function num = struct2latex(data,xname,downsample,filtertype,filename,postfix,options)
%------------------------------------------------
%2010/09/14 version 1.0
%num = struct2latex(data,xname,downsample,filename,postfix,options)
%Function to export a matlabstruct to a tex-file for using NumericPlots. 
%xname, downsample, filename, postfix and options are optional parameters.
%struct2latex is based on the function export2latex.
%------------------------------------------------
%output:
%num        ...number of y-data exported
%input:
%data       ...datastruct
%xname      ...name of the x-Axis
%downsample ...downsampling factor (optional, default = 1)
%filtertype ...using filtering data {'none','MinMax','Hull'}(optional, default = 'none')
%filename   ...name of the tex-file (optional, default io)
%postfix    ...postfix for fieldnames in the tex-file (optional, default '')
%options    ...options for export2latex (optional)
%

% author: Alexander Michel
% date: 2010/08/09
% changed by Alexander Michel: 
%    2010/09/14 mapping of column-vectors 
%    2010/09/14 postfix option added
%    2012/08/03 filters added
%    2013/06/26 data consistency check added
%    2013/08/09 data consistency check for x-vector dimension added
%               bugfixing of mapping of column-vectors
%               bugfixing of fnamesExcludelist
%
% Copyright 2010 Thomas König, Alexander Michel
%
% This file is part of NumericPlots.
%
% NumericPlots is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% any later version.
% 
% NumericPlots is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with NumericPlots.  If not, see <http://www.gnu.org/licenses/>.


%choose x-Axis
allfnames = fieldnames(data);
if(nargin<2)    
    [xnamenum,selected] = listdlg('PromptString','Choose x-Axis:','SelectionMode','single','ListString',allfnames(1:end));
    if (selected==0)
        error('No x-Axis chosen!');
    end
    xname = allfnames{xnamenum};
end

%exclude special fields from export
fnamesExcludelist = {xname,'dSPACESettings'};
kk = 1;
for ii = 1:length(allfnames)
    if(~strcmp(allfnames{ii},fnamesExcludelist))
        fnames{kk} = allfnames{ii};
        kk = kk+1;
    end
end


% check x data consistency and
% convert to column vectors if necessary
[nor,noc] = size(data.(xname));
if(nor>1)
     if(noc>1)
         error('struct2latex supports only vectors as x-vectors');
     else
         data.(xname) = data.(xname)';
     end
end  

% check y data consistency and
% convert to column vectors if necessary
for ii = 1:length(fnames)
    [nor,noc] = size(data.(fnames{ii}));
    if(nor>1)
         if(noc>1)
             error('struct2latex supports only vectors as y-vectors');
         else
             data.(fnames{ii}) = data.(fnames{ii})';
         end
    end  
    if(length(data.(xname))~=length(data.(fnames{ii})))
        error(['Error in ' fnames{ii} '! Only vectors of the same length are supported!']);
    end 
end

%downsample
if(nargin<3)
    downsample = 1;
end
idx = 1:downsample:length(data.(xname));

%downsample
if(nargin<4)
    filtertype = 'none';
end


%postfix
if(nargin<6)
    postfix = '';
end

if(length(idx)>5000)
    buttonname = questdlg('Warning! Number of points exceeds 5000! It is recommended to increase the downsampling factor!','Increase the downsampling factor?','Yes','No','Yes');
    switch buttonname
        case 'Yes'
            dlgoptions.Resize='on';
            dlgoptions.WindowStyle='normal';
            dlgoptions.Interpreter='tex';
            defans{1} = num2str(ceil(length(data.(xname))/5000));
            answer = inputdlg('Downsampling factor','Input Downsampling factor',1,defans,dlgoptions);
            downsample = str2num(answer{1});
            idx = 1:downsample:length(data.(xname));
        case 'No'
            warning('number of points exceeds 5000');
    end
end


% get x-data
xbuffer = data.(xname);
[nor,noc] = size(xbuffer);
if(nor>1)
     if(noc>1)
         error('struct2latex supports only vectors');
     else
         xbuffer = xbuffer';
     end
end

% get y-data
latexfnames = genlatexnames(fnames);
for ii = 1:length(fnames)   
    ybuffer = data.(fnames{ii});      
    switch(filtertype)
        case{'none'}
            ydata = ybuffer(idx);
            xdata = xbuffer(idx);
        case{'MinMax'}
            [xdata,ydata] = LatexFilterMinMax(xbuffer,ybuffer,floor(length(idx)/2));
        case{'Hull'}
            [xdata,ydata] = LatexFilterHull(xbuffer,ybuffer,floor(length(idx)/2));
        otherwise
            ydata = ybuffer(idx);
            xdata = xbuffer(idx);
    end
    texdata(ii).x = xdata;
    texdata(ii).y = ydata;
    texdata(ii).ident = [latexfnames{ii} postfix];
end

if(nargin<4)
    [texname,texpname] = uiputfile('*.tex','Save Tex-File as ...','data');
    filename = [texpname texname(1:end-4)];
end
if(ischar(filename))
    if(exist('options','var'))
        export2latex(texdata,filename,options);
    else
        export2latex(texdata,filename);
    end
else
    error('no savefile chosen or illegal name');
end

% output info
num = length(fnames);
disp([num2str(length(fnames)) ' data sets exported.']);
disp(['x-data name:']);
disp(['''' xname '''']);
disp(['y-data name:']);
for ii=1:length(latexfnames)
    fprintf(['''' latexfnames{ii} '''' ' ']);
end
fprintf(['\n']);