"use client";

import Image from "next/image";
import { FormEvent, useState } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import { api, type SessionUser } from "@/lib/api";

export function LoginForm({
  variant,
  tenantSlug,
}: {
  variant: "admin" | "tenant";
  tenantSlug?: string;
}) {
  const router = useRouter();
  const search = useSearchParams();
  const oauthError = {
    google_off: "Entrar com o Google está indisponível no momento.",
    google_unlinked: "Este e-mail Google não tem acesso à administração.",
    google_denied: "Não foi possível entrar com o Google.",
  }[search.get("error") ?? ""];
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

  async function onSubmit(event: FormEvent) {
    event.preventDefault();
    setError("");
    setLoading(true);
    try {
      const result = await api<{ user: SessionUser }>("/api/auth/login", {
        method: "POST",
        body: JSON.stringify({
          email,
          password,
          tenantSlug: variant === "tenant" ? tenantSlug : undefined,
        }),
      });
      const next = search.get("next");
      if (result.user.kind === "platform") {
        router.replace(next?.startsWith("/admin") ? next : "/admin");
        return;
      }
      const home = `/${result.user.tenantSlug}`;
      router.replace(next?.startsWith(home) ? next : home);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Falha no login.");
    } finally {
      setLoading(false);
    }
  }

  return (
    <main className="flex min-h-dvh flex-col bg-black text-[#E8F4E5]">
      <div className="mx-auto flex w-full max-w-md flex-1 flex-col justify-center px-6 py-16">
        <a href="/" className="mb-10 block w-fit">
          <Image
            src="/brand/sinka-logo.webp"
            alt="Sinka"
            width={180}
            height={58}
            className="h-8 w-auto"
            priority
          />
        </a>
        <p className="text-xs font-semibold uppercase tracking-[0.28em] text-[#82C85C]">
          {variant === "admin" ? "Administração" : "Operação"}
        </p>
        <h1 className="font-display mt-2 text-4xl font-extrabold uppercase leading-none">
          {variant === "admin" ? "Administração Sinka" : "Entrar"}
        </h1>
        <p className="mt-4 text-[#E8F4E5]/60">
          {variant === "admin"
            ? "Crie e acompanhe os clientes da Sinka."
            : "Entre com e-mail e senha, ou com o Google."}
        </p>

        <form className="mt-8 flex flex-col gap-4" onSubmit={onSubmit}>
          <label className="flex flex-col gap-2 text-sm">
            E-mail
            <input
              className="rounded-xl border border-white/10 bg-white/5 px-4 py-3 outline-none focus:border-[#82C85C]"
              type="email"
              value={email}
              onChange={(event) => setEmail(event.target.value)}
              required
              autoComplete="username"
            />
          </label>
          <label className="flex flex-col gap-2 text-sm">
            Senha
            <input
              className="rounded-xl border border-white/10 bg-white/5 px-4 py-3 outline-none focus:border-[#82C85C]"
              type="password"
              value={password}
              onChange={(event) => setPassword(event.target.value)}
              required
              autoComplete="current-password"
            />
          </label>
          {error || oauthError ? <p className="text-sm text-red-300">{error || oauthError}</p> : null}
          <button className="btn-sinka mt-2 justify-center" disabled={loading} type="submit">
            {loading ? "Entrando…" : "Entrar"}
          </button>
        </form>
        <p className="mt-5 text-center text-xs uppercase tracking-[0.2em] text-[#E8F4E5]/35">ou</p>
        <a
          className="btn-google mt-4"
          href={`/api/auth/google${
            variant === "tenant"
              ? `?tenant=${encodeURIComponent(tenantSlug ?? "")}&next=${encodeURIComponent(`/${tenantSlug}`)}`
              : "?next=/admin"
          }`}
        >
          <svg width="18" height="18" viewBox="0 0 18 18" aria-hidden>
            <path
              fill="#4285F4"
              d="M17.64 9.2c0-.637-.057-1.251-.164-1.84H9v3.481h4.844c-.209 1.125-.843 2.078-1.796 2.717v2.258h2.908c1.702-1.567 2.684-3.874 2.684-6.615z"
            />
            <path
              fill="#34A853"
              d="M9 18c2.43 0 4.467-.806 5.956-2.184l-2.908-2.258c-.806.54-1.837.86-3.048.86-2.344 0-4.328-1.584-5.036-3.711H.957v2.332C2.438 15.983 5.482 18 9 18z"
            />
            <path
              fill="#FBBC05"
              d="M3.964 10.707c-.18-.54-.282-1.117-.282-1.707s.102-1.167.282-1.707V4.961H.957C.348 6.175 0 7.55 0 9s.348 2.825.957 4.039l3.007-2.332z"
            />
            <path
              fill="#EA4335"
              d="M9 3.58c1.321 0 2.508.454 3.44 1.345l2.582-2.58C13.463.891 11.426 0 9 0 5.482 0 2.438 2.017.957 4.961L3.964 7.29C4.672 5.163 6.656 3.58 9 3.58z"
            />
          </svg>
          Entrar com o Google
        </a>
      </div>
    </main>
  );
}