"use client"

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

import { Button } from "@/components/ui/button"
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { Textarea } from "@/components/ui/textarea"
import { Switch } from "@/components/ui/switch"
import { Plus, Loader2 } from "lucide-react"
import { toast } from "sonner"
import { createComplianceSurveyTemplate } from "../services"
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import { complianceSurveyTemplates } from "@/db/schema/compliance"

const createTemplateSchema = z.object({
  name: z.string().min(1, "템플릿명을 입력해주세요.").max(100, "템플릿명은 100자 이하여야 합니다."),
  description: z.string().min(1, "설명을 입력해주세요.").max(500, "설명은 500자 이하여야 합니다."),
  isActive: z.boolean().default(true),
})

type CreateTemplateFormValues = z.infer<typeof createTemplateSchema>

interface ComplianceTemplateCreateDialogProps {
  templates?: typeof complianceSurveyTemplates.$inferSelect[]
}

export function ComplianceTemplateCreateDialog({
  templates = [],
}: ComplianceTemplateCreateDialogProps) {
  const [open, setOpen] = React.useState(false)
  const [isSubmitting, setIsSubmitting] = React.useState(false)
  const [selectedTemplateId, setSelectedTemplateId] = React.useState<string>("none")

  // react-hook-form 세팅
  const form = useForm<CreateTemplateFormValues>({
    resolver: zodResolver(createTemplateSchema),
    defaultValues: {
      name: "",
      description: "",
      isActive: true,
    },
    mode: "onChange",
  })

  const selectedTemplate = React.useMemo(() => {
    if (selectedTemplateId === "none") {
      return undefined
    }
    return templates.find((template) => String(template.id) === selectedTemplateId)
  }, [selectedTemplateId, templates])

  const nextVersionLabel = React.useMemo(() => {
    if (!selectedTemplate) {
      return null
    }
    const baseVersion = selectedTemplate.version || "1.0"
    const numericValue = Number(baseVersion)
    if (!Number.isNaN(numericValue)) {
      const hasDecimal = baseVersion.includes(".")
      const decimalDigits = hasDecimal ? baseVersion.split(".")[1]?.length ?? 0 : 0
      const incremented = numericValue + 1
      return hasDecimal ? incremented.toFixed(decimalDigits) : String(incremented)
    }
    return "1.0"
  }, [selectedTemplate])

  React.useEffect(() => {
    if (selectedTemplate) {
      form.setValue("name", selectedTemplate.name ?? "")
      form.setValue("description", selectedTemplate.description ?? "")
    }
  }, [selectedTemplate, form])

  async function onSubmit(data: CreateTemplateFormValues) {
    setIsSubmitting(true)
    try {
      const baseTemplateNumericId =
        selectedTemplateId !== "none" ? Number(selectedTemplateId) : undefined

      const result = await createComplianceSurveyTemplate({
        ...data,
        baseTemplateId: baseTemplateNumericId,
      })
      if (result) {
        toast.success("새로운 설문조사 템플릿이 생성되었습니다.")
        form.reset()
        setSelectedTemplateId("none")
        setOpen(false)
        // 페이지 새로고침으로 데이터 업데이트
        window.location.reload()
      }
    } catch (error) {
      console.error("템플릿 생성 오류:", error)
      toast.error("템플릿 생성에 실패했습니다.")
    } finally {
      setIsSubmitting(false)
    }
  }

  function handleDialogOpenChange(nextOpen: boolean) {
    if (!nextOpen) {
      form.reset()
      setSelectedTemplateId("none")
    }
    setOpen(nextOpen)
  }

  return (
    <Dialog open={open} onOpenChange={handleDialogOpenChange}>
      <DialogTrigger asChild>
        <Button variant="outline" size="sm">
          <Plus className="mr-2 h-4 w-4" />
          템플릿 추가
        </Button>
      </DialogTrigger>
      <DialogContent className="sm:max-w-[500px]">
        <DialogHeader>
          <DialogTitle>새 설문조사 템플릿 생성</DialogTitle>
          <DialogDescription>
            새로운 준법 설문조사 템플릿을 생성합니다. 템플릿 생성 후 질문을 추가할 수 있습니다.
          </DialogDescription>
        </DialogHeader>
        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-4">
            <FormField
              control={form.control}
              name="name"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>템플릿명 *</FormLabel>
                  <FormControl>
                    <Input 
                      placeholder="예: 준법 설문조사" 
                      {...field} 
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            
            <FormField
              control={form.control}
              name="description"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>설명 *</FormLabel>
                  <FormControl>
                    <Textarea 
                      placeholder="템플릿의 목적과 대상에 대한 설명을 입력하세요."
                      className="min-h-[80px]"
                      {...field} 
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            
            <div className="space-y-2">
              <FormLabel>기존 템플릿 불러오기 (선택)</FormLabel>
              <Select
                value={selectedTemplateId}
                onValueChange={(value) => setSelectedTemplateId(value)}
              >
                <FormControl>
                  <SelectTrigger>
                    <SelectValue placeholder="불러올 템플릿을 선택하세요" />
                  </SelectTrigger>
                </FormControl>
                <SelectContent>
                  <SelectItem value="none">선택하지 않음</SelectItem>
                  {templates.map((template) => (
                    <SelectItem key={template.id} value={String(template.id)}>
                      {template.name} (v{template.version})
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
              {selectedTemplate ? (
                <p className="text-sm text-muted-foreground">
                  선택한 템플릿을 기반으로 새 버전(v{nextVersionLabel})이 생성되며,
                  기존 템플릿은 자동으로 비활성화됩니다.
                </p>
              ) : (
                <p className="text-sm text-muted-foreground">
                  템플릿을 선택하지 않으면 새 템플릿이 기본 버전(v1.0)으로 생성됩니다.
                </p>
              )}
            </div>
            
            <FormField
              control={form.control}
              name="isActive"
              render={({ field }) => (
                <FormItem className="flex items-center space-x-2">
                  <FormControl>
                    <Switch 
                      checked={field.value}
                      onCheckedChange={field.onChange}
                    />
                  </FormControl>
                  <FormLabel>활성 상태</FormLabel>
                </FormItem>
              )}
            />
            
            <DialogFooter>
              <Button 
                type="button" 
                variant="outline" 
                onClick={() => setOpen(false)}
                disabled={isSubmitting}
              >
                취소
              </Button>
              <Button 
                type="submit" 
                disabled={isSubmitting}
              >
                {isSubmitting && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
                {isSubmitting ? "생성 중..." : "템플릿 생성"}
              </Button>
            </DialogFooter>
          </form>
        </Form>
      </DialogContent>
    </Dialog>
  )
}