From b8596fd912be1215f652431b79c01ca3d9818f07 Mon Sep 17 00:00:00 2001
From: Michael <michael@preisach.at>
Date: Sat, 21 Dec 2019 18:42:35 +0100
Subject: [PATCH] day2 works

---
 src/day2.rs | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs | 12 +++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 src/day2.rs

diff --git a/src/day2.rs b/src/day2.rs
new file mode 100644
index 0000000..c184c82
--- /dev/null
+++ b/src/day2.rs
@@ -0,0 +1,72 @@
+// #[derive(Copy, Clone)]
+pub struct Data {
+    pub program: Vec<u32>,
+}
+
+impl Data {
+    pub fn new() -> Data {
+        Data {
+            program: Vec::new(),
+        }
+    }
+
+    pub fn parse(&mut self, input: String) {
+        for line in input.split(",") {
+            let sline = line.to_string();
+            // println!("{}", sline);
+            self.program.push(match sline.parse::<u32>() {
+                Ok(i) => i,
+                Err(_) => 0,
+            });
+        }
+    }
+
+    pub fn compute1(&mut self) -> u32 {
+        let mut pc: usize = 0;
+        while pc < self.program.len() {
+            let opcode = self.program[pc];
+            match opcode {
+                1 | 2 => {
+                    if self.program.len() < pc + 3 {
+                        break;
+                    }
+                    let arg1 = self.program[pc + 1] as usize;
+                    let arg2 = self.program[pc + 2] as usize;
+                    let res = self.program[pc + 3] as usize;
+                    match opcode {
+                        1 => self.program[res] = self.program[arg1] + self.program[arg2],
+                        2 => self.program[res] = self.program[arg1] * self.program[arg2],
+                        _ => {}
+                    };
+                }
+                99 => break,
+                _ => {
+                    println!(
+                        "An Error happened: Instruction {} at pos {}",
+                        self.program[pc], pc
+                    );
+                    break;
+                }
+            }
+            pc += 4;
+        }
+        self.program[0]
+    }
+
+    pub fn compute2(&self) -> u32 {
+        let mut result = 0u32;
+        let mut value = 0u32;
+
+        while result != 19690720 && value < 10000 {
+            let mut data = Data::new();
+            data.program = vec![0; self.program.len()];
+            data.program.copy_from_slice(&self.program);
+            data.program[1] = value / 100 as u32;
+            data.program[2] = value % 100 as u32;
+            // println!("{:?}", data.program);
+            result = data.compute1();
+            value += 1;
+        }
+        value - 1
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 3ed5574..bdcb3e6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,7 @@ use std::fs::File;
 use std::io::Read;
 
 mod day1;
+mod day2;
 mod tests;
 
 fn main() {
@@ -16,6 +17,17 @@ fn main() {
             println!("Error: {}", msg);
         }
     }
+    match read_file("../day2.txt") {
+        Ok(input) => {
+            let mut data = day2::Data::new();
+            data.parse(input);
+            println!("Day2 Challenge1 result = {}", data.compute1());
+            println!("Day2 Challenge2 result = {}", data.compute2());
+        }
+        Err(msg) => {
+            println!("Error: {}", msg);
+        }
+    }
 }
 
 fn read_file(filename: &str) -> Result<String, std::io::Error> {