function updateTsgStruct(hMainFig)
%
% This function is called after reading data and update tsg structure
% with common values
%
% Input
% -----
% hMainFig ............ Handel to the main user interface
%
% $Id$


% Compute ship velocity from positions if sog not available
% Must be done first as we use getappdata and setappdata within
% the function
% ---------------------------------------------------------
shipVelocity( hMainFig );

% Get the data from the application GUI
% -------------------------------------
tsg = getappdata( hMainFig, 'tsg_data');

nPARA = 2;
PARA  = ['SSPS'; 'SSJT'];

% Get NO_CONTROL and INTERPOLATED_VALUE codes
% -------------------------------------------
NO_CONTROL = get(tsg.qc.hash, 'NO_CONTROL', 'code');

% Suppress longitude discontinuity at -180 or 180 crossing 
% --------------------------------------------------------
dlon=circshift(tsg.LONX,-1)-tsg.LONX;
dlon=dlon(1:end-1);
tsg.indcross=find(abs(dlon)>350);
if ~isempty(tsg.indcross)
    tsg.loncross=sign(dlon(tsg.indcross))*360;
    for i=1:length(tsg.indcross)
        tsg.LONX(tsg.indcross(i)+1:end)=tsg.LONX(tsg.indcross(i)+1:end)-tsg.loncross(i);
    end
end

% get min and max values for position and set to globals attributes
% -----------------------------------------------------------------
tsg.SOUTH_LATX = min(tsg.LATX);
tsg.NORTH_LATX = max(tsg.LATX);
if max(tsg.LONX)>(min(tsg.LONX)+360)
    tsg.WEST_LONX  = -180;
    tsg.EAST_LONX  = 180;
else
    tsg.WEST_LONX  = mod(min(tsg.LONX)+180,360)-180;
    tsg.EAST_LONX  = mod(max(tsg.LONX)+180,360)-180;
end

% get date start and end value and set to globals attributes
% -----------------------------------------------------------------
date           = datestr(min(tsg.DAYD),30);
tsg.DATE_START = [date(1:8) date(10:15)];
date           = datestr(max(tsg.DAYD),30);
tsg.DATE_END   = [date(1:8) date(10:15)];

% Variables must exists
% ---------------------
for i = 1: nPARA

  para1 =  PARA(i,:);
  if ~isempty( tsg.(para1) ) && isempty( tsg.([para1 '_QC']) )

    % If QC variables are emptied, fill them with NO_CONTROL code value
    % -----------------------------------------------------------------
    tsg.([para1 '_QC']) = castByteQC( NO_CONTROL, tsg.DAYD );

  end
end

% Empty variables filled with NaN
% -------------------------------
names = fieldnames( tsg );
for i = 1: length(names)
  para = char( names(i) );
  if ~isstruct(tsg.(para)) && ~isempty(tsg.(para)) && ~iscell(tsg.(para))
    A = tsg.(para);
    ind = find( isnan( A ) == 0 );
    if isempty( ind )
      tsg.(para) = [];
    end
  end
end

% Initialise  'variables_LINCOEF'
% -------------------------------
if isempty(tsg.SSJT_LINCOEF)
  tsg.SSJT_LINCOEF(1) = 1;
  tsg.SSJT_LINCOEF(2) = 0;
end
if isempty(tsg.CNDC_LINCOEF)
  tsg.CNDC_LINCOEF(1) = 1;
  tsg.CNDC_LINCOEF(2) = 0;
end
if isempty(tsg.SSTP_LINCOEF)
  tsg.SSTP_LINCOEF(1) = 1;
  tsg.SSTP_LINCOEF(2) = 0;
end

% Save tsg structure
% ------------------
setappdata( hMainFig, 'tsg_data', tsg);

end