"use client";

import React, { useState, useEffect } from "react";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Checkbox } from "@/components/ui/checkbox";
import { Search, Loader2 } from "lucide-react";
import { useEntitySearch } from "../entity-search-input/useEntitySearch";
import { ItemSelectionModalProps } from "./types";

export function ItemSelectionModal({
  open,
  onOpenChange,
  sourceTable,
  sourceColumns,
  sourceSearchFields = [],
  multiSelect = true,
  filterCondition = {},
  modalTitle,
  alreadySelected = [],
  uniqueField,
  onSelect,
}: ItemSelectionModalProps) {
  const [localSearchText, setLocalSearchText] = useState("");
  const [selectedItems, setSelectedItems] = useState<any[]>([]);

  const { results, loading, error, search, clearSearch } = useEntitySearch({
    tableName: sourceTable,
    searchFields: sourceSearchFields.length > 0 ? sourceSearchFields : sourceColumns,
    filterCondition,
  });

  // 모달 열릴 때 초기 검색
  useEffect(() => {
    if (open) {
      search("", 1); // 빈 검색어로 전체 목록 조회
      setSelectedItems([]);
    } else {
      clearSearch();
      setLocalSearchText("");
      setSelectedItems([]);
    }
  }, [open]);

  const handleSearch = () => {
    search(localSearchText, 1);
  };

  const handleToggleItem = (item: any) => {
    if (!multiSelect) {
      setSelectedItems([item]);
      return;
    }

    const isSelected = selectedItems.some((selected) =>
      uniqueField
        ? selected[uniqueField] === item[uniqueField]
        : selected === item
    );

    if (isSelected) {
      setSelectedItems(
        selectedItems.filter((selected) =>
          uniqueField
            ? selected[uniqueField] !== item[uniqueField]
            : selected !== item
        )
      );
    } else {
      setSelectedItems([...selectedItems, item]);
    }
  };

  const handleConfirm = () => {
    onSelect(selectedItems);
    onOpenChange(false);
  };

  // 이미 추가된 항목인지 확인
  const isAlreadyAdded = (item: any): boolean => {
    if (!uniqueField) return false;
    return alreadySelected.some(
      (selected) => selected[uniqueField] === item[uniqueField]
    );
  };

  // 선택된 항목인지 확인
  const isSelected = (item: any): boolean => {
    return selectedItems.some((selected) =>
      uniqueField
        ? selected[uniqueField] === item[uniqueField]
        : selected === item
    );
  };

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-[95vw] sm:max-w-[900px] max-h-[90vh] overflow-y-auto">
        <DialogHeader>
          <DialogTitle className="text-base sm:text-lg">{modalTitle}</DialogTitle>
          <DialogDescription className="text-xs sm:text-sm">
            항목을 검색하고 선택하세요
            {multiSelect && " (다중 선택 가능)"}
          </DialogDescription>
        </DialogHeader>

        {/* 검색 입력 */}
        <div className="flex gap-2">
          <Input
            placeholder="검색어를 입력하세요"
            value={localSearchText}
            onChange={(e) => setLocalSearchText(e.target.value)}
            onKeyDown={(e) => {
              if (e.key === "Enter") {
                handleSearch();
              }
            }}
            className="h-8 text-xs sm:h-10 sm:text-sm"
          />
          <Button
            onClick={handleSearch}
            disabled={loading}
            className="h-8 text-xs sm:h-10 sm:text-sm"
          >
            {loading ? (
              <Loader2 className="h-4 w-4 animate-spin" />
            ) : (
              <Search className="h-4 w-4" />
            )}
            <span className="ml-2">검색</span>
          </Button>
        </div>

        {/* 선택된 항목 수 */}
        {selectedItems.length > 0 && (
          <div className="text-sm text-primary">
            {selectedItems.length}개 항목 선택됨
          </div>
        )}

        {/* 오류 메시지 */}
        {error && (
          <div className="text-sm text-destructive bg-destructive/10 p-3 rounded-md">
            {error}
          </div>
        )}

        {/* 검색 결과 테이블 */}
        <div className="border rounded-md overflow-hidden">
          <div className="overflow-x-auto">
            <table className="w-full text-xs sm:text-sm">
              <thead className="bg-muted">
                <tr>
                  {multiSelect && (
                    <th className="px-4 py-2 text-left font-medium text-muted-foreground w-12">
                      선택
                    </th>
                  )}
                  {sourceColumns.map((col) => (
                    <th
                      key={col}
                      className="px-4 py-2 text-left font-medium text-muted-foreground"
                    >
                      {col}
                    </th>
                  ))}
                </tr>
              </thead>
              <tbody>
                {loading && results.length === 0 ? (
                  <tr>
                    <td
                      colSpan={sourceColumns.length + (multiSelect ? 1 : 0)}
                      className="px-4 py-8 text-center"
                    >
                      <Loader2 className="h-6 w-6 animate-spin mx-auto" />
                      <p className="mt-2 text-muted-foreground">검색 중...</p>
                    </td>
                  </tr>
                ) : results.length === 0 ? (
                  <tr>
                    <td
                      colSpan={sourceColumns.length + (multiSelect ? 1 : 0)}
                      className="px-4 py-8 text-center text-muted-foreground"
                    >
                      검색 결과가 없습니다
                    </td>
                  </tr>
                ) : (
                  results.map((item, index) => {
                    const alreadyAdded = isAlreadyAdded(item);
                    const selected = isSelected(item);

                    return (
                      <tr
                        key={index}
                        className={`border-t transition-colors ${
                          alreadyAdded
                            ? "bg-muted/50 opacity-50"
                            : selected
                            ? "bg-primary/10"
                            : "hover:bg-accent cursor-pointer"
                        }`}
                        onClick={() => {
                          if (!alreadyAdded) {
                            handleToggleItem(item);
                          }
                        }}
                      >
                        {multiSelect && (
                          <td className="px-4 py-2">
                            <Checkbox
                              checked={selected}
                              disabled={alreadyAdded}
                              onCheckedChange={() => {
                                if (!alreadyAdded) {
                                  handleToggleItem(item);
                                }
                              }}
                            />
                          </td>
                        )}
                        {sourceColumns.map((col) => (
                          <td key={col} className="px-4 py-2">
                            {item[col] || "-"}
                          </td>
                        ))}
                      </tr>
                    );
                  })
                )}
              </tbody>
            </table>
          </div>
        </div>

        <DialogFooter className="gap-2 sm:gap-0">
          <Button
            variant="outline"
            onClick={() => onOpenChange(false)}
            className="h-8 flex-1 text-xs sm:h-10 sm:flex-none sm:text-sm"
          >
            취소
          </Button>
          <Button
            onClick={handleConfirm}
            disabled={selectedItems.length === 0}
            className="h-8 flex-1 text-xs sm:h-10 sm:flex-none sm:text-sm"
          >
            추가 ({selectedItems.length})
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}