reasampler/tests/test_view_reconcile.cpp

// Standalone tests for the Design View repair pass's pure decision — no REAPER, no
// test framework.
//
// The two properties the pass exists for: it drives a flag ONLY where a park record
// names the track (so a track the tool never parked can never have its main send
// re-enabled under it), and it fires on applied-output drift rather than on "an undo
// happened". Both AppliedStates are produced by the real fingerprint
// (view::appliedState) over real models, so a change to what the fingerprint carries
// shows up here rather than being papered over by hand-built fixtures.

#include "../src/shell/view/view_reconcile.h"

#include <cstdio>
#include <string>
#include <vector>

using namespace reasampler;

static int g_fail = 0;
#define CHECK(cond) do { if(!(cond)) { \
    std::printf("FAIL line %d: %s\n", __LINE__, #cond); ++g_fail; } } while(0)

namespace {

TrackSnapshot captured(int showInTcp, int showInMixer, int mainSend, int fxEnable) {
    TrackSnapshot snap;
    snap.showInTcp   = showInTcp;
    snap.showInMixer = showInMixer;
    snap.mainSend    = mainSend;
    snap.fxEnable    = fxEnable;
    return snap;
}

bool hasOp(const std::vector<TrackFlagOp>& ops, const std::string& guid, Flag flag, int value) {
    for (const TrackFlagOp& op : ops)
        if (op.guid == guid && op.flag == flag && op.value == value) return true;
    return false;
}

bool namesTrack(const std::vector<TrackFlagOp>& ops, const std::string& guid) {
    for (const TrackFlagOp& op : ops)
        if (op.guid == guid) return true;
    return false;
}

}  // namespace

// -- the trigger: applied-output drift, not "an undo happened" -----------------

static void testAnUndoThatLeftOurAppliedOutputAloneRepairsNothing() {
    // The rejected trigger is "did an undo occur" — an undo that touched nothing we
    // drive still answers yes, and repairing on it rewrites state the user owns.
    ViewModeModel model;
    model.setActiveMode(kDesignModeId);
    model.storeSnapshot("{A}", captured(1, 1, 1, 1));

    const view::AppliedState state = view::appliedState(model);
    CHECK(planReconcile(state, state).empty());
}

static void testADriftedActiveModeAloneIsNotAReasonToDriveATrack() {
    // Drift is the gate, not the instruction: the record still has an owner, so the
    // reapply that follows this pass is what drives it.
    ViewModeModel applied;
    applied.setActiveMode(kDesignModeId);
    applied.storeSnapshot("{A}", captured(1, 1, 1, 1));

    ViewModeModel reloaded;  // active mode Arrange — the fingerprint differs
    reloaded.storeSnapshot("{A}", captured(1, 1, 1, 1));

    CHECK(view::appliedState(applied) != view::appliedState(reloaded));
    CHECK(planReconcile(view::appliedState(applied), view::appliedState(reloaded)).empty());
}

// -- the scope rule: a record names the track, or nothing is written -----------

static void testARecordTheReloadedModelLostIsHandedBackItsCapturedValues() {
    // The undo case: REAPER rolled view_state back to before the switch, so the model
    // no longer records the park — but the flags are still driven on the track, and
    // this memo is the only surviving account of what they were.
    ViewModeModel applied;
    applied.setActiveMode(kDesignModeId);
    applied.storeSnapshot("{A}", captured(1, 1, 1, 1));

    const ViewModeModel reloaded;  // Arrange, no records at all

    const std::vector<TrackFlagOp> ops =
        planReconcile(view::appliedState(applied), view::appliedState(reloaded));

    CHECK(ops.size() == 4);
    CHECK(hasOp(ops, "{A}", Flag::ShowInTcp, 1));
    CHECK(hasOp(ops, "{A}", Flag::ShowInMixer, 1));
    CHECK(hasOp(ops, "{A}", Flag::MainSend, 1));
    CHECK(hasOp(ops, "{A}", Flag::FxEnable, 1));
}

static void testARepairedFlagReturnsToItsCapturedValueNeverToOn() {
    // A track the user had OUT of the master mix and FX-bypassed before we parked it:
    // the repair must hand back exactly that, not a hardcoded "on".
    ViewModeModel applied;
    applied.setActiveMode(kDesignModeId);
    applied.storeSnapshot("{A}", captured(1, 0, 0, 0));

    const ViewModeModel reloaded;

    const std::vector<TrackFlagOp> ops =
        planReconcile(view::appliedState(applied), view::appliedState(reloaded));

    CHECK(hasOp(ops, "{A}", Flag::MainSend, 0));
    CHECK(hasOp(ops, "{A}", Flag::ShowInMixer, 0));
    CHECK(hasOp(ops, "{A}", Flag::FxEnable, 0));
    CHECK(!hasOp(ops, "{A}", Flag::MainSend, 1));
}

static void testATrackNeitherStateRecordsIsNeverDrivenAtAll() {
    // The regression this rule is built against: a track the model merely calls
    // active is NOT a track the tool parked. It holds no captured value, so asserting
    // B_MAINSEND=1 on it would silently re-enable a send the user disabled by hand.
    ViewModeModel applied;
    applied.setActiveMode(kDesignModeId);
    applied.storeSnapshot("{A}", captured(1, 1, 1, 1));

    ViewModeModel reloaded;
    reloaded.membership().tag("{B}", kArrangeModeId);  // active, never parked, no record

    const std::vector<TrackFlagOp> ops =
        planReconcile(view::appliedState(applied), view::appliedState(reloaded));

    CHECK(namesTrack(ops, "{A}"));
    CHECK(!namesTrack(ops, "{B}"));
}

static void testASpentFlagHalfIsNotARecordToRepairFrom() {
    // A restore already handed the flags back and zeroed them on the record; the FX
    // half outlives that. Repairing from the spent half would drive those zeros —
    // i.e. re-park the track — so the fingerprint must not carry it.
    ViewModeModel applied;
    applied.setActiveMode(kDesignModeId);
    applied.storeSnapshot("{A}", captured(1, 1, 1, 1));
    applied.releaseSnapshotFlags("{A}");

    const ViewModeModel reloaded;

    CHECK(planReconcile(view::appliedState(applied), view::appliedState(reloaded)).empty());
}

int main() {
    testAnUndoThatLeftOurAppliedOutputAloneRepairsNothing();
    testADriftedActiveModeAloneIsNotAReasonToDriveATrack();

    testARecordTheReloadedModelLostIsHandedBackItsCapturedValues();
    testARepairedFlagReturnsToItsCapturedValueNeverToOn();
    testATrackNeitherStateRecordsIsNeverDrivenAtAll();
    testASpentFlagHalfIsNotARecordToRepairFrom();

    if (g_fail == 0) std::printf("All tests passed.\n");
    return g_fail ? 1 : 0;
}