function plot_ms_irf(M_, options_, irf, figure_name, varlist)
% function plot_ms_irf(M_, options_, irf, figure_name, varlist)
% plots the impulse responses from the output from a ms-sbvar
%
% INPUTS
%    M_:          (struct)    model structure
%    options_:    (struct)    options
%    irf:         (matrix)    in the form (percentile x horizon x (nvar x nvar)), if banded otherwise
%                             ( horizon x (nvar x nvar) )
%    figure_name: (string)    title
%
% OUTPUTS
%    none
%
% SPECIAL REQUIREMENTS
%    none

% Copyright © 2011-2018 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 <https://www.gnu.org/licenses/>.

if nargin < 4
    figure_name = '';
end

nvars = M_.endo_nbr;
endo_names = M_.endo_names;

if isempty(varlist)
    var_list = endo_names(1:M_.orig_endo_nbr);
end

names = {};
tex_names = {};
m = 1;
for i = 1:length(var_list)
    tmp = strmatch(var_list{i}, endo_names, 'exact');
    if isempty(tmp)
        error([var_list{i} ' isn''t and endogenous variable'])
    end
    tex_name = M_.endo_names_tex{tmp};
    if ~isempty(tex_name)
        names{m} = var_list{i};
        tex_names{m} = tex_name;
        m = m + 1;
    end
end

for i=1:M_.exo_nbr
    tex_name = M_.exo_names_tex{i};
    if ~isempty(tex_name)
        names{m} = M_.exo_names{i};
        tex_names{m} = tex_name;
        m = m + 1;
    end
end

dims = size(irf);
if (length(dims) == 2)
    % Point IRF (horizon x (nvarsxnvars) )
    horizon = dims(1);
    num_percentiles = 1;
elseif (length(dims) == 3)
    % Banded IRF
    horizon = dims(2);
    num_percentiles = dims(1);
else
    error('The impulse response matrix passed to be plotted does not appear to be the correct size');
end

if length(endo_names) ~= nvars
    error('The names passed are not the same length as the number of variables');
end

if num_percentiles == 1
    % loop through the shocks
    for s=1:nvars
        shock = zeros(horizon,nvars);
        for i=1:nvars
            shock(:,i) = irf(:,((i-1) + ((s-1)*nvars)+1));
        end
        plot_point_irf_for_shock(shock, nvars,endo_names, endo_names{s}, ...
                                 figure_name, [options_.ms.output_file_tag filesep 'Output' filesep 'IRF'], options_, names, tex_names);
    end
else
    for s=1:nvars
        shock = zeros(horizon,nvars,num_percentiles);
        for n=1:num_percentiles
            for i=1:nvars
                shock(:,i,n) = irf(n,:,((i-1) + ((s-1)*nvars)+1));
            end
        end
        plot_banded_irf_for_shock(shock, nvars,endo_names, endo_names{s}, ...
                                  figure_name, [options_.ms.output_file_tag filesep 'Output' filesep 'IRF'], options_, names, tex_names);
    end
end
end

function [fig] = plot_point_irf_for_shock(irf,nvars,endo_names,shock_name,figure_name,dirname,options_,names,tex_names)
fig = figure('Name',figure_name);
for k=1:nvars
    subplot(ceil(sqrt(nvars)), ceil(sqrt(nvars)),k);
    plot(irf(:,k))
    disp([endo_names{k} ' shock from ' shock_name]);
    title([endo_names{k} ' shock from ' shock_name]);
end
dyn_save_graph(dirname,[figure_name ' ' shock_name],options_.graph_save_formats, ...
               options_.TeX,names,tex_names,[figure_name ' ' shock_name]);
end

function [fig] = plot_banded_irf_for_shock(irf,nvars, endo_names, shock_name,figure_name,dirname,options_,names,tex_names)
fig = figure('Name',figure_name);
npercentiles = size(irf,3);
for k=1:nvars
    subplot(ceil(sqrt(nvars)), ceil(sqrt(nvars)),k);
    for nn=1:npercentiles
        plot(irf(:,k,nn))
        hold on
    end
    hold off
    disp([endo_names{k} ' shock from ' shock_name]);
    title([endo_names{k} ' shock from ' shock_name]);
end
dyn_save_graph(dirname,[figure_name ' ' shock_name],options_.graph_save_formats, ...
               options_.TeX,names,tex_names,[figure_name ' ' shock_name]);
end