import { useMemo } from 'react'
import { ChevronDown } from 'lucide-react'
import { cn } from '@/lib'
import { useChatInitStore } from '@/features/chat/stores/useChatInitStore'

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

export function MDInformation({ isOpen, setIsOpen }: Props) {
  const { quotation_memo } = useChatInitStore()

  const memoArray = useMemo(() => {
    if (!quotation_memo?.trim()) return []
    return quotation_memo
      .split(/\r?\n+/)
      .map((s) => s.trim())
      .filter(Boolean)
  }, [quotation_memo])

  if (memoArray.length === 0) return null

  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">MD 안내사항</span>
        <ChevronDown
          size={16}
          className={cn('text-neutral-50 transition-transform duration-300', !isOpen && '-rotate-90')}
        />
      </button>

      {isOpen && (
        <div className="max-h-[220px] animate-fade-in overflow-y-auto pt-3">
          <div className="flex flex-col gap-2 break-keep">
            {memoArray.map((item, i) => (
              <div key={i} className="flex items-start gap-2 text-sm text-neutral-70">
                <span className="shrink-0 text-neutral-50">•</span>
                <div className="flex-1 whitespace-pre-wrap">{linkText(item)}</div>
              </div>
            ))}
          </div>
        </div>
      )}
    </section>
  )
}

function linkText(text: string) {
  const urlRegex = /(https?:\/\/[^\s]+)/g
  const isUrl = (s: string) => /^https?:\/\/[^\s]+$/.test(s)
  const parts = text.split(urlRegex)
  return (
    <div className="text-sm text-neutral-70">
      {parts.map((part, i) =>
        isUrl(part) ? (
          <a
            key={i}
            href={part}
            target="_blank"
            rel="noopener noreferrer"
            className="block text-brand-600 underline transition-all hover:brightness-95"
          >
            상품 사이트로 이동
          </a>
        ) : (
          <span key={i}>{i > 0 && isUrl(parts[i - 1]) ? part.replace(/^(\s)/, '') : part}</span>
        ),
      )}
    </div>
  )
}