/**
 * InboxStudyCard - Card displaying an inbox study with actions
 *
 * Shows study status, files, and provides actions for:
 * - Running introspection
 * - Generating README
 * - Finalizing the study
 */

import React, { useState, useEffect } from 'react';
import {
  FileText,
  Folder,
  Trash2,
  Play,
  CheckCircle,
  Clock,
  AlertCircle,
  Loader2,
  ChevronDown,
  ChevronRight,
  Sparkles,
  ArrowRight,
  Eye,
  Save,
} from 'lucide-react';
import { InboxStudy, SpecStatus, ExpressionInfo, InboxStudyDetail } from '../../types/intake';
import { intakeApi } from '../../api/intake';
import { FileDropzone } from './FileDropzone';
import { ContextFileUpload } from './ContextFileUpload';
import { ExpressionList } from './ExpressionList';

interface InboxStudyCardProps {
  study: InboxStudy;
  onRefresh: () => void;
  onSelect: (studyName: string) => void;
}

const statusConfig: Record<SpecStatus, { icon: React.ReactNode; color: string; label: string }> = {
  draft: {
    icon: <Clock className="w-4 h-4" />,
    color: 'text-dark-400 bg-dark-600',
    label: 'Draft',
  },
  introspected: {
    icon: <CheckCircle className="w-4 h-4" />,
    color: 'text-blue-400 bg-blue-500/10',
    label: 'Introspected',
  },
  configured: {
    icon: <CheckCircle className="w-4 h-4" />,
    color: 'text-green-400 bg-green-500/10',
    label: 'Configured',
  },
  validated: {
    icon: <CheckCircle className="w-4 h-4" />,
    color: 'text-green-400 bg-green-500/10',
    label: 'Validated',
  },
  ready: {
    icon: <CheckCircle className="w-4 h-4" />,
    color: 'text-primary-400 bg-primary-500/10',
    label: 'Ready',
  },
  running: {
    icon: <Play className="w-4 h-4" />,
    color: 'text-yellow-400 bg-yellow-500/10',
    label: 'Running',
  },
  completed: {
    icon: <CheckCircle className="w-4 h-4" />,
    color: 'text-green-400 bg-green-500/10',
    label: 'Completed',
  },
  failed: {
    icon: <AlertCircle className="w-4 h-4" />,
    color: 'text-red-400 bg-red-500/10',
    label: 'Failed',
  },
};

export const InboxStudyCard: React.FC<InboxStudyCardProps> = ({
  study,
  onRefresh,
  onSelect,
}) => {
  const [isExpanded, setIsExpanded] = useState(false);
  const [isIntrospecting, setIsIntrospecting] = useState(false);
  const [isGeneratingReadme, setIsGeneratingReadme] = useState(false);
  const [isDeleting, setIsDeleting] = useState(false);
  const [error, setError] = useState<string | null>(null);
  
  // Introspection data (fetched when expanded)
  const [studyDetail, setStudyDetail] = useState<InboxStudyDetail | null>(null);
  const [isLoadingDetail, setIsLoadingDetail] = useState(false);
  const [selectedExpressions, setSelectedExpressions] = useState<string[]>([]);
  const [showReadme, setShowReadme] = useState(false);
  const [readmeContent, setReadmeContent] = useState<string | null>(null);
  const [isSavingDVs, setIsSavingDVs] = useState(false);
  const [dvSaveMessage, setDvSaveMessage] = useState<string | null>(null);

  const status = statusConfig[study.status] || statusConfig.draft;
  
  // Fetch study details when expanded for the first time
  useEffect(() => {
    if (isExpanded && !studyDetail && !isLoadingDetail) {
      loadStudyDetail();
    }
  }, [isExpanded]);
  
  const loadStudyDetail = async () => {
    setIsLoadingDetail(true);
    try {
      const detail = await intakeApi.getInboxStudy(study.study_name);
      setStudyDetail(detail);
      
      // Auto-select candidate expressions
      const introspection = detail.spec?.model?.introspection;
      if (introspection?.expressions) {
        const candidates = introspection.expressions
          .filter((e: ExpressionInfo) => e.is_candidate)
          .map((e: ExpressionInfo) => e.name);
        setSelectedExpressions(candidates);
      }
    } catch (err) {
      console.error('Failed to load study detail:', err);
    } finally {
      setIsLoadingDetail(false);
    }
  };

  const handleIntrospect = async () => {
    setIsIntrospecting(true);
    setError(null);
    try {
      await intakeApi.introspect({ study_name: study.study_name });
      // Reload study detail to get new introspection data
      await loadStudyDetail();
      onRefresh();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Introspection failed');
    } finally {
      setIsIntrospecting(false);
    }
  };

  const handleGenerateReadme = async () => {
    setIsGeneratingReadme(true);
    setError(null);
    try {
      const response = await intakeApi.generateReadme(study.study_name);
      setReadmeContent(response.content);
      setShowReadme(true);
      onRefresh();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'README generation failed');
    } finally {
      setIsGeneratingReadme(false);
    }
  };

  const handleDelete = async () => {
    if (!confirm(`Delete inbox study "${study.study_name}"? This cannot be undone.`)) {
      return;
    }
    setIsDeleting(true);
    try {
      await intakeApi.deleteInboxStudy(study.study_name);
      onRefresh();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Delete failed');
      setIsDeleting(false);
    }
  };

  const handleSaveDesignVariables = async () => {
    if (selectedExpressions.length === 0) {
      setError('Please select at least one expression to use as a design variable');
      return;
    }
    
    setIsSavingDVs(true);
    setError(null);
    setDvSaveMessage(null);
    
    try {
      const result = await intakeApi.createDesignVariables(study.study_name, selectedExpressions);
      setDvSaveMessage(`Created ${result.total_created} design variable(s)`);
      // Reload study detail to see updated spec
      await loadStudyDetail();
      onRefresh();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to save design variables');
    } finally {
      setIsSavingDVs(false);
    }
  };

  const canIntrospect = study.status === 'draft' && study.model_files.length > 0;
  const canGenerateReadme = study.status === 'introspected';
  const canFinalize = ['introspected', 'configured'].includes(study.status);
  const canSaveDVs = study.status === 'introspected' && selectedExpressions.length > 0;

  return (
    <div className="glass rounded-xl border border-primary-400/10 overflow-hidden">
      {/* Header - Always visible */}
      <button
        onClick={() => setIsExpanded(!isExpanded)}
        className="w-full px-4 py-3 flex items-center justify-between hover:bg-white/5 transition-colors"
      >
        <div className="flex items-center gap-3">
          <div className="w-10 h-10 rounded-lg bg-dark-700 flex items-center justify-center">
            <Folder className="w-5 h-5 text-primary-400" />
          </div>
          <div className="text-left">
            <h4 className="text-white font-medium">{study.study_name}</h4>
            {study.description && (
              <p className="text-sm text-dark-400 truncate max-w-[300px]">
                {study.description}
              </p>
            )}
          </div>
        </div>
        <div className="flex items-center gap-3">
          {/* Status Badge */}
          <span className={`inline-flex items-center gap-1.5 px-2.5 py-1 rounded-full text-xs font-medium ${status.color}`}>
            {status.icon}
            {status.label}
          </span>
          {/* File Count */}
          <span className="text-dark-500 text-sm">
            {study.model_files.length} files
          </span>
          {/* Expand Icon */}
          {isExpanded ? (
            <ChevronDown className="w-4 h-4 text-dark-400" />
          ) : (
            <ChevronRight className="w-4 h-4 text-dark-400" />
          )}
        </div>
      </button>

      {/* Expanded Content */}
      {isExpanded && (
        <div className="px-4 pb-4 space-y-4 border-t border-primary-400/10 pt-4">
          {/* Error Display */}
          {error && (
            <div className="p-3 rounded-lg bg-red-500/10 border border-red-500/30 text-red-400 text-sm flex items-center gap-2">
              <AlertCircle className="w-4 h-4 flex-shrink-0" />
              {error}
            </div>
          )}

          {/* Success Message */}
          {dvSaveMessage && (
            <div className="p-3 rounded-lg bg-green-500/10 border border-green-500/30 text-green-400 text-sm flex items-center gap-2">
              <CheckCircle className="w-4 h-4 flex-shrink-0" />
              {dvSaveMessage}
            </div>
          )}

          {/* Files Section */}
          {study.model_files.length > 0 && (
            <div>
              <h5 className="text-sm font-medium text-dark-300 mb-2">Model Files</h5>
              <div className="flex flex-wrap gap-2">
                {study.model_files.map((file) => (
                  <span
                    key={file}
                    className="inline-flex items-center gap-1.5 px-2 py-1 rounded bg-dark-700 text-dark-300 text-xs"
                  >
                    <FileText className="w-3 h-3" />
                    {file}
                  </span>
                ))}
              </div>
            </div>
          )}

          {/* Model File Upload Section */}
          <div>
            <h5 className="text-sm font-medium text-dark-300 mb-2">Upload Model Files</h5>
            <FileDropzone 
              studyName={study.study_name} 
              onUploadComplete={onRefresh}
              compact={true}
            />
          </div>

          {/* Context File Upload Section */}
          <ContextFileUpload 
            studyName={study.study_name} 
            onUploadComplete={onRefresh}
          />

          {/* Introspection Results - Expressions */}
          {isLoadingDetail && (
            <div className="flex items-center gap-2 text-dark-400 text-sm py-4">
              <Loader2 className="w-4 h-4 animate-spin" />
              Loading introspection data...
            </div>
          )}
          
          {studyDetail?.spec?.model?.introspection?.expressions && 
           studyDetail.spec.model.introspection.expressions.length > 0 && (
            <ExpressionList
              expressions={studyDetail.spec.model.introspection.expressions}
              massKg={studyDetail.spec.model.introspection.mass_kg}
              selectedExpressions={selectedExpressions}
              onSelectionChange={setSelectedExpressions}
              readOnly={study.status === 'configured'}
              compact={true}
            />
          )}

          {/* README Preview Section */}
          {(readmeContent || study.status === 'configured') && (
            <div className="space-y-2">
              <div className="flex items-center justify-between">
                <h5 className="text-sm font-medium text-dark-300 flex items-center gap-2">
                  <FileText className="w-4 h-4" />
                  README.md
                </h5>
                <button
                  onClick={() => setShowReadme(!showReadme)}
                  className="flex items-center gap-1 px-2 py-1 text-xs rounded bg-dark-600 
                             text-dark-300 hover:bg-dark-500 transition-colors"
                >
                  <Eye className="w-3 h-3" />
                  {showReadme ? 'Hide' : 'Preview'}
                </button>
              </div>
              {showReadme && readmeContent && (
                <div className="max-h-64 overflow-y-auto rounded-lg border border-dark-600 
                                bg-dark-800 p-4">
                  <pre className="text-xs text-dark-300 whitespace-pre-wrap font-mono">
                    {readmeContent}
                  </pre>
                </div>
              )}
            </div>
          )}

          {/* No Files Warning */}
          {study.model_files.length === 0 && (
            <div className="p-3 rounded-lg bg-yellow-500/10 border border-yellow-500/30 text-yellow-400 text-sm flex items-center gap-2">
              <AlertCircle className="w-4 h-4 flex-shrink-0" />
              No model files found. Upload .prt, .sim, or .fem files to continue.
            </div>
          )}

          {/* Actions */}
          <div className="flex flex-wrap gap-2">
            {/* Introspect */}
            {canIntrospect && (
              <button
                onClick={handleIntrospect}
                disabled={isIntrospecting}
                className="flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm font-medium
                           bg-blue-500/10 text-blue-400 hover:bg-blue-500/20 
                           disabled:opacity-50 transition-colors"
              >
                {isIntrospecting ? (
                  <Loader2 className="w-4 h-4 animate-spin" />
                ) : (
                  <Play className="w-4 h-4" />
                )}
                Introspect Model
              </button>
            )}

            {/* Save Design Variables */}
            {canSaveDVs && (
              <button
                onClick={handleSaveDesignVariables}
                disabled={isSavingDVs}
                className="flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm font-medium
                           bg-green-500/10 text-green-400 hover:bg-green-500/20 
                           disabled:opacity-50 transition-colors"
              >
                {isSavingDVs ? (
                  <Loader2 className="w-4 h-4 animate-spin" />
                ) : (
                  <Save className="w-4 h-4" />
                )}
                Save as DVs ({selectedExpressions.length})
              </button>
            )}

            {/* Generate README */}
            {canGenerateReadme && (
              <button
                onClick={handleGenerateReadme}
                disabled={isGeneratingReadme}
                className="flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm font-medium
                           bg-purple-500/10 text-purple-400 hover:bg-purple-500/20 
                           disabled:opacity-50 transition-colors"
              >
                {isGeneratingReadme ? (
                  <Loader2 className="w-4 h-4 animate-spin" />
                ) : (
                  <Sparkles className="w-4 h-4" />
                )}
                Generate README
              </button>
            )}

            {/* Finalize */}
            {canFinalize && (
              <button
                onClick={() => onSelect(study.study_name)}
                className="flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm font-medium
                           bg-primary-500/10 text-primary-400 hover:bg-primary-500/20 
                           transition-colors"
              >
                <ArrowRight className="w-4 h-4" />
                Finalize Study
              </button>
            )}

            {/* Delete */}
            <button
              onClick={handleDelete}
              disabled={isDeleting}
              className="flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm font-medium
                         bg-red-500/10 text-red-400 hover:bg-red-500/20 
                         disabled:opacity-50 transition-colors ml-auto"
            >
              {isDeleting ? (
                <Loader2 className="w-4 h-4 animate-spin" />
              ) : (
                <Trash2 className="w-4 h-4" />
              )}
              Delete
            </button>
          </div>

          {/* Workflow Hint */}
          {study.status === 'draft' && study.model_files.length > 0 && (
            <p className="text-xs text-dark-500">
              Next step: Run introspection to discover expressions and model properties.
            </p>
          )}
          {study.status === 'introspected' && (
            <p className="text-xs text-dark-500">
              Next step: Generate README with Claude AI, then finalize to create the study.
            </p>
          )}
        </div>
      )}
    </div>
  );
};

export default InboxStudyCard;