function o = rename_(o, old, new) % --*-- Unitary tests --*--

% Renames variables in a dseries object.
%
% INPUTS
% - o     [dseries]
% - old   [string, cell]
% - new   [string, cell]
%
% OUTPUTS
% - o     [dseries]

% Copyright (C) 2013-2017 Dynare Team
%
% This file is part of Dynare.
%
% Dynare 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
% (at your option) any later version.
%
% Dynare 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.

if isempty(o)
    error('dseries::rename: Cannot rename variable(s) because the object is empty!')
end

if nargin<3
    if isequal(vobs(o), 1) || isequal(vobs(o), length(old))
        new = old;
    else
        error('dseries::rename: Missing argument!')
    end
    if ~ischar(new) && ~(iscellstr(new) && isequal(vobs(o), length(new)))
        error(['dseries::rename: Input argument ''' ...
               inputname(2) ...
               ''' has to be either a string or a cellstring that has the same number of entries as observed variables!'])
    end
    idname = 1;
else
    if ~ischar(old) || ~ischar(new)
        error(['dseries::rename: Input arguments ''' inputname(2) ''' and ''' inputname(3) '''  have to be strings!'])
    end
    idname = find(strcmp(old,o.name));
    if isempty(idname)
        error(['dseries::rename: Variable ' old ' is unknown in dseries object ' inputname(1)  '!'])
    end
end

if iscellstr(new)
    o.name = new(:);
else
    o.name(idname) = {new};
end

%@test:1
%$ ts = dseries([transpose(1:5), transpose(6:10)],'1950q1',{'Output'; 'Consumption'}, {'Y_t'; 'C_t'});
%$ try
%$     ts.rename_('Output','Production');
%$     t(1) = 1;
%$ catch
%$     t(1) = 0;
%$ end
%$
%$ if t(1)>1
%$     t(2) = dassert(ts.freq,4);
%$     t(3) = dassert(ts.init.freq,4);
%$     t(4) = dassert(ts.init.time,[1950, 1]);
%$     t(5) = dassert(ts.vobs,2);
%$     t(6) = dassert(ts.nobs,5);
%$     t(7) = dassert(ts.name,{'Production'; 'Consumption'});
%$     t(8) = dassert(ts.tex,{'Y_t'; 'C_t'});
%$ end
%$
%$ T = all(t);
%@eof:1

%@test:2
%$ ts = dseries(randn(10,1));
%$ try
%$     ts.rename_('Dora');
%$     t(1) = 1;
%$ catch
%$     t(1) = 0;
%$ end
%$
%$ if t(1)>1
%$     t(2) = dassert(ts.name,{'Dora'});
%$ end
%$
%$ T = all(t);
%@eof:2

%@test:3
%$ ts = dseries(randn(10,3));
%$ try
%$     ts.rename_({'Dora', 'The', 'Explorer'});
%$     t(1) = 1;
%$ catch
%$     t(1) = 0;
%$ end
%$
%$ if t(1)
%$     t(2) = dassert(ts.name, {'Dora', 'The', 'Explorer'});
%$     t(3) = size(ts.name, 1)==3;
%$     t(4) = size(ts.name, 2)==1;
%$ end
%$
%$ T = all(t);
%@eof:3