import React, { useState } from 'react';
import { Trash2, Plus } from 'lucide-react';
import { Image } from '@/components/ui/image';

const PRESET_TAGS = [
  'Raw meat next to ready-to-eat food',
  'Same board for raw + cooked',
  'Soiled towel on food surface',
  'Food in the temperature danger zone',
  'Unwashed hands',
  'Improper storage',
  'Cross-contact allergen',
];

// Interactive hazard identification — tap a kitchen photo to mark hazards.
export default function HazardIdentifier({ course, onSubmit, submitting }) {
  const imageUrl = course?.challenge?.image_url;
  const [markers, setMarkers] = useState([]);
  const [pending, setPending] = useState(null);
  const [customLabel, setCustomLabel] = useState('');

  const addMarker = (e) => {
    if (submitting || pending) return;
    const rect = e.currentTarget.getBoundingClientRect();
    const x = (e.clientX - rect.left) / rect.width;
    const y = (e.clientY - rect.top) / rect.height;
    setPending({ x, y });
  };

  const confirm = (label) => {
    if (!pending) return;
    setMarkers([...markers, { ...pending, label }]);
    setPending(null);
    setCustomLabel('');
  };

  const remove = (i) => setMarkers(markers.filter((_, j) => j !== i));

  return (
    <div>
      <p className="text-[13px] text-[#64748B] mb-3">Tap anywhere on the kitchen photo to mark a hazard. Label each one, then submit for AI evaluation.</p>
      <div className="relative rounded-2xl overflow-hidden border border-[#E5E7EB] mb-3 select-none cursor-crosshair" onClick={addMarker}>
        {imageUrl ? (
          <Image src={imageUrl} alt="Kitchen scene" className="w-full max-h-80 object-cover" fittingType="fill" />
        ) : (
          <div className="w-full h-64 bg-[#F1F5F9] flex items-center justify-center text-[13px] text-[#94A3B8]">No scene image configured</div>
        )}
        {markers.map((m, i) => (
          <div key={i} className="absolute -translate-x-1/2 -translate-y-1/2 group" style={{ left: `${m.x * 100}%`, top: `${m.y * 100}%` }} onClick={(e) => e.stopPropagation()}>
            <span className="flex items-center justify-center w-6 h-6 rounded-full bg-red-500 text-white text-[11px] font-bold shadow ring-2 ring-white">{i + 1}</span>
            <span className="absolute left-1/2 -translate-x-1/2 top-7 whitespace-nowrap text-[10px] bg-white/95 rounded px-1.5 py-0.5 shadow text-[#0F172A]">{m.label}</span>
            <button onClick={() => remove(i)} className="absolute -top-1.5 -right-1.5 w-4 h-4 rounded-full bg-white text-red-500 shadow flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity"><Trash2 className="w-2.5 h-2.5" /></button>
          </div>
        ))}
        {pending && (
          <div className="absolute -translate-x-1/2 -translate-y-1/2 pointer-events-none" style={{ left: `${pending.x * 100}%`, top: `${pending.y * 100}%` }}>
            <span className="block w-6 h-6 rounded-full bg-[#0A39DF] ring-4 ring-white animate-pulse" />
          </div>
        )}
      </div>

      {pending && (
        <div className="rounded-xl border border-[#0A39DF] bg-[#EFF6FF] p-3 mb-3">
          <p className="text-[12px] font-medium text-[#1E40AF] mb-2">Label this hazard:</p>
          <div className="flex flex-wrap gap-1.5 mb-2">
            {PRESET_TAGS.map((t) => (
              <button key={t} onClick={() => confirm(t)} className="text-[11px] px-2.5 py-1 rounded-full bg-white border border-[#E5E7EB] text-[#374151] hover:border-[#0A39DF]">{t}</button>
            ))}
          </div>
          <div className="flex gap-2">
            <input value={customLabel} onChange={(e) => setCustomLabel(e.target.value)} placeholder="Or type your own…" className="flex-1 h-8 px-2.5 text-[12px] rounded-lg border border-[#E5E7EB] focus:border-[#0A39DF] focus:outline-none" />
            <button onClick={() => customLabel.trim() && confirm(customLabel.trim())} className="h-8 px-3 rounded-lg bg-[#0A39DF] text-white text-[12px] font-medium flex items-center gap-1"><Plus className="w-3.5 h-3.5" /> Add</button>
          </div>
        </div>
      )}

      <button onClick={() => onSubmit(markers)} disabled={markers.length === 0 || submitting || !!pending} className="w-full h-10 rounded-xl bg-[#0F172A] text-white text-[13px] font-semibold disabled:opacity-40">
        Submit {markers.length} hazard{markers.length !== 1 ? 's' : ''} for AI evaluation
      </button>
    </div>
  );
}