neroshitron/app/login/page.tsx

import Link from "next/link";
import { headers } from "next/headers";
import { createClient } from "@/utils/supabase/server";
import { redirect } from "next/navigation";
import { SubmitButton } from "./submit-button";

export default function Login({
  searchParams,
}: {
  searchParams: { message: string };
}) {
  const signIn = async (formData: FormData) => {
    "use server";

    const email = formData.get("email") as string;
    const password = formData.get("password") as string;
    const supabase = createClient();

    const { error } = await supabase.auth.signInWithPassword({
      email,
      password,
    });

    if (error) {
      return redirect("/login?message=Could not authenticate user");
    }

    return redirect("/protected");
  };

  const signUp = async (formData: FormData) => {
    "use server";

    const origin = headers().get("origin");
    const email = formData.get("email") as string;
    const password = formData.get("password") as string;
    const supabase = createClient();

    const { error } = await supabase.auth.signUp({
      email,
      password,
      options: {
        emailRedirectTo: `${origin}/auth/callback`,
      },
    });

    if (error) {
      return redirect("/login?message=Could not authenticate user");
    }

    return redirect("/login?message=Check email to continue sign in process");
  };

  return (
    <div className="flex-1 flex flex-col w-full px-8 sm:max-w-md justify-center gap-2">

      <form className="animate-in flex-1 flex flex-col w-full my-32 gap-2 text-foreground">

      <Link
          href="/"
          className="absolute left-1 top-44 py-2 px-4 rounded-md no-underline text-foreground bg-btn-background hover:bg-btn-background-hover flex items-center group text-sm"
        >
          <svg
            xmlns="http://www.w3.org/2000/svg"
            width="24"
            height="24"
            viewBox="0 0 24 24"
            fill="none"
            stroke="currentColor"
            strokeWidth="2"
            strokeLinecap="round"
            strokeLinejoin="round"
            className="mr-2 h-4 w-4 transition-transform group-hover:-translate-x-1"
          >
            <polyline points="15 18 9 12 15 6" />
          </svg>{" "}
          Back
        </Link>
        <input
          className="rounded-md px-4 py-2 bg-inherit border mb-2 mx-1"
          name="email"
          placeholder="Email Address"
          required
        />
        <input
          className="rounded-md px-4 py-2 bg-inherit border mb-2 mx-1"
          type="password"
          name="password"
          placeholder="Password "
          required
        />
        <div className="flex">
          <SubmitButton
            formAction={signIn}
            className="bg-green-700 rounded-md px-4 py-2 text-foreground mb-2 mx-1 w-1/2"
            pendingText="Signing In..."
          >
            Sign In
          </SubmitButton>
          <SubmitButton
            formAction={signUp}
            className="border border-foreground/20 rounded-md px-4 py-2 text-foreground mb-2 mx-1 w-1/2"
            pendingText="Signing Up..."
          >
            Sign Up
          </SubmitButton>
        </div>
        {searchParams?.message && (
          <p className="mt-4 bg-foreground/10 mt-12 p-2 text-foreground text-center">
            {searchParams.message}
          </p>
        )}
      </form>
    </div>
  );
}