function res=calCTG(SysData,options,caseName,varargin)

%
% FUNCTION calCTG
%
% Function for calculating contingencies
% Author: Rui Yao <ruiyao@ieee.org>
%
% Copyright (C) 2021, UChicago Argonne, LLC. All rights reserved.
%
% OPEN SOURCE LICENSE
% 
% Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
% 
% 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
% 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
% 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
% 
% 
% ******************************************************************************************************
% DISCLAIMER
% 
% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
% WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
% PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY 
% DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
% PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
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% ***************************************************************************************************
%

res=[];

simSettings=getDefaultSimSettings();

if nargin<2
    options=regulateOptions();
else
    options=regulateOptions(options);
end

if nargin<3||isempty(caseName)
    caseName=['d_~',num2str(size(SysData.bus,1))];
end

nVarargs=length(varargin);
if nVarargs<1
    ME=MException('PowerSAS:invalidArgument','CTG should have arguments specifying contingencies.');
    throw(ME);
else
    lineSpec=[];
    
    if nVarargs>=1
        lineSpec=varargin{1};
    end
    if nVarargs>=2
        snapshot=varargin{2};
        hotStart=1;
    else
        snapshot=[];
        hotStart=0;
    end
    options.hotStart=hotStart;
    
    evtLineSpec=zeros(length(lineSpec),5);
    evtLineSpec(:,1)=lineSpec;
    evtLineSpec(:,2)=1;
    simSettings.evtLineSpec=evtLineSpec;
    simSettings.evtLine=[1,1,length(lineSpec)];
    simSettings.eventList=[simSettings.eventList;[2,0,0,7,1,simSettings.eventList(1,[6,7])]];
    
    res=runDynamicSimulationExec(caseName,SysData,simSettings,options,snapshot);
end

end

function options=regulateOptions(options)
if nargin<1
    options=[];
end
if ~isfield(options,'nlvl');options.nlvl=15;end
if ~isfield(options,'taylorN');options.taylorN=4;end
if ~isfield(options,'segAlpha');options.segAlpha=1;end
if ~isfield(options,'dAlpha');options.dAlpha=1;end
if ~isfield(options,'alphaTol');options.alphaTol=0.001;end
if ~isfield(options,'diffTol');options.diffTol=1e-6;end
if ~isfield(options,'diffTolMax');options.diffTolMax=1e-2;end
if ~isfield(options,'method');options.method=0;end
if ~isfield(options,'diffTolCtrl');options.diffTolCtrl=1e-5;end
if ~isfield(options,'Efstd');options.Efstd=1.2;end
end