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

shared/src/commonMain/kotlin/moe/lava/banksia/model/Stop.kt

@@ -8,7 +8,7 @@ data class Stop(
     val id: String,
     val name: String,
     val pos: Point,
-    val parent: String,
+    val parent: String?,
     val hasWheelChairBoarding: Boolean,
     val level: String,
     val platformCode: String,

shared/src/commonMain/kotlin/moe/lava/banksia/room/Database.kt

@@ -3,7 +3,11 @@ package moe.lava.banksia.room
 import androidx.room.AutoMigration
 import androidx.room.RoomDatabase
 import androidx.room.TypeConverters
+import androidx.room.migration.Migration
+import androidx.room.util.foreignKeyCheck
+import androidx.sqlite.SQLiteConnection
 import androidx.sqlite.driver.bundled.BundledSQLiteDriver
+import androidx.sqlite.execSQL
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.IO
 import moe.lava.banksia.room.converter.RouteTypeConverter
@@ -26,7 +30,7 @@ import moe.lava.banksia.room.entity.VersionMetadataEntity
 import androidx.room.Database as DatabaseAnnotation
 
 @DatabaseAnnotation(
-    version = 10,
+    version = 11,
     entities = [
         RouteEntity::class,
         ServiceEntity::class,
@@ -59,7 +63,21 @@ abstract class Database : RoomDatabase() {
             base.fallbackToDestructiveMigration(true)
                 .setDriver(BundledSQLiteDriver())
                 .setQueryCoroutineContext(Dispatchers.IO)
+                .addMigrations(MIGRATION_10_11)
 //                .fallbackToDestructiveMigration(true)
                 .build()
     }
 }
+
+val MIGRATION_10_11 = object : Migration(10, 11) {
+    override fun migrate(connection: SQLiteConnection) {
+        connection.execSQL("CREATE TABLE IF NOT EXISTS `_new_Stop` (`id` TEXT NOT NULL, `name` TEXT NOT NULL, `lat` REAL NOT NULL, `lng` REAL NOT NULL, `parent` TEXT, `hasWheelChairBoarding` INTEGER NOT NULL, `level` TEXT NOT NULL, `platformCode` TEXT NOT NULL, PRIMARY KEY(`id`), FOREIGN KEY(`parent`) REFERENCES `Stop`(`id`) ON UPDATE NO ACTION ON DELETE SET NULL DEFERRABLE INITIALLY DEFERRED)")
+        connection.execSQL("INSERT INTO `_new_Stop` (`id`,`name`,`lat`,`lng`,`parent`,`hasWheelChairBoarding`,`level`,`platformCode`) SELECT `id`,`name`,`lat`,`lng`,`parent`,`hasWheelChairBoarding`,`level`,`platformCode` FROM `Stop`")
+        connection.execSQL("UPDATE `_new_Stop` SET `parent` = NULL WHERE `parent` == \"\"")
+        connection.execSQL("DROP TABLE `Stop`")
+        connection.execSQL("ALTER TABLE `_new_Stop` RENAME TO `Stop`")
+        connection.execSQL("CREATE INDEX IF NOT EXISTS `index_Stop_parent` ON `Stop` (`parent`)")
+        connection.execSQL("CREATE INDEX IF NOT EXISTS `index_Trip_serviceId` ON `Trip` (`serviceId`)")
+        foreignKeyCheck(connection, "Stop")
+    }
+}

shared/src/commonMain/kotlin/moe/lava/banksia/room/dao/RouteDao.kt

@@ -37,13 +37,22 @@ interface RouteDao {
     """)
     suspend fun stops(id: String): List<StopEntity>
 
+    // I vibecoded this, sorry
     @Query("""
-        SELECT Stop.* FROM Stop
-        INNER JOIN Stop Child ON Child.parent == Stop.id
-        INNER JOIN StopTime ON StopTime.stopId == Child.id
-        INNER JOIN Trip ON Trip.id == StopTime.tripId
-        WHERE Trip.routeId == :id
-        GROUP BY Stop.id
+        WITH Tree AS (
+            SELECT Stop.* FROM Stop
+            INNER JOIN StopTime ON StopTime.stopId == Stop.id
+            INNER JOIN Trip ON Trip.id == StopTime.tripId
+            WHERE Trip.routeId == :id
+            GROUP BY Stop.id
+
+            UNION ALL
+
+            SELECT s.*
+            FROM Stop s
+            INNER JOIN Tree t ON s.id = t.parent
+        )
+        SELECT DISTINCT * FROM Tree WHERE parent IS NULL;
     """)
     suspend fun stopsParent(id: String): List<StopEntity>
 }

shared/src/commonMain/kotlin/moe/lava/banksia/room/dao/StopDao.kt

@@ -12,6 +12,13 @@ interface StopDao {
     @Query("SELECT * FROM Stop")
     suspend fun getAll(): List<StopEntity>
 
+    @Query("""
+        SELECT * FROM Stop
+        WHERE platformCode <> ""
+        AND parent == ""
+    """)
+    suspend fun getAllParentless(): List<StopEntity>
+
     @Query("SELECT * FROM Stop WHERE id == :id")
     suspend fun get(id: String): StopEntity?
 
@@ -29,4 +36,7 @@ interface StopDao {
 
     @Query("DELETE FROM Stop")
     suspend fun deleteAll()
+
+    @Query("UPDATE Stop SET parent = :parent WHERE id IN (:ids)")
+    suspend fun updateParents(ids: List<String>, parent: String)
 }

shared/src/commonMain/kotlin/moe/lava/banksia/room/dao/StopTimeDao.kt

@@ -27,7 +27,7 @@ interface StopTimeDao {
         INNER JOIN Trip ON Trip.serviceId == Service.id
         LEFT JOIN ServiceException ON ServiceException.serviceId == Service.id AND ServiceException.date == :date
         WHERE StopTime.tripId == Trip.id
-            AND StopTime.stopId == :stopId
+            AND StopTime.stopId IN (SELECT Stop.id FROM Stop WHERE Stop.parent == :stopId OR Stop.id == :stopId)
             AND ServiceException.type IS NULL
     """)
     suspend fun getForStopDated(stopId: String, days: Int, date: Int): List<StopTimeEntity>

shared/src/commonMain/kotlin/moe/lava/banksia/room/entity/StopEntity.kt

@@ -2,17 +2,30 @@ package moe.lava.banksia.room.entity
 
 import androidx.room.ColumnInfo
 import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.ForeignKey.Companion.SET_NULL
 import androidx.room.PrimaryKey
 import moe.lava.banksia.model.Stop
 import moe.lava.banksia.util.Point
 
-@Entity("Stop")
+@Entity(
+    "Stop",
+    foreignKeys = [
+        ForeignKey(
+            StopEntity::class,
+            parentColumns = ["id"],
+            childColumns = ["parent"],
+            onDelete = SET_NULL,
+            deferred = true,
+        ),
+    ]
+)
 data class StopEntity(
     @PrimaryKey val id: String,
     val name: String,
     val lat: Double,
     val lng: Double,
-    @ColumnInfo(index = true) val parent: String,
+    @ColumnInfo(index = true) val parent: String?,
     val hasWheelChairBoarding: Boolean,
     val level: String,
     val platformCode: String,

shared/src/commonMain/kotlin/moe/lava/banksia/room/entity/TripEntity.kt

@@ -15,7 +15,7 @@ import moe.lava.banksia.model.Trip
         ForeignKey(ServiceEntity::class, parentColumns = ["id"], childColumns = ["serviceId"], onDelete = CASCADE),
         ForeignKey(ShapeEntity::class, parentColumns = ["id"], childColumns = ["shapeId"], onDelete = CASCADE),
     ],
-    indices = [Index("shapeId")],
+    indices = [Index("shapeId"), Index("serviceId")],
 )
 data class TripEntity(
     @PrimaryKey val id: String,