WAiting for approval of this function.

src/prob2/mod.rs

@@ -55,10 +55,38 @@ impl Into<i32> for ResultPlay {
     }
 }
 
-pub fn winning(play: Play) -> char {
-    match play {
-        Play::Rock => Play::Paper.into(),
-        Play::Paper => Play::Scissors.into(),
-        Play::Scissors => Play::Rock.into(),
+pub fn round_score(play: char, counter_play: char) -> i32 {
+    let coup = Play::from(play); // translate to the play
+    let counter = Play::from(counter_play); // translate to the play
+    if coup == counter {
+        (ResultPlay::Draw as i32) + (counter_play as i32)
+    } else {
+        use Play::*;
+        use ResultPlay::*;
+        match (&coup, &counter) {
+            (Rock, Paper) => (Win as i32) + (counter as i32),
+            (Rock, Scissors) => (Loss as i32) + (counter as i32),
+            (Paper, Rock) => (Loss as i32) + (counter as i32),
+            (Paper, Scissors) => (Win as i32) + (counter as i32),
+            (Scissors, Rock) => (Win as i32) + (counter as i32),
+            (Scissors, Paper) => (Loss as i32) + (counter as i32),
+            _ => panic!("Case not covered, impossible to reach."),
+        }
     }
 }
+
+pub fn solve_part1(file_path: &str) -> i32 {
+    let contents =
+        std::fs::read_to_string(file_path).expect("Please provide a text file as an argument.");
+    let lines: Vec<&str> = contents.split('\n').collect();
+    lines
+        .iter()
+        .map(|line| {
+            let first: char = line.chars().nth(0).unwrap_or('R');
+            let last: char = line.chars().nth(2).unwrap_or('R');
+            round_score(first, last)
+        })
+        .collect::<Vec<i32>>()
+        .iter()
+        .sum()
+}