% CHAR convert a pzmodel object into a string.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DESCRIPTION: CHAR convert a pzmodel object into a string.
%
% CALL:        string = char(pzmodel)
%
% <a href="matlab:utils.helper.displayMethodInfo('pzmodel', 'char')">Parameters Description</a>
%
% VERSION:     $Id: char.m,v 1.18 2011/04/08 08:56:32 hewitson Exp $
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function varargout = char(varargin)
  
  %%% Check if this is a call for parameters
  if utils.helper.isinfocall(varargin{:})
    varargout{1} = getInfo(varargin{3});
    return
  end
  
  objs = utils.helper.collect_objects(varargin(:), 'pzmodel');
  
  pstr = '';
  
  for ii = 1:numel(objs)
    if numel(objs(ii).poles(:))==0||numel(objs(ii).zeros(:))==0||numel(objs(ii).gain(:))==0
      pole='no pole';
      zero='no zero';
      K='no gain';
    else
      poles= vertcat(objs(ii).poles(:).ri);
      zeros= vertcat(objs(ii).zeros(:).ri);
      K=utils.math.getk(zeros,poles,objs(ii).gain);
      pole=num2str(poles(1));
      zero=num2str(zeros(1));
      for i=2:numel(poles)
        pole= [pole, ';', num2str(poles(i))];
      end
      for i=2:numel(zeros)
        zero= [zero,  ';' , num2str(zeros(i))];
      end
    end
    pstr = [pstr 'pzmodel(g:' num2str(K) ' p:' pole ' z:' zero '), '];
  end
  
  varargout{1} = pstr(1:end-2);
end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                               Local Functions                               %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% FUNCTION:    getInfo
%
% DESCRIPTION: Get Info Object
%
% HISTORY:     11-07-07 M Hewitson
%                Creation.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function ii = getInfo(varargin)
  if nargin == 1 && strcmpi(varargin{1}, 'None')
    sets = {};
    pl   = [];
  else
    sets = {'Default'};
    pl   = getDefaultPlist;
  end
  % Build info object
  ii = minfo(mfilename, 'pzmodel', 'ltpda', utils.const.categories.output, '$Id: char.m,v 1.18 2011/04/08 08:56:32 hewitson Exp $', sets, pl);
  ii.setModifier(false);
end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% FUNCTION:    getDefaultPlist
%
% DESCRIPTION: Get Default Plist
%
% HISTORY:     11-07-07 M Hewitson
%                Creation.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function plout = getDefaultPlist()
  persistent pl;  
  if exist('pl', 'var')==0 || isempty(pl)
    pl = buildplist();
  end
  plout = pl;  
end

function pl = buildplist()
  pl = plist.EMPTY_PLIST;
end