make_json_eeg.m

% Make json files that combine: 
% 1. eeg data table
% 2. trial info:
% -- for each trial start time in frames
% -- separately, just in case, duration of each trial (or event)
% 3. task type - HaLt, CLA, etc
% 4. channel names (wtf if there X3 and X5?!)
% 5. sampling rate
% 6. subject info: gender, age, letter code
% 7. just in case, the marker codes
% 8. inter or not - some kind of special interactive thing they used

% Get the list of all the files
data_folder = 'D:\BCI\HaLT\'; % what a name
file_list = dir(fullfile(data_folder, '*.mat'));
for i = 1:length(file_list)
    egg_mat_file = file_list(i).name;
    % Load the .mat file
    load([data_folder egg_mat_file]); 

    % Get the file with the processed eeg data
    name_start = egg_mat_file(1:end-21); % or, (1:19) 
    eeg_proc_file_name = [name_start '_min_proc.csv'];
    
    % 1. EEG Data table
    eeg_data = readtable([data_folder eeg_proc_file_name]); % Extract processed EEG data
    channel_names = o.chnames; % Channel names
    sampling_rate = o.sampFreq; % Sampling frequency
    trial_markers = o.marker;
    
    % Get the trial info 
    [event_types, event_starts, event_durations] = get_trial_info(trial_markers);
    
    % Task type from file name
    if egg_mat_file(1) == 'H'
        task_type = 'HaLt'; 
    elseif egg_mat_file(1) == 'C'
        task_type = 'CLA';
    elseif egg_mat_file(1) == 'F'
        task_type = 'FreeForm';
    else
        error('hmm weird wtf task type');
    end
    
    % Check if there are 22 channels
    
    
    % Subject code from file name
    if eeg_proc_file_name(1) == 'H'
        subject = eeg_proc_file_name(12); % Code letter of the participant
    else
        error('take care of other task type beyond HalT');
    end
    
    
    % Now, create a structure to hold everything for the JSON
    json_struct.recording_name = name_start;
    json_struct.subject = subject;
    json_struct.task_type = task_type;
    json_struct.eeg_data = eeg_data;
    json_struct.sampling_rate = sampling_rate;
    json_struct.channel_names = channel_names;
    json_struct.event_start = event_starts;
    json_struct.event_duration = event_durations;
    json_struct.event_type = event_types;
    
    
    
    
    
    % 6. Convert structure to JSON
    json_str = jsonencode(json_struct);
    
    % 7. Save JSON to a file
    json_file_name = [data_folder eeg_proc_file_name(1:end-4) '.json']; % Change file name if needed
    fid = fopen(json_file_name, 'w');
    if fid == -1
        error('Cannot create JSON file');
    end
    fwrite(fid, json_str, 'char');
    fclose(fid);
    
    disp(['JSON file saved as ' json_file_name]);
end