"use client"

import * as React from "react"
import Link from "next/link"
import { useRouter } from "next/navigation"
import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import { IconLoader } from "@tabler/icons-react"
import { toast } from "sonner"

import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { PasswordInput } from "@/components/auth/password-input"
import { signupSchema, type SignupInput } from "@/lib/validations/auth"

export function SignupForm() {
  const router = useRouter()
  const [isLoading, setIsLoading] = React.useState(false)

  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm<SignupInput>({
    resolver: zodResolver(signupSchema),
  })

  const onSubmit = async (data: SignupInput) => {
    setIsLoading(true)

    try {
      const response = await fetch("/api/auth/signup", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          email: data.email,
          password: data.password,
          firstName: data.firstName,
          lastName: data.lastName,
        }),
      })

      const result = (await response.json()) as {
        success: boolean
        message?: string
        error?: string
        userId?: string
      }

      if (result.success) {
        toast.success(result.message || "Account created!")
        router.push(
          `/verify-email?email=${encodeURIComponent(data.email)}&userId=${encodeURIComponent(result.userId ?? "")}`
        )
      } else {
        toast.error(result.error || "Signup failed")
      }
    } catch {
      toast.error("An error occurred. Please try again.")
    } finally {
      setIsLoading(false)
    }
  }

  return (
    <form onSubmit={handleSubmit(onSubmit)} className="space-y-4">
      <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
        <div className="space-y-2">
          <Label htmlFor="firstName">First name</Label>
          <Input
            id="firstName"
            type="text"
            placeholder="John"
            autoComplete="given-name"
            className="h-9 text-base"
            {...register("firstName")}
          />
          {errors.firstName && (
            <p className="text-xs text-destructive">
              {errors.firstName.message}
            </p>
          )}
        </div>

        <div className="space-y-2">
          <Label htmlFor="lastName">Last name</Label>
          <Input
            id="lastName"
            type="text"
            placeholder="Doe"
            autoComplete="family-name"
            className="h-9 text-base"
            {...register("lastName")}
          />
          {errors.lastName && (
            <p className="text-xs text-destructive">
              {errors.lastName.message}
            </p>
          )}
        </div>
      </div>

      <div className="space-y-2">
        <Label htmlFor="email">Email</Label>
        <Input
          id="email"
          type="email"
          placeholder="you@example.com"
          autoComplete="email"
          className="h-9 text-base"
          {...register("email")}
        />
        {errors.email && (
          <p className="text-xs text-destructive">{errors.email.message}</p>
        )}
      </div>

      <div className="space-y-2">
        <Label htmlFor="password">Password</Label>
        <PasswordInput
          id="password"
          placeholder="••••••••"
          autoComplete="new-password"
          className="h-9 text-base"
          {...register("password")}
        />
        {errors.password && (
          <p className="text-xs text-destructive">{errors.password.message}</p>
        )}
      </div>

      <div className="space-y-2">
        <Label htmlFor="confirmPassword">Confirm password</Label>
        <PasswordInput
          id="confirmPassword"
          placeholder="••••••••"
          autoComplete="new-password"
          className="h-9 text-base"
          {...register("confirmPassword")}
        />
        {errors.confirmPassword && (
          <p className="text-xs text-destructive">
            {errors.confirmPassword.message}
          </p>
        )}
      </div>

      <Button type="submit" disabled={isLoading} className="h-10 w-full">
        {isLoading ? (
          <>
            <IconLoader className="mr-2 size-4 animate-spin" />
            Creating account...
          </>
        ) : (
          "Create account"
        )}
      </Button>

      <p className="text-center text-sm text-muted-foreground">
        Already have an account?{" "}
        <Link href="/login" className="text-primary hover:underline">
          Sign in
        </Link>
      </p>
    </form>
  );
}