function indent = sbvar_global_identification_check(options_)
% function sbvar_global_identification_check(options_.ms)
%
% INPUTS
%    options_ms:    (struct)    options
%
% OUTPUTS
%    ident:          (boolean) false = not identified; true = identified
%
% SPECIAL REQUIREMENTS
%    none

% Copyright (C) 2015 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/>.

ident = false;

if isequal(options_.ms.restriction_fname, 'upper_cholesky') || ...
        isequal(options_.ms.restriction_fname, 'lower_cholesky')
    ident = true;
    if ~options_.noprint
        disp(' ')
        disp('SBVAR: Cholesky identification is always identified')
        disp(' ')
    end
    return
end
nvar = length(options_.varobs);   % number of endogenous variables
nexo = 1;
   
[Uiconst,Viconst,n0,np,ixmC0Pres,Qi] = exclusions(nvar,nexo,options_.ms );

% order column constraints by rank
Qranks = zeros(nvar,2);
for j=1:nvar
    Qranks(j,:) = [j,rank(Qi{j})];
end
Qranks = sortrows(Qranks,-2);

ident = true;

for j=1:nvar
    i = Qranks(j,1);
    for k=1:1
        M = [Qi{i}*rand(size(Qi{i},1),nvar);[eye(j) zeros(j,nvar- ...
                                                          j)]];
        disp([j,k,rank(M)])
        if rank(M) < nvar
            ident = false
            break
        end
    end
end

if ~options_.noprint
    disp(' ')
    if ident
        disp('The sufficient condition for SBVAR identification is met')
    else
        disp('WARNGING: The sufficient condition for SBVAR identification is not met')
    end
    disp(' ')
end