feat(server): better support for parent stops

- add datafixer to add parent stops for likely candidates
  - this is mainly for bus hubs, the heuristic is the existence of a
    platform code and missing parent
- use parent stops as default in route_stops
- support parent stops for stoptime querying

server/src/main/kotlin/moe/lava/banksia/server/Application.kt

@@ -54,6 +54,13 @@ fun Application.module() {
     }
 
     routing {
+        if (Constants.devMode) {
+            get("/fixup") {
+                call.respondText("received")
+                val fixer by inject<GtfsDataFixer>()
+                fixer.addParentsToStops()
+            }
+        }
         get("/update") {
             val key = call.parameters["key"]
             if (key != Constants.updateKey) {
@@ -66,8 +73,11 @@ fun Application.module() {
                 ?: "https://opendata.transport.vic.gov.au/dataset/3f4e292e-7f8a-4ffe-831f-1953be0fe448/resource/${datasetUuid}/download/gtfs.zip"
             call.respondText("received")
             launch(context = Dispatchers.IO) {
+                val fixer by inject<GtfsDataFixer>()
                 val importer by inject<GtfsImporter>()
                 importer.import(datasetUrl)
+
+                fixer.addParentsToStops()
             }
         }
 
@@ -123,7 +133,7 @@ fun Application.module() {
         }
         get("/route_stops/{route_id}") {
             val routeId = call.parameters["route_id"]!!
-            val useParent = call.queryParameters["parent"] in listOf("true", "1")
+            val useParent = call.queryParameters["parent"] !in listOf("false", "0")
             val stops = withContext(Dispatchers.IO) {
                 val routeDao by inject<RouteDao>()
                 if (useParent)

server/src/main/kotlin/moe/lava/banksia/server/GtfsDataFixer.kt

@@ -0,0 +1,43 @@
+package moe.lava.banksia.server
+
+import moe.lava.banksia.room.Database
+import moe.lava.banksia.room.entity.StopEntity
+import moe.lava.banksia.util.log
+import java.security.MessageDigest
+
+class GtfsDataFixer(
+    private val database: Database,
+) {
+    suspend fun addParentsToStops() {
+        val dao = database.stopDao
+        val stops = dao.getAllParentless()
+        stops
+            .groupBy { it.name.split("/")[0] }
+            .filter { (_, stops) -> stops.size > 1 }
+            .forEach { (name, stops) ->
+                val avgLat = stops.map { it.lat }.average()
+                val avgLng = stops.map { it.lng }.average()
+                val hash = name.sha256().substring(0, 7)
+                val parentId = "bsia:df1:$hash"
+                val parent = StopEntity(
+                    id = parentId,
+                    name = name,
+                    lat = avgLat,
+                    lng = avgLng,
+                    parent = "",
+                    hasWheelChairBoarding = stops.all { it.hasWheelChairBoarding },
+                    level = "",
+                    platformCode = "",
+                )
+                log("datafixer", "inserting ${parentId} for ${stops.size} children")
+                dao.insertAll(parent)
+                database.stopDao.updateParents(stops.map { it.id }, parentId)
+            }
+    }
+}
+
+private fun String.sha256() =
+    MessageDigest
+        .getInstance("SHA-256")
+        .digest(this.toByteArray())
+        .joinToString("") { "%02x".format(it) }

server/src/main/kotlin/moe/lava/banksia/server/di/ServerModules.kt

@@ -1,6 +1,7 @@
 package moe.lava.banksia.server.di
 
 import io.ktor.client.HttpClient
+import moe.lava.banksia.server.GtfsDataFixer
 import moe.lava.banksia.server.GtfsImporter
 import moe.lava.banksia.server.gtfs.GtfsParser
 import moe.lava.banksia.server.gtfsrt.GtfsrtService
@@ -12,5 +13,6 @@ val ServerModules = module {
     singleOf(::GtfsParser)
     singleOf(::GtfsrtService)
 
+    singleOf(::GtfsDataFixer)
     singleOf(::GtfsImporter)
 }