function make_variations()
%MAKE_VARIATIONS Generate one self-contained subfolder per grouping x window.
%   MAKE_VARIATIONS() writes analysis/matlab/variations/<grouping>_<window>/
%   for every combination below, each holding exactly three files:
%     data.csv    the curated data subset for that variation
%     analyze.m   a simple, standalone MATLAB script (copy of
%                 variation_analyze.m) that fits the paper's LME on data.csv
%     result.txt  the text result that analyze.m produces
%   and a top-level variations/SUMMARY.csv indexing all variations.
%
%   Groupings (stim = 1 treatment / stim = 0 control; all OTHER groups dropped):
%     unmerge     Box-B2                vs Box-A2
%     right_only  Box-B2 + Right-Elec.  vs Box-A2                 (Box-A dropped)
%     naive_a2    Box-B2                vs Box-A2 + Naive         (Right, Box-A dropped)
%     naive_boxa  Box-B2                vs Box-A2 + Naive + Box-A (Right dropped)
%   Windows: 0-10, 0-13, 0-5, 6-10, 6-13.
%
%   The model in each analyze.m is the paper's:
%     behavior ~ stim + day + stim:day + (1|rat)   (behavior = success COUNT).

thisDir = fileparts(mfilename('fullpath'));
templateScript = fullfile(thisDir, 'variation_analyze.m');
root = fullfile(thisDir, 'variations');
if ~exist(root, 'dir'); mkdir(root); end

B2 = 'Electrode-Box-B2'; A2 = 'Electrode-Box-A2'; NAIVE = 'Naive';
BOXA = 'Electrode-Box-A'; RIGHT = 'Right-Electrode';

% grouping name | treatment groups (stim=1) | control groups (stim=0)
groupings = {
    'unmerge',    {B2},         {A2}
    'right_only', {B2, RIGHT},  {A2}
    'naive_a2',   {B2},         {A2, NAIVE}
    'naive_boxa', {B2},         {A2, NAIVE, BOXA}
    };

% window name | [loDay hiDay]
windows = {
    'd0_10', [0 10]
    'd0_13', [0 13]
    'd0_5',  [0 5]
    'd6_10', [6 10]
    'd6_13', [6 13]
    };

T = tdcs_load_data();
allGroup = cellstr(T.group);

rows = {};   % accumulate SUMMARY rows
for gi = 1:size(groupings, 1)
    gname = groupings{gi, 1};
    treat = groupings{gi, 2};
    ctrl = groupings{gi, 3};
    inTreat = ismember(allGroup, treat);
    inCtrl = ismember(allGroup, ctrl);

    for wi = 1:size(windows, 1)
        wname = windows{wi, 1};
        w = windows{wi, 2};
        sel = (inTreat | inCtrl) & T.day >= w(1) & T.day <= w(2);

        D = T(sel, :);
        stim = double(inTreat(sel));
        Dout = table(string(D.subject), string(D.group), D.day, D.success, ...
            D.total, stim, 'VariableNames', ...
            {'subject', 'group', 'day', 'success', 'total', 'stim'});

        vname = [gname '_' wname];
        folder = fullfile(root, vname);
        if ~exist(folder, 'dir'); mkdir(folder); end
        writetable(Dout, fullfile(folder, 'data.csv'));
        copyfile(templateScript, fullfile(folder, 'analyze.m'));

        try
            r = localRun(fullfile(folder, 'analyze.m'));
            rows(end + 1, :) = {vname, gname, wname, r.nRats, r.nObs, ...
                r.covEqual, r.interP, r.interEst, r.stimP, r.dayP}; %#ok<AGROW>
            fprintf('  %-16s N=%2d obs=%4d  interaction p=%.4g (%+.2f)  %s\n', ...
                vname, r.nRats, r.nObs, r.interP, r.interEst, ...
                localTern(r.covEqual, 'equal-cov', 'UNEQUAL-cov'));
        catch ME
            localWriteError(folder, ME);
            fprintf(2, '  %-16s ERROR: %s\n', vname, ME.message);
        end
    end
end

% Top-level index of all variations.
S = cell2table(rows, 'VariableNames', {'variation', 'grouping', 'window', ...
    'nRats', 'nObs', 'covEqual', 'interaction_p', 'interaction_est', ...
    'stim_p', 'day_p'});
writetable(S, fullfile(root, 'SUMMARY.csv'));
fprintf('\nWrote %d variations under %s\n(index: variations/SUMMARY.csv)\n', ...
    size(rows, 1), root);

end

function r = localRun(scriptPath)
%LOCALRUN Execute one analyze.m in an isolated workspace and return its
%   VARRESULT struct. Isolation prevents the script's variables (D, m, ...)
%   from colliding with the generator's loop state.
run(scriptPath);
r = VARRESULT; %#ok<NODEF>  (defined by the analyze.m script just run)
end

function localWriteError(folder, ME)
fid = fopen(fullfile(folder, 'result.txt'), 'w');
fprintf(fid, 'ERROR fitting this variation:\n%s\n', getReport(ME, 'basic'));
fclose(fid);
end

function out = localTern(cond, a, b)
if cond; out = a; else; out = b; end
end