From 0f5e7f7907f17817cabb80cf51219ef8458f139d Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sat, 7 Dec 2019 11:54:43 -0500
Subject: [PATCH] Clean up day 7

---
 lib/day7/day7.ex | 45 +++++++++++----------------------------------
 1 file changed, 11 insertions(+), 34 deletions(-)

diff --git a/lib/day7/day7.ex b/lib/day7/day7.ex
index 02fa431..ddbdf74 100644
--- a/lib/day7/day7.ex
+++ b/lib/day7/day7.ex
@@ -14,40 +14,11 @@ defmodule Day7 do
   end
 
   def test_inputs(digits) do
-    Enum.reduce(digits, 0, &run_amplifier/2)
-  end
-
-  def run_amplifier(phase_setting, prev_output) do
-    program = File.read!("lib/day7/input.txt") |> String.trim()
-    # program = "3,15,3,16,1002,16,10,16,1,16,15,15,4,15,99,0,0"
-    # program = "3,23,3,24,1002,24,10,24,1002,23,-1,23,101,5,23,23,1,24,23,23,4,23,99,0,0"
-    # program =
-    # "3,31,3,32,1002,32,10,32,1001,31,-2,31,1007,31,0,33,1002,33,7,33,1,33,31,31,1,32,31,31,4,31,99,0,0,0"
-
-    program =
-      program
-      |> String.split(",")
-      |> Enum.map(&String.to_integer/1)
-
-    parent = self()
-
-    pid =
-      spawn(fn ->
-        Day5.run(program, parent)
-      end)
-
-    receive do
-      {:in, ^pid} -> send(pid, {:in, phase_setting})
-    end
-
-    receive do
-      {:in, ^pid} -> send(pid, {:in, prev_output})
-    end
-
-    receive do
-      {:out, ^pid, val} ->
-        val
-    end
+    Enum.reduce(digits, 0, fn phase_setting, prev_output ->
+      phase_setting
+      |> start_amplifier()
+      |> amplifier_step(prev_output)
+    end)
   end
 
   def permutations([]), do: [[]]
@@ -74,6 +45,12 @@ defmodule Day7 do
 
   def start_amplifier(phase_setting) do
     program = File.read!("lib/day7/input.txt") |> String.trim()
+    # part 1 examples:
+    # program = "3,15,3,16,1002,16,10,16,1,16,15,15,4,15,99,0,0"
+    # program = "3,23,3,24,1002,24,10,24,1002,23,-1,23,101,5,23,23,1,24,23,23,4,23,99,0,0"
+    # program =
+    # "3,31,3,32,1002,32,10,32,1001,31,-2,31,1007,31,0,33,1002,33,7,33,1,33,31,31,1,32,31,31,4,31,99,0,0,0"
+    # part 2 examples:
     # program =
     #   "3,26,1001,26,-4,26,3,27,1002,27,2,27,1,27,26,27,4,27,1001,28,-1,28,1005,28,6,99,0,0,5"
     # program =