From e84c13c68968a51c9d81dacae36db4188e61a9f7 Mon Sep 17 00:00:00 2001
From: Pierre Jeanjean <rhiobet@gmail.com>
Date: Fri, 2 Dec 2022 07:41:32 +0100
Subject: [PATCH] Day 2

---
 day02/common/round.go | 47 +++++++++++++++++++++++++++++++++++++++++++
 day02/ex1/main.go     | 46 ++++++++++++++++++++++++++++++++++++++++++
 day02/ex2/main.go     | 47 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 140 insertions(+)
 create mode 100644 day02/common/round.go
 create mode 100644 day02/ex1/main.go
 create mode 100644 day02/ex2/main.go

diff --git a/day02/common/round.go b/day02/common/round.go
new file mode 100644
index 0000000..59d34f2
--- /dev/null
+++ b/day02/common/round.go
@@ -0,0 +1,47 @@
+package common
+
+type Move int
+
+const (
+  Rock Move = iota
+  Paper
+  Scissor
+)
+
+type Round struct {
+  Opponent Move
+  Response Move
+}
+
+func (round Round) GetScore() int {
+  score := 0
+  switch round {
+    case Round{Rock, Rock}:
+      score += 4
+    case Round{Rock, Paper}:
+      score += 8
+    case Round{Rock, Scissor}:
+      score += 3
+    case Round{Paper, Rock}:
+      score += 1
+    case Round{Paper, Paper}:
+      score += 5
+    case Round{Paper, Scissor}:
+      score += 9
+    case Round{Scissor, Rock}:
+      score += 7
+    case Round{Scissor, Paper}:
+      score += 2
+    case Round{Scissor, Scissor}:
+      score += 6
+  }
+  return score
+}
+
+func GetTotalScore(rounds []Round) int {
+  score := 0
+  for _, round := range rounds {
+    score += round.GetScore()
+  }
+  return score
+}
diff --git a/day02/ex1/main.go b/day02/ex1/main.go
new file mode 100644
index 0000000..e99f582
--- /dev/null
+++ b/day02/ex1/main.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+  "bufio"
+  "fmt"
+  "os"
+  "aoc2022/day02/common"
+)
+
+func Parse(scanner bufio.Scanner) []common.Round {
+  rounds := []common.Round{}
+
+  for scanner.Scan() {
+    line := scanner.Text()
+
+    var opponent common.Move
+    switch line[0] {
+      case 'A':
+        opponent = common.Rock
+      case 'B':
+        opponent = common.Paper
+      case 'C':
+        opponent = common.Scissor
+    }
+
+    var response common.Move
+    switch line[2] {
+      case 'X':
+        response = common.Rock
+      case 'Y':
+        response = common.Paper
+      case 'Z':
+        response = common.Scissor
+    }
+
+    rounds = append(rounds, common.Round{Opponent: opponent, Response: response})
+  }
+
+  return rounds
+}
+
+func main() {
+  rounds := Parse(*bufio.NewScanner(os.Stdin))
+
+  fmt.Println(common.GetTotalScore(rounds))
+}
diff --git a/day02/ex2/main.go b/day02/ex2/main.go
new file mode 100644
index 0000000..522d533
--- /dev/null
+++ b/day02/ex2/main.go
@@ -0,0 +1,47 @@
+package main
+
+import (
+  "bufio"
+  "fmt"
+  "os"
+  "aoc2022/day02/common"
+)
+
+func Parse(scanner bufio.Scanner) []common.Round {
+  rounds := []common.Round{}
+
+  for scanner.Scan() {
+    line := scanner.Text()
+
+    var round common.Round
+    switch line {
+      case "A X":
+        round = common.Round{Opponent: common.Rock, Response: common.Scissor}
+      case "A Y":
+        round = common.Round{Opponent: common.Rock, Response: common.Rock}
+      case "A Z":
+        round = common.Round{Opponent: common.Rock, Response: common.Paper}
+      case "B X":
+        round = common.Round{Opponent: common.Paper, Response: common.Rock}
+      case "B Y":
+        round = common.Round{Opponent: common.Paper, Response: common.Paper}
+      case "B Z":
+        round = common.Round{Opponent: common.Paper, Response: common.Scissor}
+      case "C X":
+        round = common.Round{Opponent: common.Scissor, Response: common.Paper}
+      case "C Y":
+        round = common.Round{Opponent: common.Scissor, Response: common.Scissor}
+      case "C Z":
+        round = common.Round{Opponent: common.Scissor, Response: common.Rock}
+    }
+    rounds = append(rounds, round)
+  }
+
+  return rounds
+}
+
+func main() {
+  rounds := Parse(*bufio.NewScanner(os.Stdin))
+
+  fmt.Println(common.GetTotalScore(rounds))
+}