day1

.gitignore

@@ -0,0 +1 @@
+.vscode

client/client.go

@@ -0,0 +1,41 @@
+package client
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+)
+
+type client struct {
+	session string
+}
+
+func NewClient(session string) client {
+	return client{session}
+}
+
+func (c *client) Day(day int) []byte {
+	client := http.Client{}
+	req, err := http.NewRequest("GET", fmt.Sprintf("https://adventofcode.com/2021/day/%v/input", day), nil)
+
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	req.Header.Set("Cookie", fmt.Sprintf("session=%s", c.session))
+	resp, err := client.Do(req)
+
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	return body
+}

d1/d1.go

@@ -0,0 +1,22 @@
+package d1
+
+import (
+	"strconv"
+	"strings"
+)
+
+func D1(scans string) int64 {
+	depths := strings.Split(strings.TrimSpace(scans), "\n")
+	downs := 0
+
+	for i := 1; i < len(depths); i++ {
+		next, _ := strconv.Atoi(strings.TrimSpace(depths[i]))
+		prev, _ := strconv.Atoi(strings.TrimSpace(depths[i-1]))
+
+		if next > prev {
+			downs++
+		}
+	}
+
+	return int64(downs)
+}

d1/d1_test.go

@@ -0,0 +1,25 @@
+package d1
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestD1(t *testing.T) {
+	input := `
+		199
+		200
+		208
+		210
+		200
+		207
+		240
+		269
+		260
+		263
+	`
+	actual := D1(input)
+
+	assert.EqualValues(t, 7, actual)
+}

go.mod

@@ -0,0 +1,10 @@
+module github.com/fotonmoton/aoc2021
+
+go 1.17
+
+require (
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.7.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)

go.sum

@@ -0,0 +1,10 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/fotonmoton/aoc2021/client"
+	"github.com/fotonmoton/aoc2021/d1"
+)
+
+func main() {
+
+	reader := bufio.NewReader(os.Stdin)
+	fmt.Print("Enter your session: ")
+	session, _ := reader.ReadString('\n')
+	client := client.NewClient(strings.TrimSpace(session))
+
+	fmt.Printf("day1: %v\n", d1.D1(string(client.Day(1))))
+}