From 1680aec3ad9b02e4a5dbd266165c0111d39c6f54 Mon Sep 17 00:00:00 2001
From: Alphyron <admin@dragon-labs.de>
Date: Mon, 2 Dec 2019 21:02:53 +0100
Subject: [PATCH] :sparkles: Finish task for part one for day 2

---
 day2/input.txt    |  1 +
 day2/main.go      | 66 +++++++++++++++++++++++++++++++++++++
 day2/main_test.go | 83 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 150 insertions(+)
 create mode 100644 day2/input.txt
 create mode 100644 day2/main.go
 create mode 100644 day2/main_test.go

diff --git a/day2/input.txt b/day2/input.txt
new file mode 100644
index 0000000..04b9352
--- /dev/null
+++ b/day2/input.txt
@@ -0,0 +1 @@
+1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,1,13,19,1,9,19,23,2,13,23,27,2,27,13,31,2,31,10,35,1,6,35,39,1,5,39,43,1,10,43,47,1,5,47,51,1,13,51,55,2,55,9,59,1,6,59,63,1,13,63,67,1,6,67,71,1,71,10,75,2,13,75,79,1,5,79,83,2,83,6,87,1,6,87,91,1,91,13,95,1,95,13,99,2,99,13,103,1,103,5,107,2,107,10,111,1,5,111,115,1,2,115,119,1,119,6,0,99,2,0,14,0
diff --git a/day2/main.go b/day2/main.go
new file mode 100644
index 0000000..740b137
--- /dev/null
+++ b/day2/main.go
@@ -0,0 +1,66 @@
+package main
+
+import (
+	"bufio"
+	"errors"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	file, err := os.Open("input.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	if !scanner.Scan() {
+		log.Fatalln("Problem while read line.")
+		return
+	}
+
+	stringarr := strings.Split(scanner.Text(), ",")
+	var t2 = []int{}
+
+	for _, i := range stringarr {
+		j, err := strconv.Atoi(i)
+		if err != nil {
+			panic(err)
+		}
+		t2 = append(t2, j)
+	}
+	// ========= Finish now, we can solve the task ======
+	t2[1] = 12
+	t2[2] = 2
+	ParseArray(t2)
+
+	log.Println("Part1: " + strconv.Itoa(t2[0]))
+}
+
+func ParseArray(list []int) error {
+	for i := 0; i < len(list); i += 4 {
+		cmd := list[i]
+
+		if cmd == 99 {
+			return nil
+		}
+
+		num1 := list[list[i+1]]
+		num2 := list[list[i+2]]
+		sum := 0
+
+		if cmd == 1 {
+			sum = num1 + num2
+		} else if cmd == 2 {
+			sum = num1 * num2
+		} else {
+			return errors.New("Wrong Command (" + strconv.Itoa(cmd) + ") at position " + strconv.Itoa(i))
+		}
+
+		list[list[i+3]] = sum
+	}
+	return nil
+}
diff --git a/day2/main_test.go b/day2/main_test.go
new file mode 100644
index 0000000..7813c81
--- /dev/null
+++ b/day2/main_test.go
@@ -0,0 +1,83 @@
+package main
+
+import (
+	"strconv"
+	"strings"
+	"testing"
+)
+
+func equalsArray(arr1 []int, arr2 []int) bool {
+	if len(arr1) != len(arr2) {
+		return false
+	}
+
+	for i := 0; i < len(arr1); i++ {
+		if arr1[i] != arr2[i] {
+			return false
+		}
+	}
+	return true
+}
+
+func join(arr []int) string {
+	valuesText := []string{}
+
+	for i := range arr {
+		number := arr[i]
+		text := strconv.Itoa(number)
+		valuesText = append(valuesText, text)
+	}
+	return strings.Join(valuesText, ",")
+}
+
+func TestCalcFuelRecusive1(t *testing.T) {
+	arr := []int{1, 0, 0, 0, 99}
+	err := ParseArray(arr)
+
+	if err != nil {
+		t.Errorf("Error where no error should be: %v", err)
+	}
+	sol := []int{2, 0, 0, 0, 99}
+	if !equalsArray(arr, sol) {
+		t.Errorf("Array was incorrect, got: {%s}, want: {%s}.", join(arr), join(sol))
+	}
+}
+
+func TestCalcFuelRecusive2(t *testing.T) {
+	arr := []int{2, 3, 0, 3, 99}
+	err := ParseArray(arr)
+
+	if err != nil {
+		t.Errorf("Error where no error should be: %v", err)
+	}
+	sol := []int{2, 3, 0, 6, 99}
+	if !equalsArray(arr, sol) {
+		t.Errorf("Array was incorrect, got: {%s}, want: {%s}.", join(arr), join(sol))
+	}
+}
+
+func TestCalcFuelRecusive3(t *testing.T) {
+	arr := []int{2, 4, 4, 5, 99, 0}
+	err := ParseArray(arr)
+
+	if err != nil {
+		t.Errorf("Error where no error should be: %v", err)
+	}
+	sol := []int{2, 4, 4, 5, 99, 9801}
+	if !equalsArray(arr, sol) {
+		t.Errorf("Array was incorrect, got: {%s}, want: {%s}.", join(arr), join(sol))
+	}
+}
+
+func TestCalcFuelRecusive4(t *testing.T) {
+	arr := []int{1, 1, 1, 4, 99, 5, 6, 0, 99}
+	err := ParseArray(arr)
+
+	if err != nil {
+		t.Errorf("Error where no error should be: %v", err)
+	}
+	sol := []int{30, 1, 1, 4, 2, 5, 6, 0, 99}
+	if !equalsArray(arr, sol) {
+		t.Errorf("Array was incorrect, got: {%s}, want: {%s}.", join(arr), join(sol))
+	}
+}