refactor: optimize mappers

Signed-off-by: Alan Brault <alan.brault@visus.io>

src/main/kotlin/io/visus/demos/kotlinapi/api/dto/HealthResponse.kt

@@ -1,13 +1,14 @@
 package io.visus.demos.kotlinapi.api.dto
 
 import io.swagger.v3.oas.annotations.media.Schema
+import java.time.Instant
 
 @Schema(description = "Health check response")
 data class HealthResponse(
     @Schema(description = "Current status of the API", example = "UP")
     val status: String,
     @Schema(description = "Timestamp of the health check", example = "2024-01-01T12:00:00Z")
-    val timestamp: String,
+    val timestamp: Instant,
     @Schema(description = "Status of individual components")
     val components: Map<String, ComponentHealthDto>? = null,
 )

src/main/kotlin/io/visus/demos/kotlinapi/api/mappers/ComponentHealthDtoMapper.kt

@@ -6,8 +6,7 @@ import tech.mappie.api.ObjectMappie
 
 object ComponentHealthDtoMapper : ObjectMappie<ComponentHealth, ComponentHealthDto>() {
     override fun map(from: ComponentHealth): ComponentHealthDto =
-        ComponentHealthDto(
-            status = from.status.name,
-            message = from.message,
-        )
+        mapping {
+            ComponentHealthDto::status fromProperty ComponentHealth::status transform { it.name }
+        }
 }

src/main/kotlin/io/visus/demos/kotlinapi/api/mappers/HealthResponseMapper.kt

@@ -5,13 +5,10 @@ import io.visus.demos.kotlinapi.domain.model.HealthStatus
 import tech.mappie.api.ObjectMappie
 
 object HealthResponseMapper : ObjectMappie<HealthStatus, HealthResponse>() {
-    override fun map(from: HealthStatus): HealthResponse =
-        HealthResponse(
-            status = from.status.name,
-            timestamp = from.timestamp.toString(),
-            components =
-                from.components.mapValues { (_, componentHealth) ->
-                    ComponentHealthDtoMapper.map(componentHealth)
-                },
-        )
+    override fun map(from: HealthStatus): HealthResponse = mapping {
+        HealthResponse::status fromProperty HealthStatus::status transform { it.name }
+        HealthResponse::components fromProperty HealthStatus::components transform {
+            it.mapValues { (_, value) -> ComponentHealthDtoMapper.map(value) }
+        }
+    }
 }