import React, { useState, useEffect } from 'react';
import { getCurrentUser } from '../api/users.js';

const Settings = () => {
  const [activeTab, setActiveTab] = useState('profile');
  const [currentUser, setCurrentUser] = useState(null);
  const [loading, setLoading] = useState(true);

  // Cargar información del usuario al montar el componente
  useEffect(() => {
    const loadUserData = async () => {
      try {
        const token = localStorage.getItem('access');
        if (token) {
          const userData = await getCurrentUser(token);
          setCurrentUser(userData);
        }
      } catch (error) {
        console.error('Error al cargar datos del usuario:', error);
      } finally {
        setLoading(false);
      }
    };

    loadUserData();
  }, []);

  const tabs = [
    { id: 'profile', name: 'Perfil', icon: 'user' },
    { id: 'organization', name: 'Organización', icon: 'building' },
    { id: 'security', name: 'Seguridad', icon: 'shield' },
    { id: 'notifications', name: 'Notificaciones', icon: 'bell' }
  ];

  const getTabIcon = (iconType) => {
    const icons = {
      user: (
        <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z" />
        </svg>
      ),
      building: (
        <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M19 21V5a2 2 0 00-2-2H7a2 2 0 00-2 2v16m14 0h2m-2 0h-5m-9 0H3m2 0h5M9 7h1m-1 4h1m4-4h1m-1 4h1m-5 10v-5a1 1 0 011-1h2a1 1 0 011 1v5m-4 0h4" />
        </svg>
      ),
      shield: (
        <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M9 12l2 2 4-4m5.618-4.016A11.955 11.955 0 0112 2.944a11.955 11.955 0 01-8.618 3.04A12.02 12.02 0 003 9c0 5.591 3.824 10.29 9 11.622 5.176-1.332 9-6.03 9-11.622 0-1.042-.133-2.052-.382-3.016z" />
        </svg>
      ),
      bell: (
        <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M15 17h5l-5-5v5zM4 4h5l-5 5v-5z" />
        </svg>
      )
    };
    return icons[iconType];
  };

  const renderProfileTab = () => (
    <div className="space-y-6">
      <div>
        <h3 className="text-lg font-medium text-gray-900 mb-4">Información Personal</h3>
        
        {loading ? (
          <div className="animate-pulse space-y-4">
            <div className="flex items-center space-x-4">
              <div className="w-20 h-20 bg-gray-200 rounded-full"></div>
              <div className="space-y-2">
                <div className="h-4 bg-gray-200 rounded w-32"></div>
                <div className="h-3 bg-gray-200 rounded w-24"></div>
              </div>
            </div>
            <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
              <div className="h-10 bg-gray-200 rounded"></div>
              <div className="h-10 bg-gray-200 rounded"></div>
              <div className="h-10 bg-gray-200 rounded"></div>
              <div className="h-10 bg-gray-200 rounded"></div>
            </div>
          </div>
        ) : (
          <>
            {/* Avatar y información básica */}
            <div className="flex items-center space-x-6 mb-6">
              <div className="flex-shrink-0">
                {currentUser?.profile_picture ? (
                  <img
                    className="w-20 h-20 rounded-full object-cover"
                    src={currentUser.profile_picture}
                    alt="Avatar del usuario"
                  />
                ) : (
                  <div className="w-20 h-20 bg-gray-300 rounded-full flex items-center justify-center">
                    <svg className="w-10 h-10 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z" />
                    </svg>
                  </div>
                )}
              </div>
              <div>
                <h4 className="text-lg font-semibold text-gray-900">
                  {currentUser ? `${currentUser.first_name} ${currentUser.last_name}` : 'Usuario'}
                </h4>
                <p className="text-sm text-gray-500">
                  {currentUser?.username || 'Sin username'}
                </p>
                <p className="text-sm text-gray-500">
                  ID: {currentUser?.id || 'Sin ID'}
                </p>
                <button className="mt-2 text-sm text-indigo-600 hover:text-indigo-500">
                  Cambiar foto
                </button>
              </div>
            </div>

            {/* Formulario de información */}
            <div className="grid grid-cols-1 gap-6 sm:grid-cols-2">
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Nombre
                </label>
                <input
                  type="text"
                  defaultValue={currentUser?.first_name || ''}
                  className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 text-sm transition-colors"
                  placeholder="Ingresa tu nombre"
                />
              </div>

              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Apellido
                </label>
                <input
                  type="text"
                  defaultValue={currentUser?.last_name || ''}
                  className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 text-sm transition-colors"
                  placeholder="Ingresa tu apellido"
                />
              </div>

              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Email
                </label>
                <input
                  type="email"
                  defaultValue={currentUser?.email || ''}
                  className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 text-sm transition-colors"
                  placeholder="correo@ejemplo.com"
                />
              </div>

              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Username
                </label>
                <input
                  type="text"
                  defaultValue={currentUser?.username || ''}
                  className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 text-sm transition-colors"
                  placeholder="nombre_usuario"
                />
              </div>

              {currentUser?.rfc && (
                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-2">
                    RFC
                  </label>
                  <input
                    type="text"
                    defaultValue={currentUser.rfc}
                    className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 text-sm transition-colors"
                    placeholder="XXXX000000XXX"
                  />
                </div>
              )}

              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Organización ID
                </label>
                <input
                  type="text"
                  defaultValue={currentUser?.organizacion || ''}
                  disabled
                  className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm bg-gray-50 text-gray-500 cursor-not-allowed text-sm"
                  placeholder="ID de organización"
                />
              </div>
            </div>

            <div className="flex justify-end space-x-3 pt-6 border-t border-gray-200">
              <button
                type="button"
                className="px-4 py-2 border border-gray-300 rounded-md shadow-sm text-sm font-medium text-gray-700 bg-white hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 transition-colors"
              >
                Cancelar
              </button>
              <button
                type="submit"
                className="px-4 py-2 border border-transparent rounded-md shadow-sm text-sm font-medium text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 transition-colors"
              >
                Guardar cambios
              </button>
            </div>
          </>
        )}
      </div>
    </div>
  );

  const renderOrganizationTab = () => (
    <div className="space-y-6">
      <div>
        <h3 className="text-lg font-medium text-gray-900 mb-4">Configuración de Organización</h3>
        <p className="text-sm text-gray-600 mb-6">
          Gestiona la configuración relacionada con tu organización.
        </p>
        
        <div className="bg-yellow-50 border border-yellow-200 rounded-md p-4">
          <div className="flex">
            <div className="flex-shrink-0">
              <svg className="h-5 w-5 text-yellow-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.082 16.5c-.77.833.192 2.5 1.732 2.5z" />
              </svg>
            </div>
            <div className="ml-3">
              <h3 className="text-sm font-medium text-yellow-800">Próximamente</h3>
              <div className="mt-2 text-sm text-yellow-700">
                <p>Las configuraciones de organización estarán disponibles pronto.</p>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  );

  const renderSecurityTab = () => (
    <div className="space-y-6">
      <div>
        <h3 className="text-lg font-medium text-gray-900 mb-4">Seguridad</h3>
        
        <div className="space-y-6">
          <div>
            <h4 className="text-sm font-medium text-gray-900 mb-2">Cambiar contraseña</h4>
            <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Contraseña actual
                </label>
                <input
                  type="password"
                  className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 text-sm transition-colors"
                  placeholder="Ingresa tu contraseña actual"
                />
              </div>
              <div></div>
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Nueva contraseña
                </label>
                <input
                  type="password"
                  className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 text-sm transition-colors"
                  placeholder="Ingresa una nueva contraseña"
                />
              </div>
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Confirmar nueva contraseña
                </label>
                <input
                  type="password"
                  className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 text-sm transition-colors"
                  placeholder="Confirma tu nueva contraseña"
                />
              </div>
            </div>
            <div className="mt-6">
              <button
                type="button"
                className="px-4 py-2 border border-transparent rounded-md shadow-sm text-sm font-medium text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 transition-colors"
              >
                Actualizar contraseña
              </button>
            </div>
          </div>
        </div>
      </div>
    </div>
  );

  const renderNotificationsTab = () => (
    <div className="space-y-6">
      <div>
        <h3 className="text-lg font-medium text-gray-900 mb-4">Notificaciones</h3>
        
        <div className="space-y-4">
          <div className="flex items-center justify-between">
            <div>
              <label className="text-sm font-medium text-gray-900">
                Notificaciones por email
              </label>
              <p className="text-sm text-gray-500">
                Recibir notificaciones importantes por correo electrónico
              </p>
            </div>
            <button
              type="button"
              className="bg-indigo-600 relative inline-flex flex-shrink-0 h-6 w-11 border-2 border-transparent rounded-full cursor-pointer transition-colors ease-in-out duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500"
            >
              <span className="translate-x-5 pointer-events-none inline-block h-5 w-5 rounded-full bg-white shadow transform ring-0 transition ease-in-out duration-200"></span>
            </button>
          </div>

          <div className="flex items-center justify-between">
            <div>
              <label className="text-sm font-medium text-gray-900">
                Notificaciones de documentos
              </label>
              <p className="text-sm text-gray-500">
                Notificar cuando se suban o actualicen documentos
              </p>
            </div>
            <button
              type="button"
              className="bg-indigo-600 relative inline-flex flex-shrink-0 h-6 w-11 border-2 border-transparent rounded-full cursor-pointer transition-colors ease-in-out duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500"
            >
              <span className="translate-x-5 pointer-events-none inline-block h-5 w-5 rounded-full bg-white shadow transform ring-0 transition ease-in-out duration-200"></span>
            </button>
          </div>

          <div className="flex items-center justify-between">
            <div>
              <label className="text-sm font-medium text-gray-900">
                Notificaciones del sistema
              </label>
              <p className="text-sm text-gray-500">
                Recibir actualizaciones del sistema y mantenimiento
              </p>
            </div>
            <button
              type="button"
              className="bg-gray-200 relative inline-flex flex-shrink-0 h-6 w-11 border-2 border-transparent rounded-full cursor-pointer transition-colors ease-in-out duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500"
            >
              <span className="translate-x-0 pointer-events-none inline-block h-5 w-5 rounded-full bg-white shadow transform ring-0 transition ease-in-out duration-200"></span>
            </button>
          </div>
        </div>
      </div>
    </div>
  );

  const renderTabContent = () => {
    switch (activeTab) {
      case 'profile':
        return renderProfileTab();
      case 'organization':
        return renderOrganizationTab();
      case 'security':
        return renderSecurityTab();
      case 'notifications':
        return renderNotificationsTab();
      default:
        return renderProfileTab();
    }
  };

  return (
    <div className="max-w-6xl mx-auto p-6">
      {/* Header */}
      <div className="mb-8">
        <h1 className="text-3xl font-bold text-gray-900">Configuración</h1>
        <p className="mt-2 text-gray-600">
          Gestiona tu perfil, configuración de cuenta y preferencias.
        </p>
      </div>

      <div className="lg:grid lg:grid-cols-12 lg:gap-x-5">
        {/* Sidebar de navegación */}
        <aside className="py-6 px-2 sm:px-6 lg:py-0 lg:px-0 lg:col-span-3">
          <nav className="space-y-1">
            {tabs.map((tab) => (
              <button
                key={tab.id}
                onClick={() => setActiveTab(tab.id)}
                className={`${
                  activeTab === tab.id
                    ? 'bg-indigo-50 border-indigo-500 text-indigo-700'
                    : 'border-transparent text-gray-900 hover:bg-gray-50 hover:text-gray-900'
                } group border-l-4 px-3 py-2 flex items-center text-sm font-medium w-full text-left`}
              >
                <span
                  className={`${
                    activeTab === tab.id
                      ? 'text-indigo-500'
                      : 'text-gray-400 group-hover:text-gray-500'
                  } flex-shrink-0 -ml-1 mr-3 h-6 w-6`}
                >
                  {getTabIcon(tab.icon)}
                </span>
                <span className="truncate">{tab.name}</span>
              </button>
            ))}
          </nav>
        </aside>

        {/* Contenido principal */}
        <div className="space-y-6 sm:px-6 lg:px-0 lg:col-span-9">
          <div className="bg-white shadow rounded-lg">
            <div className="px-4 py-5 sm:p-6">
              {renderTabContent()}
            </div>
          </div>
        </div>
      </div>
    </div>
  );
};

export default Settings;
