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import React, { useState, useEffect } from 'react';
import { BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, Legend, ResponsiveContainer, PieChart, Pie, Cell } from 'recharts';
import { Loader2, TrendingUp, Brain, Cpu, MessageSquare } from 'lucide-react';
import { Link } from 'react-router-dom';
import api from '../services/api';

interface AlgorithmStat {
  algorithm: string;
  name: string;
  count: number;
}

interface DashboardStats {
  classical_ml: AlgorithmStat[];
  deep_learning: AlgorithmStat[];
  llms: AlgorithmStat[];
}

const Dashboard: React.FC = () => {
  const [stats, setStats] = useState<DashboardStats | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    fetchDashboardStats();
  }, []);

  const fetchDashboardStats = async () => {
    try {
      setLoading(true);
      const response = await api.get('/search/dashboard-stats');
      setStats(response.data);
    } catch (err) {
      setError('Failed to load dashboard statistics');
    } finally {
      setLoading(false);
    }
  };

  if (loading) {
    return (
      <div className="flex justify-center items-center h-64">
        <Loader2 className="h-8 w-8 animate-spin text-blue-600" />
        <span className="ml-2 text-gray-600">Loading dashboard...</span>
      </div>
    );
  }

  if (error) {
    return (
      <div className="text-center text-red-600 p-8">
        <p>{error}</p>
        <button 
          onClick={fetchDashboardStats}
          className="mt-4 px-4 py-2 bg-blue-600 text-white rounded hover:bg-blue-700"
        >
          Retry
        </button>
      </div>
    );
  }

  if (!stats) return null;

  const combinedData = [
    ...stats.classical_ml.map(item => ({ ...item, category: 'Classical ML' })),
    ...stats.deep_learning.map(item => ({ ...item, category: 'Deep Learning' })),
    ...stats.llms.map(item => ({ ...item, category: 'LLMs' }))
  ].sort((a, b) => b.count - a.count).slice(0, 12);

  const categoryTotals = [
    {
      name: 'Classical ML',
      value: stats.classical_ml.reduce((sum, item) => sum + item.count, 0),
      color: '#3B82F6'
    },
    {
      name: 'Deep Learning', 
      value: stats.deep_learning.reduce((sum, item) => sum + item.count, 0),
      color: '#8B5CF6'
    },
    {
      name: 'LLMs',
      value: stats.llms.reduce((sum, item) => sum + item.count, 0),
      color: '#10B981'
    }
  ];

  const totalPapers = categoryTotals.reduce((sum, cat) => sum + cat.value, 0);

  return (
    <div className="space-y-8">
      <div className="text-center">
        <h1 className="text-4xl font-bold text-gray-900 mb-2">
          AI Algorithms in Medical Research
        </h1>
        <p className="text-xl text-gray-600">
          Explore the landscape of AI algorithms used in PubMed medical papers
        </p>
      </div>

      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6">
        <div className="bg-white p-6 rounded-lg shadow-lg">
          <div className="flex items-center">
            <TrendingUp className="h-8 w-8 text-blue-600" />
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-600">Total Papers</p>
              <p className="text-2xl font-bold text-gray-900">{totalPapers.toLocaleString()}</p>
            </div>
          </div>
        </div>

        <div className="bg-white p-6 rounded-lg shadow-lg">
          <div className="flex items-center">
            <Brain className="h-8 w-8 text-blue-600" />
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-600">Classical ML Papers</p>
              <p className="text-2xl font-bold text-gray-900">{categoryTotals[0].value.toLocaleString()}</p>
            </div>
          </div>
        </div>

        <div className="bg-white p-6 rounded-lg shadow-lg">
          <div className="flex items-center">
            <Cpu className="h-8 w-8 text-purple-600" />
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-600">Deep Learning Papers</p>
              <p className="text-2xl font-bold text-gray-900">{categoryTotals[1].value.toLocaleString()}</p>
            </div>
          </div>
        </div>

        <div className="bg-white p-6 rounded-lg shadow-lg">
          <div className="flex items-center">
            <MessageSquare className="h-8 w-8 text-green-600" />
            <div className="ml-4">
              <p className="text-sm font-medium text-gray-600">LLMs Papers</p>
              <p className="text-2xl font-bold text-gray-900">{categoryTotals[2].value.toLocaleString()}</p>
            </div>
          </div>
        </div>
      </div>

      <div className="grid grid-cols-1 lg:grid-cols-2 gap-8">
        <div className="bg-white p-6 rounded-lg shadow-lg">
          <h2 className="text-xl font-bold text-gray-900 mb-4">Algorithm Distribution</h2>
          <ResponsiveContainer width="100%" height={300}>
            <PieChart>
              <Pie
                data={categoryTotals}
                cx="50%"
                cy="50%"
                labelLine={false}
                label={({ name, percent }) => `${name} ${(percent * 100).toFixed(1)}%`}
                outerRadius={80}
                fill="#8884d8"
                dataKey="value"
              >
                {categoryTotals.map((entry, index) => (
                  <Cell key={`cell-${index}`} fill={entry.color} />
                ))}
              </Pie>
              <Tooltip />
            </PieChart>
          </ResponsiveContainer>
        </div>

        <div className="bg-white p-6 rounded-lg shadow-lg">
          <h2 className="text-xl font-bold text-gray-900 mb-4">Top Algorithms by Usage</h2>
          <ResponsiveContainer width="100%" height={300}>
            <BarChart data={combinedData}>
              <CartesianGrid strokeDasharray="3 3" />
              <XAxis 
                dataKey="name" 
                angle={-45}
                textAnchor="end"
                height={80}
                fontSize={12}
              />
              <YAxis />
              <Tooltip />
              <Legend />
              <Bar 
                dataKey="count" 
                fill="#3B82F6"
                name="Paper Count"
              />
            </BarChart>
          </ResponsiveContainer>
        </div>
      </div>

      <div className="grid grid-cols-1 lg:grid-cols-3 gap-8">
        <div className="bg-white p-6 rounded-lg shadow-lg">
          <h2 className="text-xl font-bold text-gray-900 mb-4">Classical ML Algorithms</h2>
          <div className="space-y-3">
            {stats.classical_ml.slice(0, 8).map((algo, index) => (
              <div key={algo.algorithm} className="flex justify-between items-center p-3 bg-gray-50 rounded">
                <div>
                  <Link 
                    to={`/algorithm/${algo.algorithm}`}
                    className="font-medium text-gray-900 hover:text-blue-600 transition-colors"
                  >
                    {algo.name}
                  </Link>
                </div>
                <span className="text-blue-600 font-bold">{algo.count.toLocaleString()}</span>
              </div>
            ))}
          </div>
        </div>

        <div className="bg-white p-6 rounded-lg shadow-lg">
          <h2 className="text-xl font-bold text-gray-900 mb-4">Deep Learning Algorithms</h2>
          <div className="space-y-3">
            {stats.deep_learning.slice(0, 8).map((algo, index) => (
              <div key={algo.algorithm} className="flex justify-between items-center p-3 bg-gray-50 rounded">
                <div>
                  <Link 
                    to={`/algorithm/${algo.algorithm}`}
                    className="font-medium text-gray-900 hover:text-purple-600 transition-colors"
                  >
                    {algo.name}
                  </Link>
                </div>
                <span className="text-purple-600 font-bold">{algo.count.toLocaleString()}</span>
              </div>
            ))}
          </div>
        </div>

        <div className="bg-white p-6 rounded-lg shadow-lg">
          <h2 className="text-xl font-bold text-gray-900 mb-4">Large Language Models</h2>
          <div className="space-y-3">
            {stats.llms.slice(0, 8).map((algo, index) => (
              <div key={algo.algorithm} className="flex justify-between items-center p-3 bg-gray-50 rounded">
                <div>
                  <Link 
                    to={`/algorithm/${algo.algorithm}`}
                    className="font-medium text-gray-900 hover:text-green-600 transition-colors"
                  >
                    {algo.name}
                  </Link>
                </div>
                <span className="text-green-600 font-bold">{algo.count.toLocaleString()}</span>
              </div>
            ))}
          </div>
        </div>
      </div>
    </div>
  );
};

export default Dashboard;