#pragma once
// track_topology — pure folder arithmetic over a project's track list: which tracks
// are the DIRECT children of a folder parent, derived from the I_FOLDERDEPTH deltas
// alone. NO REAPER types (the shell reads the deltas); unit-tested by
// tests/test_track_topology.cpp.

#include <vector>

namespace reasampler::capture {

// Indices of `parentIndex`'s DIRECT children, given every track's I_FOLDERDEPTH in
// track order. I_FOLDERDEPTH is a DELTA applied AFTER its own track (SDK header
// ~2215: 0 = normal, 1 = opens a folder, -n = closes n folders), so the depth walk
// below is the only way to recover the tree from the flat list.
//
// Empty when `parentIndex` is out of range or its track does not open a folder.
// Grandchildren are deliberately excluded: their audio reaches the parent only
// through the direct child that owns them, so a caller silencing each direct child's
// send-to-parent silences the whole subtree. An unterminated folder (no closing
// negative delta) treats every remaining track as inside it, matching REAPER.
std::vector<int> directChildIndices(const std::vector<int>& folderDepths,
                                    int parentIndex);

}  // namespace reasampler::capture