import React, { useState } from 'react';
import { CBT_GLOSSARY, GlossaryEntry } from '../constants';
import { X, Search, BookOpen, Brain, Activity, HelpCircle } from 'lucide-react';
import { Button } from './ui/button';
import { Input } from './ui/input';
import { Badge } from './ui/badge';
import { ScrollArea } from './ui/scroll-area';
import { Card, CardHeader, CardTitle, CardContent } from './ui/card';

interface CBTReferenceProps {
  onClose: () => void;
}

const CBTReference: React.FC<CBTReferenceProps> = ({ onClose }) => {
  const [search, setSearch] = useState('');
  const [activeCategory, setActiveCategory] = useState<'All' | 'Distortion' | 'Technique' | 'Concept'>('All');

  const filtered = CBT_GLOSSARY.filter(entry => {
    const matchesSearch = entry.term.toLowerCase().includes(search.toLowerCase()) ||
      entry.definition.toLowerCase().includes(search.toLowerCase());
    const matchesCategory = activeCategory === 'All' || entry.category === activeCategory;
    return matchesSearch && matchesCategory;
  });

  const categories: ('All' | 'Distortion' | 'Technique' | 'Concept')[] = ['All', 'Distortion', 'Technique', 'Concept'];

  const getCategoryIcon = (cat: string) => {
    switch (cat) {
      case 'Distortion': return <Brain size={16} className="text-rose-500" />;
      case 'Technique': return <Activity size={16} className="text-teal-500" />;
      case 'Concept': return <HelpCircle size={16} className="text-amber-500" />;
      default: return <BookOpen size={16} />;
    }
  };

  return (
    <div className="fixed inset-0 z-[60] flex items-center justify-center p-4 bg-slate-900/60 backdrop-blur-sm">
      <div className="bg-white rounded-2xl shadow-2xl w-full max-w-4xl h-[85vh] overflow-hidden flex flex-col animate-in fade-in zoom-in duration-300">
        {/* Header */}
        <div className="p-6 bg-slate-50 border-b border-slate-200 flex justify-between items-center shrink-0">
          <div className="flex items-center gap-3">
            <div className="bg-teal-600 p-2 rounded-lg text-white">
              <BookOpen size={24} />
            </div>
            <div>
              <h2 className="text-xl font-bold text-slate-800">CBT Clinical Reference</h2>
              <p className="text-xs text-slate-500 font-medium uppercase tracking-widest">Evidence-Based Concepts & Frameworks</p>
            </div>
          </div>
          <Button variant="ghost" size="icon" onClick={onClose} className="text-slate-400 hover:bg-slate-200 rounded-xl">
            <X size={20} />
          </Button>
        </div>

        {/* Filters */}
        <div className="p-6 space-y-4 border-b border-slate-100 bg-white shrink-0">
          <div className="relative">
            <Search className="absolute left-4 top-1/2 -translate-y-1/2 text-slate-400" size={18} />
            <Input
              type="text"
              placeholder="Search concepts, distortions, or definitions..."
              value={search}
              onChange={(e) => setSearch(e.target.value)}
              className="w-full pl-12 pr-4 h-12 bg-slate-50 border-slate-200 rounded-xl focus-visible:ring-teal-500/50"
            />
          </div>

          <div className="flex flex-wrap gap-2">
            {categories.map(cat => (
              <Button
                key={cat}
                variant={activeCategory === cat ? "default" : "outline"}
                onClick={() => setActiveCategory(cat)}
                className={`rounded-full text-xs font-bold ${activeCategory === cat ? 'bg-teal-600 hover:bg-teal-700 shadow-md shadow-teal-100' : 'text-slate-500 hover:text-teal-600 hover:border-teal-200'}`}
              >
                {cat}
              </Button>
            ))}
          </div>
        </div>

        {/* Content */}
        <ScrollArea className="flex-grow bg-slate-50/30 p-6">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4 pb-6">
            {filtered.map((entry, idx) => (
              <Card key={idx} className="hover:border-teal-200 transition-all group shadow-sm border-slate-200">
                <CardHeader className="pb-2">
                  <div className="flex justify-between items-start mb-2">
                    <CardTitle className="text-base group-hover:text-teal-700 transition-colors">{entry.term}</CardTitle>
                    <Badge variant="outline" className="flex items-center gap-1.5 px-2 py-0.5 bg-slate-50 border-slate-100 rounded text-[9px] font-black uppercase tracking-tighter text-slate-500">
                      {getCategoryIcon(entry.category)}
                      {entry.category}
                    </Badge>
                  </div>
                </CardHeader>
                <CardContent>
                  <p className="text-sm text-slate-600 leading-relaxed mb-4 font-light">
                    {entry.definition}
                  </p>
                  {entry.example && (
                    <div className="bg-teal-50/50 p-3 rounded-xl border border-teal-100">
                      <span className="text-[9px] font-black uppercase text-teal-600 block mb-1">Clinical Example</span>
                      <p className="text-xs text-teal-800 italic leading-relaxed">"{entry.example}"</p>
                    </div>
                  )}
                </CardContent>
              </Card>
            ))}

            {filtered.length === 0 && (
              <div className="col-span-full py-20 text-center space-y-4">
                <div className="w-16 h-16 bg-slate-100 rounded-full flex items-center justify-center mx-auto text-slate-400">
                  <Search size={32} />
                </div>
                <p className="text-slate-400 text-sm font-medium">No concepts matching your search parameters.</p>
              </div>
            )}
          </div>
        </ScrollArea>

        {/* Footer */}
        <div className="p-4 bg-white border-t border-slate-100 text-center shrink-0">
          <p className="text-[10px] text-slate-400 font-medium uppercase tracking-widest">
            References compiled from clinical CBT standard frameworks.
          </p>
        </div>
      </div>
    </div>
  );
};

export default CBTReference;