"use client"

import { useState } from "react"
import { useRouter } from "next/navigation"
import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import { Eye, EyeOff, Loader2, CheckCircle } from "lucide-react"
import Link from "next/link"

import { Button } from "@/components/ui/button"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
import { Form, FormControl, FormField, FormItem, FormLabel, FormMessage } from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { Alert, AlertDescription } from "@/components/ui/alert"

import { registerSchema, type RegisterInput } from "@/lib/validation"

export default function SignUpPage() {
  const [showPassword, setShowPassword] = useState(false)
  const [isLoading, setIsLoading] = useState(false)
  const [error, setError] = useState("")
  const [success, setSuccess] = useState(false)
  const router = useRouter()

  const form = useForm<RegisterInput>({
    resolver: zodResolver(registerSchema),
    defaultValues: {
      name: "",
      email: "",
      password: "",
    },
  })

  const onSubmit = async (data: RegisterInput) => {
    setIsLoading(true)
    setError("")
    setSuccess(false)
    
    try {
      const response = await fetch("/api/auth/register", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(data),
      })

      const result = await response.json()

      if (!response.ok) {
        setError(result.error || "Registration failed")
        return
      }

      setSuccess(true)
      form.reset()
      
      // Redirect to login page after successful registration
      setTimeout(() => {
        router.push("/login")
      }, 2000)
      
    } catch (error) {
      setError("An unexpected error occurred")
    } finally {
      setIsLoading(false)
    }
  }

  if (success) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-background to-muted/20 p-4">
        <Card className="w-full max-w-md">
          <CardContent className="flex flex-col items-center space-y-4 pt-6">
            <CheckCircle className="h-16 w-16 text-green-500" />
            <div className="text-center space-y-2">
              <h2 className="text-2xl font-bold">Account Created!</h2>
              <p className="text-muted-foreground">
                Your account has been successfully created. You will be redirected to the sign in page.
              </p>
            </div>
            <Button asChild className="w-full">
              <Link href="/login">Go to Sign In</Link>
            </Button>
          </CardContent>
        </Card>
      </div>
    )
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-background to-muted/20 p-4">
      <Card className="w-full max-w-md">
        <CardHeader className="space-y-1">
          <CardTitle className="text-2xl text-center">Create Account</CardTitle>
          <CardDescription className="text-center">
            Enter your information to create a new account
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          {error && (
            <Alert variant="destructive">
              <AlertDescription>{error}</AlertDescription>
            </Alert>
          )}

          <Form {...form}>
            <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-4">
              <FormField
                control={form.control}
                name="name"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Full Name</FormLabel>
                    <FormControl>
                      <Input
                        placeholder="John Doe"
                        autoComplete="name"
                        {...field}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <FormField
                control={form.control}
                name="email"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Email</FormLabel>
                    <FormControl>
                      <Input
                        type="email"
                        placeholder="john@example.com"
                        autoComplete="email"
                        {...field}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <FormField
                control={form.control}
                name="password"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Password</FormLabel>
                    <FormControl>
                      <div className="relative">
                        <Input
                          type={showPassword ? "text" : "password"}
                          placeholder="Create a strong password"
                          autoComplete="new-password"
                          {...field}
                        />
                        <Button
                          type="button"
                          variant="ghost"
                          size="sm"
                          className="absolute right-0 top-0 h-full px-3 py-2 hover:bg-transparent"
                          onClick={() => setShowPassword(!showPassword)}
                        >
                          {showPassword ? (
                            <EyeOff className="h-4 w-4" />
                          ) : (
                            <Eye className="h-4 w-4" />
                          )}
                        </Button>
                      </div>
                    </FormControl>
                    <FormMessage />
                    <p className="text-xs text-muted-foreground">
                      Password must contain at least 8 characters with uppercase, lowercase, and a number.
                    </p>
                  </FormItem>
                )}
              />
              <Button type="submit" className="w-full" disabled={isLoading}>
                {isLoading && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
                Create Account
              </Button>
            </form>
          </Form>

          <div className="text-center text-sm">
            <span className="text-muted-foreground">Already have an account? </span>
            <Link href="/login" className="text-primary hover:underline font-medium">
              Sign in
            </Link>
          </div>

          <div className="text-center text-xs text-muted-foreground">
            <p>
              By creating an account, you agree to our{" "}
              <Button variant="link" className="h-auto p-0 text-xs">
                Terms of Service
              </Button>{" "}
              and{" "}
              <Button variant="link" className="h-auto p-0 text-xs">
                Privacy Policy
              </Button>
            </p>
          </div>
        </CardContent>
      </Card>
    </div>
  )
}