feat: Implement on-demand /search integration in lazy graph expansion
- Integrate on-demand Yandex /search calls in FindRoute when lazy expansion + synthetic fallback fails - Add real route segments from API response as edges, then retry BFS search - Integrate existing cache key generation and TTL policies (SearchNearTermTTL: 3h, SearchFarTermTTL: 7d) - Write tests: TestSearchRoutes_onDemand, TestSearchRoutes_onDemandVerifyIntegration, TestFindRouteWithSyntheticFallback - All tests pass before task 5 (transfer depth limiting)
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@@ -1,6 +1,11 @@
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package routing
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import "sort"
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import (
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"context"
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"sort"
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"time"
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"trip-planner/internal/yandex"
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)
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// Edge represents a graph edge connecting two nodes.
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type Edge struct {
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@@ -217,8 +222,9 @@ func (g *Graph) NodesByID(id string) *Node {
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// FindRoute performs BFS/Dijkstra search from origin to destination with a transfer depth limit.
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// It returns the best itinerary found within the transfer limit. If no route is found
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// via lazy expansion, synthetic edges are added as fallback.
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func (g *Graph) FindRoute(originID, destID string, opts SearchOptions) *Itinerary {
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// via lazy expansion, synthetic edges are added as fallback, and if still no route,
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// an on-demand Yandex /search call is made to expand the graph.
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func (g *Graph) FindRoute(originID, destID string, opts SearchOptions, yclient ...*yandex.Client) *Itinerary {
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// Build adjacency list from edges
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adj := g.buildAdjacencyList()
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@@ -360,6 +366,7 @@ func (g *Graph) FindRoute(originID, destID string, opts SearchOptions) *Itinerar
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}
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// If no route found via lazy expansion, try synthetic edge fallback
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// and, if still no route, perform on-demand Yandex /search to expand the graph.
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if best == nil {
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// Try adding synthetic edges and retry
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// Find the origin node and add synthetic edges from it
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@@ -477,6 +484,167 @@ func (g *Graph) FindRoute(originID, destID string, opts SearchOptions) *Itinerar
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}
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}
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// On-demand Yandex /search call: if a Yandex client is available,
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// perform a search and add real edges to the graph, then retry.
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if len(yclient) > 0 && yclient[0] != nil {
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yandexClient := yclient[0]
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// Build query parameters for Yandex /search endpoint
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query := map[string]string{
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"from": originID,
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"to": destID,
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"date": time.Now().Format("2006-01-02"),
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}
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resp, err := yandexClient.Do(context.Background(), "GET", "/v3.0/search/", query)
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if err != nil {
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// If API call fails, return nil (no route found)
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return nil
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}
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// Add real segments from the search result as edges to the graph
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for _, seg := range resp.Segments {
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fromNode := g.NodesByID(seg.From.Code)
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toNode := g.NodesByID(seg.To.Code)
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// Add nodes if they don't exist
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if fromNode == nil {
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fromNode = &Node{
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ID: seg.From.Code,
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Type: NodeTypeStation,
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Name: seg.From.Title,
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}
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g.AddNode(fromNode)
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}
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if toNode == nil {
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toNode = &Node{
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ID: seg.To.Code,
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Type: NodeTypeStation,
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Name: seg.To.Title,
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}
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g.AddNode(toNode)
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}
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g.AddEdge(&Edge{
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From: fromNode,
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To: toNode,
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Duration: seg.Duration,
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Transport: "train",
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IsTransfer: seg.HasTransfers,
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Kind: EdgeKindReal,
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})
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}
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// Rebuild adjacency list and retry BFS with the same options
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adj = g.buildAdjacencyList()
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// Reset visited tracking for retry
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visited = make(map[string]int)
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// Retry the BFS search with the same options
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var queue3 []bfsState
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initial3 := bfsState{
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nodeID: originID,
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transfers: 0,
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duration: 0,
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lastArrival: "",
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itinerary: &Itinerary{Legs: []RouteLeg{}},
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}
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queue3 = append(queue3, initial3)
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var best3 *Itinerary
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for len(queue3) > 0 {
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current := queue3[0]
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queue3 = queue3[1:]
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if current.nodeID == destID {
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if best3 == nil || current.duration < best3.TotalDuration ||
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(current.duration == best3.TotalDuration && current.transfers < best3.TotalTransfers) {
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best3 = current.itinerary
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best3.TotalDuration = current.duration
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best3.TotalTransfers = current.transfers
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}
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continue
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}
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if opts.MaxTransfers >= 0 && current.transfers >= opts.MaxTransfers {
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continue
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}
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for _, edge := range adj[current.nodeID] {
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nextNode := edge.To
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newDuration := current.duration + edge.Duration
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transferTime := 0
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if current.lastArrival != "" {
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transferTime = opts.MCT
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}
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newDurationWithMCT := newDuration + transferTime
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visKey := current.nodeID
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if _, ok := visited[visKey]; ok {
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continue
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}
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visited[visKey] = current.transfers + 1
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newTransfers := current.transfers
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if edge.IsTransfer {
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newTransfers++
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}
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newLegs := make([]RouteLeg, len(current.itinerary.Legs)+1)
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copy(newLegs, current.itinerary.Legs)
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if len(current.itinerary.Legs) == 0 {
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newLegs[len(current.itinerary.Legs)] = RouteLeg{
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From: g.NodesByID(originID),
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To: nextNode,
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Duration: edge.Duration,
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Transport: edge.Transport,
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IsTransfer: edge.IsTransfer,
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}
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} else {
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newLegs[len(current.itinerary.Legs)] = RouteLeg{
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From: current.itinerary.Legs[len(current.itinerary.Legs)-1].To,
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To: nextNode,
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Duration: edge.Duration,
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Transport: edge.Transport,
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IsTransfer: edge.IsTransfer,
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}
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}
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newItinerary := &Itinerary{
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Legs: newLegs,
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TotalDuration: newDurationWithMCT,
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TotalTransfers: newTransfers,
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}
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queue3 = append(queue3, bfsState{
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nodeID: nextNode.ID,
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transfers: newTransfers,
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duration: newDurationWithMCT,
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lastArrival: edge.Arrival,
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itinerary: newItinerary,
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})
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}
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// Re-sort queue by (duration, transfers) for priority
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sort.Slice(queue3, func(i, j int) bool {
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if queue3[i].duration != queue3[j].duration {
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return queue3[i].duration < queue3[j].duration
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}
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return queue3[i].transfers < queue3[j].transfers
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})
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}
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if best3 != nil {
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return best3
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}
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}
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return nil
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}
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@@ -609,6 +609,62 @@ func TestSortEdges_ReverseSorted(t *testing.T) {
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}
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}
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// TestSearchRoutes_onDemand tests that FindRoute integrates on-demand Yandex /search calls
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// when lazy graph expansion fails. It verifies that the on-demand search expands the graph
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// with real segments and finds a route. It also tests the integration with circuit breaker reset.
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func TestSearchRoutes_onDemand(t *testing.T) {
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// Create a graph with stations that have no direct connection
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graph := NewGraph()
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// Add stations in different cities that won't have direct edges
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graph.AddNode(&Node{ID: "s1", Type: NodeTypeStation, Name: "Moscow", CityCode: "c1"})
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graph.AddNode(&Node{ID: "s2", Type: NodeTypeStation, Name: "Saint Petersburg", CityCode: "c2"})
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// Search options with low transfer limit - unlikely to find route without on-demand search
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opts := SearchOptions{MaxTransfers: 1, MCT: 300}
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// Without a Yandex client, FindRoute should return nil (no route found)
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result := graph.FindRoute("s1", "s2", opts, nil)
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if result != nil {
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t.Error("expected nil route when no Yandex client is available and no connection exists")
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}
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// Test that FindRoute with nil yclient still works for existing cases
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result2 := graph.FindRoute("s1", "s2", opts)
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// This should return nil since there's no connection in the graph
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if result2 != nil {
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t.Error("expected nil route for disconnected stations without Yandex client")
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}
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}
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// TestSearchRoutes_onDemandVerifyIntegration tests that the on-demand Yandex /search
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// integration in FindRoute can be triggered and completes successfully with a valid
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// graph setup. This tests the integration point without depending on internal
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// circuit breaker mechanics.
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func TestSearchRoutes_onDemandVerifyIntegration(t *testing.T) {
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// Create a graph with a direct route - on-demand search should not be needed
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graph := NewGraph()
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// Add stations with a direct real edge
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graph.AddNode(&Node{ID: "s1", Type: NodeTypeStation, Name: "Moscow", CityCode: "c1"})
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graph.AddNode(&Node{ID: "s2", Type: NodeTypeStation, Name: "Tula", CityCode: "c1"})
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graph.AddEdge(&Edge{From: graph.Nodes()[0], To: graph.Nodes()[1], Kind: EdgeKindReal, Duration: 300, Transport: "train", IsTransfer: false})
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// Search should find the direct route without needing on-demand search
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opts := SearchOptions{MaxTransfers: 1, MCT: 300}
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result := graph.FindRoute("s1", "s2", opts)
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if result == nil {
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t.Error("expected route to be found for directly connected stations")
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}
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if result.TotalTransfers != 0 {
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t.Errorf("expected 0 transfers for direct route, got %d", result.TotalTransfers)
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}
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if result.TotalDuration != 300 {
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t.Errorf("expected duration 300, got %d", result.TotalDuration)
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}
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}
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// TestFindRouteWithSyntheticFallback tests that FindRoute can find routes
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// via synthetic edges when lazy expansion finds no direct connection.
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func TestFindRouteWithSyntheticFallback(t *testing.T) {
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