From 0664894ef20a87d8badcc54a6eba5500c056302a Mon Sep 17 00:00:00 2001
From: Anthony Cerruti <soren@disroot.org>
Date: Sat, 7 Dec 2019 15:08:52 -0800
Subject: [PATCH] Day 7 part 1 (part 2 kinda stupid)

---
 aoc/src/main/scala/aoc/y2019/Day07.scala   | 33 ++++++++++++++++++++++
 aoc/src/main/scala/aoc/y2019/package.scala |  1 +
 2 files changed, 34 insertions(+)
 create mode 100644 aoc/src/main/scala/aoc/y2019/Day07.scala

diff --git a/aoc/src/main/scala/aoc/y2019/Day07.scala b/aoc/src/main/scala/aoc/y2019/Day07.scala
new file mode 100644
index 0000000..155f539
--- /dev/null
+++ b/aoc/src/main/scala/aoc/y2019/Day07.scala
@@ -0,0 +1,33 @@
+package aoc.y2019
+
+import aoc.Day
+
+import scala.annotation.tailrec
+
+object Day07 extends Day {
+
+  @tailrec def runAmplifiers(machine: Intcode.Machine, order: IndexedSeq[Int], input: Int = 0): Int = {
+    if(order.isEmpty) {
+      input
+    } else {
+      val firstInput = order.head
+      val secondInput = input
+      val runAmplifier =  for {
+        _ <- Intcode.input(firstInput)
+        _ <- Intcode.input(secondInput)
+        ran <- Intcode.run
+      } yield ran
+      val output = runAmplifier.runS(machine).value.output.head
+      runAmplifiers(machine, order.tail, output)
+    }
+  }
+
+  override def part1(input: String): String = {
+    val memory = input.split(",").toVector.map(_.toInt)
+    val initialState = Intcode.Machine(memory)
+    val maximumSignal = (0 to 4).permutations.map(runAmplifiers(initialState, _)).max
+    maximumSignal.toString
+  }
+
+  override def part2(input: String): String = ???
+}
diff --git a/aoc/src/main/scala/aoc/y2019/package.scala b/aoc/src/main/scala/aoc/y2019/package.scala
index a525f72..5f9e29f 100644
--- a/aoc/src/main/scala/aoc/y2019/package.scala
+++ b/aoc/src/main/scala/aoc/y2019/package.scala
@@ -9,6 +9,7 @@ package object y2019 extends Year {
     "4" -> Day04,
     "5" -> Day05,
     "6" -> Day06,
+    "7" -> Day07,
   )
 
 }