import { useState, useEffect } from "react";
import { ProfileService } from "../services/profile.service";
import { useAuth } from "../context/AuthContext";
import { AuthService } from "../services/auth.service";
import {
  NotificationPreferencesService,
  type NotificationPreferences,
} from "../services/notification-preferences.service";

export default function PerfilPage() {
  const { user, refreshSession } = useAuth();
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);

  const [showEmailModal, setShowEmailModal] = useState(false);
  const [newEmail, setNewEmail] = useState("");
  const [authCode, setAuthCode] = useState(""); // Código Google Authenticator
  const [loadingEmail, setLoadingEmail] = useState(false);

  const [formData, setFormData] = useState({
    firstName: "",
    lastName: "",
    phoneNumber: "",
  });

  // Estado de preferencias de notificación
  const [notifPrefs, setNotifPrefs] = useState<NotificationPreferences>({
    sistema:     true,
    marketing:   true,
    rendimiento: true,
    mensajes:    true,
  });
  const [savingPrefs, setSavingPrefs] = useState(false);
  const [prefsSaved, setPrefsSaved] = useState(false);
  const [loadingPrefs, setLoadingPrefs] = useState(true);

  useEffect(() => {
    loadProfile();
    loadNotifPrefs();
  }, []);

  const loadNotifPrefs = async () => {
    try {
      const data = await NotificationPreferencesService.getPreferences();
      setNotifPrefs(data);
    } catch (err) {
      console.error("Error cargando preferencias de notificación", err);
    } finally {
      setLoadingPrefs(false);
    }
  };

  const handleSaveNotifPrefs = async () => {
    setSavingPrefs(true);
    try {
      await NotificationPreferencesService.updatePreferences(notifPrefs);
      setPrefsSaved(true);
      setTimeout(() => setPrefsSaved(false), 3000);
    } catch (err) {
      alert("Error al guardar las preferencias de notificación.");
    } finally {
      setSavingPrefs(false);
    }
  };

  const loadProfile = async () => {
    try {
      const data = await ProfileService.getProfile();
      setFormData({
        firstName: data.firstName || "",
        lastName: data.lastName || "",
        phoneNumber: data.phoneNumber || "",
      });
    } catch (err) {
      console.error("Error loading profile", err);
    } finally {
      setLoading(false);
    }
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setSaving(true);
    try {
      await ProfileService.updateProfile(formData);
      alert("Perfil actualizado con éxito");
      if (refreshSession) refreshSession();
    } catch (err) {
      alert("Error al actualizar el perfil");
    } finally {
      setSaving(false);
    }
  };

  if (loading) {
    return (
      <div className="flex justify-center p-40">
        <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-500"></div>
      </div>
    );
  }

  return (
    <div className="container mx-auto px-6 py-12 max-w-4xl">
      <div className="mb-12">
        <h1 className="text-5xl font-black tracking-tighter uppercase mb-2">
          Mi <span className="text-blue-500">Perfil</span>
        </h1>
        <p className="text-gray-500 font-bold tracking-widest uppercase text-xs">
          Gestiona tu información personal
        </p>
      </div>

      <div className="grid grid-cols-1 lg:grid-cols-3 gap-8">
        {/* Sidebar Info */}
        <div className="lg:col-span-1 space-y-6">
          <div className="glass p-8 rounded-[2rem] border border-white/5 text-center">
            <div className="w-24 h-24 bg-blue-600/20 rounded-full flex items-center justify-center text-4xl text-blue-400 font-bold mx-auto mb-4 border border-blue-500/20 shadow-lg shadow-blue-500/10">
              {user?.username?.[0].toUpperCase()}
            </div>
            <h2 className="text-xl font-black text-white uppercase tracking-tight">
              {user?.username}
            </h2>
            <p className="text-xs text-gray-500 font-medium mb-6">
              {user?.email}
            </p>

            <div className="flex flex-col gap-2">
              <span
                className={`px-4 py-1.5 rounded-full text-[10px] font-black uppercase tracking-widest ${user?.userType === 3 ? "bg-amber-500/10 text-amber-500 border border-amber-500/20" : "bg-blue-600/10 text-blue-400 border border-blue-600/20"}`}
              >
                {user?.userType === 3
                  ? "🛡️ Administrador"
                  : "👤 Usuario Particular"}
              </span>
            </div>
          </div>
        </div>

        {/* Formulario de datos personales */}
        <div className="lg:col-span-2">
          <form
            onSubmit={handleSubmit}
            className="glass p-8 rounded-[2.5rem] border border-white/5 space-y-8"
          >
            <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
              <div className="space-y-2">
                <label className="text-[10px] font-black uppercase tracking-widest text-gray-500 ml-1">
                  Nombre
                </label>
                <input
                  type="text"
                  value={formData.firstName}
                  onChange={(e) =>
                    setFormData({ ...formData, firstName: e.target.value })
                  }
                  className="w-full bg-white/5 border border-white/10 rounded-2xl px-5 py-4 text-sm text-white outline-none focus:border-blue-500 transition-all font-medium"
                  placeholder="Tu nombre"
                />
              </div>

              <div className="space-y-2">
                <label className="text-[10px] font-black uppercase tracking-widest text-gray-500 ml-1">
                  Apellido
                </label>
                <input
                  type="text"
                  value={formData.lastName}
                  onChange={(e) =>
                    setFormData({ ...formData, lastName: e.target.value })
                  }
                  className="w-full bg-white/5 border border-white/10 rounded-2xl px-5 py-4 text-sm text-white outline-none focus:border-blue-500 transition-all font-medium"
                  placeholder="Tu apellido"
                />
              </div>

              <div className="space-y-2 md:col-span-2">
                <label className="text-[10px] font-black uppercase tracking-widest text-gray-500 ml-1">
                  Teléfono de Contacto
                </label>
                <input
                  type="text"
                  value={formData.phoneNumber}
                  onChange={(e) =>
                    setFormData({ ...formData, phoneNumber: e.target.value })
                  }
                  className="w-full bg-white/5 border border-white/10 rounded-2xl px-5 py-4 text-sm text-white outline-none focus:border-blue-500 transition-all font-medium"
                  placeholder="Ej: +54 9 11 1234 5678"
                />
              </div>

              <div className="space-y-2 md:col-span-2">
                <label className="text-[10px] font-black uppercase tracking-widest text-gray-500 ml-1">
                  Email
                </label>
                <div className="flex gap-2">
                  <input
                    type="email"
                    value={user?.email}
                    disabled
                    className="flex-1 bg-white/5 border border-white/10 rounded-2xl px-5 py-4 text-sm text-gray-500 outline-none cursor-not-allowed font-medium"
                  />
                  <button
                    type="button"
                    onClick={() => {
                      if (!user?.isMFAEnabled) {
                        alert(
                          "⚠️ Acción restringida.\n\nPara cambiar tu email, primero debes activar la Autenticación de Dos Factores (2FA) en la sección de Seguridad.",
                        );
                        return;
                      }
                      setShowEmailModal(true);
                    }}
                    className="bg-white/5 hover:bg-blue-600 hover:text-white border border-white/10 text-gray-300 px-6 rounded-2xl text-[10px] font-black uppercase tracking-widest transition-all"
                  >
                    Cambiar
                  </button>
                </div>
              </div>
            </div>

            <div className="pt-6 border-t border-white/5">
              <button
                type="submit"
                disabled={saving}
                className="w-full md:w-auto bg-blue-600 hover:bg-blue-500 text-white py-4 px-12 rounded-2xl text-[10px] font-black uppercase tracking-widest transition-all shadow-lg shadow-blue-600/20 active:scale-95 disabled:opacity-50"
              >
                {saving ? "Guardando..." : "Guardar Cambios"}
              </button>
            </div>
          </form>

          {/* ─── Preferencias de Notificación ─── */}
          <div className="mt-8 glass p-8 rounded-[2.5rem] border border-white/5">
            <div className="flex items-center gap-3 mb-6">
              <div className="w-10 h-10 bg-blue-600/15 rounded-2xl flex items-center justify-center text-xl border border-blue-500/20">
                🔔
              </div>
              <div>
                <h3 className="text-sm font-black uppercase tracking-widest text-white">
                  Preferencias de Notificación
                </h3>
                <p className="text-[10px] text-gray-500 font-medium mt-0.5">
                  Elegir qué correos querés recibir
                </p>
              </div>
            </div>

            {loadingPrefs ? (
              <div className="flex items-center gap-3 py-4 text-gray-500 text-xs">
                <div className="w-5 h-5 border-2 border-blue-500/40 border-t-blue-500 rounded-full animate-spin" />
                Cargando preferencias...
              </div>
            ) : (
              <div className="space-y-4">
                {([
                  {
                    key: "sistema" as const,
                    label: "Avisos del Sistema",
                    desc: "Vencimiento de avisos, renovaciones y alertas importantes.",
                    icon: "⚙️",
                  },
                  {
                    key: "marketing" as const,
                    label: "Promociones y Marketing",
                    desc: "Ofertas especiales, recordatorio de carrito abandonado.",
                    icon: "🎁",
                  },
                  {
                    key: "rendimiento" as const,
                    label: "Resumen Semanal",
                    desc: "Visitas y favoritos de tus avisos publicados.",
                    icon: "📊",
                  },
                  {
                    key: "mensajes" as const,
                    label: "Recordatorio de Mensajes",
                    desc: "Aviso cuando tenés mensajes sin leer por más de 4 horas.",
                    icon: "💬",
                  },
                ] as const).map(({ key, label, desc, icon }) => (
                  <label
                    key={key}
                    className="flex items-center justify-between gap-4 p-4 rounded-2xl bg-white/3
                      border border-white/5 hover:bg-white/5 transition-all cursor-pointer group"
                  >
                    <div className="flex items-center gap-3">
                      <span className="text-xl">{icon}</span>
                      <div>
                        <p className="text-xs font-black text-white uppercase tracking-wider">
                          {label}
                        </p>
                        <p className="text-[10px] text-gray-500 font-medium mt-0.5">{desc}</p>
                      </div>
                    </div>

                    {/* Toggle switch */}
                    <div className="relative flex-shrink-0">
                      <input
                        type="checkbox"
                        className="sr-only"
                        checked={notifPrefs[key]}
                        onChange={(e) =>
                          setNotifPrefs((prev) => ({ ...prev, [key]: e.target.checked }))
                        }
                      />
                      <div
                        className={`w-12 h-6 rounded-full transition-all duration-300 cursor-pointer
                          ${notifPrefs[key]
                            ? 'bg-blue-600 shadow-lg shadow-blue-600/30'
                            : 'bg-white/10'}`}
                      >
                        <div
                          className={`absolute top-1 w-4 h-4 bg-white rounded-full shadow transition-all duration-300
                            ${notifPrefs[key] ? 'left-7' : 'left-1'}`}
                        />
                      </div>
                    </div>
                  </label>
                ))}

                <div className="pt-4 border-t border-white/5 flex items-center gap-4">
                  <button
                    type="button"
                    onClick={handleSaveNotifPrefs}
                    disabled={savingPrefs}
                    className="bg-blue-600 hover:bg-blue-500 text-white py-3.5 px-10 rounded-2xl
                      text-[10px] font-black uppercase tracking-widest transition-all
                      shadow-lg shadow-blue-600/20 active:scale-95 disabled:opacity-50"
                  >
                    {savingPrefs ? "Guardando..." : "Guardar Preferencias"}
                  </button>

                  {prefsSaved && (
                    <span className="text-green-400 text-[10px] font-black uppercase tracking-widest
                      animate-pulse">
                      ✓ Preferencias guardadas
                    </span>
                  )}
                </div>
              </div>
            )}
          </div>
        </div>
      </div>
      {showEmailModal && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 backdrop-blur-md p-4 animate-fade-in">
          <div className="glass p-8 rounded-[2.5rem] border border-white/10 max-w-md w-full relative shadow-2xl animate-scale-up">
            <button
              onClick={() => setShowEmailModal(false)}
              className="absolute top-6 right-6 text-gray-500 hover:text-white font-bold"
            >
              ✕
            </button>

            <div className="text-center mb-6">
              <div className="w-16 h-16 bg-blue-600/10 rounded-2xl flex items-center justify-center text-2xl mx-auto mb-4 border border-blue-500/20 text-blue-400">
                📧
              </div>
              <h3 className="text-2xl font-black text-white uppercase tracking-tighter">
                Cambiar Email
              </h3>
              <p className="text-xs text-gray-400 mt-2 font-medium">
                Ingresa tu nueva dirección y valida con tu autenticador.
              </p>
            </div>

            <div className="space-y-5">
              <div>
                <label className="text-[9px] font-black uppercase tracking-widest text-gray-500 block mb-2 ml-1">
                  Nuevo Correo Electrónico
                </label>
                <input
                  type="email"
                  placeholder="nuevo@email.com"
                  value={newEmail}
                  onChange={(e) => setNewEmail(e.target.value)}
                  className="w-full bg-black/40 border border-white/10 rounded-xl px-4 py-3 text-white text-sm outline-none focus:border-blue-500 transition-all placeholder:text-gray-700"
                />
              </div>

              <div>
                <label className="text-[9px] font-black uppercase tracking-widest text-gray-500 block mb-2 ml-1">
                  Código Authenticator (2FA)
                </label>
                <input
                  type="text"
                  maxLength={6}
                  placeholder="000 000"
                  value={authCode}
                  onChange={(e) =>
                    setAuthCode(e.target.value.replace(/\D/g, ""))
                  }
                  className="w-full bg-black/40 border border-white/10 rounded-xl px-4 py-3 text-white text-center font-mono text-xl tracking-[0.3em] outline-none focus:border-blue-500 transition-all placeholder:text-gray-700 placeholder:tracking-normal"
                />
              </div>

              <button
                onClick={async () => {
                  if (newEmail === user?.email) {
                    alert("El nuevo email debe ser diferente al actual.");
                    return;
                  }
                  try {
                    setLoadingEmail(true);
                    const res = await AuthService.initiateEmailChange(
                      newEmail,
                      authCode,
                    );
                    alert(res.message); // "Se ha enviado un enlace..."
                    setShowEmailModal(false);
                    setNewEmail("");
                    setAuthCode("");
                  } catch (err: any) {
                    alert(
                      err.response?.data?.message ||
                        "Error al solicitar cambio.",
                    );
                  } finally {
                    setLoadingEmail(false);
                  }
                }}
                disabled={
                  loadingEmail || newEmail.length < 5 || authCode.length < 6
                }
                className="w-full bg-blue-600 hover:bg-blue-500 text-white py-4 rounded-xl font-bold uppercase tracking-widest text-xs shadow-lg shadow-blue-600/20 transition-all disabled:opacity-50 disabled:cursor-not-allowed hover:scale-[1.02]"
              >
                {loadingEmail ? "Procesando..." : "Enviar Confirmación"}
              </button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}