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[Domain] Fix single-exit recommendations #274

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[Domain] Fix single-exit recommendations #274

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9e0f7c9
[Domain] Fix single-exit recommendations
muzygosu Jun 3, 2026
130e412
[Domain] Fix recommendation CI fixture
muzygosu Jun 3, 2026
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24 changes: 21 additions & 3 deletions src/domain/AlternativeRecommendationService.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -996,6 +996,21 @@ std::optional<ExitUsageMetric> leastUsedReachableExit(
return best;
}

std::size_t reachableExitCandidateCount(const AlternativeRecommendationInput& request) {
std::unordered_set<std::string> reachableExitZoneIds;
for (const auto& usage : exitUsageCandidates(request)) {
if (!usage.exitZoneId.empty()
&& exitReachableFromScenarioSources(request, usage.exitZoneId)) {
reachableExitZoneIds.insert(usage.exitZoneId);
}
}
return reachableExitZoneIds.size();
}

bool hasAlternativeReachableExit(const AlternativeRecommendationInput& request) {
return reachableExitCandidateCount(request) >= 2;
}

bool bottleneckLessSevere(const ScenarioBottleneckMetric& lhs, const ScenarioBottleneckMetric& rhs) {
if (lhs.stalledAgentCount == rhs.stalledAgentCount) {
return lhs.nearbyAgentCount < rhs.nearbyAgentCount;
Expand Down Expand Up @@ -1410,6 +1425,9 @@ std::optional<AlternativeRecommendationCandidate> makeBottleneckGuidanceCandidat
if (!bottleneck.has_value() || bottleneck->connectionId.empty()) {
return std::nullopt;
}
if (!hasAlternativeReachableExit(request)) {
return std::nullopt;
}
const auto adjacentExitZoneIds = adjacentExitZoneIdsForConnection(request, bottleneck->connectionId);
const auto targetExit = leastUsedReachableExit(
request,
Expand Down Expand Up @@ -1487,7 +1505,7 @@ std::optional<AlternativeRecommendationCandidate> makeBottleneckGuidanceCandidat
std::optional<AlternativeRecommendationCandidate> makeExitBalancingCandidate(
const AlternativeRecommendationInput& request,
const RecommendationContext& context) {
if (exitUsageCandidates(request).size() < 2) {
if (!hasAlternativeReachableExit(request)) {
return std::nullopt;
}
const auto low = context.leastUsedReachableExit;
Expand Down Expand Up @@ -1561,7 +1579,7 @@ std::optional<AlternativeRecommendationCandidate> makePressureHotspotCandidate(
if (!hasPressureSignal(request)) {
return std::nullopt;
}
if (exitUsageCandidates(request).size() < 2) {
if (!hasAlternativeReachableExit(request)) {
return std::nullopt;
}

Expand Down Expand Up @@ -1670,7 +1688,7 @@ std::optional<AlternativeRecommendationCandidate> makeCrossFlowCandidate(
}

const auto severity = signal->severity;
if (!context.exitUsageImbalanced && exitUsageCandidates(request).size() >= 2) {
if (!context.exitUsageImbalanced && hasAlternativeReachableExit(request)) {
const auto targetExit = context.leastUsedReachableExit;
if (targetExit.has_value()
&& context.mostUsedExit.has_value()
Expand Down
36 changes: 35 additions & 1 deletion tests/AlternativeRecommendationServiceTests.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -512,6 +512,26 @@ SC_TEST(AlternativeRecommendationService_addsBottleneckGuidanceAtExit) {
SC_EXPECT_TRUE(containsDiffKey(it->recommendedScenario, "control.routeGuidances"));
}

SC_TEST(AlternativeRecommendationService_skipsBottleneckGuidanceForSingleExitLayout) {
ScenarioRiskSnapshot risk;
risk.bottlenecks.push_back({
.connectionId = "door-main",
.nearbyAgentCount = 8,
.stalledAgentCount = 5,
});

const AlternativeRecommendationService service;
const auto result = service.recommend({
.layout = makeSingleExitRecommendationLayout(),
.sourceScenario = makeScenario(),
.risk = risk,
.artifacts = makeSingleExitUsageArtifacts("exit-main", "Main Exit", 20, 1.0),
});

SC_EXPECT_TRUE(!hasCandidateKind(result, AlternativeRecommendationKind::BottleneckBypassGuidance));
SC_EXPECT_TRUE(!hasCandidateKind(result, AlternativeRecommendationKind::ExitUsageBalancing));
}

SC_TEST(AlternativeRecommendationService_installsCorridorBottleneckGuidanceAtExitOnly) {
ScenarioRiskSnapshot risk;
risk.bottlenecks.push_back({
Expand Down Expand Up @@ -1007,11 +1027,25 @@ SC_TEST(AlternativeRecommendationService_sortsBlockedReliefBeforeGuidance) {
.nearbyAgentCount = 8,
.stalledAgentCount = 5,
});
auto layout = makeRecommendationLayout();
layout.zones.push_back({
.id = "exit-west",
.floorId = "L1",
.kind = ZoneKind::Exit,
.label = "West Exit",
});
layout.connections.push_back({
.id = "door-west",
.floorId = "L1",
.kind = ConnectionKind::Exit,
.fromZoneId = "room-a",
.toZoneId = "exit-west",
});
const auto artifacts = makeExitUsageArtifacts();

const AlternativeRecommendationService service;
const auto result = service.recommend({
.layout = makeRecommendationLayout(),
.layout = layout,
.sourceScenario = scenario,
.risk = risk,
.artifacts = artifacts,
Expand Down
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