[step5] 자동차 경주(리팩토링)

src/main/kotlin/racingcar/CarApplication.kt

@@ -4,7 +4,6 @@ import racingcar.controller.RacingController
 
 private val racingController: RacingController = RacingController()
 fun main() {
-    val joinRacingCar = racingController.join()
-    val playRacingCar = racingController.play(joinRacingCar)
-    racingController.winner(playRacingCar)
+    val playRacingCar = racingController.play()
+    racingController.win(playRacingCar)
 }

src/main/kotlin/racingcar/controller/RacingController.kt

@@ -2,23 +2,24 @@ package racingcar.controller
 
 import racingcar.domain.Cars
 import racingcar.domain.WinnerCar
-import racingcar.inputCarName
-import racingcar.inputTryCount
-import racingcar.view.printRacing
-import racingcar.view.printWinner
+import racingcar.service.RacingService
+import racingcar.view.OutputView.printWinners
+import racingcar.view.inputCarName
 
-class RacingController {
-    fun join(): Cars = Cars.of(inputCarName().split(","))
+class RacingController(
+    private val racingService: RacingService = RacingService()
+) {
+    fun play(): Cars {
+        return racingService.play(join())
+    }
+
+    private fun join(): Cars = Cars.of(inputCarName().split(RACING_CAR_DELIMITER))
 
-    fun play(racingCars: Cars): Cars {
-        repeat(inputTryCount()) {
-            racingCars.move()
-            printRacing(racingCars)
-        }
-        return racingCars
+    fun win(playRacingCar: Cars) {
+        printWinners(WinnerCar.from(playRacingCar))
     }
 
-    fun winner(playRacingCar: Cars) {
-        printWinner(WinnerCar.from(playRacingCar))
+    companion object {
+        private const val RACING_CAR_DELIMITER = ","
     }
 }

src/main/kotlin/racingcar/service/RacingService.kt

@@ -0,0 +1,15 @@
+package racingcar.service
+
+import racingcar.domain.Cars
+import racingcar.view.OutputView
+import racingcar.view.inputTryCount
+
+class RacingService {
+    fun play(racingCars: Cars): Cars {
+        repeat(inputTryCount()) {
+            racingCars.move()
+            OutputView.printRacing(racingCars)
+        }
+        return racingCars
+    }
+}

src/main/kotlin/racingcar/view/InputView.kt

@@ -1,4 +1,4 @@
-package racingcar
+package racingcar.view
 
 fun inputTryCount(): Int {
     println("시도할 횟수는 몇 회인가요?")

src/main/kotlin/racingcar/view/OutputView.kt

@@ -3,16 +3,24 @@ package racingcar.view
 import racingcar.domain.Car
 import racingcar.domain.Cars
 
-fun printRacing(racingCars: Cars) {
-    racingCars.cars.forEach {
-        println("${it.name} : ${"-".repeat(maxOf(0, it.position))}")
+object OutputView {
+
+    private const val WINNER_JOIN_SEPARATOR = ","
+    private const val RACING_COURSE = "-"
+    fun printRacing(racingCars: Cars) {
+        val result = buildString {
+            racingCars.cars.forEach {
+                appendLine("${it.name} : ${RACING_COURSE.repeat(maxOf(0, it.position))}")
+            }
+            appendLine()
+        }
+        println(result)
     }
-    println()
-}
 
-fun printWinner(winnerCars: List<Car>): String = buildString {
-    val winnersCarNames = winnerCars
-        .joinToString(",") { it.name }
+    fun printWinners(winnerCars: List<Car>): String = buildString {
+        val winnersCarNames = winnerCars
+            .joinToString(WINNER_JOIN_SEPARATOR) { it.name }
 
-    println("${winnersCarNames}가 최종 우승했습니다.")
+        println("${winnersCarNames}가 최종 우승했습니다.")
+    }
 }