'use client';

import { useEffect, useMemo, useState } from 'react';
import { useRouter } from 'next/navigation';

/**
 * Onboarding persistence key.
 * If you later want this to come from env/config, move it to apps/web/config/onboarding.ts
 */
const STORAGE_KEY = 'horux360:onboarding_seen_v1';

export default function OnboardingScreen() {
  const router = useRouter();
  const [isNewUser, setIsNewUser] = useState(true);
  const [loading, setLoading] = useState(false);

  const safePush = (path: string) => {
    // Avoid multiple navigations if user clicks quickly.
    if (loading) return;
    setLoading(true);
    router.push(path);
  };

  useEffect(() => {
    const seen = typeof window !== 'undefined' && localStorage.getItem(STORAGE_KEY) === '1';

    // If the user has already seen onboarding, go to dashboard automatically.
    if (seen) {
      setIsNewUser(false);
      setLoading(true);
      const t = setTimeout(() => router.push('/dashboard'), 900);
      return () => clearTimeout(t);
    }
  }, [router]);

  const handleContinue = () => {
    if (typeof window !== 'undefined') localStorage.setItem(STORAGE_KEY, '1');
    setLoading(true);
    setTimeout(() => router.push('/dashboard'), 700);
  };

  const handleReset = () => {
    if (typeof window !== 'undefined') localStorage.removeItem(STORAGE_KEY);
    location.reload();
  };

  const headerStatus = useMemo(() => (isNewUser ? 'Onboarding' : 'Redirección'), [isNewUser]);

  return (
    <main className="min-h-screen relative overflow-hidden bg-white">
      {/* Grid tech claro */}
      <div
        className="absolute inset-0 opacity-[0.05]"
        style={{
          backgroundImage:
            'linear-gradient(to right, rgba(15,23,42,.2) 1px, transparent 1px), linear-gradient(to bottom, rgba(15,23,42,.2) 1px, transparent 1px)',
          backgroundSize: '48px 48px',
        }}
      />

      {/* Glow global azul (sutil) */}
      <div className="absolute -top-24 left-1/2 h-72 w-[42rem] -translate-x-1/2 rounded-full bg-blue-500/20 blur-3xl" />

      <div className="relative z-10 flex min-h-screen items-center justify-center p-6">
        <div className="w-full max-w-4xl">
          <div className="rounded-2xl border border-slate-200 bg-white shadow-xl overflow-hidden">
            {/* Header */}
            <div className="flex items-center justify-between px-6 py-4 border-b border-slate-200">
              <div className="flex items-center gap-3">
                <div className="h-9 w-9 rounded-xl bg-blue-600/10 border border-blue-500/30 flex items-center justify-center">
                  <div className="h-2.5 w-2.5 rounded-full bg-blue-500" />
                </div>
                <div className="leading-tight">
                  <p className="text-sm font-semibold text-slate-800">Horux360</p>
                  <p className="text-xs text-slate-500">Pantalla de inicio</p>
                </div>
              </div>

              <span className="text-xs text-slate-500">{headerStatus}</span>
            </div>

            {/* Body */}
            <div className="p-6 md:p-8">
              {isNewUser ? (
                <div className="grid gap-8 md:grid-cols-2 md:items-center">
                  {/* Left */}
                  <div>
                    <h1 className="text-2xl md:text-3xl font-semibold text-slate-900">
                      Bienvenido a Horux360
                    </h1>
                    <p className="mt-2 text-sm md:text-base text-slate-600 max-w-md">
                      Revisa este breve video para conocer el flujo. Después podrás continuar.
                    </p>

                    <div className="mt-6 flex items-center gap-3">
                      <button
                        onClick={handleContinue}
                        disabled={loading}
                        className="bg-blue-600 disabled:opacity-60 disabled:cursor-not-allowed text-white px-6 py-3 rounded-xl font-semibold shadow-md hover:bg-blue-700 hover:shadow-lg transition-all"
                      >
                        {loading ? 'Cargando…' : 'Continuar'}
                      </button>

                      <button
                        onClick={() => safePush('/login')}
                        disabled={loading}
                        className="px-5 py-3 rounded-xl font-medium text-slate-700 border border-slate-300 hover:bg-slate-100 transition disabled:opacity-60 disabled:cursor-not-allowed"
                      >
                        Ver más
                      </button>
                    </div>

                    <div className="mt-6 text-xs text-slate-500">
                      Usuario nuevo: muestra video • Usuario recurrente: redirección automática
                    </div>
                  </div>

                  {/* Right (video) - elegante sin glow */}
                  <div className="relative">
                    <div className="rounded-2xl border border-slate-200 bg-white shadow-sm">
                      <div className="h-1 w-full rounded-t-2xl bg-gradient-to-r from-blue-600/80 via-blue-500/40 to-transparent" />
                      <div className="p-3">
                        <div className="rounded-xl border border-slate-200 bg-slate-50 overflow-hidden">
                          <video src="/video-intro.mp4" controls className="w-full rounded-xl" />
                        </div>

                        <div className="mt-3 flex items-center justify-between text-xs text-slate-500">
                          <span className="flex items-center gap-2">
                            <span className="inline-block h-2 w-2 rounded-full bg-blue-500" />
                            Video introductorio
                          </span>
                          <span>v1</span>
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              ) : (
                <div className="py-12 flex flex-col items-center justify-center text-center">
                  <div className="h-12 w-12 rounded-2xl bg-blue-600/10 border border-blue-500/30 flex items-center justify-center">
                    <div className="h-3 w-3 rounded-full bg-blue-500 animate-pulse" />
                  </div>
                  <h2 className="mt-5 text-lg font-semibold text-slate-800">
                    Redirigiendo al dashboard…
                  </h2>
                  <p className="mt-2 text-sm text-slate-600">Usuario recurrente detectado.</p>

                  <div className="mt-6 w-full max-w-sm h-2 rounded-full bg-slate-200 overflow-hidden border border-slate-300">
                    <div className="h-full w-2/3 bg-blue-600/80 animate-pulse" />
                  </div>

                  <button
                    onClick={handleReset}
                    className="mt-6 text-xs text-slate-500 hover:text-slate-700 underline underline-offset-4"
                  >
                    Ver video otra vez (reset demo)
                  </button>
                </div>
              )}
            </div>
          </div>

          <p className="mt-4 text-center text-xs text-slate-400">
            Demo UI sin backend • Persistencia local: localStorage
          </p>
        </div>
      </div>
    </main>
  );
}
