import { useState, useCallback, useRef, useEffect } from 'react'
import { createPortal } from 'react-dom'
import { cn } from '@/lib'
import { ItemImage } from '@/features/chat/components/ItemImage'
import { useChatInitStore } from '@/features/chat/stores/useChatInitStore'

export function ItemSection() {
  return (
    <div className="flex flex-col w-full flex-1 overflow-hidden min-h-0">
      <ItemImage />
      <ItemInfo />
    </div>
  )
}

interface TooltipState {
  text: string
  x: number
  y: number
  above?: boolean
}

function Tooltip({ text, x, y, above }: TooltipState) {
  return createPortal(
    <div
      className="fixed z-[9999] pointer-events-none"
      style={{ left: x, top: y, transform: above ? 'translateY(-100%)' : undefined }}
    >
      <div className="px-3 py-2 mb-1 rounded-lg bg-neutral-20 text-neutral-90 text-[11px] leading-[16px] whitespace-pre-wrap break-keep max-w-[240px] shadow-md border border-neutral-30">
        {text}
      </div>
    </div>,
    document.body,
  )
}

function ItemInfo() {
  const {
    item_code,
    item_price,
    item_vat_yn,
    item_model_name,
    item_maker_name,
    item_min_order_quantity,
    item_lead_time,
    item_spec,
    item_name,
  } = useChatInitStore()

  const [tooltip, setTooltip] = useState<TooltipState | null>(null)
  const hideTimer = useRef<ReturnType<typeof setTimeout> | null>(null)

  const showTooltip = useCallback((e: React.MouseEvent, text: string, above = false) => {
    if (hideTimer.current) clearTimeout(hideTimer.current)
    if (above) {
      const rect = e.currentTarget.getBoundingClientRect()
      setTooltip({ text, x: rect.left, y: rect.top - 8, above })
    } else {
      setTooltip({ text, x: e.clientX, y: e.clientY + 16, above })
    }
  }, [])

  const hideTooltip = useCallback(() => {
    hideTimer.current = setTimeout(() => setTooltip(null), 100)
  }, [])

  useEffect(() => () => {
    if (hideTimer.current) clearTimeout(hideTimer.current)
  }, [])

  const formatPrice = (price: number) => price.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',')
  const isNewItem = !item_code && !item_price
  const priceText = isNewItem ? '신규' : `${formatPrice(item_price)}원`
  const formattedPrice = `${priceText}(${item_vat_yn || 'VAT별도'})`

  const renderRow = (title: string, data: string, important = false) => {
    const textClass = important ? 'title-3 text-neutral-90' : 'body-3 text-neutral-70'
    const displayData = data || '-'
    return (
      <div className="flex items-start self-stretch gap-1 min-w-0">
        <div className={cn(textClass, 'w-[100px]')}>{title}</div>
        <div
          className={cn(textClass, 'w-[150px] break-keep cursor-default')}
          onMouseEnter={(e) => displayData !== '-' && showTooltip(e, displayData)}
          onMouseLeave={hideTooltip}
        >
          {displayData}
        </div>
      </div>
    )
  }

  return (
    <div className="flex flex-col w-full flex-1 overflow-hidden min-h-0">
      <div
        className="text-center headline-3 text-neutral-90 mb-4 truncate px-8 flex-shrink-0 cursor-default"
        onMouseEnter={(e) => item_name && showTooltip(e, item_name)}
        onMouseLeave={hideTooltip}
      >
        {item_name}
      </div>

      <div className="flex flex-1 items-start self-stretch mr-2 overflow-y-auto pr-6 pl-8 min-h-0">
        <div className="flex flex-col items-start self-stretch flex-[1_0_auto] gap-2 min-w-0">
          {renderRow('상품코드', item_code, true)}
          {renderRow('단가', formattedPrice, true)}
          {renderRow('모델명', item_model_name, true)}
          {renderRow('제조사', item_maker_name)}
          {renderRow('최소주문수량', item_min_order_quantity)}
          {renderRow('리드타임', item_lead_time)}

          <div className="flex items-start self-stretch gap-1 flex-[1_0]">
            <div className="body-3 text-neutral-70 w-[100px]">규격</div>
            <div
              className="body-3 text-neutral-70 self-stretch w-0 flex-[1_0] overflow-hidden whitespace-normal break-words break-keep cursor-default"
              onMouseEnter={(e) => item_spec && showTooltip(e, item_spec, true)}
              onMouseLeave={hideTooltip}
            >
              {item_spec || '-'}
            </div>
          </div>
        </div>
      </div>

      {tooltip && <Tooltip {...tooltip} />}
    </div>
  )
}