import { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import {
  Settings,
  Target,
  Sliders,
  AlertTriangle,
  Cpu,
  Box,
  Layers,
  Play,
  Download,
  RefreshCw,
  ChevronDown,
  ChevronUp,
  ArrowUp,
  ArrowDown,
  CheckCircle,
  Info,
  FileBox,
  FolderOpen,
  File,
  Layout,
  Grid3X3
} from 'lucide-react';
import { useStudy } from '../context/StudyContext';
import { Card } from '../components/common/Card';
import { Button } from '../components/common/Button';
import { apiClient, ModelFile } from '../api/client';
import { AtomizerCanvas } from '../components/canvas/AtomizerCanvas';
import { ConfigImporter } from '../components/canvas/panels/ConfigImporter';
import { useCanvasStore } from '../hooks/useCanvasStore';

interface StudyConfig {
  study_name: string;
  description?: string;
  objectives: {
    name: string;
    direction: 'minimize' | 'maximize';
    unit?: string;
    target?: number;
    weight?: number;
  }[];
  design_variables: {
    name: string;
    type: 'float' | 'int' | 'categorical';
    low?: number;
    high?: number;
    step?: number;
    choices?: string[];
    unit?: string;
  }[];
  constraints: {
    name: string;
    type: 'le' | 'ge' | 'eq';
    bound: number;
    unit?: string;
  }[];
  algorithm: {
    name: string;
    sampler: string;
    pruner?: string;
    n_trials: number;
    timeout?: number;
  };
  fea_model?: {
    software: string;
    solver: string;
    sim_file?: string;
    mesh_elements?: number;
  };
  extractors?: {
    name: string;
    type: string;
    source?: string;
  }[];
}

type TabType = 'config' | 'canvas';

export default function Setup() {
  const navigate = useNavigate();
  const { selectedStudy, isInitialized } = useStudy();
  const [activeTab, setActiveTab] = useState<TabType>('config');
  const [config, setConfig] = useState<StudyConfig | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [expandedSections, setExpandedSections] = useState<Set<string>>(
    new Set(['objectives', 'variables', 'constraints', 'algorithm', 'modelFiles'])
  );
  const [modelFiles, setModelFiles] = useState<ModelFile[]>([]);
  const [modelDir, setModelDir] = useState<string>('');
  const [showImporter, setShowImporter] = useState(false);
  const [canvasNotification, setCanvasNotification] = useState<string | null>(null);
  const { nodes } = useCanvasStore();

  // Redirect if no study selected
  useEffect(() => {
    if (isInitialized && !selectedStudy) {
      navigate('/');
    }
  }, [selectedStudy, navigate, isInitialized]);

  // Load study configuration
  useEffect(() => {
    if (selectedStudy) {
      loadConfig();
      loadModelFiles();
    }
  }, [selectedStudy]);

  const loadModelFiles = async () => {
    if (!selectedStudy) return;
    try {
      const data = await apiClient.getModelFiles(selectedStudy.id);
      setModelFiles(data.files);
      setModelDir(data.model_dir);
    } catch (err) {
      console.error('Failed to load model files:', err);
    }
  };

  const handleOpenFolder = async () => {
    if (!selectedStudy) return;
    try {
      await apiClient.openFolder(selectedStudy.id, 'model');
    } catch (err: any) {
      setError(err.message || 'Failed to open folder');
    }
  };

  const loadConfig = async () => {
    if (!selectedStudy) return;
    setLoading(true);
    setError(null);

    try {
      const response = await apiClient.getStudyConfig(selectedStudy.id);
      const rawConfig = response.config;

      // Transform backend config format to our StudyConfig format
      const transformedConfig: StudyConfig = {
        study_name: rawConfig.study_name || selectedStudy.name || selectedStudy.id,
        description: rawConfig.description,
        objectives: (rawConfig.objectives || []).map((obj: any) => ({
          name: obj.name,
          direction: obj.direction || 'minimize',
          unit: obj.unit || obj.units,
          target: obj.target,
          weight: obj.weight
        })),
        design_variables: (rawConfig.design_variables || []).map((dv: any) => ({
          name: dv.name,
          type: dv.type || 'float',
          low: dv.min ?? dv.low,
          high: dv.max ?? dv.high,
          step: dv.step,
          choices: dv.choices,
          unit: dv.unit || dv.units
        })),
        constraints: (rawConfig.constraints || []).map((c: any) => ({
          name: c.name,
          type: c.type || 'le',
          bound: c.max_value ?? c.min_value ?? c.bound ?? 0,
          unit: c.unit || c.units
        })),
        algorithm: {
          name: rawConfig.optimizer?.name || rawConfig.algorithm?.name || 'Optuna',
          sampler: rawConfig.optimization?.algorithm || rawConfig.optimization_settings?.sampler || rawConfig.algorithm?.sampler || 'TPESampler',
          pruner: rawConfig.optimization_settings?.pruner || rawConfig.algorithm?.pruner,
          n_trials: rawConfig.optimization?.n_trials || rawConfig.optimization_settings?.n_trials || rawConfig.trials?.n_trials || selectedStudy.progress.total,
          timeout: rawConfig.optimization_settings?.timeout
        },
        fea_model: rawConfig.fea_model || rawConfig.solver ? {
          software: rawConfig.fea_model?.software || rawConfig.solver?.type || 'NX Nastran',
          solver: rawConfig.fea_model?.solver || rawConfig.solver?.name || 'SOL 103',
          sim_file: rawConfig.sim_file || rawConfig.fea_model?.sim_file,
          mesh_elements: rawConfig.fea_model?.mesh_elements
        } : undefined,
        extractors: rawConfig.extractors
      };

      setConfig(transformedConfig);
    } catch (err: any) {
      // If no config endpoint, create mock from available data
      setConfig({
        study_name: selectedStudy.name || selectedStudy.id,
        objectives: [{ name: 'objective', direction: 'minimize' }],
        design_variables: [],
        constraints: [],
        algorithm: {
          name: 'Optuna',
          sampler: 'TPESampler',
          n_trials: selectedStudy.progress.total
        }
      });
      setError('Configuration loaded with limited data');
    } finally {
      setLoading(false);
    }
  };

  const toggleSection = (section: string) => {
    setExpandedSections(prev => {
      const next = new Set(prev);
      if (next.has(section)) {
        next.delete(section);
      } else {
        next.add(section);
      }
      return next;
    });
  };

  const handleStartOptimization = async () => {
    if (!selectedStudy) return;
    try {
      await apiClient.startOptimization(selectedStudy.id);
      navigate('/dashboard');
    } catch (err: any) {
      setError(err.message || 'Failed to start optimization');
    }
  };

  const handleExportConfig = () => {
    if (!config) return;
    const blob = new Blob([JSON.stringify(config, null, 2)], { type: 'application/json' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = `${selectedStudy?.id || 'study'}_config.json`;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);
  };

  // Loading state
  if (!isInitialized) {
    return (
      <div className="flex items-center justify-center min-h-screen">
        <div className="text-center">
          <div className="animate-spin w-8 h-8 border-2 border-primary-500 border-t-transparent rounded-full mx-auto mb-4"></div>
          <p className="text-dark-400">Loading study...</p>
        </div>
      </div>
    );
  }

  if (!selectedStudy) return null;

  // Calculate design space size
  const designSpaceSize = config?.design_variables.reduce((acc, v) => {
    if (v.type === 'categorical' && v.choices) {
      return acc * v.choices.length;
    } else if (v.type === 'int' && v.low !== undefined && v.high !== undefined) {
      return acc * (v.high - v.low + 1);
    }
    return acc * 1000; // Approximate for continuous
  }, 1) || 0;

  // Canvas tab - full height and full width
  if (activeTab === 'canvas') {
    const handleImport = (source: string) => {
      setCanvasNotification(`Loaded: ${source}`);
      setTimeout(() => setCanvasNotification(null), 3000);
    };

    return (
      <div className="w-full h-[calc(100vh-6rem)] flex flex-col -mx-6 -my-6 px-4 pt-4">
        {/* Tab Bar */}
        <div className="flex items-center gap-2 mb-3 border-b border-dark-700 pb-3">
          <button
            onClick={() => setActiveTab('config')}
            className="flex items-center gap-2 px-4 py-2 rounded-lg transition-colors bg-dark-800 text-dark-300 hover:text-white hover:bg-dark-700"
          >
            <Layout className="w-4 h-4" />
            Configuration
          </button>
          <button
            onClick={() => navigate(`/canvas/${selectedStudy?.id || ''}`)}
            className="flex items-center gap-2 px-4 py-2 rounded-lg transition-colors bg-primary-600 text-white"
          >
            <Grid3X3 className="w-4 h-4" />
            Canvas Builder
          </button>
          <div className="flex-1" />
          {nodes.length === 0 && (
            <button
              onClick={() => setShowImporter(true)}
              className="flex items-center gap-2 px-3 py-1.5 rounded-lg bg-emerald-600 hover:bg-emerald-500 text-white text-sm transition-colors"
            >
              <Download className="w-4 h-4" />
              Load Study Config
            </button>
          )}
          <span className="text-dark-400 text-sm">
            {selectedStudy?.name || 'Study'}
          </span>
        </div>
        {/* Canvas - takes remaining height */}
        <div className="flex-1 min-h-0 rounded-lg overflow-hidden border border-dark-700">
          <AtomizerCanvas />
        </div>

        {/* Config Importer Modal */}
        <ConfigImporter
          isOpen={showImporter}
          onClose={() => setShowImporter(false)}
          onImport={handleImport}
          currentStudyId={selectedStudy?.id}
        />

        {/* Notification Toast */}
        {canvasNotification && (
          <div className="fixed bottom-4 left-1/2 transform -translate-x-1/2 px-4 py-2 bg-dark-800 text-white rounded-lg shadow-lg z-50 border border-dark-600">
            {canvasNotification}
          </div>
        )}
      </div>
    );
  }

  return (
    <div className="w-full">
      {/* Tab Bar */}
      <div className="flex items-center gap-2 mb-4">
        <button
          onClick={() => setActiveTab('config')}
          className="flex items-center gap-2 px-4 py-2 rounded-lg transition-colors bg-primary-600 text-white"
        >
          <Layout className="w-4 h-4" />
          Configuration
        </button>
        <button
          onClick={() => navigate(`/canvas/${selectedStudy?.id || ''}`)}
          className="flex items-center gap-2 px-4 py-2 rounded-lg transition-colors bg-dark-800 text-dark-300 hover:text-white hover:bg-dark-700"
        >
          <Grid3X3 className="w-4 h-4" />
          Canvas Builder
        </button>
      </div>

      {/* Header */}
      <header className="mb-6 flex items-center justify-between border-b border-dark-600 pb-4">
        <div>
          <div className="flex items-center gap-3">
            <Settings className="w-8 h-8 text-primary-400" />
            <div>
              <h1 className="text-2xl font-bold text-white">{config?.study_name || selectedStudy.name}</h1>
              <p className="text-dark-400 text-sm">Study Configuration</p>
            </div>
          </div>
          {config?.description && (
            <p className="text-dark-300 mt-2 max-w-2xl">{config.description}</p>
          )}
        </div>
        <div className="flex items-center gap-3">
          <Button
            variant="secondary"
            icon={<RefreshCw className="w-4 h-4" />}
            onClick={loadConfig}
            disabled={loading}
          >
            Refresh
          </Button>
          <Button
            variant="secondary"
            icon={<Download className="w-4 h-4" />}
            onClick={handleExportConfig}
            disabled={!config}
          >
            Export
          </Button>
          {selectedStudy.status === 'not_started' && (
            <Button
              variant="primary"
              icon={<Play className="w-4 h-4" />}
              onClick={handleStartOptimization}
            >
              Start Optimization
            </Button>
          )}
        </div>
      </header>

      {/* Error Message */}
      {error && (
        <div className="mb-4 p-3 bg-yellow-900/20 border border-yellow-800/30 rounded-lg">
          <div className="flex items-center gap-2 text-yellow-400 text-sm">
            <Info className="w-4 h-4" />
            <span>{error}</span>
          </div>
        </div>
      )}

      {loading ? (
        <div className="flex items-center justify-center py-16">
          <RefreshCw className="w-8 h-8 animate-spin text-dark-400" />
        </div>
      ) : (
        <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
          {/* Left Column */}
          <div className="space-y-6">
            {/* Objectives Panel */}
            <Card className="overflow-hidden">
              <button
                onClick={() => toggleSection('objectives')}
                className="w-full flex items-center justify-between p-4 hover:bg-dark-750 transition-colors"
              >
                <div className="flex items-center gap-3">
                  <Target className="w-5 h-5 text-primary-400" />
                  <h2 className="text-lg font-semibold text-white">Objectives</h2>
                  <span className="text-xs bg-dark-600 text-dark-300 px-2 py-0.5 rounded-full">
                    {config?.objectives.length || 0}
                  </span>
                </div>
                {expandedSections.has('objectives') ? (
                  <ChevronUp className="w-5 h-5 text-dark-400" />
                ) : (
                  <ChevronDown className="w-5 h-5 text-dark-400" />
                )}
              </button>

              {expandedSections.has('objectives') && (
                <div className="px-4 pb-4 space-y-3">
                  {config?.objectives.map((obj, idx) => (
                    <div
                      key={idx}
                      className="bg-dark-750 rounded-lg p-4 border border-dark-600"
                    >
                      <div className="flex items-center justify-between mb-2">
                        <span className="font-medium text-white">{obj.name}</span>
                        <span className={`flex items-center gap-1 text-sm px-2 py-1 rounded ${
                          obj.direction === 'minimize'
                            ? 'bg-green-500/10 text-green-400'
                            : 'bg-blue-500/10 text-blue-400'
                        }`}>
                          {obj.direction === 'minimize' ? (
                            <ArrowDown className="w-3 h-3" />
                          ) : (
                            <ArrowUp className="w-3 h-3" />
                          )}
                          {obj.direction}
                        </span>
                      </div>
                      <div className="flex items-center gap-4 text-sm text-dark-400">
                        {obj.unit && <span>Unit: {obj.unit}</span>}
                        {obj.target !== undefined && (
                          <span>Target: {obj.target}</span>
                        )}
                        {obj.weight !== undefined && (
                          <span>Weight: {obj.weight}</span>
                        )}
                      </div>
                    </div>
                  ))}
                  {config?.objectives.length === 0 && (
                    <p className="text-dark-500 text-sm italic">No objectives configured</p>
                  )}
                  <div className="text-xs text-dark-500 pt-2">
                    Type: {(config?.objectives.length || 0) > 1 ? 'Multi-Objective' : 'Single-Objective'}
                  </div>
                </div>
              )}
            </Card>

            {/* Design Variables Panel */}
            <Card className="overflow-hidden">
              <button
                onClick={() => toggleSection('variables')}
                className="w-full flex items-center justify-between p-4 hover:bg-dark-750 transition-colors"
              >
                <div className="flex items-center gap-3">
                  <Sliders className="w-5 h-5 text-primary-400" />
                  <h2 className="text-lg font-semibold text-white">Design Variables</h2>
                  <span className="text-xs bg-dark-600 text-dark-300 px-2 py-0.5 rounded-full">
                    {config?.design_variables.length || 0}
                  </span>
                </div>
                {expandedSections.has('variables') ? (
                  <ChevronUp className="w-5 h-5 text-dark-400" />
                ) : (
                  <ChevronDown className="w-5 h-5 text-dark-400" />
                )}
              </button>

              {expandedSections.has('variables') && (
                <div className="px-4 pb-4 space-y-2">
                  {config?.design_variables.map((v, idx) => (
                    <div
                      key={idx}
                      className="bg-dark-750 rounded-lg p-3 border border-dark-600"
                    >
                      <div className="flex items-center justify-between">
                        <span className="font-medium text-white font-mono text-sm">{v.name}</span>
                        <span className="text-xs bg-dark-600 text-dark-400 px-2 py-0.5 rounded">
                          {v.type}
                        </span>
                      </div>
                      <div className="flex items-center gap-4 text-sm text-dark-400 mt-1">
                        {v.low !== undefined && v.high !== undefined && (
                          <span>Range: [{v.low}, {v.high}]</span>
                        )}
                        {v.step && <span>Step: {v.step}</span>}
                        {v.unit && <span>{v.unit}</span>}
                        {v.choices && (
                          <span>Choices: {v.choices.join(', ')}</span>
                        )}
                      </div>
                    </div>
                  ))}
                  {config?.design_variables.length === 0 && (
                    <p className="text-dark-500 text-sm italic">No design variables configured</p>
                  )}
                  {designSpaceSize > 0 && (
                    <div className="text-xs text-dark-500 pt-2">
                      Design Space: ~{designSpaceSize.toExponential(2)} combinations
                    </div>
                  )}
                </div>
              )}
            </Card>

            {/* Constraints Panel */}
            <Card className="overflow-hidden">
              <button
                onClick={() => toggleSection('constraints')}
                className="w-full flex items-center justify-between p-4 hover:bg-dark-750 transition-colors"
              >
                <div className="flex items-center gap-3">
                  <AlertTriangle className="w-5 h-5 text-yellow-400" />
                  <h2 className="text-lg font-semibold text-white">Constraints</h2>
                  <span className="text-xs bg-dark-600 text-dark-300 px-2 py-0.5 rounded-full">
                    {config?.constraints.length || 0}
                  </span>
                </div>
                {expandedSections.has('constraints') ? (
                  <ChevronUp className="w-5 h-5 text-dark-400" />
                ) : (
                  <ChevronDown className="w-5 h-5 text-dark-400" />
                )}
              </button>

              {expandedSections.has('constraints') && (
                <div className="px-4 pb-4">
                  {(config?.constraints.length || 0) > 0 ? (
                    <table className="w-full text-sm">
                      <thead>
                        <tr className="text-dark-400 text-left">
                          <th className="pb-2">Name</th>
                          <th className="pb-2">Type</th>
                          <th className="pb-2">Bound</th>
                          <th className="pb-2">Unit</th>
                        </tr>
                      </thead>
                      <tbody className="text-dark-300">
                        {config?.constraints.map((c, idx) => (
                          <tr key={idx} className="border-t border-dark-700">
                            <td className="py-2 font-mono">{c.name}</td>
                            <td className="py-2">
                              {c.type === 'le' ? '≤' : c.type === 'ge' ? '≥' : '='}
                            </td>
                            <td className="py-2">{c.bound}</td>
                            <td className="py-2 text-dark-500">{c.unit || '-'}</td>
                          </tr>
                        ))}
                      </tbody>
                    </table>
                  ) : (
                    <p className="text-dark-500 text-sm italic">No constraints configured</p>
                  )}
                </div>
              )}
            </Card>
          </div>

          {/* Right Column */}
          <div className="space-y-6">
            {/* Algorithm Configuration */}
            <Card className="overflow-hidden">
              <button
                onClick={() => toggleSection('algorithm')}
                className="w-full flex items-center justify-between p-4 hover:bg-dark-750 transition-colors"
              >
                <div className="flex items-center gap-3">
                  <Cpu className="w-5 h-5 text-primary-400" />
                  <h2 className="text-lg font-semibold text-white">Algorithm Configuration</h2>
                </div>
                {expandedSections.has('algorithm') ? (
                  <ChevronUp className="w-5 h-5 text-dark-400" />
                ) : (
                  <ChevronDown className="w-5 h-5 text-dark-400" />
                )}
              </button>

              {expandedSections.has('algorithm') && (
                <div className="px-4 pb-4 space-y-3">
                  <div className="grid grid-cols-2 gap-4">
                    <div className="bg-dark-750 rounded-lg p-3 border border-dark-600">
                      <div className="text-xs text-dark-400 uppercase mb-1">Optimizer</div>
                      <div className="text-white font-medium">{config?.algorithm.name || 'Optuna'}</div>
                    </div>
                    <div className="bg-dark-750 rounded-lg p-3 border border-dark-600">
                      <div className="text-xs text-dark-400 uppercase mb-1">Sampler</div>
                      <div className="text-white font-medium">{config?.algorithm.sampler || 'TPE'}</div>
                    </div>
                    <div className="bg-dark-750 rounded-lg p-3 border border-dark-600">
                      <div className="text-xs text-dark-400 uppercase mb-1">Total Trials</div>
                      <div className="text-white font-medium">{config?.algorithm.n_trials || selectedStudy.progress.total}</div>
                    </div>
                    {config?.algorithm.pruner && (
                      <div className="bg-dark-750 rounded-lg p-3 border border-dark-600">
                        <div className="text-xs text-dark-400 uppercase mb-1">Pruner</div>
                        <div className="text-white font-medium">{config.algorithm.pruner}</div>
                      </div>
                    )}
                    {config?.algorithm.timeout && (
                      <div className="bg-dark-750 rounded-lg p-3 border border-dark-600">
                        <div className="text-xs text-dark-400 uppercase mb-1">Timeout</div>
                        <div className="text-white font-medium">{config.algorithm.timeout}s</div>
                      </div>
                    )}
                  </div>
                </div>
              )}
            </Card>

            {/* FEA Model Info */}
            {config?.fea_model && (
              <Card className="overflow-hidden">
                <button
                  onClick={() => toggleSection('model')}
                  className="w-full flex items-center justify-between p-4 hover:bg-dark-750 transition-colors"
                >
                  <div className="flex items-center gap-3">
                    <Box className="w-5 h-5 text-primary-400" />
                    <h2 className="text-lg font-semibold text-white">FEA Model</h2>
                  </div>
                  {expandedSections.has('model') ? (
                    <ChevronUp className="w-5 h-5 text-dark-400" />
                  ) : (
                    <ChevronDown className="w-5 h-5 text-dark-400" />
                  )}
                </button>

                {expandedSections.has('model') && (
                  <div className="px-4 pb-4 space-y-3">
                    <div className="grid grid-cols-2 gap-4">
                      <div className="bg-dark-750 rounded-lg p-3 border border-dark-600">
                        <div className="text-xs text-dark-400 uppercase mb-1">Software</div>
                        <div className="text-white font-medium">{config.fea_model.software}</div>
                      </div>
                      <div className="bg-dark-750 rounded-lg p-3 border border-dark-600">
                        <div className="text-xs text-dark-400 uppercase mb-1">Solver</div>
                        <div className="text-white font-medium">{config.fea_model.solver}</div>
                      </div>
                      {config.fea_model.mesh_elements && (
                        <div className="bg-dark-750 rounded-lg p-3 border border-dark-600">
                          <div className="text-xs text-dark-400 uppercase mb-1">Mesh Elements</div>
                          <div className="text-white font-medium">
                            {config.fea_model.mesh_elements.toLocaleString()}
                          </div>
                        </div>
                      )}
                      {config.fea_model.sim_file && (
                        <div className="bg-dark-750 rounded-lg p-3 border border-dark-600 col-span-2">
                          <div className="text-xs text-dark-400 uppercase mb-1">Simulation File</div>
                          <div className="text-white font-mono text-sm truncate">
                            {config.fea_model.sim_file}
                          </div>
                        </div>
                      )}
                    </div>
                  </div>
                )}
              </Card>
            )}

            {/* NX Model Files */}
            <Card className="overflow-hidden">
              <button
                onClick={() => toggleSection('modelFiles')}
                className="w-full flex items-center justify-between p-4 hover:bg-dark-750 transition-colors"
              >
                <div className="flex items-center gap-3">
                  <FileBox className="w-5 h-5 text-primary-400" />
                  <h2 className="text-lg font-semibold text-white">NX Model Files</h2>
                  <span className="text-xs bg-dark-600 text-dark-300 px-2 py-0.5 rounded-full">
                    {modelFiles.length}
                  </span>
                </div>
                {expandedSections.has('modelFiles') ? (
                  <ChevronUp className="w-5 h-5 text-dark-400" />
                ) : (
                  <ChevronDown className="w-5 h-5 text-dark-400" />
                )}
              </button>

              {expandedSections.has('modelFiles') && (
                <div className="px-4 pb-4 space-y-3">
                  {/* Open Folder Button */}
                  <button
                    onClick={handleOpenFolder}
                    className="w-full flex items-center justify-center gap-2 px-4 py-2 bg-dark-700 hover:bg-dark-600 text-dark-200 hover:text-white rounded-lg border border-dark-600 transition-colors"
                  >
                    <FolderOpen className="w-4 h-4" />
                    <span>Open Model Folder</span>
                  </button>

                  {/* Model Directory Path */}
                  {modelDir && (
                    <div className="text-xs text-dark-500 font-mono truncate" title={modelDir}>
                      {modelDir}
                    </div>
                  )}

                  {/* File List */}
                  {modelFiles.length > 0 ? (
                    <div className="space-y-2">
                      {modelFiles.map((file, idx) => (
                        <div
                          key={idx}
                          className="bg-dark-750 rounded-lg p-3 border border-dark-600"
                        >
                          <div className="flex items-center justify-between">
                            <div className="flex items-center gap-2">
                              <File className={`w-4 h-4 ${
                                file.extension === '.prt' ? 'text-blue-400' :
                                file.extension === '.sim' ? 'text-green-400' :
                                file.extension === '.fem' ? 'text-yellow-400' :
                                file.extension === '.bdf' || file.extension === '.dat' ? 'text-orange-400' :
                                file.extension === '.op2' ? 'text-purple-400' :
                                'text-dark-400'
                              }`} />
                              <span className="font-medium text-white text-sm truncate" title={file.name}>
                                {file.name}
                              </span>
                            </div>
                            <span className="text-xs bg-dark-600 text-dark-400 px-2 py-0.5 rounded uppercase">
                              {file.extension.slice(1)}
                            </span>
                          </div>
                          <div className="flex items-center justify-between mt-1 text-xs text-dark-500">
                            <span>{file.size_display}</span>
                            <span>{new Date(file.modified).toLocaleDateString()}</span>
                          </div>
                        </div>
                      ))}
                    </div>
                  ) : (
                    <p className="text-dark-500 text-sm italic text-center py-4">
                      No model files found
                    </p>
                  )}

                  {/* File Type Legend */}
                  {modelFiles.length > 0 && (
                    <div className="pt-2 border-t border-dark-700">
                      <div className="flex flex-wrap gap-3 text-xs text-dark-500">
                        <span className="flex items-center gap-1"><span className="w-2 h-2 bg-blue-400 rounded-full"></span>.prt = Part</span>
                        <span className="flex items-center gap-1"><span className="w-2 h-2 bg-green-400 rounded-full"></span>.sim = Simulation</span>
                        <span className="flex items-center gap-1"><span className="w-2 h-2 bg-yellow-400 rounded-full"></span>.fem = FEM</span>
                        <span className="flex items-center gap-1"><span className="w-2 h-2 bg-orange-400 rounded-full"></span>.bdf = Nastran</span>
                        <span className="flex items-center gap-1"><span className="w-2 h-2 bg-purple-400 rounded-full"></span>.op2 = Results</span>
                      </div>
                    </div>
                  )}
                </div>
              )}
            </Card>

            {/* Extractors */}
            {config?.extractors && config.extractors.length > 0 && (
              <Card className="overflow-hidden">
                <button
                  onClick={() => toggleSection('extractors')}
                  className="w-full flex items-center justify-between p-4 hover:bg-dark-750 transition-colors"
                >
                  <div className="flex items-center gap-3">
                    <Layers className="w-5 h-5 text-primary-400" />
                    <h2 className="text-lg font-semibold text-white">Extractors</h2>
                    <span className="text-xs bg-dark-600 text-dark-300 px-2 py-0.5 rounded-full">
                      {config.extractors.length}
                    </span>
                  </div>
                  {expandedSections.has('extractors') ? (
                    <ChevronUp className="w-5 h-5 text-dark-400" />
                  ) : (
                    <ChevronDown className="w-5 h-5 text-dark-400" />
                  )}
                </button>

                {expandedSections.has('extractors') && (
                  <div className="px-4 pb-4 space-y-2">
                    {config.extractors.map((ext, idx) => (
                      <div
                        key={idx}
                        className="bg-dark-750 rounded-lg p-3 border border-dark-600"
                      >
                        <div className="flex items-center justify-between">
                          <span className="font-medium text-white">{ext.name}</span>
                          <span className="text-xs bg-dark-600 text-dark-400 px-2 py-0.5 rounded">
                            {ext.type}
                          </span>
                        </div>
                        {ext.source && (
                          <div className="text-xs text-dark-500 mt-1 font-mono">{ext.source}</div>
                        )}
                      </div>
                    ))}
                  </div>
                )}
              </Card>
            )}

            {/* Study Stats */}
            <Card title="Current Progress">
              <div className="grid grid-cols-2 gap-4">
                <div className="bg-dark-750 rounded-lg p-4 border border-dark-600 text-center">
                  <div className="text-3xl font-bold text-white">
                    {selectedStudy.progress.current}
                  </div>
                  <div className="text-xs text-dark-400 uppercase mt-1">Trials Completed</div>
                </div>
                <div className="bg-dark-750 rounded-lg p-4 border border-dark-600 text-center">
                  <div className="text-3xl font-bold text-primary-400">
                    {selectedStudy.best_value?.toExponential(3) || 'N/A'}
                  </div>
                  <div className="text-xs text-dark-400 uppercase mt-1">Best Value</div>
                </div>
              </div>

              {/* Progress Bar */}
              <div className="mt-4">
                <div className="flex items-center justify-between text-sm mb-2">
                  <span className="text-dark-400">Progress</span>
                  <span className="text-white">
                    {Math.round((selectedStudy.progress.current / selectedStudy.progress.total) * 100)}%
                  </span>
                </div>
                <div className="h-2 bg-dark-700 rounded-full overflow-hidden">
                  <div
                    className="h-full bg-primary-500 rounded-full transition-all"
                    style={{
                      width: `${Math.min((selectedStudy.progress.current / selectedStudy.progress.total) * 100, 100)}%`
                    }}
                  />
                </div>
              </div>

              {/* Status Badge */}
              <div className="mt-4 flex items-center justify-center">
                <span className={`flex items-center gap-2 px-4 py-2 rounded-full text-sm font-medium ${
                  selectedStudy.status === 'running' ? 'bg-green-500/10 text-green-400' :
                  selectedStudy.status === 'completed' ? 'bg-blue-500/10 text-blue-400' :
                  selectedStudy.status === 'paused' ? 'bg-orange-500/10 text-orange-400' :
                  'bg-dark-600 text-dark-400'
                }`}>
                  {selectedStudy.status === 'completed' && <CheckCircle className="w-4 h-4" />}
                  {selectedStudy.status === 'running' && <Play className="w-4 h-4" />}
                  <span className="capitalize">{selectedStudy.status.replace('_', ' ')}</span>
                </span>
              </div>
            </Card>
          </div>
        </div>
      )}
    </div>
  );
}