import { Check, ChevronDown } from 'lucide-react'
import { cn } from '@/lib'
import { useChatStore } from '@/features/chat/stores/useChatStore'

interface Props {
  isOpen: boolean
  setIsOpen: (isOpen: boolean) => void
}

export const STEPS = [
  { name: '서비스안내', desc: '협상 방식과 유의사항을 확인합니다.' },
  { name: '담당자확인', desc: '협상 담당자 본인 여부를 확인합니다.' },
  { name: '협상품목안내', desc: '대상 품목과 기준 단가를 확인합니다.' },
  { name: '가격협상', desc: '공급 단가를 제안하고 조율합니다.' },
  { name: '협상종료', desc: '최종 합의 후 결과를 확인합니다.' },
]

export function NegoStep({ isOpen, setIsOpen }: Props) {
  const chats = useChatStore((s) => s.messages)
  const currentStep = chats[chats.length - 1]?.display_step || '서비스안내'
  const currentIndex = Math.max(
    0,
    STEPS.findIndex((s) => s.name === currentStep),
  )

  return (
    <section className="w-full">
      <button
        type="button"
        aria-expanded={isOpen}
        onClick={() => setIsOpen(!isOpen)}
        className="flex w-full items-center justify-between border-b border-border pb-2"
      >
        <span className="text-[11px] font-bold tracking-wide text-neutral-60">협상절차</span>
        <ChevronDown
          size={16}
          className={cn('text-neutral-50 transition-transform duration-300', !isOpen && '-rotate-90')}
        />
      </button>

      {isOpen && (
        <div className="animate-fade-in pt-4">
          <div className="relative">
            {/* 세로 레일 */}
            <span className="absolute left-[9px] top-3 bottom-3 w-0.5 bg-neutral-20" />
            {STEPS.map((step, i) => {
              const done = i < currentIndex
              const current = i === currentIndex
              return (
                <div key={step.name} className="relative flex items-start gap-3 py-1.5">
                  <div
                    className={cn(
                      'z-10 mt-0.5 flex size-5 shrink-0 items-center justify-center rounded-full text-[10px] font-bold transition-all',
                      done && 'bg-success text-white',
                      current && 'scale-110 bg-brand-600 text-white ring-4 ring-brand-light',
                      !done && !current && 'border border-border bg-white text-neutral-50',
                    )}
                  >
                    {done ? <Check className="size-3" strokeWidth={3} /> : i + 1}
                  </div>
                  <div className="min-w-0">
                    <p
                      className={cn(
                        'text-xs leading-tight',
                        current && 'font-extrabold text-brand-600',
                        done && 'font-semibold text-success',
                        !done && !current && 'font-medium text-neutral-80',
                      )}
                    >
                      {step.name}
                    </p>
                    <p className={cn('mt-0.5 text-[10px] leading-snug', current ? 'text-brand-600/80' : 'text-neutral-50')}>
                      {step.desc}
                    </p>
                  </div>
                </div>
              )
            })}
          </div>
        </div>
      )}
    </section>
  )
}