),-8px_-8px_25px_rgba(255,255,255,0.9)] hover:transform hover:-translate-y-1">
            <div className="flex items-center justify-between">
              <Users className="text-green-500" size={24} />
              <h3 className="text-lg font-semibold text-gray-700">تعداد سوالات</h3>
            </div>
            <p className="text-3xl font-bold text-green-600 mt-4">{stats.totalQuestions}</p>
          </div>

          {/* Accuracy Card */}
          <div className="bg-white/30 backdrop-blur-lg rounded-2xl p-6 shadow-[5px_5px_20px_rgba(0,0,0,0.1),-5px_-5px_20px_rgba(255,255,255,0.8)] transition-all duration-300 hover:shadow-[8px_8px_25px_rgba(0,0,0,0.12),-8px_-8px_25px_rgba(255,255,255,0.9)] hover:transform hover:-translate-y-1">
            <div className="flex items-center justify-between">
              <ThumbsUp className="text-purple-500" size={24} />
              <h3 className="text-lg font-semibold text-gray-700">دقت پاسخ‌گویی</h3>
            </div>
            <p className="text-3xl font-bold text-purple-600 mt-4">{stats.accuracy}%</p>
          </div>
        </div>

        {/* Chart Section */}
        <Card className="bg-white/30 backdrop-blur-lg rounded-2xl p-6 shadow-[5px_5px_20px_rgba(0,0,0,0.1),-5px_-5px_20px_rgba(255,255,255,0.8)]">
          <CardHeader>
            <CardTitle>روند یادگیری</CardTitle>
          </CardHeader>
          <CardContent>
            <div className="h-64">
              <ResponsiveContainer width="100%" height="100%">
                <LineChart data={learningData}>
                  <CartesianGrid strokeDasharray="3 3" />
                  <XAxis dataKey="date" />
                  <YAxis domain={[80, 100]} />
                  <Tooltip />
                  <Line 
                    type="monotone" 
                    dataKey="accuracy" 
                    stroke="#4F46E5" 
                    strokeWidth={2}
                    dot={{ fill: '#4F46E5' }}
                  />
                </LineChart>
              </ResponsiveContainer>
            </div>
          </CardContent>
        </Card>

        {/* Actions Section */}
        <div className="grid md:grid-cols-2 gap-6">
          {/* Update Knowledge Base Button */}
          <Button 
            onClick={updateKnowledgeBase}
            disabled={isUpdating}
            className="bg-gradient-to-r from-blue-500 to-indigo-600 text-white rounded-xl p-4 flex items-center justify-center gap-2 shadow-[5px_5px_20px_rgba(0,0,0,0.1)] transition-all duration-300 hover:shadow-[8px_8px_25px_rgba(0,0,0,0.12)] hover:transform hover:-translate-y-1"
          >
            <Database className={`w-5 h-5 ${isUpdating ? 'animate-spin' : ''}`} />
            {isUpdating ? 'در حال به‌روزرسانی...' : 'به‌روزرسانی پایگاه دانش'}
          </Button>

          {/* File Upload Section */}
          <div className="bg-white/30 backdrop-blur-lg rounded-2xl p-6 shadow-[5px_5px_20px_rgba(0,0,0,0.1),-5px_-5px_20px_rgba(255,255,255,0.8)]">
            <div className="flex items-center justify-center w-full">
              <label className="flex flex-col items-center justify-center w-full h-32 border-2 border-dashed rounded-xl border-gray-300 cursor-pointer bg-white/50 hover:bg-white/70 transition-all duration-300">
                <div className="flex flex-col items-center justify-center pt-5 pb-6">
                  <Upload className="w-8 h-8 text-gray-500 mb-2" />
                  <p className="text-sm text-gray-500">برای آپلود فایل کلیک کنید</p>
                </div>
                <input 
                  type="file" 
                  className="hidden"
                  onChange={handleFileUpload}
                  accept=".txt,.pdf,.docx"
                />
              </label>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
};

export default AdminDashboard;