"use client"

import * as React from "react"
import { zodResolver } from "@hookform/resolvers/zod"
import { Loader } from "lucide-react"
import { useForm } from "react-hook-form"
import { toast } from "sonner"
import * as z from "zod"

import { Button } from "@/components/ui/button"
import { Checkbox } from "@/components/ui/checkbox"
import { Switch } from "@/components/ui/switch"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
  FormDescription,
} from "@/components/ui/form"
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import {
  Sheet,
  SheetClose,
  SheetContent,
  SheetDescription,
  SheetFooter,
  SheetHeader,
  SheetTitle,
} from "@/components/ui/sheet"
import {
  Dropzone,
  DropzoneZone,
  DropzoneUploadIcon,
  DropzoneTitle,
  DropzoneDescription,
  DropzoneInput
} from "@/components/ui/dropzone"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
import { Separator } from "@/components/ui/separator"
import { Badge } from "@/components/ui/badge"
import { updateTemplate } from "../service"
import { BasicContractTemplate } from "@/db/schema"
import { BUSINESS_UNITS, scopeHelpers } from "@/config/basicContractColumnsConfig"

// 템플릿 이름 옵션 정의
const TEMPLATE_NAME_OPTIONS = [
  "준법서약 (한글)",
  "준법서약 (영문)",
  "기술자료 요구서",
  "비밀유지 계약서",
  "표준하도급기본 계약서",
  "GTC",
  "안전보건관리 약정서",
  "동반성장",
  "윤리규범 준수 서약서",
  "기술자료 동의서",
  "내국신용장 미개설 합의서",
  "직납자재 하도급대급등 연동제 의향서"
] as const;

// 업데이트 템플릿 스키마 정의 (리비전 필드 제거, 워드파일만 허용)
export const updateTemplateSchema = z.object({
  templateName: z.enum(TEMPLATE_NAME_OPTIONS, {
    required_error: "템플릿 이름을 선택해주세요.",
  }),
  legalReviewRequired: z.boolean(),

  // 적용 범위
  shipBuildingApplicable: z.boolean(),
  windApplicable: z.boolean(),
  pcApplicable: z.boolean(),
  nbApplicable: z.boolean(),
  rcApplicable: z.boolean(),
  gyApplicable: z.boolean(),
  sysApplicable: z.boolean(),
  infraApplicable: z.boolean(),

  file: z
    .instanceof(File, { message: "파일을 업로드해주세요." })
    .refine((file) => file.size <= 100 * 1024 * 1024, {
      message: "파일 크기는 100MB 이하여야 합니다.",
    })
    .refine(
      (file) =>
        file.type === 'application/msword' ||
        file.type === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
      { message: "워드 파일(.doc, .docx)만 업로드 가능합니다." }
    )
    .optional(),
}).refine((data) => {
  // 적어도 하나의 적용 범위는 선택되어야 함
  const hasAnyScope = BUSINESS_UNITS.some(unit =>
    data[unit.key as keyof typeof data] as boolean
  );
  return hasAnyScope;
}, {
  message: "적어도 하나의 적용 범위를 선택해야 합니다.",
  path: ["shipBuildingApplicable"],
});

export type UpdateTemplateSchema = z.infer<typeof updateTemplateSchema>

interface UpdateTemplateSheetProps
  extends React.ComponentPropsWithRef<typeof Sheet> {
  template: BasicContractTemplate | null
  onSuccess?: () => void
}

export function UpdateTemplateSheet({ template, onSuccess, ...props }: UpdateTemplateSheetProps) {
  const [isUpdatePending, startUpdateTransition] = React.useTransition()
  const [selectedFile, setSelectedFile] = React.useState<File | null>(null)

  const form = useForm<UpdateTemplateSchema>({
    resolver: zodResolver(updateTemplateSchema),
    defaultValues: {
      templateName: template?.templateName as typeof TEMPLATE_NAME_OPTIONS[number] ?? "준법서약 (한글)",
      legalReviewRequired: template?.legalReviewRequired ?? false,
      shipBuildingApplicable: template?.shipBuildingApplicable ?? false,
      windApplicable: template?.windApplicable ?? false,
      pcApplicable: template?.pcApplicable ?? false,
      nbApplicable: template?.nbApplicable ?? false,
      rcApplicable: template?.rcApplicable ?? false,
      gyApplicable: template?.gyApplicable ?? false,
      sysApplicable: template?.sysApplicable ?? false,
      infraApplicable: template?.infraApplicable ?? false,
    },
    mode: "onChange"
  })

  // 파일 선택 핸들러
  const handleFileChange = (files: File[]) => {
    if (files.length > 0) {
      const file = files[0];
      setSelectedFile(file);
      form.setValue("file", file);
    }
  };

  // 모든 적용 범위 선택/해제
  const handleSelectAllScopes = (checked: boolean | "indeterminate") => {
    const value = checked === true;
    BUSINESS_UNITS.forEach(unit => {
      form.setValue(unit.key as keyof UpdateTemplateSchema, value);
    });
  };

  // 템플릿 변경 시 폼 값 업데이트
  React.useEffect(() => {
    if (template) {
      form.reset({
        templateName: template.templateName as typeof TEMPLATE_NAME_OPTIONS[number],
        legalReviewRequired: template.legalReviewRequired ?? false,
        shipBuildingApplicable: template.shipBuildingApplicable ?? false,
        windApplicable: template.windApplicable ?? false,
        pcApplicable: template.pcApplicable ?? false,
        nbApplicable: template.nbApplicable ?? false,
        rcApplicable: template.rcApplicable ?? false,
        gyApplicable: template.gyApplicable ?? false,
        sysApplicable: template.sysApplicable ?? false,
        infraApplicable: template.infraApplicable ?? false,
      });
    }
  }, [template, form]);

  // 현재 선택된 적용 범위 수
  const selectedScopesCount = BUSINESS_UNITS.filter(unit =>
    form.watch(unit.key as keyof UpdateTemplateSchema)
  ).length;

  function onSubmit(input: UpdateTemplateSchema) {
    startUpdateTransition(async () => {
      if (!template) return

      // FormData 객체 생성하여 파일과 데이터를 함께 전송
      const formData = new FormData();
      formData.append("templateName", input.templateName);
      formData.append("legalReviewRequired", input.legalReviewRequired.toString());

      // 적용 범위 추가
      BUSINESS_UNITS.forEach(unit => {
        const value = input[unit.key as keyof UpdateTemplateSchema] as boolean;
        formData.append(unit.key, value.toString());
      });

      if (input.file) {
        formData.append("file", input.file);
      }

      try {
        // 서비스 함수 호출
        const { error } = await updateTemplate({
          id: template.id,
          formData,
        });

        if (error) {
          toast.error(error);
          return;
        }

        form.reset();
        setSelectedFile(null);
        props.onOpenChange?.(false);
        toast.success("템플릿이 성공적으로 업데이트되었습니다.");
        onSuccess?.();
      } catch (error) {
        console.error("Update error:", error);
        toast.error("템플릿 업데이트 중 오류가 발생했습니다.");
      }
    });
  }

  if (!template) return null;

  const scopeSelected = BUSINESS_UNITS.some(
    (unit) => form.watch(unit.key as keyof UpdateTemplateSchema)
  );

  const isDisabled =
    isUpdatePending ||
    !form.watch("templateName") ||
    !scopeSelected;

  return (
    <Sheet {...props}>
      <SheetContent className="sm:max-w-[600px] h-[100vh] flex flex-col p-0">
        {/* 고정된 헤더 */}
        <SheetHeader className="p-6 pb-4 border-b">
          <SheetTitle>템플릿 업데이트</SheetTitle>
          <SheetDescription>
            템플릿 정보를 수정하고 변경사항을 저장하세요
            <span className="text-red-500 mt-1 block text-sm">* 표시된 항목은 필수 입력사항입니다.</span>
          </SheetDescription>
        </SheetHeader>

        {/* 스크롤 가능한 컨텐츠 영역 */}
        <div className="flex-1 overflow-y-auto px-6">
          <Form {...form}>
            <form
              onSubmit={form.handleSubmit(onSubmit)}
              className="space-y-6 py-4"
            >
              {/* 기본 정보 */}
              <Card>
                <CardHeader>
                  <CardTitle className="text-lg">기본 정보</CardTitle>
                  <CardDescription>
                    현재 리비전: <Badge variant="outline">v{template.revision}</Badge>
                    <br />
                    현재 적용 범위: {scopeHelpers.getScopeDisplayText(template)}
                  </CardDescription>
                </CardHeader>
                <CardContent className="space-y-4">
                  <div className="grid grid-cols-1 gap-4">
                    <FormField
                      control={form.control}
                      name="templateName"
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>
                            템플릿 이름 <span className="text-red-500">*</span>
                          </FormLabel>
                          <Select onValueChange={field.onChange} defaultValue={field.value}>
                            <FormControl>
                              <SelectTrigger>
                                <SelectValue placeholder="템플릿 이름을 선택하세요" />
                              </SelectTrigger>
                            </FormControl>
                            <SelectContent>
                              <SelectGroup>
                                {TEMPLATE_NAME_OPTIONS.map((option) => (
                                  <SelectItem key={option} value={option}>
                                    {option}
                                  </SelectItem>
                                ))}
                              </SelectGroup>
                            </SelectContent>
                          </Select>
                          <FormDescription>
                            미리 정의된 템플릿 중에서 선택
                          </FormDescription>
                          <FormMessage />
                        </FormItem>
                      )}
                    />
                  </div>

                  <FormField
                    control={form.control}
                    name="legalReviewRequired"
                    render={({ field }) => (
                      <FormItem className="flex flex-row items-center justify-between rounded-lg border p-3 shadow-sm">
                        <div className="space-y-0.5">
                          <FormLabel>법무검토 필요</FormLabel>
                          <FormDescription>
                            법무팀 검토가 필요한 템플릿인지 설정
                          </FormDescription>
                        </div>
                        <FormControl>
                          <Switch
                            checked={field.value}
                            onCheckedChange={field.onChange}
                          />
                        </FormControl>
                      </FormItem>
                    )}
                  />
                </CardContent>
              </Card>

              {/* 적용 범위 */}
              <Card>
                <CardHeader>
                  <CardTitle className="text-lg">
                    적용 범위 <span className="text-red-500">*</span>
                  </CardTitle>
                  <CardDescription>
                    이 템플릿이 적용될 사업부를 선택하세요. ({selectedScopesCount}개 선택됨)
                  </CardDescription>
                </CardHeader>
                <CardContent className="space-y-4">
                  <div className="flex items-center space-x-2">
                    <Checkbox
                      id="select-all"
                      checked={selectedScopesCount === BUSINESS_UNITS.length}
                      onCheckedChange={handleSelectAllScopes}
                    />
                    <label htmlFor="select-all" className="text-sm font-medium">
                      전체 선택
                    </label>
                  </div>

                  <Separator />

                  <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
                    {BUSINESS_UNITS.map((unit) => (
                      <FormField
                        key={unit.key}
                        control={form.control}
                        name={unit.key as keyof UpdateTemplateSchema}
                        render={({ field }) => (
                          <FormItem className="flex flex-row items-start space-x-3 space-y-0">
                            <FormControl>
                              <Checkbox
                                checked={field.value as boolean}
                                onCheckedChange={field.onChange}
                              />
                            </FormControl>
                            <div className="space-y-1 leading-none">
                              <FormLabel className="text-sm font-normal">
                                {unit.label}
                              </FormLabel>
                            </div>
                          </FormItem>
                        )}
                      />
                    ))}
                  </div>

                  {form.formState.errors.shipBuildingApplicable && (
                    <p className="text-sm text-destructive">
                      {form.formState.errors.shipBuildingApplicable.message}
                    </p>
                  )}
                </CardContent>
              </Card>

              {/* 파일 업데이트 */}
              <Card>
                <CardHeader>
                  <CardTitle className="text-lg">파일 업데이트</CardTitle>
                  <CardDescription>
                    현재 파일: {template.fileName}
                  </CardDescription>
                </CardHeader>
                <CardContent>
                  <FormField
                    control={form.control}
                    name="file"
                    render={() => (
                      <FormItem>
                        <FormLabel>템플릿 파일 (선택사항)</FormLabel>
                        <FormControl>
                          <Dropzone
                            onDrop={handleFileChange}
                            accept={{
                              'application/msword': ['.doc'],
                              'application/vnd.openxmlformats-officedocument.wordprocessingml.document': ['.docx']
                            }}
                          >
                            <DropzoneZone>
                              <DropzoneUploadIcon className="h-10 w-10 text-muted-foreground" />
                              <DropzoneTitle>
                                {selectedFile
                                  ? selectedFile.name
                                  : "새 워드 파일을 드래그하세요 (선택사항)"}
                              </DropzoneTitle>
                              <DropzoneDescription>
                                {selectedFile
                                  ? `파일 크기: ${(selectedFile.size / (1024 * 1024)).toFixed(2)} MB`
                                  : "또는 클릭하여 워드 파일(.doc, .docx)을 선택하세요 (최대 100MB)"}
                              </DropzoneDescription>
                              <DropzoneInput />
                            </DropzoneZone>
                          </Dropzone>
                        </FormControl>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                </CardContent>
              </Card>
            </form>
          </Form>
        </div>

        {/* 고정된 푸터 */}
        <SheetFooter className="p-6 pt-4 border-t">
          <SheetClose asChild>
            <Button type="button" variant="outline">
              취소
            </Button>
          </SheetClose>
          <Button
            type="button"
            onClick={form.handleSubmit(onSubmit)}
            disabled={isDisabled}
          >
            {isUpdatePending && (
              <Loader className="mr-2 size-4 animate-spin" aria-hidden="true" />
            )}
            저장
          </Button>
        </SheetFooter>
      </SheetContent>
    </Sheet>
  )
}