"use client";

import { useEffect } from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { Dialog, DialogContent, DialogHeader, DialogTitle } from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { Label } from "@/components/ui/label";
import { Switch } from "@/components/ui/switch";

import { LoadingSpinner } from "@/components/common/LoadingSpinner";
import { useCodes, useCreateCode, useUpdateCode } from "@/hooks/queries/useCodes";
import { createCodeSchema, updateCodeSchema, type CreateCodeData, type UpdateCodeData } from "@/lib/schemas/commonCode";
import type { CodeInfo } from "@/types/commonCode";
import type { FieldError } from "react-hook-form";

interface CodeFormModalProps {
  isOpen: boolean;
  onClose: () => void;
  categoryCode: string;
  editingCode?: CodeInfo | null;
}

// 에러 메시지를 안전하게 문자열로 변환하는 헬퍼 함수
const getErrorMessage = (error: FieldError | undefined): string => {
  if (!error) return "";
  if (typeof error === "string") return error;
  return error.message || "";
};

export function CodeFormModal({ isOpen, onClose, categoryCode, editingCode }: CodeFormModalProps) {
  const { data: codes = [] } = useCodes(categoryCode);
  const createCodeMutation = useCreateCode();
  const updateCodeMutation = useUpdateCode();

  const isEditing = !!editingCode;

  // 폼 스키마 선택 (생성/수정에 따라)
  const schema = isEditing ? updateCodeSchema : createCodeSchema;

  const form = useForm({
    resolver: zodResolver(schema),
    mode: "onChange", // 실시간 검증 활성화
    defaultValues: {
      codeValue: "",
      codeName: "",
      codeNameEng: "",
      description: "",
      sortOrder: 1,
      ...(isEditing && { isActive: "Y" as const }),
    },
  });

  // 편집 모드일 때 기존 데이터 로드
  useEffect(() => {
    if (isOpen) {
      if (isEditing && editingCode) {
        // 수정 모드: 기존 데이터 로드 (codeValue는 표시용으로만 설정)
        form.reset({
          codeName: editingCode.code_name,
          codeNameEng: editingCode.code_name_eng || "",
          description: editingCode.description || "",
          sortOrder: editingCode.sort_order,
          isActive: editingCode.is_active as "Y" | "N", // 타입 캐스팅
        });

        // codeValue는 별도로 설정 (표시용)
        form.setValue("codeValue" as any, editingCode.code_value);
      } else {
        // 새 코드 모드: 자동 순서 계산
        const maxSortOrder = codes.length > 0 ? Math.max(...codes.map((c) => c.sort_order)) : 0;

        form.reset({
          codeValue: "",
          codeName: "",
          codeNameEng: "",
          description: "",
          sortOrder: maxSortOrder + 1,
        });
      }
    }
  }, [isOpen, isEditing, editingCode, codes, form]);

  const handleSubmit = form.handleSubmit(async (data) => {
    try {
      if (isEditing && editingCode) {
        // 수정
        await updateCodeMutation.mutateAsync({
          categoryCode,
          codeValue: editingCode.code_value,
          data: data as UpdateCodeData,
        });
      } else {
        // 생성
        await createCodeMutation.mutateAsync({
          categoryCode,
          data: data as CreateCodeData,
        });
      }

      onClose();
      form.reset();
    } catch (error) {
      console.error("코드 저장 실패:", error);
    }
  });

  const isLoading = createCodeMutation.isPending || updateCodeMutation.isPending;

  return (
    <Dialog open={isOpen} onOpenChange={onClose}>
      <DialogContent className="sm:max-w-[500px]">
        <DialogHeader>
          <DialogTitle>{isEditing ? "코드 수정" : "새 코드"}</DialogTitle>
        </DialogHeader>

        <form onSubmit={handleSubmit} className="space-y-4">
          {/* 코드값 */}
          <div className="space-y-2">
            <Label htmlFor="codeValue">코드값 *</Label>
            <Input
              id="codeValue"
              {...form.register("codeValue")}
              disabled={isLoading || isEditing} // 수정 시에는 비활성화
              placeholder="코드값을 입력하세요"
              className={(form.formState.errors as any)?.codeValue ? "border-red-500" : ""}
            />
            {(form.formState.errors as any)?.codeValue && (
              <p className="text-sm text-red-600">{getErrorMessage((form.formState.errors as any)?.codeValue)}</p>
            )}
          </div>

          {/* 코드명 */}
          <div className="space-y-2">
            <Label htmlFor="codeName">코드명 *</Label>
            <Input
              id="codeName"
              {...form.register("codeName")}
              disabled={isLoading}
              placeholder="코드명을 입력하세요"
              className={form.formState.errors.codeName ? "border-red-500" : ""}
            />
            {form.formState.errors.codeName && (
              <p className="text-sm text-red-600">{getErrorMessage(form.formState.errors.codeName)}</p>
            )}
          </div>

          {/* 영문명 */}
          <div className="space-y-2">
            <Label htmlFor="codeNameEng">코드 영문명 *</Label>
            <Input
              id="codeNameEng"
              {...form.register("codeNameEng")}
              disabled={isLoading}
              placeholder="코드 영문명을 입력하세요"
              className={form.formState.errors.codeNameEng ? "border-red-500" : ""}
            />
            {form.formState.errors.codeNameEng && (
              <p className="text-sm text-red-600">{getErrorMessage(form.formState.errors.codeNameEng)}</p>
            )}
          </div>

          {/* 설명 */}
          <div className="space-y-2">
            <Label htmlFor="description">설명 *</Label>
            <Textarea
              id="description"
              {...form.register("description")}
              disabled={isLoading}
              placeholder="설명을 입력하세요"
              rows={3}
              className={form.formState.errors.description ? "border-red-500" : ""}
            />
            {form.formState.errors.description && (
              <p className="text-sm text-red-600">{getErrorMessage(form.formState.errors.description)}</p>
            )}
          </div>

          {/* 정렬 순서 */}
          <div className="space-y-2">
            <Label htmlFor="sortOrder">정렬 순서</Label>
            <Input
              id="sortOrder"
              type="number"
              {...form.register("sortOrder", { valueAsNumber: true })}
              disabled={isLoading}
              min={1}
              className={form.formState.errors.sortOrder ? "border-red-500" : ""}
            />
            {form.formState.errors.sortOrder && (
              <p className="text-sm text-red-600">{getErrorMessage(form.formState.errors.sortOrder)}</p>
            )}
          </div>

          {/* 활성 상태 (수정 시에만) */}
          {isEditing && (
            <div className="flex items-center space-x-2">
              <Switch
                id="isActive"
                checked={form.watch("isActive") === "Y"}
                onCheckedChange={(checked) => form.setValue("isActive", checked ? "Y" : "N")}
                disabled={isLoading}
              />
              <Label htmlFor="isActive">{form.watch("isActive") === "Y" ? "활성" : "비활성"}</Label>
            </div>
          )}

          {/* 버튼 */}
          <div className="flex justify-end space-x-2 pt-4">
            <Button type="button" variant="outline" onClick={onClose} disabled={isLoading}>
              취소
            </Button>
            <Button type="submit" disabled={isLoading || !form.formState.isValid}>
              {isLoading ? (
                <>
                  <LoadingSpinner size="sm" className="mr-2" />
                  {isEditing ? "수정 중..." : "저장 중..."}
                </>
              ) : isEditing ? (
                "코드 수정"
              ) : (
                "코드 저장"
              )}
            </Button>
          </div>
        </form>
      </DialogContent>
    </Dialog>
  );
}