From cc9288b7e8bebaf5828d53ecd88ca316a1840b42 Mon Sep 17 00:00:00 2001
From: Justin Wernick <justin@worthe-it.co.za>
Date: Tue, 8 Dec 2020 20:50:41 +0200
Subject: Day 8

---
 inputs/day_8.txt | 626 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/bin/day_8.rs | 153 ++++++++++++++
 2 files changed, 779 insertions(+)
 create mode 100644 inputs/day_8.txt
 create mode 100644 src/bin/day_8.rs

diff --git a/inputs/day_8.txt b/inputs/day_8.txt
new file mode 100644
index 0000000..5ef799e
--- /dev/null
+++ b/inputs/day_8.txt
@@ -0,0 +1,626 @@
+acc +48
+nop +308
+acc +33
+acc +48
+jmp +379
+acc +27
+acc +23
+acc +29
+acc +3
+jmp +326
+acc -12
+nop +248
+nop +146
+jmp +293
+acc +8
+acc -16
+acc +18
+jmp +255
+jmp +390
+jmp +442
+acc +38
+jmp +451
+jmp +499
+acc +41
+acc +44
+nop +298
+acc +31
+jmp +337
+acc -3
+acc +34
+nop +266
+acc -19
+jmp +281
+jmp +232
+acc -9
+acc +25
+acc -8
+nop +228
+jmp +79
+jmp +58
+acc +38
+nop +318
+jmp +17
+acc +44
+jmp +298
+acc -4
+jmp +196
+jmp +249
+acc -9
+acc -3
+acc +17
+jmp +556
+jmp +1
+acc -15
+jmp +166
+acc +23
+acc +10
+acc +39
+jmp +475
+acc +28
+jmp +41
+jmp +322
+acc +48
+acc -11
+acc -13
+acc +12
+jmp +92
+jmp +1
+acc +9
+jmp -26
+acc +4
+acc -8
+nop +484
+acc -14
+jmp +526
+acc -13
+acc -2
+acc -13
+jmp +419
+acc +22
+acc -17
+jmp +1
+jmp +151
+acc +3
+acc +2
+acc -13
+acc -11
+jmp +352
+acc +24
+jmp -27
+nop +206
+acc +22
+nop +225
+jmp +360
+acc +48
+jmp +105
+jmp +80
+acc -16
+jmp +89
+acc +0
+jmp +339
+acc +37
+acc +41
+nop +156
+jmp +452
+jmp +208
+nop +60
+jmp +155
+acc -16
+jmp +274
+nop -77
+acc -16
+acc +21
+jmp +508
+acc -7
+acc -1
+jmp -83
+acc -11
+jmp +28
+acc +3
+acc +32
+acc -18
+jmp -89
+acc +4
+acc -14
+acc -1
+acc +33
+jmp -75
+nop +185
+acc +8
+acc +22
+acc +26
+jmp +164
+acc -19
+jmp +260
+jmp +174
+acc +2
+acc +34
+jmp -120
+acc -15
+acc +48
+jmp +165
+acc +5
+nop +240
+jmp -121
+jmp +114
+jmp -36
+nop +432
+jmp +1
+acc -18
+jmp +429
+acc +44
+nop +110
+jmp +198
+acc -18
+acc +32
+acc +41
+jmp +102
+nop +177
+acc +35
+acc +24
+acc +46
+jmp +121
+acc +20
+jmp +1
+jmp +407
+jmp +1
+acc +35
+acc +46
+nop -18
+jmp +6
+jmp +422
+acc -19
+jmp -85
+acc +33
+jmp -116
+nop +79
+jmp +284
+acc +3
+acc +49
+nop +317
+jmp +6
+acc +6
+jmp +295
+nop -141
+acc -4
+jmp -44
+nop +155
+acc +48
+acc -17
+jmp +188
+acc +22
+jmp +286
+nop +103
+acc -2
+acc +45
+jmp +20
+acc +21
+acc +37
+jmp +235
+jmp +42
+acc -11
+nop -15
+acc -5
+jmp +235
+jmp +178
+acc +12
+acc -15
+jmp +25
+acc +9
+acc +11
+nop +389
+acc +50
+jmp +146
+acc +26
+jmp +144
+acc -14
+jmp +304
+nop +254
+jmp +337
+jmp +17
+jmp +1
+acc +6
+acc -4
+acc +42
+jmp +117
+acc +25
+acc +50
+acc +45
+jmp -112
+acc +14
+acc +27
+jmp +347
+nop +15
+jmp +14
+acc +29
+jmp +236
+jmp -71
+acc -11
+acc +21
+nop +32
+jmp -162
+acc -15
+jmp +322
+acc -4
+acc +16
+jmp +1
+jmp +100
+jmp +1
+jmp -77
+acc +21
+nop -199
+acc +49
+acc -1
+jmp -231
+jmp +230
+acc -19
+jmp +1
+jmp -49
+jmp -11
+acc +6
+jmp -110
+jmp +331
+acc +44
+jmp +292
+acc -7
+acc -18
+acc +50
+jmp +221
+acc +33
+acc +7
+jmp -45
+jmp +342
+acc -19
+acc +36
+acc +15
+jmp -229
+nop -5
+jmp +57
+acc +26
+acc +43
+nop -175
+jmp +82
+acc +45
+jmp -161
+acc -16
+acc +35
+acc +46
+acc +43
+jmp +1
+nop +195
+acc +39
+acc +27
+acc +32
+jmp +227
+jmp -272
+nop +201
+acc +6
+acc +13
+acc +12
+jmp -177
+acc -9
+acc +46
+nop +199
+acc -1
+jmp +1
+jmp +3
+acc +42
+jmp +75
+jmp +305
+acc +49
+acc -16
+jmp -92
+acc +3
+nop +279
+jmp +54
+jmp +31
+acc +50
+jmp -125
+acc +21
+nop -178
+acc +40
+jmp +193
+acc +39
+acc -5
+jmp +261
+nop -3
+acc -13
+jmp -310
+acc +6
+acc -17
+acc +12
+acc +38
+jmp +267
+jmp -311
+acc -2
+jmp -7
+nop +77
+acc -2
+acc +39
+acc -16
+jmp +10
+nop +59
+jmp -296
+acc -4
+acc +41
+jmp -249
+acc +43
+nop +35
+jmp +95
+jmp +171
+acc +10
+nop +169
+acc -17
+jmp +47
+acc +49
+acc +38
+nop +199
+jmp +249
+jmp -53
+nop -194
+acc +19
+acc +18
+jmp -16
+acc +33
+jmp +194
+nop -194
+acc +49
+jmp +85
+acc +50
+nop -318
+acc -7
+jmp -49
+acc -6
+acc +48
+acc -13
+acc -14
+jmp +67
+acc +12
+acc +19
+acc +3
+jmp -371
+jmp -149
+acc +49
+nop -202
+jmp -315
+acc -6
+jmp -171
+acc -7
+jmp +113
+acc +34
+acc +36
+acc +17
+jmp -97
+acc +3
+jmp -244
+acc +25
+acc +30
+acc +25
+acc -19
+jmp +44
+nop +84
+jmp +124
+nop +17
+acc -11
+acc -8
+acc +4
+jmp +193
+jmp -388
+acc +36
+acc +17
+jmp +1
+acc -5
+jmp +166
+acc +39
+acc -10
+jmp -280
+acc +15
+jmp +1
+jmp -396
+jmp +113
+acc +37
+acc +13
+jmp -35
+nop +109
+acc +8
+acc +6
+acc +19
+jmp +39
+jmp +1
+jmp +1
+acc +39
+acc -14
+jmp -291
+acc +39
+acc +31
+jmp -231
+acc +41
+jmp -55
+nop -167
+jmp +105
+acc -8
+acc +34
+jmp -114
+nop +58
+jmp +1
+nop -270
+acc +31
+jmp -135
+acc +8
+acc +33
+jmp +1
+jmp -64
+acc +24
+acc +16
+jmp +117
+acc +35
+acc -11
+nop +44
+acc +18
+jmp +1
+jmp +88
+acc +29
+nop +34
+jmp +1
+nop -118
+jmp -404
+jmp -144
+acc -12
+nop -372
+acc -14
+jmp -209
+acc +12
+jmp +1
+acc -1
+jmp +132
+nop -93
+jmp -130
+acc +23
+acc +30
+acc +3
+jmp -209
+nop -381
+acc -19
+jmp +23
+nop +87
+jmp -277
+acc +39
+jmp -391
+acc +14
+acc +18
+acc +24
+nop -459
+jmp -267
+acc +35
+nop +84
+jmp -231
+acc +5
+acc +0
+acc +45
+jmp -210
+jmp -211
+acc +7
+acc +8
+nop -249
+jmp -8
+jmp -105
+nop -455
+acc -19
+acc +36
+jmp -368
+acc +33
+acc +10
+acc +9
+jmp -259
+nop +41
+acc -14
+acc +2
+jmp -336
+acc +46
+jmp -261
+nop -284
+acc +21
+nop -154
+jmp -485
+jmp -505
+acc +32
+nop -327
+acc +1
+nop +43
+jmp -23
+acc -7
+jmp -88
+acc +10
+jmp -440
+acc +12
+jmp -430
+jmp +1
+acc +46
+nop -105
+jmp -87
+acc +49
+acc -10
+acc -6
+jmp -411
+jmp -268
+acc +35
+acc +15
+jmp +45
+acc -14
+acc +0
+jmp -234
+nop -67
+acc +32
+acc +1
+jmp -476
+jmp -297
+nop -274
+jmp -435
+acc +36
+acc -2
+acc +33
+acc +9
+jmp -26
+jmp +50
+acc +23
+jmp -172
+jmp +1
+acc +34
+acc +32
+acc -4
+jmp -312
+acc -11
+acc +26
+jmp -150
+acc +41
+nop -79
+acc +25
+jmp -76
+acc -2
+acc +29
+acc +12
+jmp -549
+nop -357
+nop -438
+jmp -320
+acc +7
+acc -6
+jmp -149
+nop -74
+acc +7
+acc +45
+jmp -383
+acc -8
+acc +5
+acc +12
+jmp -463
+acc -17
+acc +5
+jmp -34
+jmp +1
+acc +18
+jmp -523
+acc +38
+acc +35
+nop -222
+jmp -424
+nop -365
+jmp -188
+acc +0
+acc +7
+nop -167
+acc +27
+jmp -351
+acc +26
+jmp -201
+nop -208
+nop -466
+acc +50
+nop -531
+jmp -273
+acc +21
+acc +25
+nop -397
+acc +29
+jmp +1
diff --git a/src/bin/day_8.rs b/src/bin/day_8.rs
new file mode 100644
index 0000000..c7df9f5
--- /dev/null
+++ b/src/bin/day_8.rs
@@ -0,0 +1,153 @@
+use bevy::{app::AppExit, prelude::*};
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::{collections::BTreeMap, convert::TryFrom};
+
+fn main() {
+    App::build()
+        .add_resource(WindowDescriptor {
+            title: "Advent of Code".to_string(),
+            width: 1920,
+            height: 1080,
+            ..Default::default()
+        })
+        .add_resource(ClearColor(Color::rgb(0., 0., 0.)))
+        .add_startup_system(setup_camera.system())
+        .add_startup_system(read_input_file.system())
+        .add_stage("check_line")
+        .add_system_to_stage("check_line", track_program_line_execution.system())
+        .add_system_to_stage("check_line", track_program_termination.system())
+        .add_stage("exec")
+        .add_system_to_stage("exec", tick_computer.system())
+        .add_system_to_stage("exec", exit.system())
+        .add_plugins(DefaultPlugins)
+        .run();
+}
+
+fn setup_camera(mut commands: Commands) {
+    commands.spawn(Camera2dComponents::default());
+}
+
+struct Program {
+    ops: Vec<Op>,
+}
+#[derive(Clone)]
+enum Op {
+    Acc(i32),
+    Jmp(i32),
+    Nop(i32),
+}
+struct UnalteredProgram;
+#[derive(Default)]
+struct Computer {
+    program_counter: i32,
+    accumulator: i32,
+    termiated: bool,
+}
+#[derive(Default)]
+struct LineTracker(BTreeMap<i32, usize>);
+
+impl Computer {
+    fn exec(&mut self, program: &Program) {
+        if self.termiated {
+            return;
+        }
+
+        let x = usize::try_from(self.program_counter).ok();
+        match x.and_then(|x| program.ops.get(x)) {
+            None => {}
+            Some(Op::Acc(val)) => {
+                self.accumulator += val;
+                self.program_counter += 1;
+            }
+            Some(Op::Jmp(val)) => {
+                self.program_counter += val;
+            }
+            Some(Op::Nop(_)) => {
+                self.program_counter += 1;
+            }
+        }
+        if self.program_counter >= program.ops.len() as i32 {
+            self.termiated = true;
+        }
+    }
+}
+
+fn read_input_file(mut commands: Commands) {
+    let f = File::open("./inputs/day_8.txt").unwrap();
+
+    let ops: Vec<Op> = BufReader::new(f)
+        .lines()
+        .map(|line| {
+            let line = line.unwrap();
+            let line = line.trim();
+
+            let mut line_parts = line.split_whitespace();
+            let opcode = line_parts.next().unwrap();
+            let val: i32 = line_parts.next().unwrap().parse().unwrap();
+            let op = match opcode {
+                "acc" => Op::Acc(val),
+                "jmp" => Op::Jmp(val),
+                "nop" => Op::Nop(val),
+                _ => panic!("Invalid opcode"),
+            };
+            op
+        })
+        .collect();
+    commands.spawn((
+        UnalteredProgram,
+        Program { ops: ops.clone() },
+        Computer::default(),
+        LineTracker::default(),
+    ));
+
+    for i in 0..ops.len() {
+        let mut ops = ops.clone();
+        ops[i] = match ops[i] {
+            Op::Nop(v) => Op::Jmp(v),
+            Op::Jmp(v) => Op::Nop(v),
+            Op::Acc(v) => Op::Acc(v),
+        };
+        commands.spawn((
+            Program { ops: ops.clone() },
+            Computer::default(),
+            LineTracker::default(),
+        ));
+    }
+}
+
+fn track_program_line_execution(
+    mut commands: Commands,
+    entity: Entity,
+    mut line_tracker: Mut<LineTracker>,
+    computer: &Computer,
+    unaltered: Option<&UnalteredProgram>,
+) {
+    *line_tracker.0.entry(computer.program_counter).or_insert(0) += 1;
+    if *line_tracker.0.get(&computer.program_counter).unwrap() > 1 {
+        if unaltered.is_some() {
+            println!(
+                "About to execute a line for the second time! Line {}. Accumulator: {}",
+                computer.program_counter, computer.accumulator
+            );
+        }
+        commands.despawn(entity);
+    }
+}
+
+fn track_program_termination(mut commands: Commands, entity: Entity, computer: &Computer) {
+    if computer.termiated {
+        println!("Program terminated! Accumulator: {}", computer.accumulator);
+        commands.despawn(entity);
+    }
+}
+
+fn tick_computer(mut computer: Mut<Computer>, program: &Program) {
+    computer.exec(program);
+}
+
+fn exit(mut exit_events: ResMut<Events<AppExit>>, computers: Query<&Computer>) {
+    if computers.iter().len() == 0 {
+        exit_events.send(AppExit);
+    }
+}
-- 
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