"use client";

import React, { useState, useCallback, useEffect } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import {
  Command,
  CommandList,
  CommandEmpty,
  CommandGroup,
  CommandItem,
} from "@/components/ui/command";
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
import { Check, ChevronsUpDown, X, Search } from "lucide-react";
import { cn } from "@/lib/utils";
import { useDebounce } from "@/hooks/use-debounce";
import { searchProcurementItemsForSelector, ProcurementSearchItem, getProcurementItemByCode } from "./procurement-item-service";

interface ProcurementItemSelectorProps {
  selectedProcurementItem?: ProcurementSearchItem | null;
  onProcurementItemSelect?: (item: ProcurementSearchItem | null) => void;
  onClear?: () => void;
  placeholder?: string;
  disabled?: boolean;
  className?: string;
}

export function ProcurementItemSelector({
  selectedProcurementItem,
  onProcurementItemSelect,
  onClear,
  placeholder = "품목을 검색하세요...",
  disabled = false,
  className,
}: ProcurementItemSelectorProps) {
  const [open, setOpen] = useState(false);
  const [searchQuery, setSearchQuery] = useState("");
  const [searchResults, setSearchResults] = useState<ProcurementSearchItem[]>([]);
  const [isLoading, setIsLoading] = useState(false);

  const debouncedSearchQuery = useDebounce(searchQuery, 300);

  // 검색 쿼리가 변경될 때마다 검색 실행
  useEffect(() => {
    const performSearch = async () => {
      if (debouncedSearchQuery.length < 1) {
        setSearchResults([]);
        return;
      }

      setIsLoading(true);
      try {
        const results = await searchProcurementItemsForSelector(debouncedSearchQuery);
        setSearchResults(results);
      } catch (error) {
        console.error("품목 검색 실패:", error);
        setSearchResults([]);
      } finally {
        setIsLoading(false);
      }
    };

    performSearch();
  }, [debouncedSearchQuery]);

  // 품목 선택 핸들러
  const handleSelect = useCallback((item: ProcurementSearchItem) => {
    onProcurementItemSelect?.(item);
    setOpen(false);
    setSearchQuery("");
    setSearchResults([]);
  }, [onProcurementItemSelect]);

  // 선택 해제 핸들러
  const handleClear = useCallback(() => {
    onProcurementItemSelect?.(null);
    onClear?.();
    setSearchQuery("");
    setSearchResults([]);
  }, [onProcurementItemSelect, onClear]);

  return (
    <div className={cn("flex items-center space-x-2", className)}>
      <Popover open={open} onOpenChange={setOpen}>
        <PopoverTrigger asChild>
          <Button
            variant="outline"
            role="combobox"
            aria-expanded={open}
            className="w-full justify-between"
            disabled={disabled}
          >
            {selectedProcurementItem ? (
              <span className="truncate">
                {selectedProcurementItem.displayText}
              </span>
            ) : (
              <span className="text-muted-foreground">{placeholder}</span>
            )}
            <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
          </Button>
        </PopoverTrigger>
        <PopoverContent className="w-full p-0" align="start">
          <div className="p-2">
            <div className="relative">
              <Search className="absolute left-2 top-2.5 h-4 w-4 text-muted-foreground" />
              <Input
                placeholder="품목코드 또는 품목명으로 검색..."
                value={searchQuery}
                onChange={(e) => setSearchQuery(e.target.value)}
                className="pl-8"
                autoFocus
              />
            </div>
          </div>
          <Command>
            <CommandList>
              <CommandEmpty>
                {isLoading ? (
                  <div className="py-6 text-center text-sm text-muted-foreground">
                    검색 중...
                  </div>
                ) : searchQuery.length < 1 ? (
                  <div className="py-6 text-center text-sm text-muted-foreground">
                    품목코드 또는 품목명을 입력하세요
                  </div>
                ) : (
                  <div className="py-6 text-center text-sm text-muted-foreground">
                    검색 결과가 없습니다
                  </div>
                )}
              </CommandEmpty>
              <CommandGroup>
                {searchResults.map((item) => (
                  <CommandItem
                    key={item.itemCode}
                    value={item.itemCode}
                    onSelect={() => handleSelect(item)}
                    className="cursor-pointer"
                  >
                    <Check
                      className={cn(
                        "mr-2 h-4 w-4",
                        selectedProcurementItem?.itemCode === item.itemCode
                          ? "opacity-100"
                          : "opacity-0"
                      )}
                    />
                    <div className="flex flex-col">
                      <span className="font-medium">{item.itemCode}</span>
                      <span className="text-sm text-muted-foreground">{item.itemName}</span>
                    </div>
                  </CommandItem>
                ))}
              </CommandGroup>
            </CommandList>
          </Command>
        </PopoverContent>
      </Popover>

      {/* 선택 해제 버튼 */}
      {selectedProcurementItem && (
        <Button
          variant="ghost"
          size="sm"
          onClick={handleClear}
          disabled={disabled}
          className="h-8 w-8 p-0"
        >
          <X className="h-4 w-4" />
        </Button>
      )}
    </div>
  );
}