classdef RespiratoryPhase < Phase
    properties
        FullPhase = Phase;
        SelectedPhase = [];
        InspirationPositions = [];
        ExpirationPositions = [];
    end
    
    methods %constructor
       function obj=RespiratoryPhase(Phase)
            if nargin==0;return;end
            % gets properties of superclass
            obj.FullPhase = Phase.Values;
            obj.WorkLoad = Phase.WorkLoad;
            obj.Video = Phase.Video;
       end
   
    % Choose the correct IMF depending on the work load
    function SelectPhase(obj)
            if strcmp(obj.WorkLoad,'Rest')
                imf_number = 5;
            else if strcmp(obj.WorkLoad,'Exercise')
                    imf_number = 4;
                else if strcmp(obj.WorkLoad,'Continuous Acquisition')
                        imf_number = 5;
                    end
                end
            end
            obj.SelectedPhase = obj.FullPhase(imf_number,:); %Phase corresponding to respiratory phase
    end
        
        % Detects the frame's positions of inspiration moments
        function Inspiration(obj)
            max_resp_phase = max(obj.SelectedPhase); % respiratory phase maxima
            treshold_insp = 0.8*max_resp_phase; % inspiration treshold 
            index1 = obj.SelectedPhase > treshold_insp; % frames above inpiration treshold
            indexNumeric1 = find(index1);
            values1 = obj.SelectedPhase(indexNumeric1);
            [ordered_values1 oredered_index1] = sort(values1);
            obj.InspirationPositions = indexNumeric1(oredered_index1); % sorts the frames in ascending respiratory phase
        end
        
        % Detects the frame's positions of expiration moments
        function Expiration(obj)
            min_resp_phase = min(obj.SelectedPhase); % respiratory phase minima
            treshold_exp = 0.8*min_resp_phase; % systole treshold
            index2 = obj.SelectedPhase < treshold_exp; % frames below the systole treshold
            indexNumeric2 = find(index2);
            values2 = obj.SelectedPhase(indexNumeric2);
            [ordered_values2 oredered_index2] = sort(values2);
            obj.ExpirationPositions = indexNumeric2(oredered_index2); % sorts the frames in ascending respiratory phase
        end
            
      end
end