"use client"

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

import { Button } from "@/components/ui/button"
import {
  Sheet,
  SheetClose,
  SheetContent,
  SheetDescription,
  SheetFooter,
  SheetHeader,
  SheetTitle,
} from "@/components/ui/sheet"
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { Switch } from "@/components/ui/switch"
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import { updateCodeGroup } from "../service"
import { codeGroups } from "@/db/schema/codeGroups"
import { z } from "zod"

const updateCodeGroupSchema = z.object({
  description: z.string().min(1, "Description은 필수입니다."),
  codeFormat: z.string().optional().refine((val) => {
    if (!val) return true; // 빈 값은 허용
    return /^[ANX]*$/.test(val);
  }, "Code Format은 A(영어 대문자), N(숫자), X(영어/숫자)만 입력 가능합니다."),
  controlType: z.string().min(1, "Control Type은 필수입니다."),
  isActive: z.boolean().default(true),
})

type UpdateCodeGroupFormValues = z.infer<typeof updateCodeGroupSchema>

interface CodeGroupsEditSheetProps {
  open: boolean
  onOpenChange: (open: boolean) => void
  data: typeof codeGroups.$inferSelect | null
  onSuccess: () => void
}

export function CodeGroupsEditSheet({
  open,
  onOpenChange,
  data,
  onSuccess,
}: CodeGroupsEditSheetProps) {
  const [isUpdatePending, startUpdateTransition] = React.useTransition()

  const form = useForm<UpdateCodeGroupFormValues>({
    resolver: zodResolver(updateCodeGroupSchema),
    defaultValues: {
      description: data?.description ?? "",
      codeFormat: data?.codeFormat ?? "",
      controlType: data?.controlType ?? "",
      isActive: data?.isActive ?? true,
    },
    mode: "onChange"
  })

  // Code Format을 기반으로 정규식 자동 생성 함수
  const generateExpression = (codeFormat: string): string => {
    if (!codeFormat) return ''
    
    let expression = '^'
    let currentChar = codeFormat[0]
    let count = 1
    
    for (let i = 1; i < codeFormat.length; i++) {
      if (codeFormat[i] === currentChar) {
        count++
      } else {
        // 이전 문자에 대한 정규식 추가
        if (currentChar === 'A') {
          expression += `[A-Z]{${count}}`
        } else if (currentChar === 'N') {
          expression += `[0-9]{${count}}`
        } else if (currentChar === 'X') {
          expression += `[A-Z0-9]{${count}}`
        }
        currentChar = codeFormat[i]
        count = 1
      }
    }
    
    // 마지막 문자 처리
    if (currentChar === 'A') {
      expression += `[A-Z]{${count}}`
    } else if (currentChar === 'N') {
      expression += `[0-9]{${count}}`
    } else if (currentChar === 'X') {
      expression += `[A-Z0-9]{${count}}`
    }
    
    expression += '$'
    return expression
  }

  React.useEffect(() => {
    if (data) {
      form.reset({
        description: data.description,
        codeFormat: data.codeFormat || "",
        controlType: data.controlType,
        isActive: data.isActive ?? true,
      })
    }
  }, [data, form])

  async function onSubmit(input: UpdateCodeGroupFormValues) {
    if (!data) return

    startUpdateTransition(async () => {
      try {
        // Code Format이 변경되면 Expression 자동 업데이트
        const expressions = generateExpression(input.codeFormat || "")
        
        const result = await updateCodeGroup({
          id: data.id,
          description: input.description,
          codeFormat: input.codeFormat,
          expressions: expressions,
          controlType: input.controlType,
          isActive: input.isActive,
        })
        
        if (result.success) {
          toast.success("Code Group이 성공적으로 수정되었습니다.")
          onSuccess()
          onOpenChange(false)
        } else {
          toast.error(result.error || "Code Group 수정에 실패했습니다.")
        }
      } catch (error) {
        console.error("Update error:", error)
        toast.error("Code Group 수정 중 오류가 발생했습니다.")
      }
    })
  }

  return (
    <Sheet open={open} onOpenChange={onOpenChange}>
      <SheetContent className="flex flex-col gap-6 sm:max-w-md">
        <SheetHeader className="text-left">
          <SheetTitle>Code Group 수정</SheetTitle>
          <SheetDescription>
            Code Group 정보를 수정하고 변경사항을 저장하세요
          </SheetDescription>
        </SheetHeader>
        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)} className="flex flex-col gap-4">
            <FormField
              control={form.control}
              name="description"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Description</FormLabel>
                  <FormControl>
                    <Input placeholder="예: PROJECT NO" {...field} />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name="codeFormat"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Code Format</FormLabel>
                  <FormControl>
                    <Input 
                      placeholder="예: AANNN (A:영어대문자, N:숫자, X:영어/숫자)" 
                      {...field}
                      onBlur={() => form.trigger('codeFormat')}
                    />
                  </FormControl>
                  <FormDescription>
                    A: 영어 대문자, N: 숫자, X: 영어 대문자 또는 숫자
                  </FormDescription>
                  <FormMessage />
                </FormItem>
              )}
            />

            <FormField
              control={form.control}
              name="controlType"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Control Type</FormLabel>
                  <Select onValueChange={field.onChange} defaultValue={field.value}>
                    <FormControl>
                      <SelectTrigger>
                        <SelectValue placeholder="Control Type을 선택하세요" />
                      </SelectTrigger>
                    </FormControl>
                    <SelectContent>
                      <SelectItem value="textbox">Textbox</SelectItem>
                      <SelectItem value="combobox">Combobox</SelectItem>
                    </SelectContent>
                  </Select>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name="isActive"
              render={({ field }) => (
                <FormItem className="flex flex-row items-center justify-between rounded-lg border p-4">
                  <div className="space-y-0.5">
                    <FormLabel className="text-base">활성 상태</FormLabel>
                  </div>
                  <FormControl>
                    <Switch
                      checked={field.value}
                      onCheckedChange={field.onChange}
                    />
                  </FormControl>
                </FormItem>
              )}
            />

            <SheetFooter className="gap-2 pt-2 sm:space-x-0">
              <SheetClose asChild>
                <Button type="button" variant="outline">
                  취소
                </Button>
              </SheetClose>
              <Button 
                type="submit" 
                disabled={isUpdatePending || !form.formState.isValid}
              >
                {isUpdatePending && (
                  <Loader
                    className="mr-2 size-4 animate-spin"
                    aria-hidden="true"
                  />
                )}
                저장
              </Button>
            </SheetFooter>
          </form>
        </Form>
      </SheetContent>
    </Sheet>
  )
}