day 1 complete :^)

day_1/src/main.rs

@@ -1,3 +1,61 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+
+
+
+
 fn main() {
-    println!("Hello, world!");
+    let DEBUG = false;
+    let current_path = std::env::current_dir().unwrap();
+    let res = rfd::FileDialog::new().set_directory(&current_path).pick_file().unwrap();
+    let list = File::open(res.as_path()).unwrap();
+    let mut elf_counter:u8 = 0;
+    let mut calorie_counter:u32 = 0;
+    let mut lowest_max_elf: u8 = 0;
+    let mut lowest_max_calories: u32 = 0;
+    let mut top_elves:Vec<elf> = Vec::new();
+    let reader = BufReader::new(list);
+    for line in reader.lines(){
+        if (DEBUG) {
+            println!("DEBUG: parsing line {}", line.as_ref().unwrap())
+        }
+        if (line.as_ref().unwrap() == "") {
+            elf_counter += 1;
+            println!("elf {} has {} calories", elf_counter, calorie_counter);
+            if (lowest_max_calories < calorie_counter || top_elves.len() < 3) {
+                (lowest_max_calories, lowest_max_elf) = check_elf(elf_counter, calorie_counter, lowest_max_elf.clone(), lowest_max_calories.clone(), &mut top_elves);
+            }
+            calorie_counter = 0;
+        } else {
+            calorie_counter += line.unwrap().parse::<u32>().unwrap();
+        }
+    }
+    check_elf(elf_counter+1, calorie_counter, lowest_max_elf, lowest_max_calories, &mut top_elves);
+    println!("the top 3 elves were:");
+    let last = top_elves.pop().unwrap();
+    println!("at third place with {} calories we've got elf {}", last.calories, last.id);
+    let second = top_elves.pop().unwrap();
+    println!("at second place with {} calories we've got elf {}", second.calories, second.id);
+    let first = top_elves.pop().unwrap();
+    println!("and at first place with {} calories we've got elf {}", first.calories, first.id);
+    let combined:u32 = last.calories + second.calories + first.calories;
+    println!("which gives us a combined total of {} calories for the top 3", combined)
 }
+
+fn check_elf(mut elf_counter: u8, mut calorie_counter: u32, mut lowest_max_elf: u8, mut lowest_max_calories: u32, top_elves: &mut Vec<elf>) -> (u32, u8) {
+    top_elves.push(elf { id: elf_counter, calories: calorie_counter });
+    top_elves.sort_by(|a, b| b.calories.cmp(&a.calories));
+    if (top_elves.len() > 3) {
+        top_elves.pop(); //pop last element from the list if there are more than 3 items
+    }
+    lowest_max_calories = top_elves.last().unwrap().calories.clone();
+    lowest_max_elf = top_elves.last().unwrap().id.clone();
+    return (lowest_max_calories, lowest_max_elf)
+}
+
+
+struct elf {
+    id: u8,
+    calories: u32,
+}