import { useState } from 'react';
import {
  Users as UsersIcon,
  Plus,
  MoreVertical,
  Eye,
  Edit2,
  Trash2,
  Key,
  Mail,
  RefreshCw,
  Search,
  UserCheck,
  UserX,
  Shield,
} from 'lucide-react';
import { Button } from '@components/atoms/Button';
import { Card, CardHeader, CardTitle, CardContent } from '@components/molecules/Card';
import { DataTable, type Column } from '@components/organisms/DataTable';
import { Dropdown, type DropdownItem } from '@components/organisms/Dropdown';
import { Breadcrumbs } from '@components/organisms/Breadcrumbs';
import { ConfirmModal } from '@components/organisms/Modal';
import { NoDataEmptyState, ErrorEmptyState } from '@components/templates/EmptyState';
import { useUsers } from '@features/settings/hooks';
import type { User, UserRole } from '@features/settings/types';
import { USER_ROLE_LABELS } from '@features/settings/types';
import { formatDate } from '@utils/formatters';

const roleColors: Record<UserRole, string> = {
  admin: 'bg-red-100 text-red-700',
  manager: 'bg-blue-100 text-blue-700',
  user: 'bg-green-100 text-green-700',
  viewer: 'bg-gray-100 text-gray-700',
};

export function UsersSettingsPage() {
  const [searchTerm, setSearchTerm] = useState('');
  const [selectedRole, setSelectedRole] = useState<UserRole | ''>('');
  const [showActiveOnly, setShowActiveOnly] = useState<boolean | undefined>(undefined);
  const [userToDelete, setUserToDelete] = useState<User | null>(null);
  const [userToToggle, setUserToToggle] = useState<User | null>(null);
  const [userToResetPassword, setUserToResetPassword] = useState<User | null>(null);

  const {
    users,
    total,
    page,
    totalPages,
    isLoading,
    error,
    setFilters,
    refresh,
    remove,
    toggleActive,
    resetPassword,
    resendInvitation,
  } = useUsers({
    initialFilters: {
      search: searchTerm,
      role: selectedRole || undefined,
      isActive: showActiveOnly,
    },
  });

  const handleSearch = (value: string) => {
    setSearchTerm(value);
    setFilters({ search: value });
  };

  const handleRoleFilter = (role: UserRole | '') => {
    setSelectedRole(role);
    setFilters({ role: role || undefined });
  };

  const handleActiveFilter = (active: boolean | undefined) => {
    setShowActiveOnly(active);
    setFilters({ isActive: active });
  };

  const columns: Column<User>[] = [
    {
      key: 'name',
      header: 'Usuario',
      render: (user) => (
        <div className="flex items-center gap-3">
          <div className="flex h-10 w-10 items-center justify-center rounded-full bg-blue-100">
            {user.avatarUrl ? (
              <img src={user.avatarUrl} alt={user.name} className="h-10 w-10 rounded-full object-cover" />
            ) : (
              <span className="text-sm font-medium text-blue-600">
                {user.name.split(' ').map(n => n[0]).join('').toUpperCase().slice(0, 2)}
              </span>
            )}
          </div>
          <div>
            <div className="font-medium text-gray-900">{user.name}</div>
            <div className="text-sm text-gray-500">{user.email}</div>
          </div>
        </div>
      ),
    },
    {
      key: 'role',
      header: 'Rol',
      render: (user) => (
        <span className={`inline-flex items-center gap-1 rounded-full px-2 py-1 text-xs font-medium ${roleColors[user.role]}`}>
          <Shield className="h-3 w-3" />
          {USER_ROLE_LABELS[user.role]}
        </span>
      ),
    },
    {
      key: 'isActive',
      header: 'Estado',
      render: (user) => (
        <span className={`inline-flex items-center gap-1 rounded-full px-2 py-1 text-xs font-medium ${
          user.isActive ? 'bg-green-100 text-green-700' : 'bg-gray-100 text-gray-600'
        }`}>
          {user.isActive ? (
            <>
              <UserCheck className="h-3 w-3" />
              Activo
            </>
          ) : (
            <>
              <UserX className="h-3 w-3" />
              Inactivo
            </>
          )}
        </span>
      ),
    },
    {
      key: 'lastLoginAt',
      header: 'Ultimo acceso',
      render: (user) => (
        <span className="text-sm text-gray-600">
          {user.lastLoginAt ? formatDate(user.lastLoginAt, 'short') : 'Nunca'}
        </span>
      ),
    },
    {
      key: 'createdAt',
      header: 'Creado',
      render: (user) => (
        <span className="text-sm text-gray-600">
          {formatDate(user.createdAt, 'short')}
        </span>
      ),
    },
    {
      key: 'actions',
      header: '',
      render: (user) => {
        const items: DropdownItem[] = [
          {
            key: 'view',
            label: 'Ver detalle',
            icon: <Eye className="h-4 w-4" />,
            onClick: () => console.log('View', user.id),
          },
          {
            key: 'edit',
            label: 'Editar',
            icon: <Edit2 className="h-4 w-4" />,
            onClick: () => console.log('Edit', user.id),
          },
          {
            key: 'toggle',
            label: user.isActive ? 'Desactivar' : 'Activar',
            icon: user.isActive ? <UserX className="h-4 w-4" /> : <UserCheck className="h-4 w-4" />,
            onClick: () => setUserToToggle(user),
          },
          {
            key: 'resetPassword',
            label: 'Restablecer contrasena',
            icon: <Key className="h-4 w-4" />,
            onClick: () => setUserToResetPassword(user),
          },
          {
            key: 'resendInvitation',
            label: 'Reenviar invitacion',
            icon: <Mail className="h-4 w-4" />,
            onClick: () => resendInvitation(user.id),
          },
          {
            key: 'delete',
            label: 'Eliminar',
            icon: <Trash2 className="h-4 w-4" />,
            danger: true,
            onClick: () => setUserToDelete(user),
          },
        ];

        return (
          <Dropdown
            trigger={
              <button className="rounded p-1 hover:bg-gray-100">
                <MoreVertical className="h-4 w-4 text-gray-500" />
              </button>
            }
            items={items}
            align="right"
          />
        );
      },
    },
  ];

  const handleDeleteUser = async () => {
    if (userToDelete) {
      await remove(userToDelete.id);
      setUserToDelete(null);
    }
  };

  const handleToggleUser = async () => {
    if (userToToggle) {
      await toggleActive(userToToggle.id);
      setUserToToggle(null);
    }
  };

  const handleResetPassword = async () => {
    if (userToResetPassword) {
      // Generate a temporary password or show a form
      const tempPassword = 'TempPass123!';
      await resetPassword(userToResetPassword.id, tempPassword);
      setUserToResetPassword(null);
      alert(`Contrasena restablecida. Nueva contrasena temporal: ${tempPassword}`);
    }
  };

  // Stats
  const activeUsers = users.filter(u => u.isActive).length;
  const adminCount = users.filter(u => u.role === 'admin').length;
  const managerCount = users.filter(u => u.role === 'manager').length;

  if (error) {
    return (
      <div className="p-6">
        <ErrorEmptyState onRetry={refresh} />
      </div>
    );
  }

  return (
    <div className="space-y-6 p-6">
      <Breadcrumbs items={[
        { label: 'Configuracion', href: '/settings' },
        { label: 'Usuarios' },
      ]} />

      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-gray-900">Usuarios</h1>
          <p className="text-sm text-gray-500">
            Gestiona los usuarios de tu empresa
          </p>
        </div>
        <div className="flex gap-2">
          <Button variant="outline" onClick={refresh} disabled={isLoading}>
            <RefreshCw className={`mr-2 h-4 w-4 ${isLoading ? 'animate-spin' : ''}`} />
            Actualizar
          </Button>
          <Button>
            <Plus className="mr-2 h-4 w-4" />
            Nuevo usuario
          </Button>
        </div>
      </div>

      {/* Summary Stats */}
      <div className="grid grid-cols-1 gap-4 sm:grid-cols-4">
        <Card>
          <CardContent className="p-4">
            <div className="flex items-center gap-3">
              <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-blue-100">
                <UsersIcon className="h-5 w-5 text-blue-600" />
              </div>
              <div>
                <div className="text-sm text-gray-500">Total usuarios</div>
                <div className="text-xl font-bold text-blue-600">{total}</div>
              </div>
            </div>
          </CardContent>
        </Card>

        <Card className="cursor-pointer hover:shadow-md transition-shadow" onClick={() => handleActiveFilter(true)}>
          <CardContent className="p-4">
            <div className="flex items-center gap-3">
              <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-green-100">
                <UserCheck className="h-5 w-5 text-green-600" />
              </div>
              <div>
                <div className="text-sm text-gray-500">Activos</div>
                <div className="text-xl font-bold text-green-600">{activeUsers}</div>
              </div>
            </div>
          </CardContent>
        </Card>

        <Card className="cursor-pointer hover:shadow-md transition-shadow" onClick={() => handleRoleFilter('admin')}>
          <CardContent className="p-4">
            <div className="flex items-center gap-3">
              <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-red-100">
                <Shield className="h-5 w-5 text-red-600" />
              </div>
              <div>
                <div className="text-sm text-gray-500">Administradores</div>
                <div className="text-xl font-bold text-red-600">{adminCount}</div>
              </div>
            </div>
          </CardContent>
        </Card>

        <Card className="cursor-pointer hover:shadow-md transition-shadow" onClick={() => handleRoleFilter('manager')}>
          <CardContent className="p-4">
            <div className="flex items-center gap-3">
              <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-purple-100">
                <UsersIcon className="h-5 w-5 text-purple-600" />
              </div>
              <div>
                <div className="text-sm text-gray-500">Gerentes</div>
                <div className="text-xl font-bold text-purple-600">{managerCount}</div>
              </div>
            </div>
          </CardContent>
        </Card>
      </div>

      <Card>
        <CardHeader>
          <CardTitle>Lista de Usuarios</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="space-y-4">
            {/* Filters */}
            <div className="flex flex-wrap items-center gap-4">
              <div className="relative flex-1 min-w-[200px]">
                <Search className="absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-gray-400" />
                <input
                  type="text"
                  placeholder="Buscar usuarios..."
                  value={searchTerm}
                  onChange={(e) => handleSearch(e.target.value)}
                  className="w-full rounded-md border border-gray-300 py-2 pl-10 pr-4 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500"
                />
              </div>

              <select
                value={selectedRole}
                onChange={(e) => handleRoleFilter(e.target.value as UserRole | '')}
                className="rounded-md border border-gray-300 px-3 py-2 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500"
              >
                <option value="">Todos los roles</option>
                {Object.entries(USER_ROLE_LABELS).map(([value, label]) => (
                  <option key={value} value={value}>{label}</option>
                ))}
              </select>

              <select
                value={showActiveOnly === undefined ? '' : showActiveOnly.toString()}
                onChange={(e) => handleActiveFilter(e.target.value === '' ? undefined : e.target.value === 'true')}
                className="rounded-md border border-gray-300 px-3 py-2 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500"
              >
                <option value="">Todos los estados</option>
                <option value="true">Activos</option>
                <option value="false">Inactivos</option>
              </select>

              {(searchTerm || selectedRole || showActiveOnly !== undefined) && (
                <Button
                  variant="ghost"
                  size="sm"
                  onClick={() => {
                    setSearchTerm('');
                    setSelectedRole('');
                    setShowActiveOnly(undefined);
                    setFilters({});
                  }}
                >
                  Limpiar filtros
                </Button>
              )}
            </div>

            {/* Table */}
            {users.length === 0 && !isLoading ? (
              <NoDataEmptyState entityName="usuarios" />
            ) : (
              <DataTable
                data={users}
                columns={columns}
                isLoading={isLoading}
                pagination={{
                  page,
                  totalPages,
                  total,
                  limit: 20,
                  onPageChange: (p) => setFilters({ page: p }),
                }}
              />
            )}
          </div>
        </CardContent>
      </Card>

      {/* Delete User Modal */}
      <ConfirmModal
        isOpen={!!userToDelete}
        onClose={() => setUserToDelete(null)}
        onConfirm={handleDeleteUser}
        title="Eliminar usuario"
        message={`¿Eliminar al usuario "${userToDelete?.name}"? Esta accion no se puede deshacer.`}
        variant="danger"
        confirmText="Eliminar"
      />

      {/* Toggle User Modal */}
      <ConfirmModal
        isOpen={!!userToToggle}
        onClose={() => setUserToToggle(null)}
        onConfirm={handleToggleUser}
        title={userToToggle?.isActive ? 'Desactivar usuario' : 'Activar usuario'}
        message={userToToggle?.isActive
          ? `¿Desactivar al usuario "${userToToggle?.name}"? No podra acceder al sistema.`
          : `¿Activar al usuario "${userToToggle?.name}"? Podra acceder al sistema nuevamente.`
        }
        variant={userToToggle?.isActive ? 'warning' : 'success'}
        confirmText={userToToggle?.isActive ? 'Desactivar' : 'Activar'}
      />

      {/* Reset Password Modal */}
      <ConfirmModal
        isOpen={!!userToResetPassword}
        onClose={() => setUserToResetPassword(null)}
        onConfirm={handleResetPassword}
        title="Restablecer contrasena"
        message={`¿Restablecer la contrasena de "${userToResetPassword?.name}"? Se generara una contrasena temporal.`}
        variant="warning"
        confirmText="Restablecer"
      />
    </div>
  );
}

export default UsersSettingsPage;