From 28223a1b34ac2764debd0b4dcd1157aa17dbf73b Mon Sep 17 00:00:00 2001
From: Rokas Puzonas <rokas.puz@gmail.com>
Date: Fri, 3 Dec 2021 01:24:33 +0200
Subject: [PATCH] feat: solve day 2 part 1

---
 input.txt => input1.txt |    0
 input2.txt              | 1000 +++++++++++++++++++++++++++++++++++++++
 src/day2.rs             |   74 +++
 src/main.rs             |   18 +-
 4 files changed, 1086 insertions(+), 6 deletions(-)
 rename input.txt => input1.txt (100%)
 create mode 100644 input2.txt
 create mode 100644 src/day2.rs

diff --git a/input.txt b/input1.txt
similarity index 100%
rename from input.txt
rename to input1.txt
diff --git a/input2.txt b/input2.txt
new file mode 100644
index 0000000..9e714f9
--- /dev/null
+++ b/input2.txt
@@ -0,0 +1,1000 @@
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diff --git a/src/day2.rs b/src/day2.rs
new file mode 100644
index 0000000..a4d4b84
--- /dev/null
+++ b/src/day2.rs
@@ -0,0 +1,74 @@
+use std::fs::File;
+use std::io::{prelude::*, self};
+use std::num::ParseIntError;
+
+#[derive(Debug)]
+pub enum InputFromFileError {
+    ParseCommandError,
+    ParseIntError(ParseIntError),
+    IoError(io::Error),
+}
+
+pub enum Command {
+    Forward,
+    Down,
+    Up
+}
+
+pub struct CommandLine(Command, u32);
+
+fn parse_line(line: &str) -> Result<CommandLine, InputFromFileError> {
+    let parts: Vec<&str> = line.split(' ').collect();
+    let command = match parts[0] {
+        "up" => Ok(Command::Up),
+        "down" => Ok(Command::Down),
+        "forward" => Ok(Command::Forward),
+        _ => Err(InputFromFileError::ParseCommandError)
+    }?;
+    let amount = parts[1].parse().map_err(InputFromFileError::ParseIntError)?;
+    Ok(CommandLine(command, amount))
+}
+
+pub fn input_from_file(filename: &str) -> Result<Vec<CommandLine>, InputFromFileError> {
+    let mut file = File::open(filename).map_err(InputFromFileError::IoError)?;
+
+    let mut contents = String::new();
+    file.read_to_string(&mut contents).map_err(InputFromFileError::IoError)?;
+
+    contents.split_terminator('\n')
+        .map(parse_line)
+        .collect()
+}
+
+pub fn part1(commands: &[CommandLine]) -> u32 {
+    let mut depth = 0;
+    let mut horizontal = 0;
+    for command in commands {
+        match command.0 {
+            Command::Up      => depth -= command.1,
+            Command::Down    => depth += command.1,
+            Command::Forward => horizontal += command.1,
+        }
+    }
+    return depth * horizontal;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part1_example() {
+        let commands = [
+            CommandLine(Command::Forward, 5),
+            CommandLine(Command::Down, 5),
+            CommandLine(Command::Forward, 8),
+            CommandLine(Command::Up, 3),
+            CommandLine(Command::Down, 8),
+            CommandLine(Command::Forward, 2)
+        ];
+        let result = part1(&commands);
+        assert_eq!(result, 150);
+    }
+}
+
diff --git a/src/main.rs b/src/main.rs
index a65299e..f35762e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,12 +1,18 @@
 mod day1;
+mod day2;
 
 fn main() {
-    let input_filename = "input.txt";
-    let input = day1::input_from_file(input_filename)
-        .expect("Failed to read input.txt");
-    let result1 = day1::part1(&input);
-    let result2 = day1::part2(&input);
+    let input_filename = "input2.txt";
+    let input = day2::input_from_file(input_filename)
+        .expect("Failed to read input2.txt");
+
+    // let result1 = day1::part1(&input);
+    // let result2 = day1::part2(&input);
+    
+    let result1 = day2::part1(&input);
+    // let result2 = day2::part2(&input);
+
     println!("Part 1 result: {}", result1);
-    println!("Part 2 result: {}", result2);
+    // println!("Part 2 result: {}", result2);
 }