From 6d016405adc8330817af3f3d0b314c88211ad207 Mon Sep 17 00:00:00 2001
From: Luke Else <mail@luke-else.co.uk>
Date: Thu, 2 Dec 2021 19:34:17 +0000
Subject: [PATCH] day 2b complete

---
 day2/2b/go.mod  |  3 +++
 day2/2b/main.go | 64 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 day2/2b/go.mod
 create mode 100644 day2/2b/main.go

diff --git a/day2/2b/go.mod b/day2/2b/go.mod
new file mode 100644
index 0000000..e938e2e
--- /dev/null
+++ b/day2/2b/go.mod
@@ -0,0 +1,3 @@
+module PWD
+
+go 1.17
diff --git a/day2/2b/main.go b/day2/2b/main.go
new file mode 100644
index 0000000..4b0f524
--- /dev/null
+++ b/day2/2b/main.go
@@ -0,0 +1,64 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	content := returnContent("../input")
+
+	horizontal, depth, _ := followGuidance(content)
+
+	fmt.Println(horizontal * depth)
+
+}
+
+func returnContent(path string) *[]string {
+	//read file and return it as an array of integers
+
+	file, err := os.Open(path)
+	var content []string
+
+	if err != nil {
+		fmt.Println("Unlucky, the file didn't open")
+		return &content
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		content = append(content, scanner.Text())
+	}
+
+	return &content
+}
+
+func followGuidance(content *[]string) (horizontal int, depth int, aim int) {
+
+	for i := 0; i < len(*content); i++ {
+		currentLine := strings.Split((*content)[i], " ")
+
+		value, err := strconv.Atoi(currentLine[1])
+
+		if err != nil {
+			fmt.Println("Uh oh, couldn't find the key! There was an issue with the sonar")
+		}
+
+		switch currentLine[0] {
+		//instructions say that up and down are reversed as we are in the submarine
+		case "up":
+			aim -= value
+		case "down":
+			aim += value
+		default:
+			horizontal += value
+			depth += aim * value
+		}
+	}
+	return
+
+}