'use client'

import { useEffect, useMemo, useRef, useState } from 'react'
import TaobaoImageGalleryModal from './TaobaoImageGalleryModal'
import { TaobaoDetailSummary } from '@/lib/taobao-detail-plus'

function extractItemId(value: string): string | null {
  const match = value.trim().match(/\d{8,20}/)
  return match ? match[0] : null
}

export default function HeaderTaobaoSearch() {
  const [keyword, setKeyword] = useState('')
  const [isLoading, setIsLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)
  const [result, setResult] = useState<TaobaoDetailSummary | null>(null)
  const [isExpanded, setIsExpanded] = useState(false)
  const [isModalOpen, setIsModalOpen] = useState(false)
  const containerRef = useRef<HTMLDivElement>(null)
  const inputRef = useRef<HTMLInputElement>(null)

  const normalizedItemId = useMemo(() => extractItemId(keyword), [keyword])

  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (containerRef.current && !containerRef.current.contains(event.target as Node)) {
        // 如果没有正在加载，也没有结果展示，或者用户点击了很远的地方，则收起
        if (!isLoading && !result && !error) {
          setIsExpanded(false)
        }
      }
    }

    document.addEventListener('mousedown', handleClickOutside)
    return () => document.removeEventListener('mousedown', handleClickOutside)
  }, [isLoading, result, error])

  // 当展开时，自动聚焦输入框
  useEffect(() => {
    if (isExpanded) {
      setTimeout(() => inputRef.current?.focus(), 100)
    }
  }, [isExpanded])

  const handleSearch = async (event?: React.FormEvent) => {
    event?.preventDefault()

    if (!normalizedItemId) {
      setError('请输入正确的商品ID')
      setResult(null)
      return
    }

    try {
      setIsLoading(true)
      setError(null)

      const response = await fetch(`/api/taobao-detail-plus?itemId=${encodeURIComponent(normalizedItemId)}`, {
        method: 'GET',
        cache: 'no-store',
      })

      const payload = await response.json().catch(() => null)
      if (!response.ok || !payload?.success) {
        throw new Error(payload?.error?.message || '商品查询失败，请稍后再试')
      }

      setResult(payload.data)
    } catch (searchError) {
      setResult(null)
      setError(searchError instanceof Error ? searchError.message : '商品查询失败，请稍后再试')
    } finally {
      setIsLoading(false)
    }
  }

  const handleClear = () => {
    setKeyword('')
    setError(null)
    setResult(null)
    // 如果清空后失焦，考虑是否收起
  }

  const showDropdown = isExpanded && (isLoading || error || result)

  return (
    <div ref={containerRef} className="relative flex items-center justify-end">
      {/* 搜索容器：控制宽度动画 */}
      <div
        className={`group relative flex items-center overflow-hidden rounded-full transition-all duration-300 ease-in-out ${
          isExpanded
            ? 'w-64 bg-gray-100 ring-2 ring-blue-500/20 dark:bg-gray-800'
            : 'w-10 bg-white/10 hover:bg-white/20 dark:bg-gray-800/50 dark:hover:bg-gray-700'
        }`}
      >
        {/* 点击触发图标 (在左侧保持固定) */}
        <button
          onClick={() => setIsExpanded(!isExpanded)}
          className={`flex h-10 w-10 shrink-0 items-center justify-center transition-colors ${
            isExpanded ? 'text-blue-500' : 'text-gray-300 dark:text-gray-400'
          }`}
          type="button"
        >
          <svg className="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
          </svg>
        </button>

        {/* 实际输入框：宽度随容器展开 */}
        <form onSubmit={handleSearch} className="flex-1 pr-10">
          <input
            ref={inputRef}
            type="text"
            value={keyword}
            onChange={(e) => setKeyword(e.target.value)}
            onFocus={() => setIsExpanded(true)}
            placeholder="粘贴链接或商品ID"
            className="w-full border-none bg-transparent py-2.5 text-sm text-gray-900 placeholder:text-gray-400 focus:outline-none focus:ring-0 dark:text-gray-100 dark:placeholder:text-gray-500"
          />
        </form>

        {/* 清空按钮 */}
        {isExpanded && keyword && (
          <button
            type="button"
            onClick={handleClear}
            className="absolute right-3 top-1/2 -translate-y-1/2 text-gray-400 transition-colors hover:text-gray-600 dark:hover:text-gray-200"
          >
            <svg className="h-4 w-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
            </svg>
          </button>
        )}
      </div>

      {/* 搜索结果下拉面板 (仅在展开且有状态时显示) */}
      {showDropdown && (
        <div className="absolute right-0 top-full z-50 mt-3 w-80 origin-top-right overflow-hidden rounded-2xl border border-gray-200 bg-white shadow-2xl animate-in fade-in zoom-in duration-200 dark:border-gray-700 dark:bg-gray-800">
          <div className="p-4">
            {isLoading && (
              <div className="flex items-center justify-center py-6">
                <div className="h-6 w-6 animate-spin rounded-full border-2 border-blue-500/20 border-t-blue-500" />
              </div>
            )}

            {error && !isLoading && (
              <div className="rounded-xl bg-red-50 p-3 text-xs text-red-600 dark:bg-red-900/20 dark:text-red-400">
                {error}
              </div>
            )}

            {result && !isLoading && (
              <div className="animate-in fade-in slide-in-from-top-2 duration-300">
                <div className="flex gap-3">
                  {result.mainImageUrl ? (
                    // eslint-disable-next-line @next/next/no-img-element
                    <img
                      src={result.mainImageUrl}
                      alt=""
                      className="h-16 w-16 rounded-lg border border-gray-100 object-cover dark:border-gray-700"
                    />
                  ) : (
                    <div className="flex h-16 w-16 items-center justify-center rounded-lg bg-gray-100 dark:bg-gray-700">
                      <svg className="h-6 w-6 text-gray-300" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z" />
                      </svg>
                    </div>
                  )}
                  <div className="min-w-0 flex-1">
                    <div className="line-clamp-2 text-sm font-bold text-gray-900 dark:text-gray-100">{result.title}</div>
                    <div className="mt-1 flex items-center gap-1.5 text-xs text-gray-500 dark:text-gray-400">
                      <span className="font-semibold text-orange-500">￥{result.price}</span>
                      <span>·</span>
                      <span className="truncate">{result.shopName}</span>
                    </div>
                  </div>
                </div>

                <div className="mt-4 grid grid-cols-2 gap-2">
                  <div className="rounded-lg bg-gray-50 p-2 text-center dark:bg-gray-700/50">
                    <div className="text-xs text-gray-500">SKU 图片</div>
                    <div className="text-sm font-bold text-gray-900 dark:text-gray-100">{result.skuImages?.length || 0}</div>
                  </div>
                  <div className="rounded-lg bg-gray-50 p-2 text-center dark:bg-gray-700/50">
                    <div className="text-xs text-gray-500">详情图片</div>
                    <div className="text-sm font-bold text-gray-900 dark:text-gray-100">{result.descImages?.length || 0}</div>
                  </div>
                </div>

                <button
                  onClick={() => {
                    setIsModalOpen(true)
                    // 不关闭展开状态，但可以暂时关闭结果面板（如果需要）
                  }}
                  className="mt-4 w-full rounded-xl bg-gray-900 py-2.5 text-sm font-bold text-white transition-all hover:bg-gray-800 active:scale-[0.98] dark:bg-blue-600 dark:hover:bg-blue-700"
                >
                  查看/下载全部图片
                </button>
              </div>
            )}
          </div>

          <div className="border-t border-gray-100 bg-gray-50/50 px-4 py-2 text-[10px] text-gray-400 dark:border-gray-700 dark:bg-gray-800/50">
            支持自动从商品链接中提取 ID
          </div>
        </div>
      )}

      {/* 全量图片预览弹窗 */}
      {result && (
        <TaobaoImageGalleryModal
          isOpen={isModalOpen}
          onClose={() => setIsModalOpen(false)}
          result={result}
        />
      )}
    </div>
  )
}