"use client";

import React, { useState, useEffect, useRef } from "react";
import { Input } from "@/components/ui/input";
import { X, Loader2, ChevronDown } from "lucide-react";
import { Button } from "@/components/ui/button";
import { useEntitySearch } from "../entity-search-input/useEntitySearch";
import { EntitySearchResult } from "../entity-search-input/types";
import { cn } from "@/lib/utils";
import { AutocompleteSearchInputConfig } from "./types";

interface AutocompleteSearchInputProps extends Partial<AutocompleteSearchInputConfig> {
  config?: AutocompleteSearchInputConfig;
  filterCondition?: Record<string, any>;
  disabled?: boolean;
  value?: any;
  onChange?: (value: any, fullData?: any) => void;
  className?: string;
}

export function AutocompleteSearchInputComponent({
  config,
  tableName: propTableName,
  displayField: propDisplayField,
  valueField: propValueField,
  searchFields: propSearchFields,
  filterCondition = {},
  placeholder: propPlaceholder,
  disabled = false,
  value,
  onChange,
  showAdditionalInfo: propShowAdditionalInfo,
  additionalFields: propAdditionalFields,
  className,
}: AutocompleteSearchInputProps) {
  // config prop 우선, 없으면 개별 prop 사용
  const tableName = config?.tableName || propTableName || "";
  const displayField = config?.displayField || propDisplayField || "";
  const valueField = config?.valueField || propValueField || "";
  const searchFields = config?.searchFields || propSearchFields || [displayField];
  const placeholder = config?.placeholder || propPlaceholder || "검색...";
  const showAdditionalInfo = config?.showAdditionalInfo ?? propShowAdditionalInfo ?? false;
  const additionalFields = config?.additionalFields || propAdditionalFields || [];
  const [inputValue, setInputValue] = useState("");
  const [isOpen, setIsOpen] = useState(false);
  const [selectedData, setSelectedData] = useState<EntitySearchResult | null>(null);
  const containerRef = useRef<HTMLDivElement>(null);

  const { searchText, setSearchText, results, loading, clearSearch } = useEntitySearch({
    tableName,
    searchFields,
    filterCondition,
  });

  // value가 변경되면 표시값 업데이트
  useEffect(() => {
    if (value && selectedData) {
      setInputValue(selectedData[displayField] || "");
    } else if (!value) {
      setInputValue("");
      setSelectedData(null);
    }
  }, [value, displayField]);

  // 외부 클릭 감지
  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (containerRef.current && !containerRef.current.contains(event.target as Node)) {
        setIsOpen(false);
      }
    };

    document.addEventListener("mousedown", handleClickOutside);
    return () => document.removeEventListener("mousedown", handleClickOutside);
  }, []);

  const handleInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const newValue = e.target.value;
    setInputValue(newValue);
    setSearchText(newValue);
    setIsOpen(true);
  };

  const handleSelect = (item: EntitySearchResult) => {
    setSelectedData(item);
    setInputValue(item[displayField] || "");
    onChange?.(item[valueField], item);
    setIsOpen(false);
  };

  const handleClear = () => {
    setInputValue("");
    setSelectedData(null);
    onChange?.(null, null);
    setIsOpen(false);
  };

  const handleInputFocus = () => {
    // 포커스 시 항상 검색 실행 (빈 값이면 전체 목록)
    if (!selectedData) {
      setSearchText(inputValue || "");
      setIsOpen(true);
    }
  };

  return (
    <div className={cn("relative", className)} ref={containerRef}>
      {/* 입력 필드 */}
      <div className="relative">
        <Input
          value={inputValue}
          onChange={handleInputChange}
          onFocus={handleInputFocus}
          placeholder={placeholder}
          disabled={disabled}
          className="h-8 text-xs sm:h-10 sm:text-sm pr-16"
        />
        <div className="absolute right-1 top-1/2 -translate-y-1/2 flex items-center gap-1">
          {loading && (
            <Loader2 className="h-4 w-4 animate-spin text-muted-foreground" />
          )}
          {inputValue && !disabled && (
            <Button
              type="button"
              variant="ghost"
              size="sm"
              onClick={handleClear}
              className="h-6 w-6 p-0"
            >
              <X className="h-3 w-3" />
            </Button>
          )}
          <ChevronDown className="h-4 w-4 text-muted-foreground" />
        </div>
      </div>

      {/* 드롭다운 결과 */}
      {isOpen && (results.length > 0 || loading) && (
        <div className="absolute z-50 w-full mt-1 bg-background border rounded-md shadow-lg max-h-[300px] overflow-y-auto">
          {loading && results.length === 0 ? (
            <div className="p-4 text-center text-sm text-muted-foreground">
              <Loader2 className="h-4 w-4 animate-spin mx-auto mb-2" />
              검색 중...
            </div>
          ) : results.length === 0 ? (
            <div className="p-4 text-center text-sm text-muted-foreground">
              검색 결과가 없습니다
            </div>
          ) : (
            <div className="py-1">
              {results.map((item, index) => (
                <button
                  key={index}
                  type="button"
                  onClick={() => handleSelect(item)}
                  className="w-full text-left px-3 py-2 hover:bg-accent text-xs sm:text-sm transition-colors"
                >
                  <div className="font-medium">{item[displayField]}</div>
                  {additionalFields.length > 0 && (
                    <div className="text-xs text-muted-foreground mt-1 space-y-0.5">
                      {additionalFields.map((field) => (
                        <div key={field}>
                          {field}: {item[field] || "-"}
                        </div>
                      ))}
                    </div>
                  )}
                </button>
              ))}
            </div>
          )}
        </div>
      )}

      {/* 추가 정보 표시 */}
      {showAdditionalInfo && selectedData && additionalFields.length > 0 && (
        <div className="mt-2 text-xs text-muted-foreground space-y-1 px-2">
          {additionalFields.map((field) => (
            <div key={field} className="flex gap-2">
              <span className="font-medium">{field}:</span>
              <span>{selectedData[field] || "-"}</span>
            </div>
          ))}
        </div>
      )}
    </div>
  );
}