From 91aa2e41b708a61d6bb8b5868470cd615387206f Mon Sep 17 00:00:00 2001
From: Matej Focko <mfocko@redhat.com>
Date: Sat, 4 Dec 2021 15:54:39 +0100
Subject: [PATCH] day(02): refactor

Signed-off-by: Matej Focko <mfocko@redhat.com>
---
 src/day02/Day02.kt | 89 ++++++++++++++++++++++------------------------
 1 file changed, 43 insertions(+), 46 deletions(-)

diff --git a/src/day02/Day02.kt b/src/day02/Day02.kt
index db2ef6b..4ae3317 100644
--- a/src/day02/Day02.kt
+++ b/src/day02/Day02.kt
@@ -6,53 +6,50 @@ enum class Command {
     FORWARD, DOWN, UP
 }
 
+data class Position(val horizontal: Int = 0, val depth: Int = 0, val aim: Int = 0)
+data class Instruction(val type: Command, val value: Int)
+
+fun parseInstruction(instruction: String): Instruction {
+    val splitLine = instruction.split(' ')
+    check(splitLine.size == 2)
+
+    val value = splitLine[1].toInt()
+    when (splitLine[0]) {
+        "forward" -> return Instruction(Command.FORWARD, value)
+        "down" -> return Instruction(Command.DOWN, value)
+        "up" -> return Instruction(Command.UP, value)
+    }
+    throw IllegalArgumentException("Cannot parse instruction")
+}
+
+fun toCommands(input: List<String>): List<Instruction> = input.map { parseInstruction(it) }
+
+fun part1(input: List<Instruction>): Int {
+    val finalPosition = input.fold(Position()) { pos, instruction ->
+        when (instruction.type) {
+            Command.FORWARD -> pos.copy(horizontal = pos.horizontal + instruction.value)
+            Command.UP -> pos.copy(depth = pos.depth - instruction.value)
+            Command.DOWN -> pos.copy(depth = pos.depth + instruction.value)
+        }
+    }
+    return finalPosition.horizontal * finalPosition.depth
+}
+
+fun part2(input: List<Instruction>): Int {
+    val finalPosition = input.fold(Position()) { pos, instruction ->
+        when (instruction.type) {
+            Command.FORWARD -> pos.copy(
+                horizontal = pos.horizontal + instruction.value,
+                depth = pos.depth + instruction.value * pos.aim
+            )
+            Command.UP -> pos.copy(aim = pos.aim - instruction.value)
+            Command.DOWN -> pos.copy(aim = pos.aim + instruction.value)
+        }
+    }
+    return finalPosition.horizontal * finalPosition.depth
+}
+
 fun main() {
-    data class Position(val horizontal: Int = 0, val depth: Int = 0, val aim: Int = 0)
-    data class Instruction(val type: Command, val value: Int)
-
-    fun parseInstruction(instruction: String): Instruction {
-        val splitLine = instruction.split(' ')
-        check(splitLine.size == 2)
-
-        val value = splitLine[1].toInt()
-        when (splitLine[0]) {
-            "forward" -> return Instruction(Command.FORWARD, value)
-            "down" -> return Instruction(Command.DOWN, value)
-            "up" -> return Instruction(Command.UP, value)
-        }
-        throw IllegalArgumentException("Cannot parse instruction")
-    }
-
-    fun toCommands(input: List<String>): List<Instruction> {
-        return input.map { parseInstruction(it) }
-    }
-
-    fun part1(input: List<Instruction>): Int {
-        val finalPosition = input.fold(Position()) { pos, instruction ->
-            when (instruction.type) {
-                Command.FORWARD -> pos.copy(horizontal = pos.horizontal + instruction.value)
-                Command.UP -> pos.copy(depth = pos.depth - instruction.value)
-                Command.DOWN -> pos.copy(depth = pos.depth + instruction.value)
-            }
-        }
-        return finalPosition.horizontal * finalPosition.depth
-    }
-
-    fun part2(input: List<Instruction>): Int {
-        val finalPosition = input.fold(Position()) { pos, instruction ->
-            when (instruction.type) {
-                Command.FORWARD -> pos.copy(
-                    horizontal = pos.horizontal + instruction.value,
-                    depth = pos.depth + instruction.value * pos.aim
-                )
-                Command.UP -> pos.copy(aim = pos.aim - instruction.value)
-                Command.DOWN -> pos.copy(aim = pos.aim + instruction.value)
-            }
-        }
-        return finalPosition.horizontal * finalPosition.depth
-    }
-
-
     val testInput = toCommands(readInput(2, "test_input"))
     val input = toCommands(readInput(2, "input"))