chore: add serializer for api

src/main/kotlin/application/presenter/api/serializer/ApiSerializer.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2023. Smart Operating Block
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package application.presenter.api.serializer
+
+import application.presenter.api.model.EnvironmentalDataApiDto
+import application.presenter.api.model.RoomApiDto
+import application.presenter.api.model.RoomApiDtoType
+import application.presenter.api.model.ValueWithUnit
+import entity.zone.Room
+import entity.zone.RoomEnvironmentalData
+import entity.zone.RoomType
+
+/**
+ * Serializer for data to return in API.
+ */
+object ApiSerializer {
+    /**
+     * Extension method to convert [Room] API DTO to [application.presenter.api.model.RoomApiDto] class.
+     */
+    fun Room.toRoomApiDto(): RoomApiDto = RoomApiDto(
+        id = this.id.value,
+        name = this.name.orEmpty(),
+        zoneId = this.zoneId.value,
+        type = this.type.toRoomApiDtoType(),
+        environmentalData = this.environmentalData.toEnvironmentDataApiDto()
+    )
+
+    private fun RoomEnvironmentalData.toEnvironmentDataApiDto() = EnvironmentalDataApiDto(
+        temperature = this.temperature?.let { ValueWithUnit(it.value, it.unit.toString()) },
+        humidity = this.humidity?.percentage,
+        luminosity = this.luminosity?.let { ValueWithUnit(it.value, it.unit.toString()) },
+        presence = this.presence?.presenceDetected
+    )
+
+    private fun RoomType.toRoomApiDtoType() = when (this) {
+        RoomType.OPERATING_ROOM -> RoomApiDtoType.OPERATING_ROOM
+        RoomType.PRE_OPERATING_ROOM -> RoomApiDtoType.PRE_OPERATING_ROOM
+    }
+}