src/main/kotlin/dev/fyloz/colorrecipesexplorer/config/initializers/AbstractInitializer.kt

@@ -8,5 +8,5 @@ abstract class AbstractInitializer : ApplicationListener<ApplicationReadyEvent>
         initialize()
     }
 
-    abstract fun initialize()
+    protected abstract fun initialize()
 }

src/main/kotlin/dev/fyloz/colorrecipesexplorer/config/initializers/MixInitializer.kt

@@ -4,6 +4,7 @@ import dev.fyloz.colorrecipesexplorer.config.annotations.RequireDatabase
 import dev.fyloz.colorrecipesexplorer.model.Mix
 import dev.fyloz.colorrecipesexplorer.model.MixMaterial
 import dev.fyloz.colorrecipesexplorer.service.MixService
+import dev.fyloz.colorrecipesexplorer.utils.merge
 import mu.KotlinLogging
 import org.springframework.context.annotation.Configuration
 import java.util.*
@@ -24,9 +25,7 @@ class MixInitializer(
         logger.debug("Validating mix materials positions...")
 
         mixService.getAll()
-            .filter { mix ->
-                mix.mixMaterials.any { it.position == 0 }
-            }
+            .filter { mix -> mix.mixMaterials.any { it.position == 0 } }
             .forEach(this::fixMixPositions)
 
         logger.debug("Mix materials positions are valid!")
@@ -34,20 +33,19 @@ class MixInitializer(
 
     private fun fixMixPositions(mix: Mix) {
         val maxPosition = mix.mixMaterials.maxOf { it.position }
-        val nextPosition = maxPosition + 1
 
         logger.warn("Mix ${mix.id} (${mix.mixType.name}, ${mix.recipe.name}) has invalid positions:")
 
         val invalidMixMaterials: Collection<MixMaterial> = with(mix.mixMaterials.filter { it.position == 0 }) {
-            if (nextPosition == 1 && this.size > 1) {
+            if (maxPosition == 0 && this.size > 1) {
                 orderMixMaterials(this)
             } else {
                 this
             }
         }
 
-        val fixedMixMaterials = increaseMixMaterialsPosition(invalidMixMaterials, nextPosition)
-        val updatedMixMaterials = mergeMixMaterials(mix.mixMaterials, fixedMixMaterials)
+        val fixedMixMaterials = increaseMixMaterialsPosition(invalidMixMaterials, maxPosition + 1)
+        val updatedMixMaterials = mix.mixMaterials.merge(fixedMixMaterials)
 
         with(mix.copy(mixMaterials = updatedMixMaterials.toMutableSet())) {
             mixService.update(this)
@@ -61,11 +59,6 @@ class MixInitializer(
                 logger.info("\tPosition of material ${it.material.id} (${it.material.name}) has been set to ${it.position}")
             }
 
-    private fun mergeMixMaterials(mixMaterials: Iterable<MixMaterial>, updatedMixMaterials: Iterable<MixMaterial>) =
-        mixMaterials
-            .filter { mixMaterial -> updatedMixMaterials.all { it.id != mixMaterial.id } }
-            .plus(updatedMixMaterials)
-
     private fun orderMixMaterials(mixMaterials: Collection<MixMaterial>) =
         LinkedList(mixMaterials).apply {
             while (this.peek().material.materialType?.usePercentages == true) {

src/main/kotlin/dev/fyloz/colorrecipesexplorer/config/initializers/RecipeInitializer.kt

@@ -0,0 +1,72 @@
+package dev.fyloz.colorrecipesexplorer.config.initializers
+
+import dev.fyloz.colorrecipesexplorer.config.annotations.RequireDatabase
+import dev.fyloz.colorrecipesexplorer.model.Recipe
+import dev.fyloz.colorrecipesexplorer.model.RecipeGroupInformation
+import dev.fyloz.colorrecipesexplorer.model.RecipeStep
+import dev.fyloz.colorrecipesexplorer.service.RecipeService
+import dev.fyloz.colorrecipesexplorer.utils.merge
+import mu.KotlinLogging
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+@RequireDatabase
+class RecipeInitializer(
+    private val recipeService: RecipeService
+) : AbstractInitializer() {
+    private val logger = KotlinLogging.logger {}
+
+    override fun initialize() {
+        logger.debug("Executing recipe initializer...")
+        fixAllPositions()
+    }
+
+    private fun fixAllPositions() {
+        logger.debug("Validating recipes steps positions...")
+
+        recipeService.getAll()
+            .forEach(this::fixRecipePositions)
+
+        logger.debug("Recipes steps positions are valid!")
+    }
+
+    private fun fixRecipePositions(recipe: Recipe) {
+        val fixedGroupInformation = recipe.groupsInformation
+            .filter { it.steps != null }
+            .filter { groupInfo -> groupInfo.steps!!.any { it.position == 0 } }
+            .map { fixGroupInformationPositions(recipe, it) }
+
+        val updatedGroupInformation = recipe.groupsInformation.merge(fixedGroupInformation)
+
+        with(recipe.copy(groupsInformation = updatedGroupInformation.toMutableSet())) {
+            recipeService.update(this)
+        }
+    }
+
+    private fun fixGroupInformationPositions(
+        recipe: Recipe,
+        groupInformation: RecipeGroupInformation
+    ): RecipeGroupInformation {
+        val steps = groupInformation.steps!!
+        val maxPosition = steps.maxOf { it.position }
+
+        logger.warn("Recipe ${recipe.id} (${recipe.name}) has invalid positions:")
+
+        val invalidRecipeSteps = steps.filter { it.position == 0 }
+        val fixedRecipeSteps = increaseRecipeStepsPosition(groupInformation, invalidRecipeSteps, maxPosition + 1)
+        val updatedRecipeSteps = steps.merge(fixedRecipeSteps)
+
+        return groupInformation.copy(steps = updatedRecipeSteps.toMutableSet())
+    }
+
+    private fun increaseRecipeStepsPosition(
+        groupInformation: RecipeGroupInformation,
+        recipeSteps: Iterable<RecipeStep>,
+        firstPosition: Int
+    ) =
+        recipeSteps
+            .mapIndexed { index, recipeStep -> recipeStep.copy(position = firstPosition + index) }
+            .onEach {
+                logger.info("\tPosition of step ${it.id} (group: ${groupInformation.group.name}) has been set to ${it.position}")
+            }
+}

src/main/kotlin/dev/fyloz/colorrecipesexplorer/model/Recipe.kt

@@ -5,7 +5,6 @@ import dev.fyloz.colorrecipesexplorer.exception.AlreadyExistsException
 import dev.fyloz.colorrecipesexplorer.exception.NotFoundException
 import dev.fyloz.colorrecipesexplorer.model.account.Group
 import dev.fyloz.colorrecipesexplorer.model.account.group
-import dev.fyloz.colorrecipesexplorer.rest.CRE_PROPERTIES
 import dev.fyloz.colorrecipesexplorer.rest.FILE_CONTROLLER_PATH
 import java.net.URLEncoder
 import java.nio.charset.StandardCharsets
@@ -158,7 +157,7 @@ data class RecipeOutputDto(
 data class RecipeGroupInformation(
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    val id: Long?,
+    override val id: Long?,
 
     @ManyToOne
     @JoinColumn(name = "group_id")
@@ -169,7 +168,7 @@ data class RecipeGroupInformation(
     @OneToMany(cascade = [CascadeType.ALL], fetch = FetchType.EAGER, orphanRemoval = true)
     @JoinColumn(name = "recipe_group_information_id")
     var steps: MutableSet<RecipeStep>?
-)
+) : Model
 
 data class RecipeStepsDto(
     val groupId: Long,

src/main/kotlin/dev/fyloz/colorrecipesexplorer/utils/Collections.kt

@@ -1,9 +1,11 @@
 package dev.fyloz.colorrecipesexplorer.utils
 
+import dev.fyloz.colorrecipesexplorer.model.Model
+
 /** Returns a list containing the result of the given [transform] applied to each item of the [Iterable]. If the given [transform] throws, the [Throwable] will be passed to the given [throwableConsumer]. */
 inline fun <T, R, reified E : Throwable> Iterable<T>.mapMayThrow(
-  throwableConsumer: (E) -> Unit = {},
-  transform: (T) -> R
+    throwableConsumer: (E) -> Unit = {},
+    transform: (T) -> R
 ): List<R> = this.mapNotNull {
     try {
         transform(it)
@@ -19,17 +21,17 @@ inline fun <T, R, reified E : Throwable> Iterable<T>.mapMayThrow(
 
 /** Find duplicated in the given [Iterable] from keys obtained from the given [keySelector]. */
 inline fun <T, K> Iterable<T>.findDuplicated(keySelector: (T) -> K) =
-  this.groupBy(keySelector)
-    .filter { it.value.count() > 1 }
-    .map { it.key }
+    this.groupBy(keySelector)
+        .filter { it.value.count() > 1 }
+        .map { it.key }
 
 /** Check if the given [Iterable] has gaps between each items, using keys obtained from the given [keySelector]. */
 inline fun <T> Iterable<T>.hasGaps(keySelector: (T) -> Int) =
-  this.map(keySelector)
-    .toIntArray()
-    .sorted()
-    .filterIndexed { index, it -> it != index + 1 }
-    .isNotEmpty()
+    this.map(keySelector)
+        .toIntArray()
+        .sorted()
+        .filterIndexed { index, it -> it != index + 1 }
+        .isNotEmpty()
 
 /** Clears and fills the given [MutableCollection] with the given [elements]. */
 fun <T> MutableCollection<T>.setAll(elements: Collection<T>) {
@@ -40,6 +42,12 @@ fun <T> MutableCollection<T>.setAll(elements: Collection<T>) {
 /** Removes and returns all elements of a [MutableCollection] matching the given [predicate]. */
 inline fun <T> MutableCollection<T>.excludeAll(predicate: (T) -> Boolean): Iterable<T> {
     val matching = this.filter(predicate)
-    this.removeAll(matching)
+    this.removeAll(matching.toSet())
     return matching
 }
+
+/** Merge to [Model] [Iterable]s and prevent id duplication. */
+fun <T : Model> Iterable<T>.merge(other: Iterable<T>) =
+    this
+        .filter { model -> other.all { it.id != model.id } }
+        .plus(other)