"use client";

import {
  AlertCircle,
  ArrowRight,
  CheckCircle2,
  Eye,
  EyeOff,
  Loader2,
  LockKeyhole,
  Mail,
  ShieldCheck,
} from "lucide-react";
import { useRouter } from "next/navigation";
import Link from "next/link";
import { useEffect, useState } from "react";
import { loginUser, getSessionToken } from "@/services/auth-service";
import { Button } from "@/components/ui/button";
import { Card } from "@/components/ui/card";
import { Input } from "@/components/ui/input";

export default function LoginPage() {
  const router = useRouter();

  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [showPassword, setShowPassword] = useState(false);

  const [isLoading, setIsLoading] = useState(false);
  const [errorMsg, setErrorMsg] = useState<string | null>(null);
  const [successMsg, setSuccessMsg] = useState<string | null>(null);

  // Se já há sessão ativa, redireciona direto para o dashboard
  useEffect(() => {
    if (getSessionToken()) {
      router.replace("/");
    }
  }, [router]);

  const handleLogin = async (e: React.FormEvent) => {
    e.preventDefault();
    setErrorMsg(null);
    setSuccessMsg(null);

    if (!email.trim() || !password.trim()) {
      setErrorMsg("Por favor, preencha o e-mail e a senha.");
      return;
    }

    setIsLoading(true);
    try {
      await loginUser({ email, password });
      setSuccessMsg("Autenticação realizada com sucesso! Redirecionando...");
      setTimeout(() => {
        router.push("/");
      }, 800);
    } catch (err: any) {
      setErrorMsg(err.message || "Erro ao efetuar login. Verifique suas credenciais.");
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <main className="grid min-h-screen bg-background lg:grid-cols-[0.9fr_1.1fr]">
      {/* Seção Esquerda: Formulário de Autenticação */}
      <section className="flex items-center justify-center px-6 py-10">
        <div className="w-full max-w-md space-y-6">
          {/* Logo e Título */}
          <div>
            <div className="flex items-center gap-3">
              <div className="flex h-12 w-12 items-center justify-center rounded-xl bg-primary text-xl font-black text-primary-foreground shadow-md">
                BL
              </div>
              <div>
                <h2 className="text-xl font-bold tracking-tight text-foreground">BlackLoc</h2>
                <p className="text-xs text-muted-foreground">Sistema de Gestão para Locadoras</p>
              </div>
            </div>
            <h1 className="mt-8 text-2xl font-bold tracking-tight text-foreground sm:text-3xl">
              Acesse sua Conta
            </h1>
            <p className="mt-1.5 text-sm text-muted-foreground">
              Entre com suas credenciais para gerenciar frotas, contratos e financeiro.
            </p>
          </div>

          {/* Banner de Mensagem de Erro / Sucesso */}
          {errorMsg && (
            <div className="flex items-center gap-2.5 rounded-lg border border-rose-500/30 bg-rose-500/10 p-3 text-xs font-medium text-rose-600 dark:text-rose-400">
              <AlertCircle className="h-4 w-4 shrink-0" />
              <span>{errorMsg}</span>
            </div>
          )}

          {successMsg && (
            <div className="flex items-center gap-2.5 rounded-lg border border-emerald-500/30 bg-emerald-500/10 p-3 text-xs font-medium text-emerald-600 dark:text-emerald-400">
              <CheckCircle2 className="h-4 w-4 shrink-0" />
              <span>{successMsg}</span>
            </div>
          )}

          {/* Card do Formulário */}
          <Card className="p-6 shadow-xl border">
            <form onSubmit={handleLogin} className="space-y-4" autoComplete="off">
              {/* E-mail */}
              <div>
                <label className="mb-1.5 block text-xs font-semibold text-foreground">
                  E-mail corporativo *
                </label>
                <div className="relative">
                  <Mail className="pointer-events-none absolute left-3 top-3 h-4 w-4 text-muted-foreground" />
                  <Input
                    type="email"
                    value={email}
                    onChange={(e) => setEmail(e.target.value)}
                    className="pl-9 text-sm"
                    placeholder="admin@rentx.local"
                    autoComplete="one-time-code"
                    required
                  />
                </div>
              </div>

              {/* Senha com alternância de visibilidade */}
              <div>
                <div className="flex items-center justify-between mb-1.5">
                  <label className="block text-xs font-semibold text-foreground">
                    Senha de acesso *
                  </label>
                  <Link href="/recuperar-senha" className="text-xs font-semibold text-primary hover:underline">
                    Esqueceu a senha?
                  </Link>
                </div>
                <div className="relative">
                  <LockKeyhole className="pointer-events-none absolute left-3 top-3 h-4 w-4 text-muted-foreground" />
                  <Input
                    type={showPassword ? "text" : "password"}
                    value={password}
                    onChange={(e) => setPassword(e.target.value)}
                    className="pl-9 pr-10 text-sm"
                    placeholder="Digite sua senha"
                    autoComplete="new-password"
                    required
                  />
                  <button
                    type="button"
                    onClick={() => setShowPassword(!showPassword)}
                    className="absolute right-3 top-3 text-muted-foreground hover:text-foreground"
                    title={showPassword ? "Ocultar senha" : "Exibir senha"}
                  >
                    {showPassword ? <EyeOff className="h-4 w-4" /> : <Eye className="h-4 w-4" />}
                  </button>
                </div>
              </div>

              {/* Botões de Ação */}
              <Button type="submit" disabled={isLoading} className="w-full h-11 text-sm font-semibold shadow-xs">
                {isLoading ? (
                  <>
                    <Loader2 className="mr-2 h-4 w-4 animate-spin" /> Autenticando...
                  </>
                ) : (
                  <>
                    Entrar no Sistema <ArrowRight className="ml-2 h-4 w-4" />
                  </>
                )}
              </Button>

            </form>
          </Card>
        </div>
      </section>

      {/* Seção Direita: Painel Visual com Imagem Industrial */}
      <section className="relative hidden overflow-hidden bg-slate-950 lg:block">
        <img
          src="https://images.unsplash.com/photo-1504917595217-d4dc5ebe6122?auto=format&fit=crop&w=1400&q=80"
          alt="Frota de equipamentos de construção civil e mineração"
          className="h-full w-full object-cover opacity-60 transition-transform duration-700 hover:scale-105"
        />
        <div className="absolute inset-0 bg-gradient-to-t from-slate-950 via-slate-950/50 to-slate-950/20" />

        <div className="absolute bottom-12 left-12 right-12 text-white space-y-6">
          <div className="inline-flex items-center gap-2 rounded-full border border-blue-400/30 bg-blue-500/20 px-3.5 py-1 text-xs font-semibold tracking-wider uppercase text-blue-300 backdrop-blur-md">
            <ShieldCheck className="h-4 w-4 text-blue-400" /> BlackLoc Cloud v2.0
          </div>

          <h2 className="max-w-xl text-3xl font-extrabold leading-tight tracking-tight sm:text-4xl text-white">
            Escavadeiras, guindastes, plataformas e geradores em uma operação 100% conectada.
          </h2>

          <p className="max-w-lg text-sm text-slate-300 leading-relaxed">
            Controle de contratos, emissão de faturas no financeiro, manutenção preventiva da frota e relatórios gerenciais em tempo real.
          </p>

          <div className="flex flex-wrap gap-2 pt-2">
            {[
              "Escavadeiras & Tratores",
              "Geradores de Energia",
              "Plataformas Elevatórias",
              "Torres de Iluminação",
              "Compressores & Ferramentas",
            ].map((item) => (
              <span
                key={item}
                className="rounded-lg border border-white/20 bg-white/10 px-3 py-1 text-xs font-medium backdrop-blur-sm text-slate-200"
              >
                {item}
              </span>
            ))}
          </div>
        </div>
      </section>
    </main>
  );
}