From c4a27e82e099a537826451cd4880e56a729aba46 Mon Sep 17 00:00:00 2001
From: mitchellhansen <mitchellhansen0@gmail.com>
Date: Mon, 7 Dec 2020 21:49:57 -0800
Subject: [PATCH] day 8

---
 src/problem8/lib.rs | 87 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 84 insertions(+), 3 deletions(-)

diff --git a/src/problem8/lib.rs b/src/problem8/lib.rs
index 45fed38..d11cc2c 100644
--- a/src/problem8/lib.rs
+++ b/src/problem8/lib.rs
@@ -1,21 +1,40 @@
 
 use crate::Problem;
+use std::collections::HashSet;
 
+#[derive(Clone, Debug)]
 pub struct Problem8 {
-    number_list: Vec<i32>,
+    operations: Vec<(Op, OpAnd)>,
 }
 
+#[derive(Clone, Copy, Debug)]
+enum Op {
+    Nop,
+    Acc,
+    Jmp,
+}
+
+#[derive(Clone, Copy, Debug)]
+struct OpAnd(i32);
+
 impl Problem8 {}
 
 impl Problem for Problem8 {
     fn new(input: &String) -> Self {
         Problem8 {
-            number_list: input
+            operations: input
                 .split("\n")
                 .filter_map(|s| {
                     let s = s.trim();
                     if !s.is_empty() {
-                        Some(s.parse::<i32>().unwrap())
+                        let mut v = s.split(" ");
+                        let op = match v.next().unwrap().trim() {
+                            "nop" => {Op::Nop},
+                            "acc" => {Op::Acc},
+                            "jmp" => {Op::Jmp},
+                            _ =>{println!("unsupported operand {}", s); Op::Nop}
+                        };
+                        Some((op, OpAnd(v.next().unwrap().trim().parse::<i32>().unwrap())))
                     } else {
                         None
                     }
@@ -24,11 +43,73 @@ impl Problem for Problem8 {
     }
 
     fn run_part1(&self) {
+        return;
+        println!("{:?}", self.operations);
+
+        let mut repeats : HashSet<i32> = HashSet::default();
+        let mut pc : i32 = 0;
+        let mut acc : i32 = 0;
+        while !repeats.contains(&pc) {
+            repeats.insert(pc);
+            match self.operations.get(pc as usize).unwrap() {
+                &(Op::Nop, opand) => {
+                    pc += 1;
+                },
+                &(Op::Acc, opand) => {
+                    acc += opand.0 as i32;
+                    pc += 1;
+                },
+                &(Op::Jmp, opand) => {
+                    pc += opand.0 as i32;
+                }
+            }
+            println!("{:?}, {:?}, {:?}", pc, acc, repeats)
+        }
 
     }
 
     fn run_part2(&self) {
+        println!("{:?}", self.operations);
+
+        for (i, v) in self.operations.iter().enumerate() {
 
+            let mut base_ops = self.operations.clone();
+
+            match v {
+                &(Op::Nop, opand) => {
+                    base_ops[i] = (Op::Jmp, opand);
+                },
+                &(Op::Acc, opand) => {
+
+                },
+                &(Op::Jmp, opand) => {
+                    base_ops[i] = (Op::Nop, opand);
+                }
+            }
+
+            let mut repeats : HashSet<i32> = HashSet::default();
+            let mut pc : i32 = 0;
+            let mut acc : i32 = 0;
+            while !repeats.contains(&pc) && pc < self.operations.len() as i32{
+                repeats.insert(pc);
+                match base_ops.get(pc as usize).unwrap() {
+                    &(Op::Nop, opand) => {
+                        pc += 1;
+                    },
+                    &(Op::Acc, opand) => {
+                        acc += opand.0 as i32;
+                        pc += 1;
+                    },
+                    &(Op::Jmp, opand) => {
+                        pc += opand.0 as i32;
+                    }
+                }
+                //println!("{:?}, {:?}, {:?}", pc, acc, repeats)
+            }
+
+            println!("{:?}", acc);
+            println!("pc {:?}, len {:?}, contains {:?}", pc, repeats.contains(&pc), self.operations.len())
+        }
     }
 }