"use client";

import { useState } from "react";
import Link from "next/link";
import { useRouter } from "next/navigation";
import { UserPlusIcon } from "lucide-react";
import { authClient } from "@/lib/auth-client";
import { Alert, AlertDescription } from "@/components/ui/alert";
import { Button } from "@/components/ui/button";
import { Field, FieldDescription, FieldGroup, FieldLabel } from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import { Spinner } from "@/components/ui/spinner";

export function SignUpForm({
  callbackURL,
  requireInvite,
  initialCode = "",
}: {
  callbackURL: string;
  requireInvite: boolean;
  initialCode?: string;
}) {
  const router = useRouter();
  const [name, setName] = useState("");
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [inviteCode, setInviteCode] = useState(initialCode);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  async function submit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (requireInvite && !inviteCode.trim()) {
      setError("An invite code is required");
      return;
    }
    setLoading(true);
    setError(null);
    const result = await authClient.signUp.email({
      name,
      email,
      password,
      callbackURL,
    });
    if (result.error) {
      setError(result.error.message ?? "Unable to create account");
      setLoading(false);
      return;
    }
    if (inviteCode.trim()) {
      router.push(`/invitations/${encodeURIComponent(inviteCode.trim())}`);
      router.refresh();
      return;
    }
    router.push(callbackURL);
    router.refresh();
  }

  return (
    <form className="flex flex-col gap-5" onSubmit={submit}>
      <FieldGroup>
        <Field>
          <FieldLabel htmlFor="name">Name</FieldLabel>
          <Input
            id="name"
            autoComplete="name"
            required
            value={name}
            onChange={(event) => setName(event.target.value)}
            className="tap-target"
          />
        </Field>
        <Field>
          <FieldLabel htmlFor="email">Email</FieldLabel>
          <Input
            id="email"
            type="email"
            autoComplete="email"
            required
            value={email}
            onChange={(event) => setEmail(event.target.value)}
            className="tap-target"
          />
        </Field>
        <Field>
          <FieldLabel htmlFor="password">Password</FieldLabel>
          <Input
            id="password"
            type="password"
            autoComplete="new-password"
            minLength={process.env.NODE_ENV === "production" ? 10 : 5}
            required
            value={password}
            onChange={(event) => setPassword(event.target.value)}
            className="tap-target"
          />
          <FieldDescription>Use at least 10 characters in production.</FieldDescription>
        </Field>
        {initialCode.length > 4 ? <p className="text-sm text-muted-foreground">Your invitation is attached. You’ll confirm your access after creating your account.</p> : <Field>
          <FieldLabel htmlFor="invite">
            Invite code {requireInvite ? "" : "(optional)"}
          </FieldLabel>
          <Input
            id="invite"
            value={inviteCode}
            onChange={(event) =>
              setInviteCode(event.target.value.toUpperCase().replace(/[^A-Z0-9]/g, ""))
            }
            placeholder="AB12"
            minLength={4}
            maxLength={4}
            pattern="[A-Za-z0-9]{4}"
            autoCapitalize="characters"
            autoCorrect="off"
            className="tap-target"
            required={requireInvite}
          />
        </Field>}
      </FieldGroup>
      {error ? (
        <Alert variant="destructive">
          <AlertDescription>{error}</AlertDescription>
        </Alert>
      ) : null}
      <Button type="submit" size="lg" className="tap-target w-full" disabled={loading}>
        {loading ? (
          <Spinner data-icon="inline-start" />
        ) : (
          <UserPlusIcon data-icon="inline-start" />
        )}
        Create account
      </Button>
      <p className="text-center text-sm text-muted-foreground">
        Already have an account?{" "}
        <Link
          href={`/sign-in?callbackURL=${encodeURIComponent(callbackURL)}`}
          className="font-medium text-primary hover:underline"
        >
          Sign in
        </Link>
      </p>
    </form>
  );
}