From df5cfbd0304f006b73fc300f5a3a77319379f205 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anders=20Ytterstr=C3=B6m?= <yttan@fastmail.se>
Date: Fri, 2 Dec 2022 10:45:42 +0100
Subject: [PATCH] Add solutions for 2022:2 Rock Paper Scissors

Verbose code, and with bad naming. Good enough for now.
---
 2022-elixir/lib/solutions/day_02.ex        | 96 ++++++++++++++++++++++
 2022-elixir/test/solutions/day_02_test.exs | 27 ++++++
 2 files changed, 123 insertions(+)
 create mode 100644 2022-elixir/lib/solutions/day_02.ex
 create mode 100644 2022-elixir/test/solutions/day_02_test.exs

diff --git a/2022-elixir/lib/solutions/day_02.ex b/2022-elixir/lib/solutions/day_02.ex
new file mode 100644
index 0000000..9d98761
--- /dev/null
+++ b/2022-elixir/lib/solutions/day_02.ex
@@ -0,0 +1,96 @@
+defmodule Aoc.Solution.Day02 do
+  import Aoc.Utils
+
+  @name "Day 2: Rock Paper Scissors"
+  @behaviour Solution
+
+  @impl Solution
+  def get_name, do: @name
+
+  @impl Solution
+  def present(solution), do: "Asumed strategy guide will grant #{solution} total score"
+
+  @impl Solution
+  def present_again(solution), do: "Actual strategy guide will grant #{solution} total score"
+
+  @impl Solution
+  def parse!(raw) do
+    raw |> split_lines() |> Enum.map(&parse_values/1)
+  end
+
+  @impl Solution
+  def solve(rounds) do
+    rounds |> Enum.map(&asumed_score/1) |> Enum.sum()
+  end
+
+  @impl Solution
+  def solve_again(rounds) do
+    rounds |> Enum.map(&score/1) |> Enum.sum()
+  end
+
+  def asumed_score([opponent, "X"]) do
+    result =
+      case opponent do
+        "A" -> 3
+        "B" -> 0
+        "C" -> 6
+      end
+
+    result + 1
+  end
+
+  def asumed_score([opponent, "Y"]) do
+    result =
+      case opponent do
+        "A" -> 6
+        "B" -> 3
+        "C" -> 0
+      end
+
+    result + 2
+  end
+
+  def asumed_score([opponent, "Z"]) do
+    result =
+      case opponent do
+        "A" -> 0
+        "B" -> 6
+        "C" -> 3
+      end
+
+    result + 3
+  end
+
+  def score([opponent, "X"]) do
+    result =
+      case opponent do
+        "A" -> 3
+        "B" -> 1
+        "C" -> 2
+      end
+
+    result
+  end
+
+  def score([opponent, "Y"]) do
+    result =
+      case opponent do
+        "A" -> 1
+        "B" -> 2
+        "C" -> 3
+      end
+
+    result + 3
+  end
+
+  def score([opponent, "Z"]) do
+    result =
+      case opponent do
+        "A" -> 2
+        "B" -> 3
+        "C" -> 1
+      end
+
+    result + 6
+  end
+end
diff --git a/2022-elixir/test/solutions/day_02_test.exs b/2022-elixir/test/solutions/day_02_test.exs
new file mode 100644
index 0000000..32230cc
--- /dev/null
+++ b/2022-elixir/test/solutions/day_02_test.exs
@@ -0,0 +1,27 @@
+defmodule Day02Test do
+  use ExUnit.Case
+  doctest Aoc.Solution.Day02
+  import Aoc.Solution.Day02
+
+  @input ~s(
+    A Y
+    B X
+    C Z
+  )
+
+  test "02: Rock Paper Scissors, part 1" do
+    expected = 15
+
+    result = @input |> parse!() |> solve()
+
+    assert result == expected
+  end
+
+  test "02: Rock Paper Scissors, part 2" do
+    expected = 12
+
+    result = @input |> parse!() |> solve_again()
+
+    assert result == expected
+  end
+end