// components/auth/next-auth-reauth-modal.tsx
"use client"

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

import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { Button } from "@/components/ui/button"
import { toast } from "@/hooks/use-toast"
import { AlertCircle, Shield } from "lucide-react"

const reAuthSchema = z.object({
  password: z.string().min(1, "Password is required"),
})

type ReAuthFormValues = z.infer<typeof reAuthSchema>

interface NextAuthReAuthModalProps {
  isOpen: boolean
  onSuccess: () => void
  userEmail: string
}

export function NextAuthReAuthModal({ 
  isOpen, 
  onSuccess, 
  userEmail 
}: NextAuthReAuthModalProps) {
  const [isLoading, setIsLoading] = React.useState(false)
  const [attemptCount, setAttemptCount] = React.useState(0)

  const form = useForm<ReAuthFormValues>({
    resolver: zodResolver(reAuthSchema),
    defaultValues: {
      password: "",
    },
  })

  async function onSubmit(data: ReAuthFormValues) {
    setIsLoading(true)
    
    try {
      // Next-auth의 signIn 함수를 사용하여 재인증
      const result = await signIn("credentials", {
        email: userEmail,
        password: data.password,
        redirect: false, // 리다이렉트 하지 않음
        callbackUrl: undefined,
      })

      if (result?.error) {
        setAttemptCount(prev => prev + 1)
        
        // 3회 이상 실패 시 추가 보안 조치
        if (attemptCount >= 2) {
          toast({
            title: "Too many failed attempts",
            description: "Please wait a moment before trying again.",
            variant: "destructive",
          })
          // 30초 대기
          setTimeout(() => {
            setAttemptCount(0)
          }, 30000)
          return
        }

        toast({
          title: "Authentication failed",
          description: `Invalid password. ${2 - attemptCount} attempts remaining.`,
          variant: "destructive",
        })
        
        form.setError("password", {
          type: "manual",
          message: "Invalid password"
        })
      } else {
        // 재인증 성공
        setAttemptCount(0)
        onSuccess()
        form.reset()
        
        toast({
          title: "Authentication successful",
          description: "You can now access account settings.",
        })
      }
    } catch (error) {
      console.error("Re-authentication error:", error)
      toast({
        title: "Error",
        description: "An unexpected error occurred. Please try again.",
        variant: "destructive",
      })
    } finally {
      setIsLoading(false)
    }
  }

  // 모달이 닫힐 때 폼 리셋
  React.useEffect(() => {
    if (!isOpen) {
      form.reset()
      setAttemptCount(0)
    }
  }, [isOpen, form])

  return (
    <Dialog open={isOpen} onOpenChange={() => {}}>
      <DialogContent className="sm:max-w-[425px]">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-3">
            <div className="h-8 w-8 rounded-full bg-amber-100 flex items-center justify-center">
              <Shield className="h-5 w-5 text-amber-600" />
            </div>
            Security Verification
          </DialogTitle>
          <DialogDescription className="text-left">
            For your security, please confirm your password to access sensitive account settings.
            This verification is valid for 5 minutes.
          </DialogDescription>
        </DialogHeader>
        
        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-4">
            {/* 사용자 정보 표시 */}
            <div className="rounded-lg bg-blue-50 border border-blue-200 p-3">
              <div className="flex items-center gap-2">
                <div className="h-2 w-2 bg-blue-500 rounded-full"></div>
                <span className="text-sm font-medium text-blue-900">
                  Signed in as: {userEmail}
                </span>
              </div>
            </div>
            
            {/* 경고 메시지 (실패 횟수가 많을 때) */}
            {attemptCount >= 2 && (
              <div className="rounded-lg bg-red-50 border border-red-200 p-3">
                <div className="flex items-start gap-2">
                  <AlertCircle className="h-4 w-4 text-red-500 mt-0.5 flex-shrink-0" />
                  <div className="text-sm text-red-800">
                    <p className="font-medium">Security Alert</p>
                    <p>Multiple failed attempts detected. Please wait 30 seconds before trying again.</p>
                  </div>
                </div>
              </div>
            )}
            
            <FormField
              control={form.control}
              name="password"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Current Password</FormLabel>
                  <FormControl>
                    <Input 
                      type="password" 
                      placeholder="Enter your password"
                      disabled={attemptCount >= 3 || isLoading}
                      {...field} 
                      autoFocus
                      autoComplete="current-password"
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            
            <Button 
              type="submit" 
              className="w-full" 
              disabled={isLoading || attemptCount >= 3}
            >
              {isLoading ? (
                <>
                  <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-white mr-2"></div>
                  Verifying...
                </>
              ) : attemptCount >= 3 ? (
                "Please wait..."
              ) : (
                "Verify Identity"
              )}
            </Button>
          </form>
        </Form>
        
        <div className="text-xs text-muted-foreground text-center space-y-1">
          <p>This helps protect your account from unauthorized changes.</p>
          <p>Your session will remain active during verification.</p>
        </div>
      </DialogContent>
    </Dialog>
  )
}