function D = driving_function_mono_sdm_ls(x0,nk,f,conf)
%DRIVING_FUNCTION_MONO_SDM_LS driving signal for a line source in SDM
%
%   Usage: D = driving_function_mono_sdm_ls(x0,nk,f,conf)
%
%   Input parameters:
%       x0          - position of the secondary sources / m [nx3]
%       nk          - position of virtual line source / m [nx3]
%       f           - frequency of the monochromatic source / Hz
%       conf        - configuration struct (see SFS_config)
%
%   Output parameters:
%       D           - driving function signal [nx1]
%
%   See also: driving_function_mono_sdm

%*****************************************************************************
% The MIT License (MIT)                                                      *
%                                                                            *
% Copyright (c) 2010-2019 SFS Toolbox Developers                             *
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% methods like wave field synthesis or higher order ambisonics.              *
%                                                                            *
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%*****************************************************************************


%% ===== Checking of input  parameters ==================================
nargmin = 4;
nargmax = 4;
narginchk(nargmin,nargmax);
isargmatrix(x0,nk);
isargpositivescalar(f);
isargstruct(conf);


%% ===== Configuration ==================================================
xref = conf.xref;
c = conf.c;
dimension = conf.dimension;
driving_functions = conf.driving_functions;


%% ===== Computation ====================================================
% Calculate the driving function in time-frequency domain

% Frequency
omega = 2*pi*f;


if strcmp('2D',dimension)

    % === 2-Dimensional ==================================================

    % Ensure 2D
    x0 = x0(:,1:2);
    nk = nk(:,1:2);

    switch driving_functions
    case 'default'
        % --- SFS Toolbox ------------------------------------------------
        to_be_implemented;
    otherwise
        error(['%s: %s, this type of driving function is not implemented ', ...
            'for a 2D line source.'],upper(mfilename),driving_functions);
    end


elseif strcmp('2.5D',dimension)

    % === 2.5-Dimensional ================================================

    % Reference point
    xref = repmat(xref,[size(x0,1) 1]);

    switch driving_functions
    case 'default'
        % --- SFS Toolbox ------------------------------------------------
        to_be_implemented;
    otherwise
        error(['%s: %s, this type of driving function is not implemented ', ...
            'for a 2.5D line source.'],upper(mfilename),driving_functions);
    end


elseif strcmp('3D',dimension)

    % === 3-Dimensional ==================================================

    switch driving_functions
    case 'default'
        % --- SFS Toolbox ------------------------------------------------
        to_be_implemented;
    otherwise
        error(['%s: %s, this type of driving function is not implemented ', ...
            'for a 3D line source.'],upper(mfilename),driving_functions);
    end

else
    error('%s: the dimension %s is unknown.',upper(mfilename),dimension);
end
