src/main/kotlin/Routing.kt

@@ -1,8 +1,11 @@
 package com.example
 
+
 import com.example.dto.ErrorDto
 import com.example.dto.UserDto
 import com.example.dto.UserDto.BookingDto
+import domain.usecase.AddBookingUseCase
+import domain.usecase.GetBookingsUseCase
 import io.ktor.http.HttpStatusCode
 import io.ktor.http.content.PartData
 import io.ktor.http.content.forEachPart
@@ -10,6 +13,7 @@ import io.ktor.server.application.*
 import io.ktor.server.request.receiveMultipart
 import io.ktor.server.response.*
 import io.ktor.server.routing.*
+import repository.InMemoryBookingRepository
 
 val booking = mutableListOf(
     BookingDto(
@@ -23,10 +27,20 @@ val booking = mutableListOf(
 )
 
 fun Application.configureRouting() {
+    val repository = InMemoryBookingRepository()
+    val getBookingsUseCase = GetBookingsUseCase(repository)
+    val addBookingUseCase = AddBookingUseCase(repository)
+
     routing {
         get("/user") {
-            call.respond(UserDto(booking = booking))
+            val bookings = getBookingsUseCase()
+            val userDto = UserDto(
+                name = "Administrator",
+                booking = bookings.map { UserDto.BookingDto(it.room, it.time) }
+            )
+            call.respond(userDto)
         }
+
         post("/book") {
             var room = ""
             var time = ""
@@ -34,31 +48,25 @@ fun Application.configureRouting() {
 
             multipartData.forEachPart { part ->
                 try {
-                    if (part !is PartData.FormItem) return@forEachPart
+                    if (part is PartData.FormItem) {
-                    when (part.name) {
+                        when (part.name) {
-                        "room" -> {
+                            "room" -> room = part.value
-                            room = part.value.trim()
+                            "time" -> time = part.value
                         }
-
-                        "time" -> {
-                            time = part.value.trim()
-                        }
-
-                        else -> Unit
                     }
                 } finally {
                     part.dispose()
                 }
             }
 
-            if (room.isEmpty() && time.isEmpty()) {
+            val result = addBookingUseCase(room, time)
+            if (result.isSuccess) {
+                call.respond(HttpStatusCode.OK)
+            } else {
                 call.respond(
                     HttpStatusCode.BadRequest,
-                    ErrorDto(error = "Field is empty")
+                    ErrorDto("Field is empty")
                 )
-            } else {
-                booking.add(BookingDto(room = room, time = time))
-                call.respond(HttpStatusCode.OK)
             }
         }
     }

src/main/kotlin/domain/model/Booking.kt

@@ -0,0 +1,6 @@
+package domain.model
+
+data class Booking(
+    val room: String,
+    val time: String
+)

src/main/kotlin/domain/usecase/BookingUseCase.kt

@@ -0,0 +1,27 @@
+package domain.usecase
+import domain.model.Booking
+
+interface BookingRepository {
+    fun getAllBookings(): List<Booking>
+    fun addBooking(booking: Booking)
+}
+
+class GetBookingsUseCase(
+    private val repository: BookingRepository
+) {
+    operator fun invoke(): List<Booking> {
+        return repository.getAllBookings()
+    }
+}
+
+class AddBookingUseCase(
+    private val repository: BookingRepository
+) {
+    operator fun invoke(room: String, time: String): Result<Unit> {
+        if (room.isBlank() || time.isBlank()) {
+            return Result.failure(IllegalArgumentException("Room and time must not be empty"))
+        }
+        repository.addBooking(Booking(room.trim(), time.trim()))
+        return Result.success(Unit)
+    }
+}

src/main/kotlin/repository/InMemoryBookingRepository.kt

@@ -0,0 +1,17 @@
+package repository
+
+import domain.model.Booking
+import domain.usecase.BookingRepository
+
+class InMemoryBookingRepository : BookingRepository {
+    private val bookings = mutableListOf<Booking>().apply {
+        add(Booking("502.6", "10:00 - 18:00"))
+        add(Booking("504.6", "12:00 - 16:00"))
+    }
+
+    override fun getAllBookings(): List<Booking> = bookings.toList()
+
+    override fun addBooking(booking: Booking) {
+        bookings.add(booking)
+    }
+}