From 60bf2180f94a4ae4f3a12fe9b469f559d345a403 Mon Sep 17 00:00:00 2001
From: Justin Worthe <justin@worthe-it.co.za>
Date: Fri, 22 Dec 2017 07:24:47 +0200
Subject: Day 22: Viruses on a plane

---
 src/bin/day_22.rs | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

(limited to 'src')

diff --git a/src/bin/day_22.rs b/src/bin/day_22.rs
index 1fc3eca..917ed63 100644
--- a/src/bin/day_22.rs
+++ b/src/bin/day_22.rs
@@ -1,6 +1,73 @@
 extern crate advent_of_code_2017;
 use advent_of_code_2017::*;
 
+use std::collections::HashSet;
+
 fn main() {
     let args = AdventArgs::init();
+    let input_width = args.input[0].len();
+    let input_height = args.input.len();
+
+    let mut position = Point {
+        x: (input_width / 2) as i32,
+        y: (input_height / 2) as i32,
+    };
+    let mut direction = Direction::Up;
+
+    let mut weakened: HashSet<Point> = HashSet::new();
+    let mut infected: HashSet<Point> = HashSet::new();
+    let mut flagged: HashSet<Point> = HashSet::new();
+    
+    for (y, line) in args.input.iter().enumerate() {
+        for (x, c) in line.chars().enumerate() {
+            if c == '#' {
+                infected.insert(Point {
+                    x: x as i32,
+                    y: y as i32
+                });
+            }
+        }
+    }
+
+    let mut infections_caused = 0;
+
+    let bursts = if args.part == 1 {
+        10_000
+    } else {
+        10_000_000
+    };
+    
+    for _ in 0..bursts {
+        if args.part == 1 {
+            if infected.contains(&position) {
+                direction = direction.rotate_right();
+                infected.remove(&position);
+            } else {
+                direction = direction.rotate_left();
+                infected.insert(position);
+                infections_caused += 1;
+            }
+        }
+        else {
+            if weakened.contains(&position) {
+                infected.insert(position);
+                weakened.remove(&position);
+                infections_caused += 1;
+            } else if infected.contains(&position) {
+                direction = direction.rotate_right();
+                flagged.insert(position);
+                infected.remove(&position);
+            } else if flagged.contains(&position) {
+                direction = direction.rotate_right().rotate_right();
+                flagged.remove(&position);
+            } else {
+                direction = direction.rotate_left();
+                weakened.insert(position);
+            }
+        }
+        position = position.shift(&direction);
+    }
+
+    println!("Infections caused {}", infections_caused);
+    
 }
-- 
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