function [error] = tsg_readTsgData( hTsgGUI, filename)
% Function to read the TSG data. Should be a NetCDF file
%
% Input
% -----
% hTsgGUI ............ Handel to the main user interface
% filename ........... Data filename
%
% Output
% ------
% error .............. 1: OK - -1 : an error occured
%
% The data are store using setappdata - Variable name : 'tsg_data'
%
% Function to be rewritten when the NetCDF format will be in use
% Caution : replace the fill-value with NaN
%

% Open the file
% -------------
fid = fopen( filename, 'r' );

error = -1;
if fid ~= -1

    % Read the file
    % -------------
    tsgData = fscanf(fid, '%d/%d/%d %d:%d:%d %f %f %f %f %d %f %f', ...
                     [13 Inf])';
    
    % Every variable are put in a structure
    % -------------------------------------
    tsg.TIME       = datenum(tsgData(:,3), tsgData(:,2),tsgData(:,1), ...
                             tsgData(:,4),tsgData(:,5),tsgData(:,6));
    tsg.LATITUDE   = tsgData(:,7);
    tsg.LONGITUDE  = tsgData(:,8);
    tsg.TEMP_TSG   = tsgData(:,9);
    tsg.PSAL       = tsgData(:,10);
    tsg.PSAL_QC    = tsgData(:,11);
    tsg.PSAL_ADJ   = tsgData(:,12);
    tsg.PSAL_ERR   = tsgData(:,13);
    
    % Save the data in the application GUI
    % ------------------------------------
    setappdata( hTsgGUI, 'tsg_data', tsg );
    
    % Clear the Workspace
    % -------------------
    clear tsgdata
    
    % Close the file
    % --------------
    fclose( fid );
    
    % Everything OK
    % -------------
    error = 1;
end