import { useState, useRef, useEffect } from 'react'
import { HelpCircle, Zap, CheckCircle, Trash2 } from 'lucide-react'
import { cn } from '@/lib/utils'
import type { TreeStructure } from '@/types'

interface AnswerStubCardProps {
  node: TreeStructure  // type === 'answer'
  fromOption?: string
  onSelectType: (nodeId: string, type: 'decision' | 'action' | 'solution') => void
  onDelete: (nodeId: string) => void
}

export function AnswerStubCard({ node, fromOption, onSelectType, onDelete }: AnswerStubCardProps) {
  const [picking, setPicking] = useState(false)
  const [confirming, setConfirming] = useState(false)
  const cardRef = useRef<HTMLDivElement>(null)
  const label = fromOption || node.title || 'Answer'

  // Collapse picker when clicking outside the card
  useEffect(() => {
    if (!picking) return
    const handleOutsideClick = (e: MouseEvent) => {
      if (cardRef.current && !cardRef.current.contains(e.target as Node)) {
        setPicking(false)
      }
    }
    document.addEventListener('mousedown', handleOutsideClick)
    return () => document.removeEventListener('mousedown', handleOutsideClick)
  }, [picking])

  return (
    <div
      ref={cardRef}
      className={cn(
        'relative min-w-[180px] max-w-[280px] rounded-xl border-2 border-dashed border-border bg-card/50',
        'transition-all duration-150',
        !picking && !confirming && 'cursor-pointer hover:border-primary/40 hover:bg-accent/30'
      )}
      onClick={() => !picking && !confirming && setPicking(true)}
    >
      {/* Delete button — top-right corner */}
      {!picking && !confirming && (
        <button
          type="button"
          onClick={(e) => { e.stopPropagation(); setConfirming(true) }}
          className="absolute top-1.5 right-1.5 rounded p-0.5 text-muted-foreground/40 hover:bg-red-500/10 hover:text-red-400 transition-colors"
          title="Delete stub"
        >
          <Trash2 className="h-3 w-3" />
        </button>
      )}

      {/* Label */}
      <div className="px-3 pt-2.5 pb-1 text-sm font-heading font-medium text-foreground text-center">
        {label}
      </div>

      {/* Confirm delete */}
      {confirming ? (
        <div className="px-2 pb-2.5 text-center space-y-1.5">
          <p className="text-[10px] text-muted-foreground">Delete this stub?</p>
          <div className="flex items-center justify-center gap-1.5">
            <button
              type="button"
              onClick={(e) => { e.stopPropagation(); onDelete(node.id) }}
              className="rounded-md px-2 py-1 text-[10px] font-label border border-red-500/30 bg-red-500/10 text-red-400 hover:bg-red-500/20"
            >
              Delete
            </button>
            <button
              type="button"
              onClick={(e) => { e.stopPropagation(); setConfirming(false) }}
              className="rounded-md px-2 py-1 text-[10px] font-label border border-border text-muted-foreground hover:bg-accent"
            >
              Cancel
            </button>
          </div>
        </div>
      ) : !picking ? (
        <div className="pb-2.5 text-center text-[10px] text-muted-foreground font-label">
          + Choose Type
        </div>
      ) : (
        <div className="flex items-center justify-center gap-1.5 pb-2.5 px-2">
          <button
            type="button"
            onClick={(e) => { e.stopPropagation(); onSelectType(node.id, 'decision') }}
            className={cn(
              'flex items-center gap-1 rounded-md px-2 py-1 text-[10px] font-label',
              'border border-blue-500/30 bg-blue-500/10 text-blue-400 hover:bg-blue-500/20'
            )}
          >
            <HelpCircle className="h-2.5 w-2.5" /> Decision
          </button>
          <button
            type="button"
            onClick={(e) => { e.stopPropagation(); onSelectType(node.id, 'action') }}
            className={cn(
              'flex items-center gap-1 rounded-md px-2 py-1 text-[10px] font-label',
              'border border-yellow-500/30 bg-yellow-500/10 text-yellow-400 hover:bg-yellow-500/20'
            )}
          >
            <Zap className="h-2.5 w-2.5" /> Action
          </button>
          <button
            type="button"
            onClick={(e) => { e.stopPropagation(); onSelectType(node.id, 'solution') }}
            className={cn(
              'flex items-center gap-1 rounded-md px-2 py-1 text-[10px] font-label',
              'border border-green-500/30 bg-green-500/10 text-green-400 hover:bg-green-500/20'
            )}
          >
            <CheckCircle className="h-2.5 w-2.5" /> Solution
          </button>
        </div>
      )}
    </div>
  )
}

export default AnswerStubCard
